1124 lines
62 KiB
C++
1124 lines
62 KiB
C++
// donna_sse.cpp - written and placed in public domain by Jeffrey Walton
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// This is a integration of Andrew Moon's public domain code.
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// Also see https://github.com/floodyberry/curve25519-donna.
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// This is a integration of Andrew Moon's public domain code. The port was
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// clean, but it has one potential problem. The original code is C and relies
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// upon unions. Accessing the inactive union member is undefined behavior in
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// C++. That means copying the array into packedelem8.u is OK; but then using
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// packedelem8.v in a calcualtion is UB. Fortunately most (all?) compilers
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// take pity on C++ developers and compile the code. We will have to keep an
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// eye on things or rewrite significant portions of this code.
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// If needed, see Moon's commit "Go back to ignoring 256th bit [sic]",
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// https://github.com/floodyberry/curve25519-donna/commit/57a683d18721a658
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#include "pch.h"
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#include "config.h"
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#include "donna.h"
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#include "secblock.h"
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#include "misc.h"
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// The data is aligned, but Clang issues warning based on type
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// and not the actual alignment of the variable and data.
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#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
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# pragma GCC diagnostic ignored "-Wcast-align"
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# pragma GCC diagnostic ignored "-Wunused-function"
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#endif
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#if CRYPTOPP_MSC_VERSION
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# pragma warning(disable: 4244)
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#endif
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// Squash MS LNK4221 and libtool warnings
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extern const char DONNA_SSE_FNAME[] = __FILE__;
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#if (CRYPTOPP_CURVE25519_SSE2)
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#include "donna_sse.h"
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ANONYMOUS_NAMESPACE_BEGIN
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using CryptoPP::byte;
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using CryptoPP::word32;
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using CryptoPP::sword32;
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using CryptoPP::word64;
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using CryptoPP::sword64;
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using CryptoPP::GetBlock;
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using CryptoPP::LittleEndian;
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// Bring in all the symbols from the SSE header
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using namespace CryptoPP::Donna::ArchSSE;
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/* Copy a bignum to another: out = in */
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inline void
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curve25519_copy(bignum25519 out, const bignum25519 in) {
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xmmi x0,x1,x2;
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x0 = _mm_load_si128((xmmi*)in + 0);
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x1 = _mm_load_si128((xmmi*)in + 1);
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x2 = _mm_load_si128((xmmi*)in + 2);
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_mm_store_si128((xmmi*)out + 0, x0);
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_mm_store_si128((xmmi*)out + 1, x1);
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_mm_store_si128((xmmi*)out + 2, x2);
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}
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/* Take a little-endian, 32-byte number and expand it into polynomial form */
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inline void
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curve25519_expand(bignum25519 out, const byte in[32]) {
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word32 x0,x1,x2,x3,x4,x5,x6,x7;
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x0 = *(word32 *)(in + 0);
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x1 = *(word32 *)(in + 4);
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x2 = *(word32 *)(in + 8);
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x3 = *(word32 *)(in + 12);
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x4 = *(word32 *)(in + 16);
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x5 = *(word32 *)(in + 20);
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x6 = *(word32 *)(in + 24);
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x7 = *(word32 *)(in + 28);
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out[0] = ( x0 ) & reduce_mask_26;
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out[1] = ((((word64)x1 << 32) | x0) >> 26) & reduce_mask_25;
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out[2] = ((((word64)x2 << 32) | x1) >> 19) & reduce_mask_26;
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out[3] = ((((word64)x3 << 32) | x2) >> 13) & reduce_mask_25;
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out[4] = (( x3) >> 6) & reduce_mask_26;
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out[5] = ( x4 ) & reduce_mask_25;
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out[6] = ((((word64)x5 << 32) | x4) >> 25) & reduce_mask_26;
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out[7] = ((((word64)x6 << 32) | x5) >> 19) & reduce_mask_25;
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out[8] = ((((word64)x7 << 32) | x6) >> 12) & reduce_mask_26;
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out[9] = (( x7) >> 6) & reduce_mask_25; /* ignore the top bit */
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out[10] = 0;
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out[11] = 0;
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}
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/* Take a fully reduced polynomial form number and contract it into a
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* little-endian, 32-byte array
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*/
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inline void
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curve25519_contract(byte out[32], const bignum25519 in) {
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ALIGN(16) bignum25519 f;
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curve25519_copy(f, in);
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#define carry_pass() \
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f[1] += f[0] >> 26; f[0] &= reduce_mask_26; \
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f[2] += f[1] >> 25; f[1] &= reduce_mask_25; \
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f[3] += f[2] >> 26; f[2] &= reduce_mask_26; \
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f[4] += f[3] >> 25; f[3] &= reduce_mask_25; \
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f[5] += f[4] >> 26; f[4] &= reduce_mask_26; \
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f[6] += f[5] >> 25; f[5] &= reduce_mask_25; \
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f[7] += f[6] >> 26; f[6] &= reduce_mask_26; \
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f[8] += f[7] >> 25; f[7] &= reduce_mask_25; \
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f[9] += f[8] >> 26; f[8] &= reduce_mask_26;
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#define carry_pass_full() \
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carry_pass() \
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f[0] += 19 * (f[9] >> 25); f[9] &= reduce_mask_25;
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#define carry_pass_final() \
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carry_pass() \
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f[9] &= reduce_mask_25;
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carry_pass_full()
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carry_pass_full()
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/* now t is between 0 and 2^255-1, properly carried. */
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/* case 1: between 0 and 2^255-20. case 2: between 2^255-19 and 2^255-1. */
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f[0] += 19;
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carry_pass_full()
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/* now between 19 and 2^255-1 in both cases, and offset by 19. */
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f[0] += (1 << 26) - 19;
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f[1] += (1 << 25) - 1;
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f[2] += (1 << 26) - 1;
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f[3] += (1 << 25) - 1;
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f[4] += (1 << 26) - 1;
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f[5] += (1 << 25) - 1;
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f[6] += (1 << 26) - 1;
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f[7] += (1 << 25) - 1;
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f[8] += (1 << 26) - 1;
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f[9] += (1 << 25) - 1;
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/* now between 2^255 and 2^256-20, and offset by 2^255. */
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carry_pass_final()
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#undef carry_pass
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#undef carry_full
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#undef carry_final
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*(word32 *)(out + 0) = ((f[0] ) | (f[1] << 26));
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*(word32 *)(out + 4) = ((f[1] >> 6) | (f[2] << 19));
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*(word32 *)(out + 8) = ((f[2] >> 13) | (f[3] << 13));
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*(word32 *)(out + 12) = ((f[3] >> 19) | (f[4] << 6));
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*(word32 *)(out + 16) = ((f[5] ) | (f[6] << 25));
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*(word32 *)(out + 20) = ((f[6] >> 7) | (f[7] << 19));
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*(word32 *)(out + 24) = ((f[7] >> 13) | (f[8] << 12));
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*(word32 *)(out + 28) = ((f[8] >> 20) | (f[9] << 6));
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}
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/*
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* Maybe swap the contents of two felem arrays (@a and @b), each 5 elements
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* long. Perform the swap iff @swap is non-zero.
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*/
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inline void
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curve25519_swap_conditional(bignum25519 a, bignum25519 b, word32 iswap) {
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const word32 swap = (word32)(-(sword32)iswap);
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xmmi a0,a1,a2,b0,b1,b2,x0,x1,x2;
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xmmi mask = _mm_cvtsi32_si128(swap);
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mask = _mm_shuffle_epi32(mask, 0);
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a0 = _mm_load_si128((xmmi *)a + 0);
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a1 = _mm_load_si128((xmmi *)a + 1);
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a2 = _mm_load_si128((xmmi *)a + 2);
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b0 = _mm_load_si128((xmmi *)b + 0);
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b1 = _mm_load_si128((xmmi *)b + 1);
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b2 = _mm_load_si128((xmmi *)b + 2);
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b0 = _mm_xor_si128(a0, b0);
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b1 = _mm_xor_si128(a1, b1);
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b2 = _mm_xor_si128(a2, b2);
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x0 = _mm_and_si128(b0, mask);
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x1 = _mm_and_si128(b1, mask);
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x2 = _mm_and_si128(b2, mask);
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x0 = _mm_xor_si128(x0, a0);
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x1 = _mm_xor_si128(x1, a1);
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x2 = _mm_xor_si128(x2, a2);
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a0 = _mm_xor_si128(x0, b0);
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a1 = _mm_xor_si128(x1, b1);
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a2 = _mm_xor_si128(x2, b2);
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_mm_store_si128((xmmi *)a + 0, x0);
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_mm_store_si128((xmmi *)a + 1, x1);
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_mm_store_si128((xmmi *)a + 2, x2);
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_mm_store_si128((xmmi *)b + 0, a0);
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_mm_store_si128((xmmi *)b + 1, a1);
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_mm_store_si128((xmmi *)b + 2, a2);
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}
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/* interleave two bignums */
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inline void
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curve25519_tangle32(packedelem32 *out, const bignum25519 x, const bignum25519 z) {
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xmmi x0,x1,x2,z0,z1,z2;
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x0 = _mm_load_si128((xmmi *)(x + 0));
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x1 = _mm_load_si128((xmmi *)(x + 4));
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x2 = _mm_load_si128((xmmi *)(x + 8));
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z0 = _mm_load_si128((xmmi *)(z + 0));
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z1 = _mm_load_si128((xmmi *)(z + 4));
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z2 = _mm_load_si128((xmmi *)(z + 8));
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out[0].v = _mm_unpacklo_epi32(x0, z0);
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out[1].v = _mm_unpackhi_epi32(x0, z0);
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out[2].v = _mm_unpacklo_epi32(x1, z1);
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out[3].v = _mm_unpackhi_epi32(x1, z1);
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out[4].v = _mm_unpacklo_epi32(x2, z2);
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}
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/* split a packed bignum in to it's two parts */
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inline void
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curve25519_untangle64(bignum25519 x, bignum25519 z, const packedelem64 *in) {
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_mm_store_si128((xmmi *)(x + 0), _mm_unpacklo_epi64(_mm_unpacklo_epi32(in[0].v, in[1].v), _mm_unpacklo_epi32(in[2].v, in[3].v)));
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_mm_store_si128((xmmi *)(x + 4), _mm_unpacklo_epi64(_mm_unpacklo_epi32(in[4].v, in[5].v), _mm_unpacklo_epi32(in[6].v, in[7].v)));
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_mm_store_si128((xmmi *)(x + 8), _mm_unpacklo_epi32(in[8].v, in[9].v) );
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_mm_store_si128((xmmi *)(z + 0), _mm_unpacklo_epi64(_mm_unpackhi_epi32(in[0].v, in[1].v), _mm_unpackhi_epi32(in[2].v, in[3].v)));
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_mm_store_si128((xmmi *)(z + 4), _mm_unpacklo_epi64(_mm_unpackhi_epi32(in[4].v, in[5].v), _mm_unpackhi_epi32(in[6].v, in[7].v)));
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_mm_store_si128((xmmi *)(z + 8), _mm_unpackhi_epi32(in[8].v, in[9].v) );
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}
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/* add two packed bignums */
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inline void
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curve25519_add_packed32(packedelem32 *out, const packedelem32 *r, const packedelem32 *s) {
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out[0].v = _mm_add_epi32(r[0].v, s[0].v);
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out[1].v = _mm_add_epi32(r[1].v, s[1].v);
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out[2].v = _mm_add_epi32(r[2].v, s[2].v);
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out[3].v = _mm_add_epi32(r[3].v, s[3].v);
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out[4].v = _mm_add_epi32(r[4].v, s[4].v);
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}
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/* subtract two packed bignums */
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inline void
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curve25519_sub_packed32(packedelem32 *out, const packedelem32 *r, const packedelem32 *s) {
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xmmi r0,r1,r2,r3,r4;
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xmmi s0,s1,s2,s3;
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xmmi c1,c2;
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r0 = _mm_add_epi32(r[0].v, packed32zeromodp0.v);
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r1 = _mm_add_epi32(r[1].v, packed32zeromodp1.v);
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r2 = _mm_add_epi32(r[2].v, packed32zeromodp1.v);
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r3 = _mm_add_epi32(r[3].v, packed32zeromodp1.v);
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r4 = _mm_add_epi32(r[4].v, packed32zeromodp1.v);
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r0 = _mm_sub_epi32(r0, s[0].v); /* 00 11 */
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r1 = _mm_sub_epi32(r1, s[1].v); /* 22 33 */
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r2 = _mm_sub_epi32(r2, s[2].v); /* 44 55 */
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r3 = _mm_sub_epi32(r3, s[3].v); /* 66 77 */
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r4 = _mm_sub_epi32(r4, s[4].v); /* 88 99 */
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s0 = _mm_unpacklo_epi64(r0, r2); /* 00 44 */
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s1 = _mm_unpackhi_epi64(r0, r2); /* 11 55 */
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s2 = _mm_unpacklo_epi64(r1, r3); /* 22 66 */
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s3 = _mm_unpackhi_epi64(r1, r3); /* 33 77 */
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c1 = _mm_srli_epi32(s0, 26); c2 = _mm_srli_epi32(s2, 26); s0 = _mm_and_si128(s0, packedmask26262626.v); s2 = _mm_and_si128(s2, packedmask26262626.v); s1 = _mm_add_epi32(s1, c1); s3 = _mm_add_epi32(s3, c2);
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c1 = _mm_srli_epi32(s1, 25); c2 = _mm_srli_epi32(s3, 25); s1 = _mm_and_si128(s1, packedmask25252525.v); s3 = _mm_and_si128(s3, packedmask25252525.v); s2 = _mm_add_epi32(s2, c1); r4 = _mm_add_epi32(r4, _mm_srli_si128(c2, 8)); s0 = _mm_add_epi32(s0, _mm_slli_si128(c2, 8));
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out[0].v = _mm_unpacklo_epi64(s0, s1); /* 00 11 */
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out[1].v = _mm_unpacklo_epi64(s2, s3); /* 22 33 */
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out[2].v = _mm_unpackhi_epi64(s0, s1); /* 44 55 */
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out[3].v = _mm_unpackhi_epi64(s2, s3); /* 66 77 */
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out[4].v = r4; /* 88 99 */
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}
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/* multiply two packed bignums */
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inline void
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curve25519_mul_packed64(packedelem64 *out, const packedelem64 *r, const packedelem64 *s) {
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xmmi r1,r2,r3,r4,r5,r6,r7,r8,r9;
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xmmi r1_2,r3_2,r5_2,r7_2,r9_2;
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xmmi c1,c2;
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out[0].v = _mm_mul_epu32(r[0].v, s[0].v);
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out[1].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[1].v), _mm_mul_epu32(r[1].v, s[0].v));
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r1_2 = _mm_slli_epi32(r[1].v, 1);
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out[2].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r1_2 , s[1].v), _mm_mul_epu32(r[2].v, s[0].v)));
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out[3].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[3].v), _mm_add_epi64(_mm_mul_epu32(r[1].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[1].v), _mm_mul_epu32(r[3].v, s[0].v))));
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r3_2 = _mm_slli_epi32(r[3].v, 1);
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out[4].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r1_2 , s[3].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r3_2 , s[1].v), _mm_mul_epu32(r[4].v, s[0].v)))));
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out[5].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[5].v), _mm_add_epi64(_mm_mul_epu32(r[1].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[3].v), _mm_add_epi64(_mm_mul_epu32(r[3].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r[4].v, s[1].v), _mm_mul_epu32(r[5].v, s[0].v))))));
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r5_2 = _mm_slli_epi32(r[5].v, 1);
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out[6].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[6].v), _mm_add_epi64(_mm_mul_epu32(r1_2 , s[5].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r3_2 , s[3].v), _mm_add_epi64(_mm_mul_epu32(r[4].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r5_2 , s[1].v), _mm_mul_epu32(r[6].v, s[0].v)))))));
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out[7].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[7].v), _mm_add_epi64(_mm_mul_epu32(r[1].v, s[6].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[5].v), _mm_add_epi64(_mm_mul_epu32(r[3].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r[4].v, s[3].v), _mm_add_epi64(_mm_mul_epu32(r[5].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r[6].v, s[1].v), _mm_mul_epu32(r[7].v , s[0].v))))))));
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r7_2 = _mm_slli_epi32(r[7].v, 1);
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out[8].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[8].v), _mm_add_epi64(_mm_mul_epu32(r1_2 , s[7].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[6].v), _mm_add_epi64(_mm_mul_epu32(r3_2 , s[5].v), _mm_add_epi64(_mm_mul_epu32(r[4].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r5_2 , s[3].v), _mm_add_epi64(_mm_mul_epu32(r[6].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r7_2 , s[1].v), _mm_mul_epu32(r[8].v, s[0].v)))))))));
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out[9].v = _mm_add_epi64(_mm_mul_epu32(r[0].v, s[9].v), _mm_add_epi64(_mm_mul_epu32(r[1].v, s[8].v), _mm_add_epi64(_mm_mul_epu32(r[2].v, s[7].v), _mm_add_epi64(_mm_mul_epu32(r[3].v, s[6].v), _mm_add_epi64(_mm_mul_epu32(r[4].v, s[5].v), _mm_add_epi64(_mm_mul_epu32(r[5].v, s[4].v), _mm_add_epi64(_mm_mul_epu32(r[6].v, s[3].v), _mm_add_epi64(_mm_mul_epu32(r[7].v, s[2].v), _mm_add_epi64(_mm_mul_epu32(r[8].v, s[1].v), _mm_mul_epu32(r[9].v, s[0].v))))))))));
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r1 = _mm_mul_epu32(r[1].v, packednineteen.v);
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r2 = _mm_mul_epu32(r[2].v, packednineteen.v);
|
|
r1_2 = _mm_slli_epi32(r1, 1);
|
|
r3 = _mm_mul_epu32(r[3].v, packednineteen.v);
|
|
r4 = _mm_mul_epu32(r[4].v, packednineteen.v);
|
|
r3_2 = _mm_slli_epi32(r3, 1);
|
|
r5 = _mm_mul_epu32(r[5].v, packednineteen.v);
|
|
r6 = _mm_mul_epu32(r[6].v, packednineteen.v);
|
|
r5_2 = _mm_slli_epi32(r5, 1);
|
|
r7 = _mm_mul_epu32(r[7].v, packednineteen.v);
|
|
r8 = _mm_mul_epu32(r[8].v, packednineteen.v);
|
|
r7_2 = _mm_slli_epi32(r7, 1);
|
|
r9 = _mm_mul_epu32(r[9].v, packednineteen.v);
|
|
r9_2 = _mm_slli_epi32(r9, 1);
|
|
|
|
out[0].v = _mm_add_epi64(out[0].v, _mm_add_epi64(_mm_mul_epu32(r9_2, s[1].v), _mm_add_epi64(_mm_mul_epu32(r8, s[2].v), _mm_add_epi64(_mm_mul_epu32(r7_2, s[3].v), _mm_add_epi64(_mm_mul_epu32(r6, s[4].v), _mm_add_epi64(_mm_mul_epu32(r5_2, s[5].v), _mm_add_epi64(_mm_mul_epu32(r4, s[6].v), _mm_add_epi64(_mm_mul_epu32(r3_2, s[7].v), _mm_add_epi64(_mm_mul_epu32(r2, s[8].v), _mm_mul_epu32(r1_2, s[9].v))))))))));
|
|
out[1].v = _mm_add_epi64(out[1].v, _mm_add_epi64(_mm_mul_epu32(r9 , s[2].v), _mm_add_epi64(_mm_mul_epu32(r8, s[3].v), _mm_add_epi64(_mm_mul_epu32(r7 , s[4].v), _mm_add_epi64(_mm_mul_epu32(r6, s[5].v), _mm_add_epi64(_mm_mul_epu32(r5 , s[6].v), _mm_add_epi64(_mm_mul_epu32(r4, s[7].v), _mm_add_epi64(_mm_mul_epu32(r3 , s[8].v), _mm_mul_epu32(r2, s[9].v)))))))));
|
|
out[2].v = _mm_add_epi64(out[2].v, _mm_add_epi64(_mm_mul_epu32(r9_2, s[3].v), _mm_add_epi64(_mm_mul_epu32(r8, s[4].v), _mm_add_epi64(_mm_mul_epu32(r7_2, s[5].v), _mm_add_epi64(_mm_mul_epu32(r6, s[6].v), _mm_add_epi64(_mm_mul_epu32(r5_2, s[7].v), _mm_add_epi64(_mm_mul_epu32(r4, s[8].v), _mm_mul_epu32(r3_2, s[9].v))))))));
|
|
out[3].v = _mm_add_epi64(out[3].v, _mm_add_epi64(_mm_mul_epu32(r9 , s[4].v), _mm_add_epi64(_mm_mul_epu32(r8, s[5].v), _mm_add_epi64(_mm_mul_epu32(r7 , s[6].v), _mm_add_epi64(_mm_mul_epu32(r6, s[7].v), _mm_add_epi64(_mm_mul_epu32(r5 , s[8].v), _mm_mul_epu32(r4, s[9].v)))))));
|
|
out[4].v = _mm_add_epi64(out[4].v, _mm_add_epi64(_mm_mul_epu32(r9_2, s[5].v), _mm_add_epi64(_mm_mul_epu32(r8, s[6].v), _mm_add_epi64(_mm_mul_epu32(r7_2, s[7].v), _mm_add_epi64(_mm_mul_epu32(r6, s[8].v), _mm_mul_epu32(r5_2, s[9].v))))));
|
|
out[5].v = _mm_add_epi64(out[5].v, _mm_add_epi64(_mm_mul_epu32(r9 , s[6].v), _mm_add_epi64(_mm_mul_epu32(r8, s[7].v), _mm_add_epi64(_mm_mul_epu32(r7 , s[8].v), _mm_mul_epu32(r6, s[9].v)))));
|
|
out[6].v = _mm_add_epi64(out[6].v, _mm_add_epi64(_mm_mul_epu32(r9_2, s[7].v), _mm_add_epi64(_mm_mul_epu32(r8, s[8].v), _mm_mul_epu32(r7_2, s[9].v))));
|
|
out[7].v = _mm_add_epi64(out[7].v, _mm_add_epi64(_mm_mul_epu32(r9 , s[8].v), _mm_mul_epu32(r8, s[9].v)));
|
|
out[8].v = _mm_add_epi64(out[8].v, _mm_mul_epu32(r9_2, s[9].v));
|
|
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
c1 = _mm_srli_epi64(out[1].v, 25); c2 = _mm_srli_epi64(out[5].v, 25); out[1].v = _mm_and_si128(out[1].v, packedmask25.v); out[5].v = _mm_and_si128(out[5].v, packedmask25.v); out[2].v = _mm_add_epi64(out[2].v, c1); out[6].v = _mm_add_epi64(out[6].v, c2);
|
|
c1 = _mm_srli_epi64(out[2].v, 26); c2 = _mm_srli_epi64(out[6].v, 26); out[2].v = _mm_and_si128(out[2].v, packedmask26.v); out[6].v = _mm_and_si128(out[6].v, packedmask26.v); out[3].v = _mm_add_epi64(out[3].v, c1); out[7].v = _mm_add_epi64(out[7].v, c2);
|
|
c1 = _mm_srli_epi64(out[3].v, 25); c2 = _mm_srli_epi64(out[7].v, 25); out[3].v = _mm_and_si128(out[3].v, packedmask25.v); out[7].v = _mm_and_si128(out[7].v, packedmask25.v); out[4].v = _mm_add_epi64(out[4].v, c1); out[8].v = _mm_add_epi64(out[8].v, c2);
|
|
c2 = _mm_srli_epi64(out[8].v, 26); out[8].v = _mm_and_si128(out[8].v, packedmask26.v); out[9].v = _mm_add_epi64(out[9].v, c2);
|
|
c2 = _mm_srli_epi64(out[9].v, 25); out[9].v = _mm_and_si128(out[9].v, packedmask25.v); out[0].v = _mm_add_epi64(out[0].v, _mm_mul_epu32(c2, packednineteen.v));
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
}
|
|
|
|
/* multiply a bignum */
|
|
void
|
|
curve25519_mul(bignum25519 out, const bignum25519 r, const bignum25519 s) {
|
|
xmmi m01,m23,m45,m67,m89;
|
|
xmmi m0123,m4567;
|
|
xmmi s0123,s4567;
|
|
xmmi s01,s23,s45,s67,s89;
|
|
xmmi s12,s34,s56,s78,s9;
|
|
xmmi r0,r2,r4,r6,r8;
|
|
xmmi r1,r3,r5,r7,r9;
|
|
xmmi r119,r219,r319,r419,r519,r619,r719,r819,r919;
|
|
xmmi c1,c2,c3;
|
|
|
|
s0123 = _mm_load_si128((xmmi*)s + 0);
|
|
s01 = _mm_shuffle_epi32(s0123,_MM_SHUFFLE(3,1,2,0));
|
|
s12 = _mm_shuffle_epi32(s0123, _MM_SHUFFLE(2,2,1,1));
|
|
s23 = _mm_shuffle_epi32(s0123,_MM_SHUFFLE(3,3,2,2));
|
|
s4567 = _mm_load_si128((xmmi*)s + 1);
|
|
s34 = _mm_unpacklo_epi64(_mm_srli_si128(s0123,12),s4567);
|
|
s45 = _mm_shuffle_epi32(s4567,_MM_SHUFFLE(3,1,2,0));
|
|
s56 = _mm_shuffle_epi32(s4567, _MM_SHUFFLE(2,2,1,1));
|
|
s67 = _mm_shuffle_epi32(s4567,_MM_SHUFFLE(3,3,2,2));
|
|
s89 = _mm_load_si128((xmmi*)s + 2);
|
|
s78 = _mm_unpacklo_epi64(_mm_srli_si128(s4567,12),s89);
|
|
s89 = _mm_shuffle_epi32(s89,_MM_SHUFFLE(3,1,2,0));
|
|
s9 = _mm_shuffle_epi32(s89, _MM_SHUFFLE(3,3,2,2));
|
|
|
|
r0 = _mm_load_si128((xmmi*)r + 0);
|
|
r1 = _mm_shuffle_epi32(r0, _MM_SHUFFLE(1,1,1,1));
|
|
r1 = _mm_add_epi64(r1, _mm_and_si128(r1, sse2_top64bitmask.v));
|
|
r2 = _mm_shuffle_epi32(r0, _MM_SHUFFLE(2,2,2,2));
|
|
r3 = _mm_shuffle_epi32(r0, _MM_SHUFFLE(3,3,3,3));
|
|
r3 = _mm_add_epi64(r3, _mm_and_si128(r3, sse2_top64bitmask.v));
|
|
r0 = _mm_shuffle_epi32(r0, _MM_SHUFFLE(0,0,0,0));
|
|
r4 = _mm_load_si128((xmmi*)r + 1);
|
|
r5 = _mm_shuffle_epi32(r4, _MM_SHUFFLE(1,1,1,1));
|
|
r5 = _mm_add_epi64(r5, _mm_and_si128(r5, sse2_top64bitmask.v));
|
|
r6 = _mm_shuffle_epi32(r4, _MM_SHUFFLE(2,2,2,2));
|
|
r7 = _mm_shuffle_epi32(r4, _MM_SHUFFLE(3,3,3,3));
|
|
r7 = _mm_add_epi64(r7, _mm_and_si128(r7, sse2_top64bitmask.v));
|
|
r4 = _mm_shuffle_epi32(r4, _MM_SHUFFLE(0,0,0,0));
|
|
r8 = _mm_load_si128((xmmi*)r + 2);
|
|
r9 = _mm_shuffle_epi32(r8, _MM_SHUFFLE(3,1,3,1));
|
|
r9 = _mm_add_epi64(r9, _mm_and_si128(r9, sse2_top64bitmask.v));
|
|
r8 = _mm_shuffle_epi32(r8, _MM_SHUFFLE(3,0,3,0));
|
|
|
|
m01 = _mm_mul_epu32(r1,s01);
|
|
m23 = _mm_mul_epu32(r1,s23);
|
|
m45 = _mm_mul_epu32(r1,s45);
|
|
m67 = _mm_mul_epu32(r1,s67);
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r3,s01));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r3,s23));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r3,s45));
|
|
m89 = _mm_mul_epu32(r1,s89);
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r5,s01));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r5,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r3,s67));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r7,s01));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r5,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r7,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r9,s01));
|
|
|
|
/* shift up */
|
|
m89 = _mm_unpackhi_epi64(m67,_mm_slli_si128(m89,8));
|
|
m67 = _mm_unpackhi_epi64(m45,_mm_slli_si128(m67,8));
|
|
m45 = _mm_unpackhi_epi64(m23,_mm_slli_si128(m45,8));
|
|
m23 = _mm_unpackhi_epi64(m01,_mm_slli_si128(m23,8));
|
|
m01 = _mm_unpackhi_epi64(_mm_setzero_si128(),_mm_slli_si128(m01,8));
|
|
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r0,s01));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r0,s23));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r0,s45));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r0,s67));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r2,s01));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r2,s23));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r4,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r0,s89));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r4,s01));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r2,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r2,s67));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r6,s01));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r4,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r6,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r8,s01));
|
|
|
|
r219 = _mm_mul_epu32(r2, packednineteen.v);
|
|
r419 = _mm_mul_epu32(r4, packednineteen.v);
|
|
r619 = _mm_mul_epu32(r6, packednineteen.v);
|
|
r819 = _mm_mul_epu32(r8, packednineteen.v);
|
|
r119 = _mm_shuffle_epi32(r1,_MM_SHUFFLE(0,0,2,2)); r119 = _mm_mul_epu32(r119, packednineteen.v);
|
|
r319 = _mm_shuffle_epi32(r3,_MM_SHUFFLE(0,0,2,2)); r319 = _mm_mul_epu32(r319, packednineteen.v);
|
|
r519 = _mm_shuffle_epi32(r5,_MM_SHUFFLE(0,0,2,2)); r519 = _mm_mul_epu32(r519, packednineteen.v);
|
|
r719 = _mm_shuffle_epi32(r7,_MM_SHUFFLE(0,0,2,2)); r719 = _mm_mul_epu32(r719, packednineteen.v);
|
|
r919 = _mm_shuffle_epi32(r9,_MM_SHUFFLE(0,0,2,2)); r919 = _mm_mul_epu32(r919, packednineteen.v);
|
|
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r919,s12));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r919,s34));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r919,s56));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r919,s78));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r719,s34));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r719,s56));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r719,s78));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r719,s9));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r519,s56));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r519,s78));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r519,s9));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r819,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r319,s78));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r319,s9));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r619,s89));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r919,s9));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r819,s23));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r819,s45));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r819,s67));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r619,s45));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r619,s67));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r419,s67));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r419,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r219,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r119,s9));
|
|
|
|
r0 = _mm_unpacklo_epi64(m01, m45);
|
|
r1 = _mm_unpackhi_epi64(m01, m45);
|
|
r2 = _mm_unpacklo_epi64(m23, m67);
|
|
r3 = _mm_unpackhi_epi64(m23, m67);
|
|
r4 = _mm_unpacklo_epi64(m89, m89);
|
|
r5 = _mm_unpackhi_epi64(m89, m89);
|
|
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
c1 = _mm_srli_epi64(r1, 25); c2 = _mm_srli_epi64(r3, 25); r1 = _mm_and_si128(r1, packedmask25.v); r3 = _mm_and_si128(r3, packedmask25.v); r2 = _mm_add_epi64(r2, c1); r4 = _mm_add_epi64(r4, c2); c3 = _mm_slli_si128(c2, 8);
|
|
c1 = _mm_srli_epi64(r4, 26); r4 = _mm_and_si128(r4, packedmask26.v); r5 = _mm_add_epi64(r5, c1);
|
|
c1 = _mm_srli_epi64(r5, 25); r5 = _mm_and_si128(r5, packedmask25.v); r0 = _mm_add_epi64(r0, _mm_unpackhi_epi64(_mm_mul_epu32(c1, packednineteen.v), c3));
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
|
|
m0123 = _mm_unpacklo_epi32(r0, r1);
|
|
m4567 = _mm_unpackhi_epi32(r0, r1);
|
|
m0123 = _mm_unpacklo_epi64(m0123, _mm_unpacklo_epi32(r2, r3));
|
|
m4567 = _mm_unpacklo_epi64(m4567, _mm_unpackhi_epi32(r2, r3));
|
|
m89 = _mm_unpackhi_epi32(r4, r5);
|
|
|
|
_mm_store_si128((xmmi*)out + 0, m0123);
|
|
_mm_store_si128((xmmi*)out + 1, m4567);
|
|
_mm_store_si128((xmmi*)out + 2, m89);
|
|
}
|
|
|
|
typedef struct bignum25519mulprecomp_t {
|
|
xmmi r0,r2,r4,r6,r8;
|
|
xmmi r1,r3,r5,r7,r9;
|
|
xmmi r119,r219,r319,r419,r519,r619,r719,r819,r919;
|
|
} bignum25519mulprecomp;
|
|
|
|
/* precompute a constant to multiply by */
|
|
inline void
|
|
curve25519_mul_precompute(bignum25519mulprecomp *pre, const bignum25519 r) {
|
|
pre->r0 = _mm_load_si128((xmmi*)r + 0);
|
|
pre->r1 = _mm_shuffle_epi32(pre->r0, _MM_SHUFFLE(1,1,1,1));
|
|
pre->r1 = _mm_add_epi64(pre->r1, _mm_and_si128(pre->r1, sse2_top64bitmask.v));
|
|
pre->r2 = _mm_shuffle_epi32(pre->r0, _MM_SHUFFLE(2,2,2,2));
|
|
pre->r3 = _mm_shuffle_epi32(pre->r0, _MM_SHUFFLE(3,3,3,3));
|
|
pre->r3 = _mm_add_epi64(pre->r3, _mm_and_si128(pre->r3, sse2_top64bitmask.v));
|
|
pre->r0 = _mm_shuffle_epi32(pre->r0, _MM_SHUFFLE(0,0,0,0));
|
|
pre->r4 = _mm_load_si128((xmmi*)r + 1);
|
|
pre->r5 = _mm_shuffle_epi32(pre->r4, _MM_SHUFFLE(1,1,1,1));
|
|
pre->r5 = _mm_add_epi64(pre->r5, _mm_and_si128(pre->r5, sse2_top64bitmask.v));
|
|
pre->r6 = _mm_shuffle_epi32(pre->r4, _MM_SHUFFLE(2,2,2,2));
|
|
pre->r7 = _mm_shuffle_epi32(pre->r4, _MM_SHUFFLE(3,3,3,3));
|
|
pre->r7 = _mm_add_epi64(pre->r7, _mm_and_si128(pre->r7, sse2_top64bitmask.v));
|
|
pre->r4 = _mm_shuffle_epi32(pre->r4, _MM_SHUFFLE(0,0,0,0));
|
|
pre->r8 = _mm_load_si128((xmmi*)r + 2);
|
|
pre->r9 = _mm_shuffle_epi32(pre->r8, _MM_SHUFFLE(3,1,3,1));
|
|
pre->r9 = _mm_add_epi64(pre->r9, _mm_and_si128(pre->r9, sse2_top64bitmask.v));
|
|
pre->r8 = _mm_shuffle_epi32(pre->r8, _MM_SHUFFLE(3,0,3,0));
|
|
|
|
pre->r219 = _mm_mul_epu32(pre->r2, packednineteen.v);
|
|
pre->r419 = _mm_mul_epu32(pre->r4, packednineteen.v);
|
|
pre->r619 = _mm_mul_epu32(pre->r6, packednineteen.v);
|
|
pre->r819 = _mm_mul_epu32(pre->r8, packednineteen.v);
|
|
pre->r119 = _mm_shuffle_epi32(pre->r1,_MM_SHUFFLE(0,0,2,2)); pre->r119 = _mm_mul_epu32(pre->r119, packednineteen.v);
|
|
pre->r319 = _mm_shuffle_epi32(pre->r3,_MM_SHUFFLE(0,0,2,2)); pre->r319 = _mm_mul_epu32(pre->r319, packednineteen.v);
|
|
pre->r519 = _mm_shuffle_epi32(pre->r5,_MM_SHUFFLE(0,0,2,2)); pre->r519 = _mm_mul_epu32(pre->r519, packednineteen.v);
|
|
pre->r719 = _mm_shuffle_epi32(pre->r7,_MM_SHUFFLE(0,0,2,2)); pre->r719 = _mm_mul_epu32(pre->r719, packednineteen.v);
|
|
pre->r919 = _mm_shuffle_epi32(pre->r9,_MM_SHUFFLE(0,0,2,2)); pre->r919 = _mm_mul_epu32(pre->r919, packednineteen.v);
|
|
}
|
|
|
|
|
|
/* multiply a bignum by a pre-computed constant */
|
|
inline void
|
|
curve25519_mul_precomputed(bignum25519 out, const bignum25519 s, const bignum25519mulprecomp *r) {
|
|
xmmi m01,m23,m45,m67,m89;
|
|
xmmi m0123,m4567;
|
|
xmmi s0123,s4567;
|
|
xmmi s01,s23,s45,s67,s89;
|
|
xmmi s12,s34,s56,s78,s9;
|
|
xmmi r0,r1,r2,r3,r4,r5;
|
|
xmmi c1,c2,c3;
|
|
|
|
s0123 = _mm_load_si128((xmmi*)s + 0);
|
|
s01 = _mm_shuffle_epi32(s0123,_MM_SHUFFLE(3,1,2,0));
|
|
s12 = _mm_shuffle_epi32(s0123, _MM_SHUFFLE(2,2,1,1));
|
|
s23 = _mm_shuffle_epi32(s0123,_MM_SHUFFLE(3,3,2,2));
|
|
s4567 = _mm_load_si128((xmmi*)s + 1);
|
|
s34 = _mm_unpacklo_epi64(_mm_srli_si128(s0123,12),s4567);
|
|
s45 = _mm_shuffle_epi32(s4567,_MM_SHUFFLE(3,1,2,0));
|
|
s56 = _mm_shuffle_epi32(s4567, _MM_SHUFFLE(2,2,1,1));
|
|
s67 = _mm_shuffle_epi32(s4567,_MM_SHUFFLE(3,3,2,2));
|
|
s89 = _mm_load_si128((xmmi*)s + 2);
|
|
s78 = _mm_unpacklo_epi64(_mm_srli_si128(s4567,12),s89);
|
|
s89 = _mm_shuffle_epi32(s89,_MM_SHUFFLE(3,1,2,0));
|
|
s9 = _mm_shuffle_epi32(s89, _MM_SHUFFLE(3,3,2,2));
|
|
|
|
m01 = _mm_mul_epu32(r->r1,s01);
|
|
m23 = _mm_mul_epu32(r->r1,s23);
|
|
m45 = _mm_mul_epu32(r->r1,s45);
|
|
m67 = _mm_mul_epu32(r->r1,s67);
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r3,s01));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r3,s23));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r3,s45));
|
|
m89 = _mm_mul_epu32(r->r1,s89);
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r5,s01));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r5,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r3,s67));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r7,s01));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r5,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r7,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r9,s01));
|
|
|
|
/* shift up */
|
|
m89 = _mm_unpackhi_epi64(m67,_mm_slli_si128(m89,8));
|
|
m67 = _mm_unpackhi_epi64(m45,_mm_slli_si128(m67,8));
|
|
m45 = _mm_unpackhi_epi64(m23,_mm_slli_si128(m45,8));
|
|
m23 = _mm_unpackhi_epi64(m01,_mm_slli_si128(m23,8));
|
|
m01 = _mm_unpackhi_epi64(_mm_setzero_si128(),_mm_slli_si128(m01,8));
|
|
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r0,s01));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r0,s23));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r0,s45));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r0,s67));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r2,s01));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r2,s23));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r4,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r0,s89));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r4,s01));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r2,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r2,s67));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r6,s01));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r4,s45));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r6,s23));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r8,s01));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r919,s12));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r919,s34));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r919,s56));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r919,s78));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r719,s34));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r719,s56));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r719,s78));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r719,s9));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r519,s56));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r519,s78));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r519,s9));
|
|
m67 = _mm_add_epi64(m67,_mm_mul_epu32(r->r819,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r319,s78));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r319,s9));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r619,s89));
|
|
m89 = _mm_add_epi64(m89,_mm_mul_epu32(r->r919,s9));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r819,s23));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r819,s45));
|
|
m45 = _mm_add_epi64(m45,_mm_mul_epu32(r->r819,s67));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r619,s45));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r619,s67));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r419,s67));
|
|
m23 = _mm_add_epi64(m23,_mm_mul_epu32(r->r419,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r219,s89));
|
|
m01 = _mm_add_epi64(m01,_mm_mul_epu32(r->r119,s9));
|
|
|
|
r0 = _mm_unpacklo_epi64(m01, m45);
|
|
r1 = _mm_unpackhi_epi64(m01, m45);
|
|
r2 = _mm_unpacklo_epi64(m23, m67);
|
|
r3 = _mm_unpackhi_epi64(m23, m67);
|
|
r4 = _mm_unpacklo_epi64(m89, m89);
|
|
r5 = _mm_unpackhi_epi64(m89, m89);
|
|
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
c1 = _mm_srli_epi64(r1, 25); c2 = _mm_srli_epi64(r3, 25); r1 = _mm_and_si128(r1, packedmask25.v); r3 = _mm_and_si128(r3, packedmask25.v); r2 = _mm_add_epi64(r2, c1); r4 = _mm_add_epi64(r4, c2); c3 = _mm_slli_si128(c2, 8);
|
|
c1 = _mm_srli_epi64(r4, 26); r4 = _mm_and_si128(r4, packedmask26.v); r5 = _mm_add_epi64(r5, c1);
|
|
c1 = _mm_srli_epi64(r5, 25); r5 = _mm_and_si128(r5, packedmask25.v); r0 = _mm_add_epi64(r0, _mm_unpackhi_epi64(_mm_mul_epu32(c1, packednineteen.v), c3));
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
|
|
m0123 = _mm_unpacklo_epi32(r0, r1);
|
|
m4567 = _mm_unpackhi_epi32(r0, r1);
|
|
m0123 = _mm_unpacklo_epi64(m0123, _mm_unpacklo_epi32(r2, r3));
|
|
m4567 = _mm_unpacklo_epi64(m4567, _mm_unpackhi_epi32(r2, r3));
|
|
m89 = _mm_unpackhi_epi32(r4, r5);
|
|
|
|
_mm_store_si128((xmmi*)out + 0, m0123);
|
|
_mm_store_si128((xmmi*)out + 1, m4567);
|
|
_mm_store_si128((xmmi*)out + 2, m89);
|
|
}
|
|
|
|
/* square a bignum 'count' times */
|
|
#define curve25519_square(r,x) curve25519_square_times(r,x,1)
|
|
|
|
void
|
|
curve25519_square_times(bignum25519 r, const bignum25519 in, int count) {
|
|
xmmi m01,m23,m45,m67,m89;
|
|
xmmi r0,r1,r2,r3,r4,r5,r6,r7,r8,r9;
|
|
xmmi r0a,r1a,r2a,r3a,r7a,r9a;
|
|
xmmi r0123,r4567;
|
|
xmmi r01,r23,r45,r67,r6x,r89,r8x;
|
|
xmmi r12,r34,r56,r78,r9x;
|
|
xmmi r5619;
|
|
xmmi c1,c2,c3;
|
|
|
|
r0123 = _mm_load_si128((xmmi*)in + 0);
|
|
r01 = _mm_shuffle_epi32(r0123,_MM_SHUFFLE(3,1,2,0));
|
|
r23 = _mm_shuffle_epi32(r0123,_MM_SHUFFLE(3,3,2,2));
|
|
r4567 = _mm_load_si128((xmmi*)in + 1);
|
|
r45 = _mm_shuffle_epi32(r4567,_MM_SHUFFLE(3,1,2,0));
|
|
r67 = _mm_shuffle_epi32(r4567,_MM_SHUFFLE(3,3,2,2));
|
|
r89 = _mm_load_si128((xmmi*)in + 2);
|
|
r89 = _mm_shuffle_epi32(r89,_MM_SHUFFLE(3,1,2,0));
|
|
|
|
do {
|
|
r12 = _mm_unpackhi_epi64(r01, _mm_slli_si128(r23, 8));
|
|
r0 = _mm_shuffle_epi32(r01, _MM_SHUFFLE(0,0,0,0));
|
|
r0 = _mm_add_epi64(r0, _mm_and_si128(r0, sse2_top64bitmask.v));
|
|
r0a = _mm_shuffle_epi32(r0,_MM_SHUFFLE(3,2,1,2));
|
|
r1 = _mm_shuffle_epi32(r01, _MM_SHUFFLE(2,2,2,2));
|
|
r2 = _mm_shuffle_epi32(r23, _MM_SHUFFLE(0,0,0,0));
|
|
r2 = _mm_add_epi64(r2, _mm_and_si128(r2, sse2_top64bitmask.v));
|
|
r2a = _mm_shuffle_epi32(r2,_MM_SHUFFLE(3,2,1,2));
|
|
r3 = _mm_shuffle_epi32(r23, _MM_SHUFFLE(2,2,2,2));
|
|
r34 = _mm_unpackhi_epi64(r23, _mm_slli_si128(r45, 8));
|
|
r4 = _mm_shuffle_epi32(r45, _MM_SHUFFLE(0,0,0,0));
|
|
r4 = _mm_add_epi64(r4, _mm_and_si128(r4, sse2_top64bitmask.v));
|
|
r56 = _mm_unpackhi_epi64(r45, _mm_slli_si128(r67, 8));
|
|
r5619 = _mm_mul_epu32(r56, packednineteen.v);
|
|
r5 = _mm_shuffle_epi32(r5619, _MM_SHUFFLE(1,1,1,0));
|
|
r6 = _mm_shuffle_epi32(r5619, _MM_SHUFFLE(3,2,3,2));
|
|
r78 = _mm_unpackhi_epi64(r67, _mm_slli_si128(r89, 8));
|
|
r6x = _mm_unpacklo_epi64(r67, _mm_setzero_si128());
|
|
r7 = _mm_shuffle_epi32(r67, _MM_SHUFFLE(2,2,2,2));
|
|
r7 = _mm_mul_epu32(r7, packed3819.v);
|
|
r7a = _mm_shuffle_epi32(r7, _MM_SHUFFLE(3,3,3,2));
|
|
r8x = _mm_unpacklo_epi64(r89, _mm_setzero_si128());
|
|
r8 = _mm_shuffle_epi32(r89, _MM_SHUFFLE(0,0,0,0));
|
|
r8 = _mm_mul_epu32(r8, packednineteen.v);
|
|
r9 = _mm_shuffle_epi32(r89, _MM_SHUFFLE(2,2,2,2));
|
|
r9x = _mm_slli_epi32(_mm_shuffle_epi32(r89, _MM_SHUFFLE(3,3,3,2)), 1);
|
|
r9 = _mm_mul_epu32(r9, packed3819.v);
|
|
r9a = _mm_shuffle_epi32(r9, _MM_SHUFFLE(2,2,2,2));
|
|
|
|
m01 = _mm_mul_epu32(r01, r0);
|
|
m23 = _mm_mul_epu32(r23, r0a);
|
|
m45 = _mm_mul_epu32(r45, r0a);
|
|
m45 = _mm_add_epi64(m45, _mm_mul_epu32(r23, r2));
|
|
r23 = _mm_slli_epi32(r23, 1);
|
|
m67 = _mm_mul_epu32(r67, r0a);
|
|
m67 = _mm_add_epi64(m67, _mm_mul_epu32(r45, r2a));
|
|
m89 = _mm_mul_epu32(r89, r0a);
|
|
m89 = _mm_add_epi64(m89, _mm_mul_epu32(r67, r2a));
|
|
r67 = _mm_slli_epi32(r67, 1);
|
|
m89 = _mm_add_epi64(m89, _mm_mul_epu32(r45, r4));
|
|
r45 = _mm_slli_epi32(r45, 1);
|
|
|
|
r1 = _mm_slli_epi32(r1, 1);
|
|
r3 = _mm_slli_epi32(r3, 1);
|
|
r1a = _mm_add_epi64(r1, _mm_and_si128(r1, sse2_bot64bitmask.v));
|
|
r3a = _mm_add_epi64(r3, _mm_and_si128(r3, sse2_bot64bitmask.v));
|
|
|
|
m23 = _mm_add_epi64(m23, _mm_mul_epu32(r12, r1));
|
|
m45 = _mm_add_epi64(m45, _mm_mul_epu32(r34, r1a));
|
|
m67 = _mm_add_epi64(m67, _mm_mul_epu32(r56, r1a));
|
|
m67 = _mm_add_epi64(m67, _mm_mul_epu32(r34, r3));
|
|
r34 = _mm_slli_epi32(r34, 1);
|
|
m89 = _mm_add_epi64(m89, _mm_mul_epu32(r78, r1a));
|
|
r78 = _mm_slli_epi32(r78, 1);
|
|
m89 = _mm_add_epi64(m89, _mm_mul_epu32(r56, r3a));
|
|
r56 = _mm_slli_epi32(r56, 1);
|
|
|
|
m01 = _mm_add_epi64(m01, _mm_mul_epu32(_mm_slli_epi32(r12, 1), r9));
|
|
m01 = _mm_add_epi64(m01, _mm_mul_epu32(r34, r7));
|
|
m23 = _mm_add_epi64(m23, _mm_mul_epu32(r34, r9));
|
|
m01 = _mm_add_epi64(m01, _mm_mul_epu32(r56, r5));
|
|
m23 = _mm_add_epi64(m23, _mm_mul_epu32(r56, r7));
|
|
m45 = _mm_add_epi64(m45, _mm_mul_epu32(r56, r9));
|
|
m01 = _mm_add_epi64(m01, _mm_mul_epu32(r23, r8));
|
|
m01 = _mm_add_epi64(m01, _mm_mul_epu32(r45, r6));
|
|
m23 = _mm_add_epi64(m23, _mm_mul_epu32(r45, r8));
|
|
m23 = _mm_add_epi64(m23, _mm_mul_epu32(r6x, r6));
|
|
m45 = _mm_add_epi64(m45, _mm_mul_epu32(r78, r7a));
|
|
m67 = _mm_add_epi64(m67, _mm_mul_epu32(r78, r9));
|
|
m45 = _mm_add_epi64(m45, _mm_mul_epu32(r67, r8));
|
|
m67 = _mm_add_epi64(m67, _mm_mul_epu32(r8x, r8));
|
|
m89 = _mm_add_epi64(m89, _mm_mul_epu32(r9x, r9a));
|
|
|
|
r0 = _mm_unpacklo_epi64(m01, m45);
|
|
r1 = _mm_unpackhi_epi64(m01, m45);
|
|
r2 = _mm_unpacklo_epi64(m23, m67);
|
|
r3 = _mm_unpackhi_epi64(m23, m67);
|
|
r4 = _mm_unpacklo_epi64(m89, m89);
|
|
r5 = _mm_unpackhi_epi64(m89, m89);
|
|
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
c1 = _mm_srli_epi64(r1, 25); c2 = _mm_srli_epi64(r3, 25); r1 = _mm_and_si128(r1, packedmask25.v); r3 = _mm_and_si128(r3, packedmask25.v); r2 = _mm_add_epi64(r2, c1); r4 = _mm_add_epi64(r4, c2); c3 = _mm_slli_si128(c2, 8);
|
|
c1 = _mm_srli_epi64(r4, 26); r4 = _mm_and_si128(r4, packedmask26.v); r5 = _mm_add_epi64(r5, c1);
|
|
c1 = _mm_srli_epi64(r5, 25); r5 = _mm_and_si128(r5, packedmask25.v); r0 = _mm_add_epi64(r0, _mm_unpackhi_epi64(_mm_mul_epu32(c1, packednineteen.v), c3));
|
|
c1 = _mm_srli_epi64(r0, 26); c2 = _mm_srli_epi64(r2, 26); r0 = _mm_and_si128(r0, packedmask26.v); r2 = _mm_and_si128(r2, packedmask26.v); r1 = _mm_add_epi64(r1, c1); r3 = _mm_add_epi64(r3, c2);
|
|
|
|
r01 = _mm_unpacklo_epi64(r0, r1);
|
|
r45 = _mm_unpackhi_epi64(r0, r1);
|
|
r23 = _mm_unpacklo_epi64(r2, r3);
|
|
r67 = _mm_unpackhi_epi64(r2, r3);
|
|
r89 = _mm_unpackhi_epi64(r4, r5);
|
|
} while (--count);
|
|
|
|
r0123 = _mm_shuffle_epi32(r23, _MM_SHUFFLE(2,0,3,3));
|
|
r4567 = _mm_shuffle_epi32(r67, _MM_SHUFFLE(2,0,3,3));
|
|
r0123 = _mm_or_si128(r0123, _mm_shuffle_epi32(r01, _MM_SHUFFLE(3,3,2,0)));
|
|
r4567 = _mm_or_si128(r4567, _mm_shuffle_epi32(r45, _MM_SHUFFLE(3,3,2,0)));
|
|
r89 = _mm_shuffle_epi32(r89, _MM_SHUFFLE(3,3,2,0));
|
|
|
|
_mm_store_si128((xmmi*)r + 0, r0123);
|
|
_mm_store_si128((xmmi*)r + 1, r4567);
|
|
_mm_store_si128((xmmi*)r + 2, r89);
|
|
}
|
|
|
|
/* square two packed bignums */
|
|
inline void
|
|
curve25519_square_packed64(packedelem64 *out, const packedelem64 *r) {
|
|
xmmi r0,r1,r2,r3;
|
|
xmmi r1_2,r3_2,r4_2,r5_2,r6_2,r7_2;
|
|
xmmi d5,d6,d7,d8,d9;
|
|
xmmi c1,c2;
|
|
|
|
r0 = r[0].v;
|
|
r1 = r[1].v;
|
|
r2 = r[2].v;
|
|
r3 = r[3].v;
|
|
|
|
out[0].v = _mm_mul_epu32(r0, r0);
|
|
r0 = _mm_slli_epi32(r0, 1);
|
|
out[1].v = _mm_mul_epu32(r0, r1);
|
|
r1_2 = _mm_slli_epi32(r1, 1);
|
|
out[2].v = _mm_add_epi64(_mm_mul_epu32(r0, r2 ), _mm_mul_epu32(r1, r1_2));
|
|
r1 = r1_2;
|
|
out[3].v = _mm_add_epi64(_mm_mul_epu32(r0, r3 ), _mm_mul_epu32(r1, r2 ));
|
|
r3_2 = _mm_slli_epi32(r3, 1);
|
|
out[4].v = _mm_add_epi64(_mm_mul_epu32(r0, r[4].v), _mm_add_epi64(_mm_mul_epu32(r1, r3_2 ), _mm_mul_epu32(r2, r2)));
|
|
r2 = _mm_slli_epi32(r2, 1);
|
|
out[5].v = _mm_add_epi64(_mm_mul_epu32(r0, r[5].v), _mm_add_epi64(_mm_mul_epu32(r1, r[4].v), _mm_mul_epu32(r2, r3)));
|
|
r5_2 = _mm_slli_epi32(r[5].v, 1);
|
|
out[6].v = _mm_add_epi64(_mm_mul_epu32(r0, r[6].v), _mm_add_epi64(_mm_mul_epu32(r1, r5_2 ), _mm_add_epi64(_mm_mul_epu32(r2, r[4].v), _mm_mul_epu32(r3, r3_2 ))));
|
|
r3 = r3_2;
|
|
out[7].v = _mm_add_epi64(_mm_mul_epu32(r0, r[7].v), _mm_add_epi64(_mm_mul_epu32(r1, r[6].v), _mm_add_epi64(_mm_mul_epu32(r2, r[5].v), _mm_mul_epu32(r3, r[4].v))));
|
|
r7_2 = _mm_slli_epi32(r[7].v, 1);
|
|
out[8].v = _mm_add_epi64(_mm_mul_epu32(r0, r[8].v), _mm_add_epi64(_mm_mul_epu32(r1, r7_2 ), _mm_add_epi64(_mm_mul_epu32(r2, r[6].v), _mm_add_epi64(_mm_mul_epu32(r3, r5_2 ), _mm_mul_epu32(r[4].v, r[4].v)))));
|
|
out[9].v = _mm_add_epi64(_mm_mul_epu32(r0, r[9].v), _mm_add_epi64(_mm_mul_epu32(r1, r[8].v), _mm_add_epi64(_mm_mul_epu32(r2, r[7].v), _mm_add_epi64(_mm_mul_epu32(r3, r[6].v), _mm_mul_epu32(r[4].v, r5_2 )))));
|
|
|
|
d5 = _mm_mul_epu32(r[5].v, packedthirtyeight.v);
|
|
d6 = _mm_mul_epu32(r[6].v, packednineteen.v);
|
|
d7 = _mm_mul_epu32(r[7].v, packedthirtyeight.v);
|
|
d8 = _mm_mul_epu32(r[8].v, packednineteen.v);
|
|
d9 = _mm_mul_epu32(r[9].v, packedthirtyeight.v);
|
|
|
|
r4_2 = _mm_slli_epi32(r[4].v, 1);
|
|
r6_2 = _mm_slli_epi32(r[6].v, 1);
|
|
out[0].v = _mm_add_epi64(out[0].v, _mm_add_epi64(_mm_mul_epu32(d9, r1 ), _mm_add_epi64(_mm_mul_epu32(d8, r2 ), _mm_add_epi64(_mm_mul_epu32(d7, r3 ), _mm_add_epi64(_mm_mul_epu32(d6, r4_2), _mm_mul_epu32(d5, r[5].v))))));
|
|
out[1].v = _mm_add_epi64(out[1].v, _mm_add_epi64(_mm_mul_epu32(d9, _mm_srli_epi32(r2, 1)), _mm_add_epi64(_mm_mul_epu32(d8, r3 ), _mm_add_epi64(_mm_mul_epu32(d7, r[4].v), _mm_mul_epu32(d6, r5_2 )))));
|
|
out[2].v = _mm_add_epi64(out[2].v, _mm_add_epi64(_mm_mul_epu32(d9, r3 ), _mm_add_epi64(_mm_mul_epu32(d8, r4_2), _mm_add_epi64(_mm_mul_epu32(d7, r5_2 ), _mm_mul_epu32(d6, r[6].v)))));
|
|
out[3].v = _mm_add_epi64(out[3].v, _mm_add_epi64(_mm_mul_epu32(d9, r[4].v ), _mm_add_epi64(_mm_mul_epu32(d8, r5_2), _mm_mul_epu32(d7, r[6].v))));
|
|
out[4].v = _mm_add_epi64(out[4].v, _mm_add_epi64(_mm_mul_epu32(d9, r5_2 ), _mm_add_epi64(_mm_mul_epu32(d8, r6_2), _mm_mul_epu32(d7, r[7].v))));
|
|
out[5].v = _mm_add_epi64(out[5].v, _mm_add_epi64(_mm_mul_epu32(d9, r[6].v ), _mm_mul_epu32(d8, r7_2 )));
|
|
out[6].v = _mm_add_epi64(out[6].v, _mm_add_epi64(_mm_mul_epu32(d9, r7_2 ), _mm_mul_epu32(d8, r[8].v)));
|
|
out[7].v = _mm_add_epi64(out[7].v, _mm_mul_epu32(d9, r[8].v));
|
|
out[8].v = _mm_add_epi64(out[8].v, _mm_mul_epu32(d9, r[9].v));
|
|
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
c1 = _mm_srli_epi64(out[1].v, 25); c2 = _mm_srli_epi64(out[5].v, 25); out[1].v = _mm_and_si128(out[1].v, packedmask25.v); out[5].v = _mm_and_si128(out[5].v, packedmask25.v); out[2].v = _mm_add_epi64(out[2].v, c1); out[6].v = _mm_add_epi64(out[6].v, c2);
|
|
c1 = _mm_srli_epi64(out[2].v, 26); c2 = _mm_srli_epi64(out[6].v, 26); out[2].v = _mm_and_si128(out[2].v, packedmask26.v); out[6].v = _mm_and_si128(out[6].v, packedmask26.v); out[3].v = _mm_add_epi64(out[3].v, c1); out[7].v = _mm_add_epi64(out[7].v, c2);
|
|
c1 = _mm_srli_epi64(out[3].v, 25); c2 = _mm_srli_epi64(out[7].v, 25); out[3].v = _mm_and_si128(out[3].v, packedmask25.v); out[7].v = _mm_and_si128(out[7].v, packedmask25.v); out[4].v = _mm_add_epi64(out[4].v, c1); out[8].v = _mm_add_epi64(out[8].v, c2);
|
|
c2 = _mm_srli_epi64(out[8].v, 26); out[8].v = _mm_and_si128(out[8].v, packedmask26.v); out[9].v = _mm_add_epi64(out[9].v, c2);
|
|
c2 = _mm_srli_epi64(out[9].v, 25); out[9].v = _mm_and_si128(out[9].v, packedmask25.v); out[0].v = _mm_add_epi64(out[0].v, _mm_mul_epu32(c2, packednineteen.v));
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
}
|
|
|
|
/* make [nqx+nqz,nqpqx+nqpqz], [nqpqx-nqpqz,nqx-nqz] from [nqx+nqz,nqpqx+nqpqz], [nqx-nqz,nqpqx-nqpqz] */
|
|
inline void
|
|
curve25519_make_nqpq(packedelem64 *primex, packedelem64 *primez, const packedelem32 *pqx, const packedelem32 *pqz) {
|
|
primex[0].v = _mm_shuffle_epi32(pqx[0].v, _MM_SHUFFLE(1,1,0,0));
|
|
primex[1].v = _mm_shuffle_epi32(pqx[0].v, _MM_SHUFFLE(3,3,2,2));
|
|
primex[2].v = _mm_shuffle_epi32(pqx[1].v, _MM_SHUFFLE(1,1,0,0));
|
|
primex[3].v = _mm_shuffle_epi32(pqx[1].v, _MM_SHUFFLE(3,3,2,2));
|
|
primex[4].v = _mm_shuffle_epi32(pqx[2].v, _MM_SHUFFLE(1,1,0,0));
|
|
primex[5].v = _mm_shuffle_epi32(pqx[2].v, _MM_SHUFFLE(3,3,2,2));
|
|
primex[6].v = _mm_shuffle_epi32(pqx[3].v, _MM_SHUFFLE(1,1,0,0));
|
|
primex[7].v = _mm_shuffle_epi32(pqx[3].v, _MM_SHUFFLE(3,3,2,2));
|
|
primex[8].v = _mm_shuffle_epi32(pqx[4].v, _MM_SHUFFLE(1,1,0,0));
|
|
primex[9].v = _mm_shuffle_epi32(pqx[4].v, _MM_SHUFFLE(3,3,2,2));
|
|
primez[0].v = _mm_shuffle_epi32(pqz[0].v, _MM_SHUFFLE(0,0,1,1));
|
|
primez[1].v = _mm_shuffle_epi32(pqz[0].v, _MM_SHUFFLE(2,2,3,3));
|
|
primez[2].v = _mm_shuffle_epi32(pqz[1].v, _MM_SHUFFLE(0,0,1,1));
|
|
primez[3].v = _mm_shuffle_epi32(pqz[1].v, _MM_SHUFFLE(2,2,3,3));
|
|
primez[4].v = _mm_shuffle_epi32(pqz[2].v, _MM_SHUFFLE(0,0,1,1));
|
|
primez[5].v = _mm_shuffle_epi32(pqz[2].v, _MM_SHUFFLE(2,2,3,3));
|
|
primez[6].v = _mm_shuffle_epi32(pqz[3].v, _MM_SHUFFLE(0,0,1,1));
|
|
primez[7].v = _mm_shuffle_epi32(pqz[3].v, _MM_SHUFFLE(2,2,3,3));
|
|
primez[8].v = _mm_shuffle_epi32(pqz[4].v, _MM_SHUFFLE(0,0,1,1));
|
|
primez[9].v = _mm_shuffle_epi32(pqz[4].v, _MM_SHUFFLE(2,2,3,3));
|
|
}
|
|
|
|
/* make [nqx+nqz,nqx-nqz] from [nqx+nqz,nqpqx+nqpqz], [nqx-nqz,nqpqx-nqpqz] */
|
|
inline void
|
|
curve25519_make_nq(packedelem64 *nq, const packedelem32 *pqx, const packedelem32 *pqz) {
|
|
nq[0].v = _mm_unpacklo_epi64(pqx[0].v, pqz[0].v);
|
|
nq[1].v = _mm_unpackhi_epi64(pqx[0].v, pqz[0].v);
|
|
nq[2].v = _mm_unpacklo_epi64(pqx[1].v, pqz[1].v);
|
|
nq[3].v = _mm_unpackhi_epi64(pqx[1].v, pqz[1].v);
|
|
nq[4].v = _mm_unpacklo_epi64(pqx[2].v, pqz[2].v);
|
|
nq[5].v = _mm_unpackhi_epi64(pqx[2].v, pqz[2].v);
|
|
nq[6].v = _mm_unpacklo_epi64(pqx[3].v, pqz[3].v);
|
|
nq[7].v = _mm_unpackhi_epi64(pqx[3].v, pqz[3].v);
|
|
nq[8].v = _mm_unpacklo_epi64(pqx[4].v, pqz[4].v);
|
|
nq[9].v = _mm_unpackhi_epi64(pqx[4].v, pqz[4].v);
|
|
}
|
|
|
|
/* compute [nqx+nqz,nqx-nqz] from nqx, nqz */
|
|
inline void
|
|
curve25519_compute_nq(packedelem64 *nq, const bignum25519 nqx, const bignum25519 nqz) {
|
|
xmmi x0,x1,x2;
|
|
xmmi z0,z1,z2;
|
|
xmmi a0,a1,a2;
|
|
xmmi s0,s1,s2;
|
|
xmmi r0,r1;
|
|
xmmi c1,c2;
|
|
x0 = _mm_load_si128((xmmi*)nqx + 0);
|
|
x1 = _mm_load_si128((xmmi*)nqx + 1);
|
|
x2 = _mm_load_si128((xmmi*)nqx + 2);
|
|
z0 = _mm_load_si128((xmmi*)nqz + 0);
|
|
z1 = _mm_load_si128((xmmi*)nqz + 1);
|
|
z2 = _mm_load_si128((xmmi*)nqz + 2);
|
|
a0 = _mm_add_epi32(x0, z0);
|
|
a1 = _mm_add_epi32(x1, z1);
|
|
a2 = _mm_add_epi32(x2, z2);
|
|
s0 = _mm_add_epi32(x0, packed2p0.v);
|
|
s1 = _mm_add_epi32(x1, packed2p1.v);
|
|
s2 = _mm_add_epi32(x2, packed2p2.v);
|
|
s0 = _mm_sub_epi32(s0, z0);
|
|
s1 = _mm_sub_epi32(s1, z1);
|
|
s2 = _mm_sub_epi32(s2, z2);
|
|
r0 = _mm_and_si128(_mm_shuffle_epi32(s0, _MM_SHUFFLE(2,2,0,0)), sse2_bot32bitmask.v);
|
|
r1 = _mm_and_si128(_mm_shuffle_epi32(s0, _MM_SHUFFLE(3,3,1,1)), sse2_bot32bitmask.v);
|
|
c1 = _mm_srli_epi32(r0, 26);
|
|
c2 = _mm_srli_epi32(r1, 25);
|
|
r0 = _mm_and_si128(r0, packedmask26.v);
|
|
r1 = _mm_and_si128(r1, packedmask25.v);
|
|
r0 = _mm_add_epi32(r0, _mm_slli_si128(c2, 8));
|
|
r1 = _mm_add_epi32(r1, c1);
|
|
s0 = _mm_unpacklo_epi64(_mm_unpacklo_epi32(r0, r1), _mm_unpackhi_epi32(r0, r1));
|
|
s1 = _mm_add_epi32(s1, _mm_srli_si128(c2, 8));
|
|
nq[0].v = _mm_unpacklo_epi64(a0, s0);
|
|
nq[2].v = _mm_unpackhi_epi64(a0, s0);
|
|
nq[4].v = _mm_unpacklo_epi64(a1, s1);
|
|
nq[6].v = _mm_unpackhi_epi64(a1, s1);
|
|
nq[8].v = _mm_unpacklo_epi64(a2, s2);
|
|
nq[1].v = _mm_shuffle_epi32(nq[0].v, _MM_SHUFFLE(3,3,1,1));
|
|
nq[3].v = _mm_shuffle_epi32(nq[2].v, _MM_SHUFFLE(3,3,1,1));
|
|
nq[5].v = _mm_shuffle_epi32(nq[4].v, _MM_SHUFFLE(3,3,1,1));
|
|
nq[7].v = _mm_shuffle_epi32(nq[6].v, _MM_SHUFFLE(3,3,1,1));
|
|
nq[9].v = _mm_shuffle_epi32(nq[8].v, _MM_SHUFFLE(3,3,1,1));
|
|
}
|
|
|
|
|
|
/* compute [x+z,x-z] from [x,z] */
|
|
inline void
|
|
curve25519_addsub_packed64(packedelem64 *r) {
|
|
packed32bignum25519 x,z,add,sub;
|
|
|
|
x[0].v = _mm_unpacklo_epi64(r[0].v, r[1].v);
|
|
z[0].v = _mm_unpackhi_epi64(r[0].v, r[1].v);
|
|
x[1].v = _mm_unpacklo_epi64(r[2].v, r[3].v);
|
|
z[1].v = _mm_unpackhi_epi64(r[2].v, r[3].v);
|
|
x[2].v = _mm_unpacklo_epi64(r[4].v, r[5].v);
|
|
z[2].v = _mm_unpackhi_epi64(r[4].v, r[5].v);
|
|
x[3].v = _mm_unpacklo_epi64(r[6].v, r[7].v);
|
|
z[3].v = _mm_unpackhi_epi64(r[6].v, r[7].v);
|
|
x[4].v = _mm_unpacklo_epi64(r[8].v, r[9].v);
|
|
z[4].v = _mm_unpackhi_epi64(r[8].v, r[9].v);
|
|
|
|
curve25519_add_packed32(add, x, z);
|
|
curve25519_sub_packed32(sub, x, z);
|
|
|
|
r[0].v = _mm_unpacklo_epi64(add[0].v, sub[0].v);
|
|
r[1].v = _mm_unpackhi_epi64(add[0].v, sub[0].v);
|
|
r[2].v = _mm_unpacklo_epi64(add[1].v, sub[1].v);
|
|
r[3].v = _mm_unpackhi_epi64(add[1].v, sub[1].v);
|
|
r[4].v = _mm_unpacklo_epi64(add[2].v, sub[2].v);
|
|
r[5].v = _mm_unpackhi_epi64(add[2].v, sub[2].v);
|
|
r[6].v = _mm_unpacklo_epi64(add[3].v, sub[3].v);
|
|
r[7].v = _mm_unpackhi_epi64(add[3].v, sub[3].v);
|
|
r[8].v = _mm_unpacklo_epi64(add[4].v, sub[4].v);
|
|
r[9].v = _mm_unpackhi_epi64(add[4].v, sub[4].v);
|
|
}
|
|
|
|
/* compute [x,z] * [121666,121665] */
|
|
inline void
|
|
curve25519_121665_packed64(packedelem64 *out, const packedelem64 *in) {
|
|
xmmi c1,c2;
|
|
|
|
out[0].v = _mm_mul_epu32(in[0].v, packed121666121665.v);
|
|
out[1].v = _mm_mul_epu32(in[1].v, packed121666121665.v);
|
|
out[2].v = _mm_mul_epu32(in[2].v, packed121666121665.v);
|
|
out[3].v = _mm_mul_epu32(in[3].v, packed121666121665.v);
|
|
out[4].v = _mm_mul_epu32(in[4].v, packed121666121665.v);
|
|
out[5].v = _mm_mul_epu32(in[5].v, packed121666121665.v);
|
|
out[6].v = _mm_mul_epu32(in[6].v, packed121666121665.v);
|
|
out[7].v = _mm_mul_epu32(in[7].v, packed121666121665.v);
|
|
out[8].v = _mm_mul_epu32(in[8].v, packed121666121665.v);
|
|
out[9].v = _mm_mul_epu32(in[9].v, packed121666121665.v);
|
|
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
c1 = _mm_srli_epi64(out[1].v, 25); c2 = _mm_srli_epi64(out[5].v, 25); out[1].v = _mm_and_si128(out[1].v, packedmask25.v); out[5].v = _mm_and_si128(out[5].v, packedmask25.v); out[2].v = _mm_add_epi64(out[2].v, c1); out[6].v = _mm_add_epi64(out[6].v, c2);
|
|
c1 = _mm_srli_epi64(out[2].v, 26); c2 = _mm_srli_epi64(out[6].v, 26); out[2].v = _mm_and_si128(out[2].v, packedmask26.v); out[6].v = _mm_and_si128(out[6].v, packedmask26.v); out[3].v = _mm_add_epi64(out[3].v, c1); out[7].v = _mm_add_epi64(out[7].v, c2);
|
|
c1 = _mm_srli_epi64(out[3].v, 25); c2 = _mm_srli_epi64(out[7].v, 25); out[3].v = _mm_and_si128(out[3].v, packedmask25.v); out[7].v = _mm_and_si128(out[7].v, packedmask25.v); out[4].v = _mm_add_epi64(out[4].v, c1); out[8].v = _mm_add_epi64(out[8].v, c2);
|
|
c2 = _mm_srli_epi64(out[8].v, 26); out[8].v = _mm_and_si128(out[8].v, packedmask26.v); out[9].v = _mm_add_epi64(out[9].v, c2);
|
|
c2 = _mm_srli_epi64(out[9].v, 25); out[9].v = _mm_and_si128(out[9].v, packedmask25.v); out[0].v = _mm_add_epi64(out[0].v, _mm_mul_epu32(c2, packednineteen.v));
|
|
c1 = _mm_srli_epi64(out[0].v, 26); c2 = _mm_srli_epi64(out[4].v, 26); out[0].v = _mm_and_si128(out[0].v, packedmask26.v); out[4].v = _mm_and_si128(out[4].v, packedmask26.v); out[1].v = _mm_add_epi64(out[1].v, c1); out[5].v = _mm_add_epi64(out[5].v, c2);
|
|
}
|
|
|
|
/* compute [sq.x,sqscalar.x-sqscalar.z] * [sq.z,sq.x-sq.z] */
|
|
inline void
|
|
curve25519_final_nq(packedelem64 *nq, const packedelem64 *sq, const packedelem64 *sq121665) {
|
|
packed32bignum25519 x, z, sub;
|
|
packed64bignum25519 t, nqa, nqb;
|
|
|
|
x[0].v = _mm_or_si128(_mm_unpacklo_epi64(sq[0].v, sq[1].v), _mm_slli_si128(_mm_unpacklo_epi64(sq121665[0].v, sq121665[1].v), 4));
|
|
z[0].v = _mm_or_si128(_mm_unpackhi_epi64(sq[0].v, sq[1].v), _mm_slli_si128(_mm_unpackhi_epi64(sq121665[0].v, sq121665[1].v), 4));
|
|
x[1].v = _mm_or_si128(_mm_unpacklo_epi64(sq[2].v, sq[3].v), _mm_slli_si128(_mm_unpacklo_epi64(sq121665[2].v, sq121665[3].v), 4));
|
|
z[1].v = _mm_or_si128(_mm_unpackhi_epi64(sq[2].v, sq[3].v), _mm_slli_si128(_mm_unpackhi_epi64(sq121665[2].v, sq121665[3].v), 4));
|
|
x[2].v = _mm_or_si128(_mm_unpacklo_epi64(sq[4].v, sq[5].v), _mm_slli_si128(_mm_unpacklo_epi64(sq121665[4].v, sq121665[5].v), 4));
|
|
z[2].v = _mm_or_si128(_mm_unpackhi_epi64(sq[4].v, sq[5].v), _mm_slli_si128(_mm_unpackhi_epi64(sq121665[4].v, sq121665[5].v), 4));
|
|
x[3].v = _mm_or_si128(_mm_unpacklo_epi64(sq[6].v, sq[7].v), _mm_slli_si128(_mm_unpacklo_epi64(sq121665[6].v, sq121665[7].v), 4));
|
|
z[3].v = _mm_or_si128(_mm_unpackhi_epi64(sq[6].v, sq[7].v), _mm_slli_si128(_mm_unpackhi_epi64(sq121665[6].v, sq121665[7].v), 4));
|
|
x[4].v = _mm_or_si128(_mm_unpacklo_epi64(sq[8].v, sq[9].v), _mm_slli_si128(_mm_unpacklo_epi64(sq121665[8].v, sq121665[9].v), 4));
|
|
z[4].v = _mm_or_si128(_mm_unpackhi_epi64(sq[8].v, sq[9].v), _mm_slli_si128(_mm_unpackhi_epi64(sq121665[8].v, sq121665[9].v), 4));
|
|
|
|
curve25519_sub_packed32(sub, x, z);
|
|
|
|
t[0].v = _mm_shuffle_epi32(sub[0].v, _MM_SHUFFLE(1,1,0,0));
|
|
t[1].v = _mm_shuffle_epi32(sub[0].v, _MM_SHUFFLE(3,3,2,2));
|
|
t[2].v = _mm_shuffle_epi32(sub[1].v, _MM_SHUFFLE(1,1,0,0));
|
|
t[3].v = _mm_shuffle_epi32(sub[1].v, _MM_SHUFFLE(3,3,2,2));
|
|
t[4].v = _mm_shuffle_epi32(sub[2].v, _MM_SHUFFLE(1,1,0,0));
|
|
t[5].v = _mm_shuffle_epi32(sub[2].v, _MM_SHUFFLE(3,3,2,2));
|
|
t[6].v = _mm_shuffle_epi32(sub[3].v, _MM_SHUFFLE(1,1,0,0));
|
|
t[7].v = _mm_shuffle_epi32(sub[3].v, _MM_SHUFFLE(3,3,2,2));
|
|
t[8].v = _mm_shuffle_epi32(sub[4].v, _MM_SHUFFLE(1,1,0,0));
|
|
t[9].v = _mm_shuffle_epi32(sub[4].v, _MM_SHUFFLE(3,3,2,2));
|
|
|
|
nqa[0].v = _mm_unpacklo_epi64(sq[0].v, t[0].v);
|
|
nqb[0].v = _mm_unpackhi_epi64(sq[0].v, t[0].v);
|
|
nqa[1].v = _mm_unpacklo_epi64(sq[1].v, t[1].v);
|
|
nqb[1].v = _mm_unpackhi_epi64(sq[1].v, t[1].v);
|
|
nqa[2].v = _mm_unpacklo_epi64(sq[2].v, t[2].v);
|
|
nqb[2].v = _mm_unpackhi_epi64(sq[2].v, t[2].v);
|
|
nqa[3].v = _mm_unpacklo_epi64(sq[3].v, t[3].v);
|
|
nqb[3].v = _mm_unpackhi_epi64(sq[3].v, t[3].v);
|
|
nqa[4].v = _mm_unpacklo_epi64(sq[4].v, t[4].v);
|
|
nqb[4].v = _mm_unpackhi_epi64(sq[4].v, t[4].v);
|
|
nqa[5].v = _mm_unpacklo_epi64(sq[5].v, t[5].v);
|
|
nqb[5].v = _mm_unpackhi_epi64(sq[5].v, t[5].v);
|
|
nqa[6].v = _mm_unpacklo_epi64(sq[6].v, t[6].v);
|
|
nqb[6].v = _mm_unpackhi_epi64(sq[6].v, t[6].v);
|
|
nqa[7].v = _mm_unpacklo_epi64(sq[7].v, t[7].v);
|
|
nqb[7].v = _mm_unpackhi_epi64(sq[7].v, t[7].v);
|
|
nqa[8].v = _mm_unpacklo_epi64(sq[8].v, t[8].v);
|
|
nqb[8].v = _mm_unpackhi_epi64(sq[8].v, t[8].v);
|
|
nqa[9].v = _mm_unpacklo_epi64(sq[9].v, t[9].v);
|
|
nqb[9].v = _mm_unpackhi_epi64(sq[9].v, t[9].v);
|
|
|
|
curve25519_mul_packed64(nq, nqa, nqb);
|
|
}
|
|
|
|
/*
|
|
* In: b = 2^5 - 2^0
|
|
* Out: b = 2^250 - 2^0
|
|
*/
|
|
void
|
|
curve25519_pow_two5mtwo0_two250mtwo0(bignum25519 b) {
|
|
ALIGN(16) bignum25519 t0,c;
|
|
|
|
/* 2^5 - 2^0 */ /* b */
|
|
/* 2^10 - 2^5 */ curve25519_square_times(t0, b, 5);
|
|
/* 2^10 - 2^0 */ curve25519_mul(b, t0, b);
|
|
/* 2^20 - 2^10 */ curve25519_square_times(t0, b, 10);
|
|
/* 2^20 - 2^0 */ curve25519_mul(c, t0, b);
|
|
/* 2^40 - 2^20 */ curve25519_square_times(t0, c, 20);
|
|
/* 2^40 - 2^0 */ curve25519_mul(t0, t0, c);
|
|
/* 2^50 - 2^10 */ curve25519_square_times(t0, t0, 10);
|
|
/* 2^50 - 2^0 */ curve25519_mul(b, t0, b);
|
|
/* 2^100 - 2^50 */ curve25519_square_times(t0, b, 50);
|
|
/* 2^100 - 2^0 */ curve25519_mul(c, t0, b);
|
|
/* 2^200 - 2^100 */ curve25519_square_times(t0, c, 100);
|
|
/* 2^200 - 2^0 */ curve25519_mul(t0, t0, c);
|
|
/* 2^250 - 2^50 */ curve25519_square_times(t0, t0, 50);
|
|
/* 2^250 - 2^0 */ curve25519_mul(b, t0, b);
|
|
}
|
|
|
|
/*
|
|
* z^(p - 2) = z(2^255 - 21)
|
|
*/
|
|
void
|
|
curve25519_recip(bignum25519 out, const bignum25519 z) {
|
|
ALIGN(16) bignum25519 a, t0, b;
|
|
|
|
/* 2 */ curve25519_square(a, z); /* a = 2 */
|
|
/* 8 */ curve25519_square_times(t0, a, 2);
|
|
/* 9 */ curve25519_mul(b, t0, z); /* b = 9 */
|
|
/* 11 */ curve25519_mul(a, b, a); /* a = 11 */
|
|
/* 22 */ curve25519_square(t0, a);
|
|
/* 2^5 - 2^0 = 31 */ curve25519_mul(b, t0, b);
|
|
/* 2^250 - 2^0 */ curve25519_pow_two5mtwo0_two250mtwo0(b);
|
|
/* 2^255 - 2^5 */ curve25519_square_times(b, b, 5);
|
|
/* 2^255 - 21 */ curve25519_mul(out, b, a);
|
|
}
|
|
|
|
ANONYMOUS_NAMESPACE_END
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
NAMESPACE_BEGIN(Donna)
|
|
|
|
int curve25519_mult_SSE2(byte sharedKey[32], const byte secretKey[32], const byte othersKey[32])
|
|
{
|
|
FixedSizeSecBlock<byte, 32> e;
|
|
for (size_t i = 0;i < 32;++i)
|
|
e[i] = secretKey[i];
|
|
e[0] &= 0xf8; e[31] &= 0x7f; e[31] |= 0x40;
|
|
|
|
ALIGN(16) bignum25519 nqx = {1}, nqpqz = {1}, nqz = {0}, nqpqx, zmone;
|
|
packed32bignum25519 qx, qz, pqz, pqx;
|
|
packed64bignum25519 nq, sq, sqscalar, prime, primex, primez, nqpq;
|
|
bignum25519mulprecomp preq;
|
|
size_t bit=0;
|
|
|
|
curve25519_expand(nqpqx, othersKey);
|
|
curve25519_mul_precompute(&preq, nqpqx);
|
|
|
|
/* do bits 254..3 */
|
|
for (size_t i = 254, lastbit=0; i >= 3; i--) {
|
|
bit = (e[i/8] >> (i & 7)) & 1;
|
|
curve25519_swap_conditional(nqx, nqpqx, (word32)(bit ^ lastbit));
|
|
curve25519_swap_conditional(nqz, nqpqz, (word32)(bit ^ lastbit));
|
|
lastbit = bit;
|
|
|
|
curve25519_tangle32(qx, nqx, nqpqx); /* qx = [nqx,nqpqx] */
|
|
curve25519_tangle32(qz, nqz, nqpqz); /* qz = [nqz,nqpqz] */
|
|
|
|
curve25519_add_packed32(pqx, qx, qz); /* pqx = [nqx+nqz,nqpqx+nqpqz] */
|
|
curve25519_sub_packed32(pqz, qx, qz); /* pqz = [nqx-nqz,nqpqx-nqpqz] */
|
|
|
|
curve25519_make_nqpq(primex, primez, pqx, pqz); /* primex = [nqx+nqz,nqpqx+nqpqz], primez = [nqpqx-nqpqz,nqx-nqz] */
|
|
curve25519_mul_packed64(prime, primex, primez); /* prime = [nqx+nqz,nqpqx+nqpqz] * [nqpqx-nqpqz,nqx-nqz] */
|
|
curve25519_addsub_packed64(prime); /* prime = [prime.x+prime.z,prime.x-prime.z] */
|
|
curve25519_square_packed64(nqpq, prime); /* nqpq = prime^2 */
|
|
curve25519_untangle64(nqpqx, nqpqz, nqpq);
|
|
curve25519_mul_precomputed(nqpqz, nqpqz, &preq); /* nqpqz = nqpqz * q */
|
|
|
|
/* (((sq.x-sq.z)*121665)+sq.x) * (sq.x-sq.z) is equivalent to (sq.x*121666-sq.z*121665) * (sq.x-sq.z) */
|
|
curve25519_make_nq(nq, pqx, pqz); /* nq = [nqx+nqz,nqx-nqz] */
|
|
curve25519_square_packed64(sq, nq); /* sq = nq^2 */
|
|
curve25519_121665_packed64(sqscalar, sq); /* sqscalar = sq * [121666,121665] */
|
|
curve25519_final_nq(nq, sq, sqscalar); /* nq = [sq.x,sqscalar.x-sqscalar.z] * [sq.z,sq.x-sq.z] */
|
|
curve25519_untangle64(nqx, nqz, nq);
|
|
};
|
|
|
|
/* it's possible to get rid of this swap with the swap in the above loop
|
|
at the bottom instead of the top, but compilers seem to optimize better this way */
|
|
curve25519_swap_conditional(nqx, nqpqx, (word32)bit);
|
|
curve25519_swap_conditional(nqz, nqpqz, (word32)bit);
|
|
|
|
/* do bits 2..0 */
|
|
for (size_t i = 0; i < 3; i++) {
|
|
curve25519_compute_nq(nq, nqx, nqz);
|
|
curve25519_square_packed64(sq, nq); /* sq = nq^2 */
|
|
curve25519_121665_packed64(sqscalar, sq); /* sqscalar = sq * [121666,121665] */
|
|
curve25519_final_nq(nq, sq, sqscalar); /* nq = [sq.x,sqscalar.x-sqscalar.z] * [sq.z,sq.x-sq.z] */
|
|
curve25519_untangle64(nqx, nqz, nq);
|
|
}
|
|
|
|
curve25519_recip(zmone, nqz);
|
|
curve25519_mul(nqz, nqx, zmone);
|
|
curve25519_contract(sharedKey, nqz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
NAMESPACE_END // Donna
|
|
NAMESPACE_END // CryptoPP
|
|
|
|
#endif // CRYPTOPP_CURVE25519_SSE2
|