155 lines
4.4 KiB
C++
155 lines
4.4 KiB
C++
// simeck.cpp - written and placed in the public domain by Gangqiang Yang and Jeffrey Walton.
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// Based on "The Simeck Family of Lightweight Block Ciphers" by Gangqiang Yang,
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// Bo Zhu, Valentin Suder, Mark D. Aagaard, and Guang Gong
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#include "pch.h"
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#include "config.h"
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#include "simeck.h"
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#include "misc.h"
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#include "cpu.h"
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ANONYMOUS_NAMESPACE_BEGIN
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using CryptoPP::rotlConstant;
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using CryptoPP::rotrConstant;
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/// \brief SIMECK encryption round
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/// \tparam T word type
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/// \param key the key for the round or iteration
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/// \param left the first value
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/// \param right the second value
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/// \details SIMECK_Encryption serves as the key schedule, encryption and
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/// decryption functions.
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template <class T>
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inline void SIMECK_Encryption(const T key, T& left, T& right)
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{
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const T temp = left;
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left = (left & rotlConstant<5>(left)) ^ rotlConstant<1>(left) ^ right ^ key;
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right = temp;
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}
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ANONYMOUS_NAMESPACE_END
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NAMESPACE_BEGIN(CryptoPP)
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std::string SIMECK32::Base::AlgorithmProvider() const
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{
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return "C++";
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}
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void SIMECK32::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms)
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{
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CRYPTOPP_UNUSED(params);
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CRYPTOPP_UNUSED(keyLength);
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GetBlock<word16, BigEndian> kblock(userKey);
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kblock(m_t[3])(m_t[2])(m_t[1])(m_t[0]);
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word16 constant = 0xFFFC;
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word32 sequence = 0x9A42BB1F;
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for (unsigned int i = 0; i < ROUNDS; ++i)
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{
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m_rk[i] = m_t[0];
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constant &= 0xFFFC;
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constant |= sequence & 1;
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sequence >>= 1;
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SIMECK_Encryption(static_cast<word16>(constant), m_t[1], m_t[0]);
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// rotate the LFSR of m_t
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m_t[4] = m_t[1];
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m_t[1] = m_t[2];
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m_t[2] = m_t[3];
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m_t[3] = m_t[4];
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}
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}
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void SIMECK32::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word16, BigEndian> iblock(inBlock);
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iblock(m_t[1])(m_t[0]);
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for (int idx = 0; idx < ROUNDS; ++idx)
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SIMECK_Encryption(m_rk[idx], m_t[1], m_t[0]);
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PutBlock<word16, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_t[1])(m_t[0]);
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}
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void SIMECK32::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word16, BigEndian> iblock(inBlock);
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iblock(m_t[0])(m_t[1]);
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for (int idx = ROUNDS - 1; idx >= 0; --idx)
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SIMECK_Encryption(m_rk[idx], m_t[1], m_t[0]);
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PutBlock<word16, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_t[0])(m_t[1]);
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}
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std::string SIMECK64::Base::AlgorithmProvider() const
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{
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return "C++";
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}
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void SIMECK64::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms)
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{
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CRYPTOPP_UNUSED(params);
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CRYPTOPP_UNUSED(keyLength);
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GetBlock<word32, BigEndian> kblock(userKey);
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kblock(m_t[3])(m_t[2])(m_t[1])(m_t[0]);
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word64 constant = W64LIT(0xFFFFFFFC);
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word64 sequence = W64LIT(0x938BCA3083F);
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for (unsigned int i = 0; i < ROUNDS; ++i)
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{
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m_rk[i] = m_t[0];
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constant &= W64LIT(0xFFFFFFFC);
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constant |= sequence & 1;
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sequence >>= 1;
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SIMECK_Encryption(static_cast<word32>(constant), m_t[1], m_t[0]);
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// rotate the LFSR of m_t
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m_t[4] = m_t[1];
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m_t[1] = m_t[2];
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m_t[2] = m_t[3];
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m_t[3] = m_t[4];
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}
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}
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void SIMECK64::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word32, BigEndian> iblock(inBlock);
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iblock(m_t[1])(m_t[0]);
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for (int idx = 0; idx < ROUNDS; ++idx)
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SIMECK_Encryption(m_rk[idx], m_t[1], m_t[0]);
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PutBlock<word32, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_t[1])(m_t[0]);
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}
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void SIMECK64::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word32, BigEndian> iblock(inBlock);
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iblock(m_t[0])(m_t[1]);
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for (int idx = ROUNDS - 1; idx >= 0; --idx)
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SIMECK_Encryption(m_rk[idx], m_t[1], m_t[0]);
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PutBlock<word32, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_t[0])(m_t[1]);
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}
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NAMESPACE_END
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