96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
#ifndef _SHA256_H_
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#define _SHA256_H_
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#include <stddef.h>
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#include <stdint.h>
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/*
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* Use #defines in order to avoid namespace collisions with anyone else's
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* SHA256 code (e.g., the code in OpenSSL).
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*/
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#define SHA256_Init libcperciva_SHA256_Init
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#define SHA256_Update libcperciva_SHA256_Update
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#define SHA256_Final libcperciva_SHA256_Final
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#define SHA256_Buf libcperciva_SHA256_Buf
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#define SHA256_CTX libcperciva_SHA256_CTX
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#define HMAC_SHA256_Init libcperciva_HMAC_SHA256_Init
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#define HMAC_SHA256_Update libcperciva_HMAC_SHA256_Update
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#define HMAC_SHA256_Final libcperciva_HMAC_SHA256_Final
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#define HMAC_SHA256_Buf libcperciva_HMAC_SHA256_Buf
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#define HMAC_SHA256_CTX libcperciva_HMAC_SHA256_CTX
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/* Context structure for SHA256 operations. */
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typedef struct {
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uint32_t state[8];
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uint64_t count;
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uint8_t buf[64];
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} SHA256_CTX;
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/**
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* SHA256_Init(ctx):
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* Initialize the SHA256 context ${ctx}.
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*/
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void SHA256_Init(SHA256_CTX *);
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/**
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* SHA256_Update(ctx, in, len):
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* Input ${len} bytes from ${in} into the SHA256 context ${ctx}.
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*/
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void SHA256_Update(SHA256_CTX *, const void *, size_t);
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/**
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* SHA256_Final(digest, ctx):
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* Output the SHA256 hash of the data input to the context ${ctx} into the
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* buffer ${digest}.
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*/
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void SHA256_Final(uint8_t[32], SHA256_CTX *);
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/**
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* SHA256_Buf(in, len, digest):
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* Compute the SHA256 hash of ${len} bytes from $in} and write it to ${digest}.
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*/
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void SHA256_Buf(const void *, size_t, uint8_t[32]);
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/* Context structure for HMAC-SHA256 operations. */
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typedef struct {
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SHA256_CTX ictx;
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SHA256_CTX octx;
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} HMAC_SHA256_CTX;
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/**
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* HMAC_SHA256_Init(ctx, K, Klen):
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* Initialize the HMAC-SHA256 context ${ctx} with ${Klen} bytes of key from
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* ${K}.
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*/
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void HMAC_SHA256_Init(HMAC_SHA256_CTX *, const void *, size_t);
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/**
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* HMAC_SHA256_Update(ctx, in, len):
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* Input ${len} bytes from ${in} into the HMAC-SHA256 context ${ctx}.
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*/
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void HMAC_SHA256_Update(HMAC_SHA256_CTX *, const void *, size_t);
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/**
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* HMAC_SHA256_Final(digest, ctx):
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* Output the HMAC-SHA256 of the data input to the context ${ctx} into the
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* buffer ${digest}.
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*/
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void HMAC_SHA256_Final(uint8_t[32], HMAC_SHA256_CTX *);
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/**
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* HMAC_SHA256_Buf(K, Klen, in, len, digest):
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* Compute the HMAC-SHA256 of ${len} bytes from ${in} using the key ${K} of
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* length ${Klen}, and write the result to ${digest}.
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*/
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void HMAC_SHA256_Buf(const void *, size_t, const void *, size_t, uint8_t[32]);
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/**
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* PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
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* Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
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* write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
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*/
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void PBKDF2_SHA256(const uint8_t *, size_t, const uint8_t *, size_t,
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uint64_t, uint8_t *, size_t);
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#endif /* !_SHA256_H_ */
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