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