sha2.h

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#ifndef __SHA2_H__
#define __SHA2_H__

#include <stdint.h>
#include <stddef.h>

#define SHA256_BLOCK_LENGTH 64
#define SHA256_DIGEST_LENGTH 32
#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
#define SHA512_BLOCK_LENGTH 128
#define SHA512_DIGEST_LENGTH 64
#define SHA512_DIGEST_STRING_LENGTH (SHA512_DIGEST_LENGTH * 2 + 1)

typedef struct _SHA256_CTX
{
    uint32_t state[8];
    uint64_t bitcount;
    uint8_t buffer[SHA256_BLOCK_LENGTH];
} SHA256_CTX;
typedef struct _SHA512_CTX
{
    uint64_t state[8];
    uint64_t bitcount[2];
    uint8_t buffer[SHA512_BLOCK_LENGTH];
} SHA512_CTX;

void sha256_Init(SHA256_CTX*);
void sha256_Update(SHA256_CTX*, const uint8_t*, size_t);
void sha256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
void sha256_Raw(const uint8_t*, size_t, uint8_t[SHA256_DIGEST_LENGTH]);

void sha512_Init(SHA512_CTX*);
void sha512_Update(SHA512_CTX*, const uint8_t*, size_t);
void sha512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
void sha512_Raw(const uint8_t*, size_t, uint8_t[SHA512_DIGEST_LENGTH]);

void hmac_sha256(const uint8_t* key, const uint32_t keylen, const uint8_t* msg, const uint32_t msglen, uint8_t* hmac);
void hmac_sha512(const uint8_t* key, const uint32_t keylen, const uint8_t* msg, const uint32_t msglen, uint8_t* hmac);
#endif