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/*
* BIRD Library -- SHA-256 and SHA-224 Hash Functions,
* HMAC-SHA-256 and HMAC-SHA-224 Functions
*
* (c) 2015 CZ.NIC z.s.p.o.
*
* Based on the code from libgcrypt-1.6.0, which is
* (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_SHA256_H_
#define _BIRD_SHA256_H_
#include "nest/bird.h"
#define SHA224_SIZE 28
#define SHA224_HEX_SIZE 57
#define SHA224_BLOCK_SIZE 64
#define SHA256_SIZE 32
#define SHA256_HEX_SIZE 65
#define SHA256_BLOCK_SIZE 64
struct sha256_context {
u32 h0,h1,h2,h3,h4,h5,h6,h7;
byte buf[128]; /* 128 is for SHA384 and SHA512 support, otherwise for SHA224 and SHA256 is 64 enough */
u32 nblocks;
u32 nblocks_high;
int count;
u32 blocksize;
uint (*transform)(void *c, const byte *blks, size_t nblks);
};
#define sha224_context sha256_context /* aliasing 'struct sha224_context' to 'struct sha256_context' */
void sha256_init(struct sha256_context *ctx);
void sha224_init(struct sha224_context *ctx);
void sha256_update(struct sha256_context *ctx, const byte *in_buf, size_t in_len);
static inline void sha224_update(struct sha224_context *ctx, const byte *in_buf, size_t in_len)
{
sha256_update(ctx, in_buf, in_len);
}
byte* sha256_final(struct sha256_context *ctx);
static inline byte* sha224_final(struct sha224_context *ctx)
{
return sha256_final(ctx);
}
/*
* HMAC-SHA256, HMAC-SHA224
*/
struct sha256_hmac_context
{
struct sha256_context ictx;
struct sha256_context octx;
};
#define sha224_hmac_context sha256_hmac_context /* aliasing 'struct sha224_hmac_context' to 'struct sha256_hmac_context' */
void sha256_hmac_init(struct sha256_hmac_context *ctx, const byte *key, size_t keylen);
void sha224_hmac_init(struct sha224_hmac_context *ctx, const byte *key, size_t keylen);
void sha256_hmac_update(struct sha256_hmac_context *ctx, const byte *buf, size_t buflen);
void sha224_hmac_update(struct sha224_hmac_context *ctx, const byte *buf, size_t buflen);
byte *sha256_hmac_final(struct sha256_hmac_context *ctx);
byte *sha224_hmac_final(struct sha224_hmac_context *ctx);
#endif /* _BIRD_SHA256_H_ */
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