subsurface/core/sha1.h

/*
 * SHA1 routine optimized to do word accesses rather than byte accesses,
 * and to avoid unnecessary copies into the context array.
 *
 * This was initially based on the Mozilla SHA1 implementation, although
 * none of the original Mozilla code remains.
 */
#ifndef SHA1_H
#define SHA1_H

#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
	unsigned long long size;
	unsigned int H[5];
	unsigned int W[16];
} blk_SHA_CTX;

void blk_SHA1_Init(blk_SHA_CTX *ctx);
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *dataIn, unsigned long len);
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx);

/* Make us use the standard names */
#define SHA_CTX blk_SHA_CTX
#define SHA1_Init blk_SHA1_Init
#define SHA1_Update blk_SHA1_Update
#define SHA1_Final blk_SHA1_Final

/* Helper function that calculates an SHA1 has and returns the first 4 bytes as uint32_t */
uint32_t SHA1_uint32(const void *dataIn, unsigned long len);

#ifdef __cplusplus
}
#endif

#endif // SHA1_H