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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Initial state for SHA-0
*/
static const uint32_t H_0[] = {
0, 0, 0, 0, 0
};
/**
* Initial state for SHA_1
*/
static const uint32_t H_1[] = {
0x67452301UL, 0xEFCDAB89UL, 0x98BADCFEUL, 0x10325476UL, 0xC3D2E1F0UL
};
/**
* Initialise a state
*
* @param state The state that should be initialised
* @param algorithm The hashing algorithm
* @return Zero on success, -1 on error
*/
int
libsha1_init(struct libsha1_state *restrict state, enum libsha1_algorithm algorithm)
{
memset(state, 0, sizeof(*state));
state->message_size = 0;
state->algorithm = algorithm;
/* Set initial hash values. */
switch (algorithm) {
case LIBSHA1_0: memcpy(state->h, H_0, sizeof(H_0)); break;
case LIBSHA1_1: memcpy(state->h, H_1, sizeof(H_1)); break;
default:
errno = EINVAL;
return -1;
}
state->chunk_size = 64;
return 0;
}
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