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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Feed data into the HMAC algorithm and
* get the result
*
* The state of the algorithm will be reset and
* `libsha1_hmac_update` and `libsha1_hmac_update`
* can be called again
*
* @param state The state of the algorithm
* @param data Data to feed into the algorithm
* @param n The number of bytes to feed into the algorithm
* @param output The output buffer for the hash, it will be as
* large as for the underlaying hash algorithm
*/
void
libsha1_hmac_digest(struct libsha1_hmac_state *restrict state, const void *data, size_t n, void *output)
{
if (!state->inited) {
libsha1_init(&state->sha1_state, state->sha1_state.algorithm);
libsha1_update(&state->sha1_state, state->ipad, sizeof(state->sha1_state.chunk) * 8);
}
libsha1_digest(&state->sha1_state, data, n, output);
libsha1_init(&state->sha1_state, state->sha1_state.algorithm);
libsha1_update(&state->sha1_state, state->opad, sizeof(state->sha1_state.chunk) * 8);
libsha1_digest(&state->sha1_state, output, state->outsize, output);
state->inited = 0;
}
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