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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Unmarshal an HMAC state from a buffer
*
* @param state Output parameter for the unmarshalled state
* @param buf The buffer from which the state shall be unmarshalled
* @param bufsize The maximum number of bytes that can be unmarshalled
* @return The number of read bytes, 0 on failure
*/
size_t
libsha2_hmac_unmarshal(struct libsha2_hmac_state *restrict state, const void *restrict buf_, size_t bufsize)
{
const char *restrict buf = buf_;
size_t off = 0;
size_t r;
if (bufsize < sizeof(int)) {
errno = EINVAL;
return 0;
}
if (*(const int *)buf) { /* version */
errno = EINVAL;
return 0;
}
off += sizeof(int);
r = libsha2_unmarshal(&state->sha2_state, &buf[off], bufsize - off);
if (!r)
return 0;
off += r;
if (bufsize - off < sizeof(size_t) + sizeof(unsigned char) + 2 * state->sha2_state.chunk_size) {
errno = EINVAL;
return 0;
}
state->outsize = *(const size_t *)&buf[off];
off += sizeof(size_t);
state->inited = *(const unsigned char *)&buf[off];
off += sizeof(unsigned char);
memcpy(state->ipad, &buf[off], state->sha2_state.chunk_size);
off += state->sha2_state.chunk_size;
memcpy(state->opad, &buf[off], state->sha2_state.chunk_size);
off += state->sha2_state.chunk_size;
return off;
}
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