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/* See LICENSE file for copyright and license details. */
#include "common.h"
size_t
libsha1_unmarshal(struct libsha1_state *restrict state, const void *restrict buf_, size_t bufsize)
{
const unsigned char *restrict buf = buf_;
size_t off = 0;
int version;
if (bufsize < sizeof(int) + sizeof(enum libsha1_algorithm) + sizeof(size_t)) {
errno = EINVAL;
return 0;
}
memcpy(&version, buf, sizeof(int));
if (version < 0 || version > 1) {
errno = EINVAL;
return 0;
}
off += sizeof(int);
memcpy(&state->algorithm, &buf[off], sizeof(enum libsha1_algorithm));
off += sizeof(enum libsha1_algorithm);
memcpy(&state->message_size, &buf[off], sizeof(size_t));
off += sizeof(size_t);
if (bufsize - off < sizeof(state->w) + sizeof(state->h)) {
errno = EINVAL;
return 0;
}
memset(state->w, 0, sizeof(state->w));
if (version == 0)
off += sizeof(state->w);
memcpy(state->h, &buf[off], sizeof(state->h));
off += sizeof(state->h);
if (bufsize - off < (state->message_size / 8) % sizeof(state->chunk)) {
errno = EINVAL;
return 0;
}
memcpy(state->chunk, &buf[off], (state->message_size / 8) % sizeof(state->chunk));
off += (state->message_size / 8) % sizeof(state->chunk);
return off;
}
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