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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Marshal a state into a buffer
*
* @param state The state to marshal
* @param buf Output buffer, `NULL` to only return the required size
* @return The number of bytes marshalled to `buf`
*/
size_t
libsha2_marshal(const struct libsha2_state *restrict state, char *restrict buf)
{
size_t off = 0;
if (buf)
*(int *)buf = 0; /* version */
off += sizeof(int);
if (buf)
*(enum libsha2_algorithm *)&buf[off] = state->algorithm;
off += sizeof(enum libsha2_algorithm);
if (buf)
*(size_t *)&buf[off] = state->message_size;
off += sizeof(size_t);
if (state->algorithm <= LIBSHA2_256) {
if (buf)
memcpy(&buf[off], state->k.b32, sizeof(state->k.b32));
off += sizeof(state->k.b32);
if (buf)
memcpy(&buf[off], state->w.b32, sizeof(state->w.b32));
off += sizeof(state->w.b32);
if (buf)
memcpy(&buf[off], state->h.b32, sizeof(state->h.b32));
off += sizeof(state->h.b32);
} else {
if (buf)
memcpy(&buf[off], state->k.b64, sizeof(state->k.b64));
off += sizeof(state->k.b64);
if (buf)
memcpy(&buf[off], state->w.b64, sizeof(state->w.b64));
off += sizeof(state->w.b64);
if (buf)
memcpy(&buf[off], state->h.b64, sizeof(state->h.b64));
off += sizeof(state->h.b64);
}
if (buf)
*(size_t *)&buf[off] = state->chunk_size;
off += sizeof(size_t);
if (buf)
memcpy(&buf[off], state->chunk, (state->message_size / 8) % state->chunk_size);
off += (state->message_size / 8) % state->chunk_size;
return off;
}
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