diff options
| -rw-r--r-- | update.c | 25 |
1 files changed, 16 insertions, 9 deletions
@@ -10,22 +10,29 @@ * @param msglen The length of the message */ void -libsha2_update(struct libsha2_state *restrict state, const char *restrict message, size_t msglen) /* TODO avoid coping */ +libsha2_update(struct libsha2_state *restrict state, const char *restrict message, size_t msglen) { - size_t n, off, mlen; + size_t n, off; + off = (state->message_size / 8) % state->chunk_size; + state->message_size += msglen; msglen /= 8; - mlen = state->message_size / 8; - while (msglen) { - off = mlen % state->chunk_size; - n = state->chunk_size - off; - n = n < msglen ? n : msglen; + if (off) { + n = msglen < state->chunk_size - off ? msglen : state->chunk_size - off; memcpy(state->chunk + off, message, n); if (off + n == state->chunk_size) libsha2_process(state, state->chunk); - message += n, mlen += n, msglen -= n; + message += n; + msglen -= n; } - state->message_size = mlen * 8; + while (msglen >= state->chunk_size) { + libsha2_process(state, (const unsigned char *)message); + message += state->chunk_size; + msglen -= state->chunk_size; + } + + if (msglen) + memcpy(state->chunk, message, msglen); } |