Function blake2s_update

freebsd/contrib/libb2/blake2s-ref.c:291–319

int blake2s_update( blake2s_state *S, const uint8_t *in, size_t inlen )
{
  while( inlen > 0 )
  {
    uint32_t left = S->buflen;
    uint32_t fill = 2 * BLAKE2S_BLOCKBYTES - left;

    if( inlen > fill )
    {
      memcpy( S->buf + left, in, fill ); // Fill buffer
      S->buflen += fill;
      blake2s_increment_counter( S, BLAKE2S_BLOCKBYTES );
      blake2s_compress( S, S->buf ); // Compress
      memcpy( S->buf, S->buf + BLAKE2S_BLOCKBYTES, BLAKE2S_BLOCKBYTES ); // Shift buffer left
      S->buflen -= BLAKE2S_BLOCKBYTES;
      in += fill;
      inlen -= fill;
    }
    else // inlen <= fill
    {
      memcpy( S->buf + left, in, inlen );
      S->buflen += ( uint32_t ) inlen; // Be lazy, do not compress
      in += inlen;
      inlen -= inlen;
    }
  }

  return 0;
}

int blake2s_final( blake2s_state *S, uint8_t *out, size_t outlen )
{