md5_ctx2hash((md5_hash_t*)dest, &(s->a));
md5_lastBlock(&(s->b), dest, MD5_HASH_BITS);
md5_ctx2hash((md5_hash_t*)dest, &(s->b));
md5_ctx2hash((md5_hash_t*)dest, &(s->a));
md5_lastBlock(&(s->b), dest, MD5_HASH_BITS);
md5_ctx2hash((md5_hash_t*)dest, &(s->b));