+int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
+ size_t size)
+{
+ unsigned char *tmp = para_malloc(ROUND_UP(size, RC4_ALIGN));
+ ssize_t ret = recv(scc->fd, tmp, size, 0);
+
+ if (ret > 0)
+ RC4(&scc->recv->key, ret, tmp, (unsigned char *)buf);
+ else if (ret < 0)
+ ret = -ERRNO_TO_PARA_ERROR(errno);
+ free(tmp);
+ return ret;
+}
+
+void sc_crypt(struct stream_cipher *sc, struct iovec *src, struct iovec *dst)
+{
+ size_t len = src->iov_len, l1, l2;
+ RC4_KEY *key = &sc->key;
+
+ assert(len > 0);
+ assert(len < ((typeof(src->iov_len))-1) / 2);
+ l1 = ROUND_DOWN(len, RC4_ALIGN);
+ l2 = ROUND_UP(len, RC4_ALIGN);
+
+ *dst = (typeof(*dst)) {
+ /* Add one for the terminating zero byte. */
+ .iov_base = para_malloc(l2 + 1),
+ .iov_len = len
+ };
+ RC4(key, l1, src->iov_base, dst->iov_base);
+ if (len > l1) {
+ unsigned char remainder[RC4_ALIGN] = "";
+ memcpy(remainder, src->iov_base + l1, len - l1);
+ RC4(key, len - l1, remainder, dst->iov_base + l1);
+ }
+ ((char *)dst->iov_base)[len] = '\0';
+}
+
+void hash_function(const char *data, unsigned long len, unsigned char *hash)
+{
+ SHA_CTX c;
+ SHA1_Init(&c);
+ SHA1_Update(&c, data, len);
+ SHA1_Final(hash, &c);
+}