Add sideband implementation.

[paraslash.git] / crypt.c

diff --git a/crypt.c b/crypt.c
index f33f769f6f035c18946c21fea064b37052802583..b754c0919e6fbccca77c0d662bddf59c6351fca6 100644 (file)
--- a/crypt.c
+++ b/crypt.c
@@ -317,6 +317,23 @@ int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
        return ret;
 }
 
+void sc_crypt(struct stream_cipher *sc, struct iovec *src, struct iovec *dst)
+{
+       RC4_KEY *key = &sc->key;
+
+       *dst = (typeof(*dst)) {
+               /*
+                * Add one for the terminating zero byte. Integer overflow is
+                * no problem here as para_malloc() aborts when given a zero
+                * size argument.
+                */
+               .iov_base = para_malloc(src->iov_len + 1),
+               .iov_len = src->iov_len
+       };
+       RC4(key, src->iov_len, src->iov_base, dst->iov_base);
+       ((char *)dst->iov_base)[dst->iov_len] = '\0';
+}
+
 void hash_function(const char *data, unsigned long len, unsigned char *hash)
 {
        SHA_CTX c;