-/**
- * Compute the hash of the given input data.
- *
- * \param data Pointer to the data to compute the hash value from.
- * \param len The length of \a data in bytes.
- * \param hash Result pointer.
- *
- * \a hash must point to an area at least \p HASH_SIZE bytes large.
- *
- * \sa sha(3), openssl(1).
- * */
+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';
+}
+