Function generate_cipher_stream

common/sphinx.c:236–241

* Generate a pseudo-random byte stream of length `dstlen` from key `k` and * store it in `dst`. `dst must be at least `dstlen` bytes long. */

 * store it in `dst`. `dst must be at least `dstlen` bytes long.
 */
static void generate_cipher_stream(void *dst, const struct secret *k, size_t dstlen)
{
	const u8 nonce[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

	crypto_stream_chacha20(dst, dstlen, nonce, k->data);
}

/* xor cipher stream into dst */
static void xor_cipher_stream(void *dst, const struct secret *k, size_t dstlen)