1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3
4 /* The implementation is based on:
5 * "Salsa20 specification", http://cr.yp.to/snuffle/spec.pdf
6 * and salsa20-ref.c version 20051118
7 * Public domain from D. J. Bernstein
8 */
9
10 #include "tomcrypt_private.h"
11
12 #ifdef LTC_SALSA20
13
14 /**
15 Generate a stream of random bytes via Salsa20
16 @param st The Salsa20 state
17 @param out [out] The output buffer
18 @param outlen The output length
19 @return CRYPT_OK on success
20 */
salsa20_keystream(salsa20_state * st,unsigned char * out,unsigned long outlen)21 int salsa20_keystream(salsa20_state *st, unsigned char *out, unsigned long outlen)
22 {
23 if (outlen == 0) return CRYPT_OK; /* nothing to do */
24 LTC_ARGCHK(out != NULL);
25 XMEMSET(out, 0, outlen);
26 return salsa20_crypt(st, out, outlen, out);
27 }
28
29 #endif
30