/src/dropbear/libtomcrypt/src/stream/chacha/chacha_keystream.c
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1 | | /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
2 | | * |
3 | | * LibTomCrypt is a library that provides various cryptographic |
4 | | * algorithms in a highly modular and flexible manner. |
5 | | * |
6 | | * The library is free for all purposes without any express |
7 | | * guarantee it works. |
8 | | */ |
9 | | |
10 | | /* The implementation is based on: |
11 | | * chacha-ref.c version 20080118 |
12 | | * Public domain from D. J. Bernstein |
13 | | */ |
14 | | |
15 | | #include "tomcrypt.h" |
16 | | |
17 | | #ifdef LTC_CHACHA |
18 | | |
19 | | /** |
20 | | Generate a stream of random bytes via ChaCha |
21 | | @param st The ChaCha20 state |
22 | | @param out [out] The output buffer |
23 | | @param outlen The output length |
24 | | @return CRYPT_OK on success |
25 | | */ |
26 | | int chacha_keystream(chacha_state *st, unsigned char *out, unsigned long outlen) |
27 | 255k | { |
28 | 255k | if (outlen == 0) return CRYPT_OK; /* nothing to do */ |
29 | 255k | LTC_ARGCHK(out != NULL); |
30 | 255k | XMEMSET(out, 0, outlen); |
31 | 255k | return chacha_crypt(st, out, outlen, out); |
32 | 255k | } |
33 | | |
34 | | #endif |
35 | | |
36 | | /* ref: $Format:%D$ */ |
37 | | /* git commit: $Format:%H$ */ |
38 | | /* commit time: $Format:%ai$ */ |