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Import code from previous AssetBuilder version

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Jan
2019-09-24 10:45:09 +02:00
parent 5609557516
commit 0d8432d4f7
919 changed files with 154412 additions and 26 deletions
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67
thirdparty/libtomcrypt/stream/chacha/chacha_setup.c vendored Normal file
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
/* The implementation is based on:
* chacha-ref.c version 20080118
* Public domain from D. J. Bernstein
*/
#include "tomcrypt.h"
#ifdef LTC_CHACHA
static const char * const sigma = "expand 32-byte k";
static const char * const tau = "expand 16-byte k";
/**
Initialize an ChaCha context (only the key)
@param st [out] The destination of the ChaCha state
@param key The secret key
@param keylen The length of the secret key (octets)
@param rounds Number of rounds (e.g. 20 for ChaCha20)
@return CRYPT_OK if successful
*/
int chacha_setup(chacha_state *st, const unsigned char *key, unsigned long keylen, int rounds)
{
const char *constants;
LTC_ARGCHK(st != NULL);
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(keylen == 32 || keylen == 16);
if (rounds == 0) rounds = 20;
LOAD32L(st->input[4], key + 0);
LOAD32L(st->input[5], key + 4);
LOAD32L(st->input[6], key + 8);
LOAD32L(st->input[7], key + 12);
if (keylen == 32) { /* 256bit */
key += 16;
constants = sigma;
} else { /* 128bit */
constants = tau;
}
LOAD32L(st->input[8], key + 0);
LOAD32L(st->input[9], key + 4);
LOAD32L(st->input[10], key + 8);
LOAD32L(st->input[11], key + 12);
LOAD32L(st->input[0], constants + 0);
LOAD32L(st->input[1], constants + 4);
LOAD32L(st->input[2], constants + 8);
LOAD32L(st->input[3], constants + 12);
st->rounds = rounds; /* e.g. 20 for chacha20 */
st->ivlen = 0; /* will be set later by chacha_ivctr(32|64) */
return CRYPT_OK;
}
#endif
/* ref: HEAD -> master, tag: v1.18.2 */
/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
/* commit time: 2018-07-01 22:49:01 +0200 */