Mercurial > dropbear
view libtomcrypt/src/modes/cbc/cbc_start.c @ 1552:e46f7f1da56a
CHANGES for 2018.76
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Tue, 27 Feb 2018 22:14:04 +0800 |
parents | 6dba84798cd5 |
children |
line wrap: on
line source
/* 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. */ #include "tomcrypt.h" /** @file cbc_start.c CBC implementation, start chain, Tom St Denis */ #ifdef LTC_CBC_MODE /** Initialize a CBC context @param cipher The index of the cipher desired @param IV The initialization vector @param key The secret key @param keylen The length of the secret key (octets) @param num_rounds Number of rounds in the cipher desired (0 for default) @param cbc The CBC state to initialize @return CRYPT_OK if successful */ int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key, int keylen, int num_rounds, symmetric_CBC *cbc) { int x, err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(cbc != NULL); /* bad param? */ if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } /* setup cipher */ if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) { return err; } /* copy IV */ cbc->blocklen = cipher_descriptor[cipher].block_length; cbc->cipher = cipher; for (x = 0; x < cbc->blocklen; x++) { cbc->IV[x] = IV[x]; } return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */