Mercurial > dropbear
view libtomcrypt/src/modes/cfb/cfb_start.c @ 436:7282370416a0
Improve known_hosts checking.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 22 Feb 2007 15:29:32 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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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. * * Tom St Denis, [email protected], http://libtomcrypt.com */ #include "tomcrypt.h" /** @file cfb_start.c CFB implementation, start chain, Tom St Denis */ #ifdef LTC_CFB_MODE /** Initialize a CFB context @param cipher The index of the cipher desired @param IV The initial 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 cfb The CFB state to initialize @return CRYPT_OK if successful */ int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key, int keylen, int num_rounds, symmetric_CFB *cfb) { int x, err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(cfb != NULL); if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } /* copy data */ cfb->cipher = cipher; cfb->blocklen = cipher_descriptor[cipher].block_length; for (x = 0; x < cfb->blocklen; x++) cfb->IV[x] = IV[x]; /* init the cipher */ if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) { return err; } /* encrypt the IV */ cfb->padlen = 0; return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key); } #endif /* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_start.c,v $ */ /* $Revision: 1.6 $ */ /* $Date: 2006/06/29 01:51:34 $ */