diff options
author | Matt Johnston <matt@ucc.asn.au> | 2006-03-08 13:23:58 +0000 |
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committer | Matt Johnston <matt@ucc.asn.au> | 2006-03-08 13:23:58 +0000 |
commit | 6ae3a09ef33b62811a7f60a1f97dcb89907c1ac1 (patch) | |
tree | 37e84722c5b30bbfc86947bee260473d4604b616 /libtomcrypt/src/modes/cfb/cfb_start.c | |
parent | 33defd1f9b6c4889fe5b075e6abb0b24c00f3a59 (diff) | |
parent | 8608a8e64c1aeda096867f43f89e29e1aee207ae (diff) |
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
--HG--
extra : convert_revision : dc4809882e1b9f2dcd3f8bbe38c74a0a52c39ce4
Diffstat (limited to 'libtomcrypt/src/modes/cfb/cfb_start.c')
-rw-r--r-- | libtomcrypt/src/modes/cfb/cfb_start.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/libtomcrypt/src/modes/cfb/cfb_start.c b/libtomcrypt/src/modes/cfb/cfb_start.c new file mode 100644 index 0000000..755e173 --- /dev/null +++ b/libtomcrypt/src/modes/cfb/cfb_start.c @@ -0,0 +1,67 @@ +/* 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, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file cfb_start.c + CFB implementation, start chain, Tom St Denis +*/ + + +#ifdef CFB + +/** + 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 */ + cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key); + cfb->padlen = 0; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_start.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ |