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authorMatt Johnston <matt@ucc.asn.au>2006-03-08 13:23:58 +0000
committerMatt Johnston <matt@ucc.asn.au>2006-03-08 13:23:58 +0000
commit6ae3a09ef33b62811a7f60a1f97dcb89907c1ac1 (patch)
tree37e84722c5b30bbfc86947bee260473d4604b616 /libtomcrypt/src/modes/cfb/cfb_start.c
parent33defd1f9b6c4889fe5b075e6abb0b24c00f3a59 (diff)
parent8608a8e64c1aeda096867f43f89e29e1aee207ae (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.c67
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
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+++ b/libtomcrypt/src/modes/cfb/cfb_start.c
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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, 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 $ */