Mercurial > dropbear
comparison cfb_start.c @ 3:7faae8f46238 libtomcrypt-orig
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| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Mon, 31 May 2004 18:25:41 +0000 |
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| children |
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| -1:000000000000 | 3:7faae8f46238 |
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| 1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis | |
| 2 * | |
| 3 * LibTomCrypt is a library that provides various cryptographic | |
| 4 * algorithms in a highly modular and flexible manner. | |
| 5 * | |
| 6 * The library is free for all purposes without any express | |
| 7 * guarantee it works. | |
| 8 * | |
| 9 * Tom St Denis, [email protected], http://libtomcrypt.org | |
| 10 */ | |
| 11 #include "mycrypt.h" | |
| 12 | |
| 13 #ifdef CFB | |
| 14 | |
| 15 int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key, | |
| 16 int keylen, int num_rounds, symmetric_CFB *cfb) | |
| 17 { | |
| 18 int x, err; | |
| 19 | |
| 20 _ARGCHK(IV != NULL); | |
| 21 _ARGCHK(key != NULL); | |
| 22 _ARGCHK(cfb != NULL); | |
| 23 | |
| 24 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { | |
| 25 return err; | |
| 26 } | |
| 27 | |
| 28 | |
| 29 /* copy data */ | |
| 30 cfb->cipher = cipher; | |
| 31 cfb->blocklen = cipher_descriptor[cipher].block_length; | |
| 32 for (x = 0; x < cfb->blocklen; x++) | |
| 33 cfb->IV[x] = IV[x]; | |
| 34 | |
| 35 /* init the cipher */ | |
| 36 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) { | |
| 37 return err; | |
| 38 } | |
| 39 | |
| 40 /* encrypt the IV */ | |
| 41 cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key); | |
| 42 cfb->padlen = 0; | |
| 43 | |
| 44 return CRYPT_OK; | |
| 45 } | |
| 46 | |
| 47 #endif |