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, tomstdenis (at) gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 13 /** 14 @file lrw_decrypt.c 15 LRW_MODE implementation, Decrypt blocks, Tom St Denis 16 */ 17 18 #ifdef LTC_LRW_MODE 19 20 /** 21 LRW decrypt blocks 22 @param ct The ciphertext 23 @param pt [out] The plaintext 24 @param len The length in octets, must be a multiple of 16 25 @param lrw The LRW state 26 */ 27 int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw) 28 { 29 int err; 30 31 LTC_ARGCHK(pt != NULL); 32 LTC_ARGCHK(ct != NULL); 33 LTC_ARGCHK(lrw != NULL); 34 35 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) { 36 return err; 37 } 38 39 if (cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) { 40 return cipher_descriptor[lrw->cipher].accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key); 41 } 42 43 return lrw_process(ct, pt, len, LRW_DECRYPT, lrw); 44 } 45 46 47 #endif 48 49 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_decrypt.c,v $ */ 50 /* $Revision: 1.8 $ */ 51 /* $Date: 2006/06/29 01:53:13 $ */ 52
