Mercurial > dropbear
view libtomcrypt/src/modes/ecb/ecb_decrypt.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 ecb_decrypt.c ECB implementation, decrypt a block, Tom St Denis */ #ifdef LTC_ECB_MODE /** ECB decrypt @param ct Ciphertext @param pt [out] Plaintext @param len The number of octets to process (must be multiple of the cipher block size) @param ecb ECB state @return CRYPT_OK if successful */ int ecb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_ECB *ecb) { int err; LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_ARGCHK(ecb != NULL); if ((err = cipher_is_valid(ecb->cipher)) != CRYPT_OK) { return err; } if (len % cipher_descriptor[ecb->cipher].block_length) { return CRYPT_INVALID_ARG; } /* check for accel */ if (cipher_descriptor[ecb->cipher].accel_ecb_decrypt != NULL) { return cipher_descriptor[ecb->cipher].accel_ecb_decrypt(ct, pt, len / cipher_descriptor[ecb->cipher].block_length, &ecb->key); } else { while (len) { if ((err = cipher_descriptor[ecb->cipher].ecb_decrypt(ct, pt, &ecb->key)) != CRYPT_OK) { return err; } pt += cipher_descriptor[ecb->cipher].block_length; ct += cipher_descriptor[ecb->cipher].block_length; len -= cipher_descriptor[ecb->cipher].block_length; } } return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/modes/ecb/ecb_decrypt.c,v $ */ /* $Revision: 1.9 $ */ /* $Date: 2006/06/29 01:51:34 $ */