Mercurial > dropbear
view cbc_encrypt.c @ 144:7ed585a2c53b libtomcrypt
propagate of 3f8f752126017cbe7d93c4086c27a91550df745f and 747ebf284d40a15b338e5a5c7730ecec6eade3d7 from branch 'au.asn.ucc.matt.ltc-orig' to 'au.asn.ucc.matt.ltc-db'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 19 Dec 2004 11:47:33 +0000 |
parents | d7da3b1e1540 |
children |
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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.org */ #include "mycrypt.h" #ifdef CBC int cbc_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_CBC *cbc) { int x, err; unsigned char tmp[MAXBLOCKSIZE]; _ARGCHK(pt != NULL); _ARGCHK(ct != NULL); _ARGCHK(cbc != NULL); if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { return err; } /* is blocklen valid? */ if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) { return CRYPT_INVALID_ARG; } /* xor IV against plaintext */ for (x = 0; x < cbc->blocklen; x++) { tmp[x] = pt[x] ^ cbc->IV[x]; } /* encrypt */ cipher_descriptor[cbc->cipher].ecb_encrypt(tmp, ct, &cbc->key); /* store IV [ciphertext] for a future block */ for (x = 0; x < cbc->blocklen; x++) { cbc->IV[x] = ct[x]; } #ifdef CLEAN_STACK zeromem(tmp, sizeof(tmp)); #endif return CRYPT_OK; } #endif