Thread: [Opentnl-cvs] tnl/libtomcrypt/modes/cbc cbc_decrypt.c,NONE,1.1 cbc_done.c,NONE,1.1 cbc_encrypt.c,NON
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From: Mark F. <mar...@us...> - 2005-04-28 17:28:12
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Update of /cvsroot/opentnl/tnl/libtomcrypt/modes/cbc In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv26694/libtomcrypt/modes/cbc Added Files: cbc_decrypt.c cbc_done.c cbc_encrypt.c cbc_getiv.c cbc_setiv.c cbc_start.c Log Message: Updated to libtomcrypt 1.0.2 Not tested on linux or OS X --- NEW FILE: cbc_getiv.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_getiv.c CBC implementation, get IV, Tom St Denis */ #ifdef CBC /** Get the current initial vector @param IV [out] The destination of the initial vector @param len [in/out] The max size and resulting size of the initial vector @param cbc The CBC state @return CRYPT_OK if successful */ int cbc_getiv(unsigned char *IV, unsigned long *len, symmetric_CBC *cbc) { LTC_ARGCHK(IV != NULL); LTC_ARGCHK(len != NULL); LTC_ARGCHK(cbc != NULL); if ((unsigned long)cbc->blocklen > *len) { return CRYPT_BUFFER_OVERFLOW; } XMEMCPY(IV, cbc->IV, cbc->blocklen); *len = cbc->blocklen; return CRYPT_OK; } #endif --- NEW FILE: cbc_done.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_done.c CBC implementation, finish chain, Tom St Denis */ #ifdef CBC /** Terminate the chain @param cbc The CBC chain to terminate @return CRYPT_OK on success */ int cbc_done(symmetric_CBC *cbc) { int err; LTC_ARGCHK(cbc != NULL); if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { return err; } cipher_descriptor[cbc->cipher].done(&cbc->key); return CRYPT_OK; } #endif --- NEW FILE: cbc_encrypt.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_encrypt.c CBC implementation, encrypt block, Tom St Denis */ #ifdef CBC /** CBC encrypt @param pt Plaintext @param ct [out] Ciphertext @param len The number of bytes to process (must be multiple of block length) @param cbc CBC state @return CRYPT_OK if successful */ int cbc_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc) { int x, err; LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_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; } if (len % cbc->blocklen) { return CRYPT_INVALID_ARG; } #ifdef LTC_FAST if (len % sizeof(LTC_FAST_TYPE)) { return CRYPT_INVALID_ARG; } #endif if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) { cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key); } else { while (len) { /* xor IV against plaintext */ #if defined(LTC_FAST) for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)pt + x)); } #else for (x = 0; x < cbc->blocklen; x++) { cbc->IV[x] ^= pt[x]; } #endif /* encrypt */ cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key); /* store IV [ciphertext] for a future block */ #if defined(LTC_FAST) for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); } #else for (x = 0; x < cbc->blocklen; x++) { cbc->IV[x] = ct[x]; } #endif ct += cbc->blocklen; pt += cbc->blocklen; len -= cbc->blocklen; } } return CRYPT_OK; } #endif --- NEW FILE: cbc_decrypt.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_decrypt.c CBC implementation, encrypt block, Tom St Denis */ #ifdef CBC /** CBC decrypt @param ct Ciphertext @param pt [out] Plaintext @param len The number of bytes to process (must be multiple of block length) @param cbc CBC state @return CRYPT_OK if successful */ int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CBC *cbc) { int x, err; unsigned char tmp[16]; #ifdef LTC_FAST LTC_FAST_TYPE tmpy; #else unsigned char tmpy; #endif LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_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; } if (len % cbc->blocklen) { return CRYPT_INVALID_ARG; } #ifdef LTC_FAST if (len % sizeof(LTC_FAST_TYPE)) { return CRYPT_INVALID_ARG; } #endif if (cipher_descriptor[cbc->cipher].accel_cbc_decrypt != NULL) { cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key); } else { while (len) { /* decrypt */ cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key); /* xor IV against plaintext */ #if defined(LTC_FAST) for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { tmpy = *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^ *((LTC_FAST_TYPE*)((unsigned char *)tmp + x)); *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) = tmpy; } #else for (x = 0; x < cbc->blocklen; x++) { tmpy = tmp[x] ^ cbc->IV[x]; cbc->IV[x] = ct[x]; pt[x] = tmpy; } #endif ct += cbc->blocklen; pt += cbc->blocklen; len -= cbc->blocklen; } } return CRYPT_OK; } #endif --- NEW FILE: cbc_setiv.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_setiv.c CBC implementation, set IV, Tom St Denis */ #ifdef CBC /** Set an initial vector @param IV The initial vector @param len The length of the vector (in octets) @param cbc The CBC state @return CRYPT_OK if successful */ int cbc_setiv(const unsigned char *IV, unsigned long len, symmetric_CBC *cbc) { LTC_ARGCHK(IV != NULL); LTC_ARGCHK(cbc != NULL); if (len != (unsigned long)cbc->blocklen) { return CRYPT_INVALID_ARG; } XMEMCPY(cbc->IV, IV, len); return CRYPT_OK; } #endif --- NEW FILE: cbc_start.c --- /* 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, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file cbc_start.c CBC implementation, start chain, Tom St Denis */ #ifdef CBC /** Initialize a CBC 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 cbc The CBC state to initialize @return CRYPT_OK if successful */ int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key, int keylen, int num_rounds, symmetric_CBC *cbc) { int x, err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(cbc != NULL); /* bad param? */ if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } /* setup cipher */ if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) { return err; } /* copy IV */ cbc->blocklen = cipher_descriptor[cipher].block_length; cbc->cipher = cipher; for (x = 0; x < cbc->blocklen; x++) { cbc->IV[x] = IV[x]; } return CRYPT_OK; } #endif |