[Opentnl-cvs] tnl/libtomcrypt/modes/ofb ofb_decrypt.c,NONE,1.1 ofb_done.c,NONE,1.1 ofb_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/ofb In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv26694/libtomcrypt/modes/ofb Added Files: ofb_decrypt.c ofb_done.c ofb_encrypt.c ofb_getiv.c ofb_setiv.c ofb_start.c Log Message: Updated to libtomcrypt 1.0.2 Not tested on linux or OS X --- NEW FILE: ofb_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 ofb_encrypt.c OFB implementation, encrypt data, Tom St Denis */ #ifdef OFB /** OFB encrypt @param pt Plaintext @param ct [out] Ciphertext @param len Length of plaintext (octets) @param ofb OFB state @return CRYPT_OK if successful */ int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb) { int err; LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_ARGCHK(ofb != NULL); if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { return err; } /* is blocklen/padlen valid? */ if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) || ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) { return CRYPT_INVALID_ARG; } while (len-- > 0) { if (ofb->padlen == ofb->blocklen) { cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key); ofb->padlen = 0; } *ct++ = *pt++ ^ ofb->IV[ofb->padlen++]; } return CRYPT_OK; } #endif --- NEW FILE: ofb_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 ofb_start.c OFB implementation, start chain, Tom St Denis */ #ifdef OFB /** Initialize a OFB 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 ofb The OFB state to initialize @return CRYPT_OK if successful */ int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key, int keylen, int num_rounds, symmetric_OFB *ofb) { int x, err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(ofb != NULL); if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } /* copy details */ ofb->cipher = cipher; ofb->blocklen = cipher_descriptor[cipher].block_length; for (x = 0; x < ofb->blocklen; x++) { ofb->IV[x] = IV[x]; } /* init the cipher */ ofb->padlen = ofb->blocklen; return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key); } #endif --- NEW FILE: ofb_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 ofb_done.c OFB implementation, finish chain, Tom St Denis */ #ifdef OFB /** Terminate the chain @param ofb The OFB chain to terminate @return CRYPT_OK on success */ int ofb_done(symmetric_OFB *ofb) { int err; LTC_ARGCHK(ofb != NULL); if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { return err; } cipher_descriptor[ofb->cipher].done(&ofb->key); return CRYPT_OK; } #endif --- NEW FILE: ofb_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 ofb_setiv.c OFB implementation, set IV, Tom St Denis */ #ifdef OFB /** Set an initial vector @param IV The initial vector @param len The length of the vector (in octets) @param ofb The OFB state @return CRYPT_OK if successful */ int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb) { int err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(ofb != NULL); if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { return err; } if (len != (unsigned long)ofb->blocklen) { return CRYPT_INVALID_ARG; } /* force next block */ ofb->padlen = 0; cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key); return CRYPT_OK; } #endif --- NEW FILE: ofb_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 ofb_decrypt.c OFB implementation, decrypt data, Tom St Denis */ #ifdef OFB /** OFB decrypt @param ct Ciphertext @param pt [out] Plaintext @param len Length of ciphertext (octets) @param ofb OFB state @return CRYPT_OK if successful */ int ofb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_OFB *ofb) { LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_ARGCHK(ofb != NULL); return ofb_encrypt(ct, pt, len, ofb); } #endif --- NEW FILE: ofb_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 ofb_getiv.c OFB implementation, get IV, Tom St Denis */ #ifdef OFB /** 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 ofb The OFB state @return CRYPT_OK if successful */ int ofb_getiv(unsigned char *IV, unsigned long *len, symmetric_OFB *ofb) { LTC_ARGCHK(IV != NULL); LTC_ARGCHK(len != NULL); LTC_ARGCHK(ofb != NULL); if ((unsigned long)ofb->blocklen > *len) { return CRYPT_BUFFER_OVERFLOW; } XMEMCPY(IV, ofb->IV, ofb->blocklen); *len = ofb->blocklen; return CRYPT_OK; } #endif |