Thread: [Opentnl-cvs] tnl/libtomcrypt/encauth/eax eax_addheader.c,NONE,1.1 eax_decrypt.c,NONE,1.1 eax_decryp
Brought to you by:
mark_frohnmayer,
s_alanet
From: Mark F. <mar...@us...> - 2005-04-28 17:28:03
|
Update of /cvsroot/opentnl/tnl/libtomcrypt/encauth/eax In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv26694/libtomcrypt/encauth/eax Added Files: eax_addheader.c eax_decrypt.c eax_decrypt_verify_memory.c eax_done.c eax_encrypt.c eax_encrypt_authenticate_memory.c eax_init.c eax_test.c Log Message: Updated to libtomcrypt 1.0.2 Not tested on linux or OS X --- NEW FILE: eax_decrypt_verify_memory.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 */ /** @file eax_decrypt_verify_memory.c EAX implementation, decrypt block of memory, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Decrypt a block of memory and verify the provided MAC tag with EAX @param cipher The index of the cipher desired @param key The secret key @param keylen The length of the key (octets) @param nonce The nonce data (use once) for the session @param noncelen The length of the nonce data. @param header The session header data @param headerlen The length of the header (octets) @param ct The ciphertext @param ctlen The length of the ciphertext (octets) @param pt [out] The plaintext @param tag The authentication tag provided by the encoder @param taglen [in/out] The length of the tag (octets) @param stat [out] The result of the decryption (1==valid tag, 0==invalid) @return CRYPT_OK if successful regardless of the resulting tag comparison */ int eax_decrypt_verify_memory(int cipher, const unsigned char *key, unsigned long keylen, const unsigned char *nonce, unsigned long noncelen, const unsigned char *header, unsigned long headerlen, const unsigned char *ct, unsigned long ctlen, unsigned char *pt, unsigned char *tag, unsigned long taglen, int *stat) { int err; eax_state *eax; unsigned char *buf; unsigned long buflen; LTC_ARGCHK(stat != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_ARGCHK(tag != NULL); /* default to zero */ *stat = 0; /* allocate ram */ buf = XMALLOC(taglen); eax = XMALLOC(sizeof(*eax)); if (eax == NULL || buf == NULL) { if (eax != NULL) { XFREE(eax); } if (buf != NULL) { XFREE(buf); } return CRYPT_MEM; } if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = eax_decrypt(eax, ct, pt, ctlen)) != CRYPT_OK) { goto LBL_ERR; } buflen = taglen; if ((err = eax_done(eax, buf, &buflen)) != CRYPT_OK) { goto LBL_ERR; } /* compare tags */ if (buflen >= taglen && memcmp(buf, tag, taglen) == 0) { *stat = 1; } err = CRYPT_OK; LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(buf, taglen); zeromem(eax, sizeof(*eax)); #endif XFREE(eax); XFREE(buf); return err; } #endif --- NEW FILE: eax_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 */ /** @file eax_decrypt.c EAX implementation, decrypt block, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Decrypt data with the EAX protocol @param eax The EAX state @param ct The ciphertext @param pt [out] The plaintext @param length The length (octets) of the ciphertext @return CRYPT_OK if successful */ int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, unsigned long length) { int err; LTC_ARGCHK(eax != NULL); LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); /* omac ciphertext */ if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) { return err; } /* decrypt */ return ctr_decrypt(ct, pt, length, &eax->ctr); } #endif --- NEW FILE: eax_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 */ /** @file eax_done.c EAX implementation, terminate session, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Terminate an EAX session and get the tag. @param eax The EAX state @param tag [out] The destination of the authentication tag @param taglen [in/out] The max length and resulting length of the authentication tag @return CRYPT_OK if successful */ int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen) { int err; unsigned char *headermac, *ctmac; unsigned long x, len; LTC_ARGCHK(eax != NULL); LTC_ARGCHK(tag != NULL); LTC_ARGCHK(taglen != NULL); /* allocate ram */ headermac = XMALLOC(MAXBLOCKSIZE); ctmac = XMALLOC(MAXBLOCKSIZE); if (headermac == NULL || ctmac == NULL) { if (headermac != NULL) { XFREE(headermac); } if (ctmac != NULL) { XFREE(ctmac); } return CRYPT_MEM; } /* finish ctomac */ len = MAXBLOCKSIZE; if ((err = omac_done(&eax->ctomac, ctmac, &len)) != CRYPT_OK) { goto LBL_ERR; } /* finish headeromac */ /* note we specifically don't reset len so the two lens are minimal */ if ((err = omac_done(&eax->headeromac, headermac, &len)) != CRYPT_OK) { goto LBL_ERR; } /* terminate the CTR chain */ if ((err = ctr_done(&eax->ctr)) != CRYPT_OK) { goto LBL_ERR; } /* compute N xor H xor C */ for (x = 0; x < len && x < *taglen; x++) { tag[x] = eax->N[x] ^ headermac[x] ^ ctmac[x]; } *taglen = x; err = CRYPT_OK; LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(ctmac, MAXBLOCKSIZE); zeromem(headermac, MAXBLOCKSIZE); zeromem(eax, sizeof(*eax)); #endif XFREE(ctmac); XFREE(headermac); return err; } #endif --- NEW FILE: eax_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 */ /** @file eax_encrypt.c EAX implementation, encrypt block by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Encrypt with EAX a block of data. @param eax The EAX state @param pt The plaintext to encrypt @param ct [out] The ciphertext as encrypted @param length The length of the plaintext (octets) @return CRYPT_OK if successful */ int eax_encrypt(eax_state *eax, const unsigned char *pt, unsigned char *ct, unsigned long length) { int err; LTC_ARGCHK(eax != NULL); LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); /* encrypt */ if ((err = ctr_encrypt(pt, ct, length, &eax->ctr)) != CRYPT_OK) { return err; } /* omac ciphertext */ return omac_process(&eax->ctomac, ct, length); } #endif --- NEW FILE: eax_init.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 */ /** @file eax_init.c EAX implementation, initialized EAX state, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Initialized an EAX state @param eax [out] The EAX state to initialize @param cipher The index of the desired cipher @param key The secret key @param keylen The length of the secret key (octets) @param nonce The use-once nonce for the session @param noncelen The length of the nonce (octets) @param header The header for the EAX state @param headerlen The header length (octets) @return CRYPT_OK if successful */ int eax_init(eax_state *eax, int cipher, const unsigned char *key, unsigned long keylen, const unsigned char *nonce, unsigned long noncelen, const unsigned char *header, unsigned long headerlen) { unsigned char *buf; int err, blklen; omac_state *omac; unsigned long len; LTC_ARGCHK(eax != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(nonce != NULL); if (headerlen > 0) { LTC_ARGCHK(header != NULL); } if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } blklen = cipher_descriptor[cipher].block_length; /* allocate ram */ buf = XMALLOC(MAXBLOCKSIZE); omac = XMALLOC(sizeof(*omac)); if (buf == NULL || omac == NULL) { if (buf != NULL) { XFREE(buf); } if (omac != NULL) { XFREE(omac); } return CRYPT_MEM; } /* N = OMAC_0K(nonce) */ zeromem(buf, MAXBLOCKSIZE); if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } /* omac the [0]_n */ if ((err = omac_process(omac, buf, blklen)) != CRYPT_OK) { goto LBL_ERR; } /* omac the nonce */ if ((err = omac_process(omac, nonce, noncelen)) != CRYPT_OK) { goto LBL_ERR; } /* store result */ len = sizeof(eax->N); if ((err = omac_done(omac, eax->N, &len)) != CRYPT_OK) { goto LBL_ERR; } /* H = OMAC_1K(header) */ zeromem(buf, MAXBLOCKSIZE); buf[blklen - 1] = 1; if ((err = omac_init(&eax->headeromac, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } /* omac the [1]_n */ if ((err = omac_process(&eax->headeromac, buf, blklen)) != CRYPT_OK) { goto LBL_ERR; } /* omac the header */ if (headerlen != 0) { if ((err = omac_process(&eax->headeromac, header, headerlen)) != CRYPT_OK) { goto LBL_ERR; } } /* note we don't finish the headeromac, this allows us to add more header later */ /* setup the CTR mode */ if ((err = ctr_start(cipher, eax->N, key, keylen, 0, &eax->ctr)) != CRYPT_OK) { goto LBL_ERR; } /* use big-endian counter */ eax->ctr.mode = 1; /* setup the OMAC for the ciphertext */ if ((err = omac_init(&eax->ctomac, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } /* omac [2]_n */ zeromem(buf, MAXBLOCKSIZE); buf[blklen-1] = 2; if ((err = omac_process(&eax->ctomac, buf, blklen)) != CRYPT_OK) { goto LBL_ERR; } err = CRYPT_OK; LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(buf, MAXBLOCKSIZE); zeromem(omac, sizeof(*omac)); #endif XFREE(omac); XFREE(buf); return err; } #endif --- NEW FILE: eax_test.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 */ /** @file eax_test.c EAX implementation, self-test, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** Test the EAX implementation @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled */ int eax_test(void) { #ifndef LTC_TEST return CRYPT_NOP; #else static const struct { int keylen, noncelen, headerlen, msglen; unsigned char key[MAXBLOCKSIZE], nonce[MAXBLOCKSIZE], header[MAXBLOCKSIZE], plaintext[MAXBLOCKSIZE], ciphertext[MAXBLOCKSIZE], tag[MAXBLOCKSIZE]; } tests[] = { /* NULL message */ { 16, 0, 0, 0, /* key */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* nonce */ { 0 }, /* header */ { 0 }, /* plaintext */ { 0 }, /* ciphertext */ { 0 }, /* tag */ { 0x9a, 0xd0, 0x7e, 0x7d, 0xbf, 0xf3, 0x01, 0xf5, 0x05, 0xde, 0x59, 0x6b, 0x96, 0x15, 0xdf, 0xff } }, /* test with nonce */ { 16, 16, 0, 0, /* key */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* nonce */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* header */ { 0 }, /* plaintext */ { 0 }, /* ciphertext */ { 0 }, /* tag */ { 0x1c, 0xe1, 0x0d, 0x3e, 0xff, 0xd4, 0xca, 0xdb, 0xe2, 0xe4, 0x4b, 0x58, 0xd6, 0x0a, 0xb9, 0xec } }, /* test with header [no nonce] */ { 16, 0, 16, 0, /* key */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* nonce */ { 0 }, /* header */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* plaintext */ { 0 }, /* ciphertext */ { 0 }, /* tag */ { 0x3a, 0x69, 0x8f, 0x7a, 0x27, 0x0e, 0x51, 0xb0, 0xf6, 0x5b, 0x3d, 0x3e, 0x47, 0x19, 0x3c, 0xff } }, /* test with header + nonce + plaintext */ { 16, 16, 16, 32, /* key */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* nonce */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* header */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* plaintext */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f }, /* ciphertext */ { 0x29, 0xd8, 0x78, 0xd1, 0xa3, 0xbe, 0x85, 0x7b, 0x6f, 0xb8, 0xc8, 0xea, 0x59, 0x50, 0xa7, 0x78, 0x33, 0x1f, 0xbf, 0x2c, 0xcf, 0x33, 0x98, 0x6f, 0x35, 0xe8, 0xcf, 0x12, 0x1d, 0xcb, 0x30, 0xbc }, /* tag */ { 0x4f, 0xbe, 0x03, 0x38, 0xbe, 0x1c, 0x8c, 0x7e, 0x1d, 0x7a, 0xe7, 0xe4, 0x5b, 0x92, 0xc5, 0x87 } }, /* test with header + nonce + plaintext [not even sizes!] */ { 16, 15, 14, 29, /* key */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, /* nonce */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e }, /* header */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d }, /* plaintext */ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c }, /* ciphertext */ { 0xdd, 0x25, 0xc7, 0x54, 0xc5, 0xb1, 0x7c, 0x59, 0x28, 0xb6, 0x9b, 0x73, 0x15, 0x5f, 0x7b, 0xb8, 0x88, 0x8f, 0xaf, 0x37, 0x09, 0x1a, 0xd9, 0x2c, 0x8a, 0x24, 0xdb, 0x86, 0x8b }, /* tag */ { 0x0d, 0x1a, 0x14, 0xe5, 0x22, 0x24, 0xff, 0xd2, 0x3a, 0x05, 0xfa, 0x02, 0xcd, 0xef, 0x52, 0xda } }, /* Vectors from Brian Gladman */ { 16, 16, 8, 0, /* key */ { 0x23, 0x39, 0x52, 0xde, 0xe4, 0xd5, 0xed, 0x5f, 0x9b, 0x9c, 0x6d, 0x6f, 0xf8, 0x0f, 0xf4, 0x78 }, /* nonce */ { 0x62, 0xec, 0x67, 0xf9, 0xc3, 0xa4, 0xa4, 0x07, 0xfc, 0xb2, 0xa8, 0xc4, 0x90, 0x31, 0xa8, 0xb3 }, /* header */ { 0x6b, 0xfb, 0x91, 0x4f, 0xd0, 0x7e, 0xae, 0x6b }, /* PT */ { 0x00 }, /* CT */ { 0x00 }, /* tag */ { 0xe0, 0x37, 0x83, 0x0e, 0x83, 0x89, 0xf2, 0x7b, 0x02, 0x5a, 0x2d, 0x65, 0x27, 0xe7, 0x9d, 0x01 } }, { 16, 16, 8, 2, /* key */ { 0x91, 0x94, 0x5d, 0x3f, 0x4d, 0xcb, 0xee, 0x0b, 0xf4, 0x5e, 0xf5, 0x22, 0x55, 0xf0, 0x95, 0xa4 }, /* nonce */ { 0xbe, 0xca, 0xf0, 0x43, 0xb0, 0xa2, 0x3d, 0x84, 0x31, 0x94, 0xba, 0x97, 0x2c, 0x66, 0xde, 0xbd }, /* header */ { 0xfa, 0x3b, 0xfd, 0x48, 0x06, 0xeb, 0x53, 0xfa }, /* PT */ { 0xf7, 0xfb }, /* CT */ { 0x19, 0xdd }, /* tag */ { 0x5c, 0x4c, 0x93, 0x31, 0x04, 0x9d, 0x0b, 0xda, 0xb0, 0x27, 0x74, 0x08, 0xf6, 0x79, 0x67, 0xe5 } }, { 16, 16, 8, 5, /* key */ { 0x01, 0xf7, 0x4a, 0xd6, 0x40, 0x77, 0xf2, 0xe7, 0x04, 0xc0, 0xf6, 0x0a, 0xda, 0x3d, 0xd5, 0x23 }, /* nonce */ { 0x70, 0xc3, 0xdb, 0x4f, 0x0d, 0x26, 0x36, 0x84, 0x00, 0xa1, 0x0e, 0xd0, 0x5d, 0x2b, 0xff, 0x5e }, /* header */ { 0x23, 0x4a, 0x34, 0x63, 0xc1, 0x26, 0x4a, 0xc6 }, /* PT */ { 0x1a, 0x47, 0xcb, 0x49, 0x33 }, /* CT */ { 0xd8, 0x51, 0xd5, 0xba, 0xe0 }, /* Tag */ { 0x3a, 0x59, 0xf2, 0x38, 0xa2, 0x3e, 0x39, 0x19, 0x9d, 0xc9, 0x26, 0x66, 0x26, 0xc4, 0x0f, 0x80 } } }; int err, x, idx, res; unsigned long len; unsigned char outct[MAXBLOCKSIZE], outtag[MAXBLOCKSIZE]; /* AES can be under rijndael or aes... try to find it */ if ((idx = find_cipher("aes")) == -1) { if ((idx = find_cipher("rijndael")) == -1) { return CRYPT_NOP; } } for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) { len = sizeof(outtag); if ((err = eax_encrypt_authenticate_memory(idx, tests[x].key, tests[x].keylen, tests[x].nonce, tests[x].noncelen, tests[x].header, tests[x].headerlen, tests[x].plaintext, tests[x].msglen, outct, outtag, &len)) != CRYPT_OK) { return err; } if (memcmp(outct, tests[x].ciphertext, tests[x].msglen) || memcmp(outtag, tests[x].tag, len)) { #if 0 unsigned long y; printf("\n\nFailure: \nCT:\n"); for (y = 0; y < (unsigned long)tests[x].msglen; ) { printf("0x%02x", outct[y]); if (y < (unsigned long)(tests[x].msglen-1)) printf(", "); if (!(++y % 8)) printf("\n"); } printf("\nTAG:\n"); for (y = 0; y < len; ) { printf("0x%02x", outtag[y]); if (y < len-1) printf(", "); if (!(++y % 8)) printf("\n"); } #endif return CRYPT_FAIL_TESTVECTOR; } /* test decrypt */ if ((err = eax_decrypt_verify_memory(idx, tests[x].key, tests[x].keylen, tests[x].nonce, tests[x].noncelen, tests[x].header, tests[x].headerlen, outct, tests[x].msglen, outct, outtag, len, &res)) != CRYPT_OK) { return err; } if ((res != 1) || memcmp(outct, tests[x].plaintext, tests[x].msglen)) { #if 0 unsigned long y; printf("\n\nFailure (res == %d): \nPT:\n", res); for (y = 0; y < (unsigned long)tests[x].msglen; ) { printf("0x%02x", outct[y]); if (y < (unsigned long)(tests[x].msglen-1)) printf(", "); if (!(++y % 8)) printf("\n"); } printf("\n\n"); #endif return CRYPT_FAIL_TESTVECTOR; } } return CRYPT_OK; #endif /* LTC_TEST */ } #endif /* EAX_MODE */ --- NEW FILE: eax_encrypt_authenticate_memory.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 */ /** @file eax_encrypt_authenticate_memory.c EAX implementation, encrypt a block of memory, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** EAX encrypt and produce an authentication tag @param cipher The index of the cipher desired @param key The secret key to use @param keylen The length of the secret key (octets) @param nonce The session nonce [use once] @param noncelen The length of the nonce @param header The header for the session @param headerlen The length of the header (octets) @param pt The plaintext @param ptlen The length of the plaintext (octets) @param ct [out] The ciphertext @param tag [out] The destination tag @param taglen [in/out] The max size and resulting size of the authentication tag @return CRYPT_OK if successful */ int eax_encrypt_authenticate_memory(int cipher, const unsigned char *key, unsigned long keylen, const unsigned char *nonce, unsigned long noncelen, const unsigned char *header, unsigned long headerlen, const unsigned char *pt, unsigned long ptlen, unsigned char *ct, unsigned char *tag, unsigned long *taglen) { int err; eax_state *eax; LTC_ARGCHK(key != NULL); LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); LTC_ARGCHK(tag != NULL); LTC_ARGCHK(taglen != NULL); eax = XMALLOC(sizeof(*eax)); if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) { goto LBL_ERR; } err = CRYPT_OK; LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(eax, sizeof(*eax)); #endif XFREE(eax); return err; } #endif --- NEW FILE: eax_addheader.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 */ /** @file eax_addheader.c EAX implementation, add meta-data, by Tom St Denis */ #include "tomcrypt.h" #ifdef EAX_MODE /** add header (metadata) to the stream @param eax The current EAX state @param header The header (meta-data) data you wish to add to the state @param length The length of the header data @return CRYPT_OK if successful */ int eax_addheader(eax_state *eax, const unsigned char *header, unsigned long length) { LTC_ARGCHK(eax != NULL); LTC_ARGCHK(header != NULL); return omac_process(&eax->headeromac, header, length); } #endif |