X-Git-Url: https://pd.if.org/git/?p=zpackage;a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fciphers%2Fskipjack.c;fp=libtomcrypt%2Fsrc%2Fciphers%2Fskipjack.c;h=0000000000000000000000000000000000000000;hp=d47f2d3048cabff50ed502fc7135d241c0030c65;hb=72b60d5f77676b6b500d58bae81a27923fa1bee7;hpb=2a3d80be326e401f9008d695232fe5543c909d18 diff --git a/libtomcrypt/src/ciphers/skipjack.c b/libtomcrypt/src/ciphers/skipjack.c deleted file mode 100644 index d47f2d3..0000000 --- a/libtomcrypt/src/ciphers/skipjack.c +++ /dev/null @@ -1,343 +0,0 @@ -/* 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. - */ - -/** - @file skipjack.c - Skipjack Implementation by Tom St Denis -*/ -#include "tomcrypt.h" - -#ifdef LTC_SKIPJACK - -const struct ltc_cipher_descriptor skipjack_desc = -{ - "skipjack", - 17, - 10, 10, 8, 32, - &skipjack_setup, - &skipjack_ecb_encrypt, - &skipjack_ecb_decrypt, - &skipjack_test, - &skipjack_done, - &skipjack_keysize, - NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL -}; - -static const unsigned char sbox[256] = { - 0xa3,0xd7,0x09,0x83,0xf8,0x48,0xf6,0xf4,0xb3,0x21,0x15,0x78,0x99,0xb1,0xaf,0xf9, - 0xe7,0x2d,0x4d,0x8a,0xce,0x4c,0xca,0x2e,0x52,0x95,0xd9,0x1e,0x4e,0x38,0x44,0x28, - 0x0a,0xdf,0x02,0xa0,0x17,0xf1,0x60,0x68,0x12,0xb7,0x7a,0xc3,0xe9,0xfa,0x3d,0x53, - 0x96,0x84,0x6b,0xba,0xf2,0x63,0x9a,0x19,0x7c,0xae,0xe5,0xf5,0xf7,0x16,0x6a,0xa2, - 0x39,0xb6,0x7b,0x0f,0xc1,0x93,0x81,0x1b,0xee,0xb4,0x1a,0xea,0xd0,0x91,0x2f,0xb8, - 0x55,0xb9,0xda,0x85,0x3f,0x41,0xbf,0xe0,0x5a,0x58,0x80,0x5f,0x66,0x0b,0xd8,0x90, - 0x35,0xd5,0xc0,0xa7,0x33,0x06,0x65,0x69,0x45,0x00,0x94,0x56,0x6d,0x98,0x9b,0x76, - 0x97,0xfc,0xb2,0xc2,0xb0,0xfe,0xdb,0x20,0xe1,0xeb,0xd6,0xe4,0xdd,0x47,0x4a,0x1d, - 0x42,0xed,0x9e,0x6e,0x49,0x3c,0xcd,0x43,0x27,0xd2,0x07,0xd4,0xde,0xc7,0x67,0x18, - 0x89,0xcb,0x30,0x1f,0x8d,0xc6,0x8f,0xaa,0xc8,0x74,0xdc,0xc9,0x5d,0x5c,0x31,0xa4, - 0x70,0x88,0x61,0x2c,0x9f,0x0d,0x2b,0x87,0x50,0x82,0x54,0x64,0x26,0x7d,0x03,0x40, - 0x34,0x4b,0x1c,0x73,0xd1,0xc4,0xfd,0x3b,0xcc,0xfb,0x7f,0xab,0xe6,0x3e,0x5b,0xa5, - 0xad,0x04,0x23,0x9c,0x14,0x51,0x22,0xf0,0x29,0x79,0x71,0x7e,0xff,0x8c,0x0e,0xe2, - 0x0c,0xef,0xbc,0x72,0x75,0x6f,0x37,0xa1,0xec,0xd3,0x8e,0x62,0x8b,0x86,0x10,0xe8, - 0x08,0x77,0x11,0xbe,0x92,0x4f,0x24,0xc5,0x32,0x36,0x9d,0xcf,0xf3,0xa6,0xbb,0xac, - 0x5e,0x6c,0xa9,0x13,0x57,0x25,0xb5,0xe3,0xbd,0xa8,0x3a,0x01,0x05,0x59,0x2a,0x46 -}; - -/* simple x + 1 (mod 10) in one step. */ -static const int keystep[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 }; - -/* simple x - 1 (mod 10) in one step */ -static const int ikeystep[] = { 9, 0, 1, 2, 3, 4, 5, 6, 7, 8 }; - - /** - Initialize the Skipjack block cipher - @param key The symmetric key you wish to pass - @param keylen The key length in bytes - @param num_rounds The number of rounds desired (0 for default) - @param skey The key in as scheduled by this function. - @return CRYPT_OK if successful - */ -int skipjack_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) -{ - int x; - - LTC_ARGCHK(key != NULL); - LTC_ARGCHK(skey != NULL); - - if (keylen != 10) { - return CRYPT_INVALID_KEYSIZE; - } - - if (num_rounds != 32 && num_rounds != 0) { - return CRYPT_INVALID_ROUNDS; - } - - /* make sure the key is in range for platforms where CHAR_BIT != 8 */ - for (x = 0; x < 10; x++) { - skey->skipjack.key[x] = key[x] & 255; - } - - return CRYPT_OK; -} - -#define RULE_A \ - tmp = g_func(w1, &kp, skey->skipjack.key); \ - w1 = tmp ^ w4 ^ x; \ - w4 = w3; w3 = w2; \ - w2 = tmp; - -#define RULE_B \ - tmp = g_func(w1, &kp, skey->skipjack.key); \ - tmp1 = w4; w4 = w3; \ - w3 = w1 ^ w2 ^ x; \ - w1 = tmp1; w2 = tmp; - -#define RULE_A1 \ - tmp = w1 ^ w2 ^ x; \ - w1 = ig_func(w2, &kp, skey->skipjack.key); \ - w2 = w3; w3 = w4; w4 = tmp; - -#define RULE_B1 \ - tmp = ig_func(w2, &kp, skey->skipjack.key); \ - w2 = tmp ^ w3 ^ x; \ - w3 = w4; w4 = w1; w1 = tmp; - -static unsigned g_func(unsigned w, int *kp, unsigned char *key) -{ - unsigned char g1,g2; - - g1 = (w >> 8) & 255; g2 = w & 255; - g1 ^= sbox[g2^key[*kp]]; *kp = keystep[*kp]; - g2 ^= sbox[g1^key[*kp]]; *kp = keystep[*kp]; - g1 ^= sbox[g2^key[*kp]]; *kp = keystep[*kp]; - g2 ^= sbox[g1^key[*kp]]; *kp = keystep[*kp]; - return ((unsigned)g1<<8)|(unsigned)g2; -} - -static unsigned ig_func(unsigned w, int *kp, unsigned char *key) -{ - unsigned char g1,g2; - - g1 = (w >> 8) & 255; g2 = w & 255; - *kp = ikeystep[*kp]; g2 ^= sbox[g1^key[*kp]]; - *kp = ikeystep[*kp]; g1 ^= sbox[g2^key[*kp]]; - *kp = ikeystep[*kp]; g2 ^= sbox[g1^key[*kp]]; - *kp = ikeystep[*kp]; g1 ^= sbox[g2^key[*kp]]; - return ((unsigned)g1<<8)|(unsigned)g2; -} - -/** - Encrypts a block of text with Skipjack - @param pt The input plaintext (8 bytes) - @param ct The output ciphertext (8 bytes) - @param skey The key as scheduled - @return CRYPT_OK if successful -*/ -#ifdef LTC_CLEAN_STACK -static int _skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) -#else -int skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) -#endif -{ - unsigned w1,w2,w3,w4,tmp,tmp1; - int x, kp; - - LTC_ARGCHK(pt != NULL); - LTC_ARGCHK(ct != NULL); - LTC_ARGCHK(skey != NULL); - - /* load block */ - w1 = ((unsigned)pt[0]<<8)|pt[1]; - w2 = ((unsigned)pt[2]<<8)|pt[3]; - w3 = ((unsigned)pt[4]<<8)|pt[5]; - w4 = ((unsigned)pt[6]<<8)|pt[7]; - - /* 8 rounds of RULE A */ - for (x = 1, kp = 0; x < 9; x++) { - RULE_A; - } - - /* 8 rounds of RULE B */ - for (; x < 17; x++) { - RULE_B; - } - - /* 8 rounds of RULE A */ - for (; x < 25; x++) { - RULE_A; - } - - /* 8 rounds of RULE B */ - for (; x < 33; x++) { - RULE_B; - } - - /* store block */ - ct[0] = (w1>>8)&255; ct[1] = w1&255; - ct[2] = (w2>>8)&255; ct[3] = w2&255; - ct[4] = (w3>>8)&255; ct[5] = w3&255; - ct[6] = (w4>>8)&255; ct[7] = w4&255; - - return CRYPT_OK; -} - -#ifdef LTC_CLEAN_STACK -int skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) -{ - int err = _skipjack_ecb_encrypt(pt, ct, skey); - burn_stack(sizeof(unsigned) * 8 + sizeof(int) * 2); - return err; -} -#endif - -/** - Decrypts a block of text with Skipjack - @param ct The input ciphertext (8 bytes) - @param pt The output plaintext (8 bytes) - @param skey The key as scheduled - @return CRYPT_OK if successful -*/ -#ifdef LTC_CLEAN_STACK -static int _skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) -#else -int skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) -#endif -{ - unsigned w1,w2,w3,w4,tmp; - int x, kp; - - LTC_ARGCHK(pt != NULL); - LTC_ARGCHK(ct != NULL); - LTC_ARGCHK(skey != NULL); - - /* load block */ - w1 = ((unsigned)ct[0]<<8)|ct[1]; - w2 = ((unsigned)ct[2]<<8)|ct[3]; - w3 = ((unsigned)ct[4]<<8)|ct[5]; - w4 = ((unsigned)ct[6]<<8)|ct[7]; - - /* 8 rounds of RULE B^-1 - - Note the value "kp = 8" comes from "kp = (32 * 4) mod 10" where 32*4 is 128 which mod 10 is 8 - */ - for (x = 32, kp = 8; x > 24; x--) { - RULE_B1; - } - - /* 8 rounds of RULE A^-1 */ - for (; x > 16; x--) { - RULE_A1; - } - - - /* 8 rounds of RULE B^-1 */ - for (; x > 8; x--) { - RULE_B1; - } - - /* 8 rounds of RULE A^-1 */ - for (; x > 0; x--) { - RULE_A1; - } - - /* store block */ - pt[0] = (w1>>8)&255; pt[1] = w1&255; - pt[2] = (w2>>8)&255; pt[3] = w2&255; - pt[4] = (w3>>8)&255; pt[5] = w3&255; - pt[6] = (w4>>8)&255; pt[7] = w4&255; - - return CRYPT_OK; -} - -#ifdef LTC_CLEAN_STACK -int skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) -{ - int err = _skipjack_ecb_decrypt(ct, pt, skey); - burn_stack(sizeof(unsigned) * 7 + sizeof(int) * 2); - return err; -} -#endif - -/** - Performs a self-test of the Skipjack block cipher - @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled -*/ -int skipjack_test(void) -{ - #ifndef LTC_TEST - return CRYPT_NOP; - #else - static const struct { - unsigned char key[10], pt[8], ct[8]; - } tests[] = { - { - { 0x00, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }, - { 0x33, 0x22, 0x11, 0x00, 0xdd, 0xcc, 0xbb, 0xaa }, - { 0x25, 0x87, 0xca, 0xe2, 0x7a, 0x12, 0xd3, 0x00 } - } - }; - unsigned char buf[2][8]; - int x, y, err; - symmetric_key key; - - for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) { - /* setup key */ - if ((err = skipjack_setup(tests[x].key, 10, 0, &key)) != CRYPT_OK) { - return err; - } - - /* encrypt and decrypt */ - skipjack_ecb_encrypt(tests[x].pt, buf[0], &key); - skipjack_ecb_decrypt(buf[0], buf[1], &key); - - /* compare */ - if (compare_testvector(buf[0], 8, tests[x].ct, 8, "Skipjack Encrypt", x) != 0 || - compare_testvector(buf[1], 8, tests[x].pt, 8, "Skipjack Decrypt", x) != 0) { - return CRYPT_FAIL_TESTVECTOR; - } - - /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ - for (y = 0; y < 8; y++) buf[0][y] = 0; - for (y = 0; y < 1000; y++) skipjack_ecb_encrypt(buf[0], buf[0], &key); - for (y = 0; y < 1000; y++) skipjack_ecb_decrypt(buf[0], buf[0], &key); - for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; - } - - return CRYPT_OK; - #endif -} - -/** Terminate the context - @param skey The scheduled key -*/ -void skipjack_done(symmetric_key *skey) -{ - LTC_UNUSED_PARAM(skey); -} - -/** - Gets suitable key size - @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable. - @return CRYPT_OK if the input key size is acceptable. -*/ -int skipjack_keysize(int *keysize) -{ - LTC_ARGCHK(keysize != NULL); - if (*keysize < 10) { - return CRYPT_INVALID_KEYSIZE; - } else if (*keysize > 10) { - *keysize = 10; - } - return CRYPT_OK; -} - -#endif - -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */