| /* 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, tomstdenis@iahu.ca, http://libtomcrypt.org |
| */ |
| /* Implementation of the Noekeon block cipher by Tom St Denis */ |
| #include "mycrypt.h" |
| |
| #ifdef NOEKEON |
| |
| const struct _cipher_descriptor noekeon_desc = |
| { |
| "noekeon", |
| 16, |
| 16, 16, 16, 16, |
| &noekeon_setup, |
| &noekeon_ecb_encrypt, |
| &noekeon_ecb_decrypt, |
| &noekeon_test, |
| &noekeon_keysize |
| }; |
| |
| static const ulong32 RC[] = { |
| 0x00000080UL, 0x0000001bUL, 0x00000036UL, 0x0000006cUL, |
| 0x000000d8UL, 0x000000abUL, 0x0000004dUL, 0x0000009aUL, |
| 0x0000002fUL, 0x0000005eUL, 0x000000bcUL, 0x00000063UL, |
| 0x000000c6UL, 0x00000097UL, 0x00000035UL, 0x0000006aUL, |
| 0x000000d4UL |
| }; |
| |
| #define kTHETA(a, b, c, d) \ |
| temp = a^c; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \ |
| b ^= temp; d ^= temp; \ |
| temp = b^d; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \ |
| a ^= temp; c ^= temp; |
| |
| #define THETA(k, a, b, c, d) \ |
| temp = a^c; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \ |
| b ^= temp ^ k[1]; d ^= temp ^ k[3]; \ |
| temp = b^d; temp = temp ^ ROL(temp, 8) ^ ROR(temp, 8); \ |
| a ^= temp ^ k[0]; c ^= temp ^ k[2]; |
| |
| #define GAMMA(a, b, c, d) \ |
| b ^= ~(d|c); \ |
| a ^= c&b; \ |
| temp = d; d = a; a = temp;\ |
| c ^= a ^ b ^ d; \ |
| b ^= ~(d|c); \ |
| a ^= c&b; |
| |
| #define PI1(a, b, c, d) \ |
| a = ROL(a, 1); c = ROL(c, 5); d = ROL(d, 2); |
| |
| #define PI2(a, b, c, d) \ |
| a = ROR(a, 1); c = ROR(c, 5); d = ROR(d, 2); |
| |
| int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
| { |
| ulong32 temp; |
| |
| _ARGCHK(key != NULL); |
| _ARGCHK(skey != NULL); |
| |
| if (keylen != 16) { |
| return CRYPT_INVALID_KEYSIZE; |
| } |
| |
| if (num_rounds != 16 && num_rounds != 0) { |
| return CRYPT_INVALID_ROUNDS; |
| } |
| |
| LOAD32H(skey->noekeon.K[0],&key[0]); |
| LOAD32H(skey->noekeon.K[1],&key[4]); |
| LOAD32H(skey->noekeon.K[2],&key[8]); |
| LOAD32H(skey->noekeon.K[3],&key[12]); |
| |
| LOAD32H(skey->noekeon.dK[0],&key[0]); |
| LOAD32H(skey->noekeon.dK[1],&key[4]); |
| LOAD32H(skey->noekeon.dK[2],&key[8]); |
| LOAD32H(skey->noekeon.dK[3],&key[12]); |
| |
| kTHETA(skey->noekeon.dK[0], skey->noekeon.dK[1], skey->noekeon.dK[2], skey->noekeon.dK[3]); |
| |
| return CRYPT_OK; |
| } |
| |
| #ifdef CLEAN_STACK |
| static void _noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key) |
| #else |
| void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key) |
| #endif |
| { |
| ulong32 a,b,c,d,temp; |
| int r; |
| |
| _ARGCHK(key != NULL); |
| _ARGCHK(pt != NULL); |
| _ARGCHK(ct != NULL); |
| |
| LOAD32H(a,&pt[0]); LOAD32H(b,&pt[4]); |
| LOAD32H(c,&pt[8]); LOAD32H(d,&pt[12]); |
| |
| #define ROUND(i) \ |
| a ^= RC[i]; \ |
| THETA(key->noekeon.K, a,b,c,d); \ |
| PI1(a,b,c,d); \ |
| GAMMA(a,b,c,d); \ |
| PI2(a,b,c,d); |
| |
| for (r = 0; r < 16; ++r) { |
| ROUND(r); |
| } |
| |
| #undef ROUND |
| |
| a ^= RC[16]; |
| THETA(key->noekeon.K, a, b, c, d); |
| |
| STORE32H(a,&ct[0]); STORE32H(b,&ct[4]); |
| STORE32H(c,&ct[8]); STORE32H(d,&ct[12]); |
| } |
| |
| #ifdef CLEAN_STACK |
| void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key) |
| { |
| _noekeon_ecb_encrypt(pt, ct, key); |
| burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
| } |
| #endif |
| |
| #ifdef CLEAN_STACK |
| static void _noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key) |
| #else |
| void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key) |
| #endif |
| { |
| ulong32 a,b,c,d, temp; |
| int r; |
| |
| _ARGCHK(key != NULL); |
| _ARGCHK(pt != NULL); |
| _ARGCHK(ct != NULL); |
| |
| LOAD32H(a,&ct[0]); LOAD32H(b,&ct[4]); |
| LOAD32H(c,&ct[8]); LOAD32H(d,&ct[12]); |
| |
| |
| #define ROUND(i) \ |
| THETA(key->noekeon.dK, a,b,c,d); \ |
| a ^= RC[i]; \ |
| PI1(a,b,c,d); \ |
| GAMMA(a,b,c,d); \ |
| PI2(a,b,c,d); |
| |
| for (r = 16; r > 0; --r) { |
| ROUND(r); |
| } |
| |
| #undef ROUND |
| |
| THETA(key->noekeon.dK, a,b,c,d); |
| a ^= RC[0]; |
| STORE32H(a,&pt[0]); STORE32H(b, &pt[4]); |
| STORE32H(c,&pt[8]); STORE32H(d, &pt[12]); |
| } |
| |
| #ifdef CLEAN_STACK |
| void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key) |
| { |
| _noekeon_ecb_decrypt(ct, pt, key); |
| burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
| } |
| #endif |
| |
| int noekeon_test(void) |
| { |
| #ifndef LTC_TEST |
| return CRYPT_NOP; |
| #else |
| static const struct { |
| int keylen; |
| unsigned char key[16], pt[16], ct[16]; |
| } tests[] = { |
| { |
| 16, |
| { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, |
| { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, |
| { 0x18, 0xa6, 0xec, 0xe5, 0x28, 0xaa, 0x79, 0x73, |
| 0x28, 0xb2, 0xc0, 0x91, 0xa0, 0x2f, 0x54, 0xc5} |
| } |
| }; |
| symmetric_key key; |
| unsigned char tmp[2][16]; |
| int err, i, y; |
| |
| for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
| zeromem(&key, sizeof(key)); |
| if ((err = noekeon_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) { |
| return err; |
| } |
| |
| noekeon_ecb_encrypt(tests[i].pt, tmp[0], &key); |
| noekeon_ecb_decrypt(tmp[0], tmp[1], &key); |
| if (memcmp(tmp[0], tests[i].ct, 16) || memcmp(tmp[1], tests[i].pt, 16)) { |
| #if 0 |
| printf("\n\nTest %d failed\n", i); |
| if (memcmp(tmp[0], tests[i].ct, 16)) { |
| printf("CT: "); |
| for (i = 0; i < 16; i++) { |
| printf("%02x ", tmp[0][i]); |
| } |
| printf("\n"); |
| } else { |
| printf("PT: "); |
| for (i = 0; i < 16; i++) { |
| printf("%02x ", tmp[1][i]); |
| } |
| printf("\n"); |
| } |
| #endif |
| 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 < 16; y++) tmp[0][y] = 0; |
| for (y = 0; y < 1000; y++) noekeon_ecb_encrypt(tmp[0], tmp[0], &key); |
| for (y = 0; y < 1000; y++) noekeon_ecb_decrypt(tmp[0], tmp[0], &key); |
| for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
| } |
| return CRYPT_OK; |
| #endif |
| } |
| |
| int noekeon_keysize(int *desired_keysize) |
| { |
| _ARGCHK(desired_keysize != NULL); |
| if (*desired_keysize < 16) { |
| return CRYPT_INVALID_KEYSIZE; |
| } else { |
| *desired_keysize = 16; |
| return CRYPT_OK; |
| } |
| } |
| |
| #endif |
| |