| // SPDX-License-Identifier: BSD-2-Clause |
| /* 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 multi2.c |
| Multi-2 implementation (not public domain, hence the default disable) |
| */ |
| #include "tomcrypt_private.h" |
| |
| #ifdef LTC_MULTI2 |
| |
| static void pi1(ulong32 *p) |
| { |
| p[1] ^= p[0]; |
| } |
| |
| static void pi2(ulong32 *p, const ulong32 *k) |
| { |
| ulong32 t; |
| t = (p[1] + k[0]) & 0xFFFFFFFFUL; |
| t = (ROL(t, 1) + t - 1) & 0xFFFFFFFFUL; |
| t = (ROL(t, 4) ^ t) & 0xFFFFFFFFUL; |
| p[0] ^= t; |
| } |
| |
| static void pi3(ulong32 *p, const ulong32 *k) |
| { |
| ulong32 t; |
| t = p[0] + k[1]; |
| t = (ROL(t, 2) + t + 1) & 0xFFFFFFFFUL; |
| t = (ROL(t, 8) ^ t) & 0xFFFFFFFFUL; |
| t = (t + k[2]) & 0xFFFFFFFFUL; |
| t = (ROL(t, 1) - t) & 0xFFFFFFFFUL; |
| t = ROL(t, 16) ^ (p[0] | t); |
| p[1] ^= t; |
| } |
| |
| static void pi4(ulong32 *p, const ulong32 *k) |
| { |
| ulong32 t; |
| t = (p[1] + k[3]) & 0xFFFFFFFFUL; |
| t = (ROL(t, 2) + t + 1) & 0xFFFFFFFFUL; |
| p[0] ^= t; |
| } |
| |
| static void setup(const ulong32 *dk, const ulong32 *k, ulong32 *uk) |
| { |
| int n, t; |
| ulong32 p[2]; |
| |
| p[0] = dk[0]; p[1] = dk[1]; |
| |
| t = 4; |
| n = 0; |
| pi1(p); |
| pi2(p, k); |
| uk[n++] = p[0]; |
| pi3(p, k); |
| uk[n++] = p[1]; |
| pi4(p, k); |
| uk[n++] = p[0]; |
| pi1(p); |
| uk[n++] = p[1]; |
| pi2(p, k+t); |
| uk[n++] = p[0]; |
| pi3(p, k+t); |
| uk[n++] = p[1]; |
| pi4(p, k+t); |
| uk[n++] = p[0]; |
| pi1(p); |
| uk[n++] = p[1]; |
| } |
| |
| static void encrypt(ulong32 *p, int N, const ulong32 *uk) |
| { |
| int n, t; |
| for (t = n = 0; ; ) { |
| pi1(p); if (++n == N) break; |
| pi2(p, uk+t); if (++n == N) break; |
| pi3(p, uk+t); if (++n == N) break; |
| pi4(p, uk+t); if (++n == N) break; |
| t ^= 4; |
| } |
| } |
| |
| static void decrypt(ulong32 *p, int N, const ulong32 *uk) |
| { |
| int n, t; |
| for (t = 4*(((N-1)>>2)&1), n = N; ; ) { |
| switch (n<=4 ? n : ((n-1)%4)+1) { |
| case 4: pi4(p, uk+t); --n; /* FALLTHROUGH */ |
| case 3: pi3(p, uk+t); --n; /* FALLTHROUGH */ |
| case 2: pi2(p, uk+t); --n; /* FALLTHROUGH */ |
| case 1: pi1(p); --n; break; |
| case 0: return; |
| } |
| t ^= 4; |
| } |
| } |
| |
| const struct ltc_cipher_descriptor multi2_desc = { |
| "multi2", |
| 22, |
| 40, 40, 8, 128, |
| &multi2_setup, |
| &multi2_ecb_encrypt, |
| &multi2_ecb_decrypt, |
| &multi2_test, |
| &multi2_done, |
| &multi2_keysize, |
| NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
| }; |
| |
| int multi2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
| { |
| ulong32 sk[8], dk[2]; |
| int x; |
| |
| LTC_ARGCHK(key != NULL); |
| LTC_ARGCHK(skey != NULL); |
| |
| if (keylen != 40) return CRYPT_INVALID_KEYSIZE; |
| if (num_rounds == 0) num_rounds = 128; |
| |
| skey->multi2.N = num_rounds; |
| for (x = 0; x < 8; x++) { |
| LOAD32H(sk[x], key + x*4); |
| } |
| LOAD32H(dk[0], key + 32); |
| LOAD32H(dk[1], key + 36); |
| setup(dk, sk, skey->multi2.uk); |
| |
| zeromem(sk, sizeof(sk)); |
| zeromem(dk, sizeof(dk)); |
| return CRYPT_OK; |
| } |
| |
| /** |
| Encrypts a block of text with multi2 |
| @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 |
| */ |
| int multi2_ecb_encrypt(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey) |
| { |
| ulong32 p[2]; |
| LTC_ARGCHK(pt != NULL); |
| LTC_ARGCHK(ct != NULL); |
| LTC_ARGCHK(skey != NULL); |
| LOAD32H(p[0], pt); |
| LOAD32H(p[1], pt+4); |
| encrypt(p, skey->multi2.N, skey->multi2.uk); |
| STORE32H(p[0], ct); |
| STORE32H(p[1], ct+4); |
| return CRYPT_OK; |
| } |
| |
| /** |
| Decrypts a block of text with multi2 |
| @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 |
| */ |
| int multi2_ecb_decrypt(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey) |
| { |
| ulong32 p[2]; |
| LTC_ARGCHK(pt != NULL); |
| LTC_ARGCHK(ct != NULL); |
| LTC_ARGCHK(skey != NULL); |
| LOAD32H(p[0], ct); |
| LOAD32H(p[1], ct+4); |
| decrypt(p, skey->multi2.N, skey->multi2.uk); |
| STORE32H(p[0], pt); |
| STORE32H(p[1], pt+4); |
| return CRYPT_OK; |
| } |
| |
| /** |
| Performs a self-test of the multi2 block cipher |
| @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
| */ |
| int multi2_test(void) |
| { |
| static const struct { |
| unsigned char key[40]; |
| unsigned char pt[8], ct[8]; |
| int rounds; |
| } tests[] = { |
| { |
| { |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, |
| |
| 0x01, 0x23, 0x45, 0x67, |
| 0x89, 0xAB, 0xCD, 0xEF |
| }, |
| { |
| 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x01, |
| }, |
| { |
| 0xf8, 0x94, 0x40, 0x84, |
| 0x5e, 0x11, 0xcf, 0x89 |
| }, |
| 128, |
| }, |
| { |
| { |
| 0x35, 0x91, 0x9d, 0x96, |
| 0x07, 0x02, 0xe2, 0xce, |
| 0x8d, 0x0b, 0x58, 0x3c, |
| 0xc9, 0xc8, 0x9d, 0x59, |
| 0xa2, 0xae, 0x96, 0x4e, |
| 0x87, 0x82, 0x45, 0xed, |
| 0x3f, 0x2e, 0x62, 0xd6, |
| 0x36, 0x35, 0xd0, 0x67, |
| |
| 0xb1, 0x27, 0xb9, 0x06, |
| 0xe7, 0x56, 0x22, 0x38, |
| }, |
| { |
| 0x1f, 0xb4, 0x60, 0x60, |
| 0xd0, 0xb3, 0x4f, 0xa5 |
| }, |
| { |
| 0xca, 0x84, 0xa9, 0x34, |
| 0x75, 0xc8, 0x60, 0xe5 |
| }, |
| 216, |
| } |
| }; |
| unsigned char buf[8]; |
| symmetric_key skey; |
| int err, x; |
| |
| for (x = 1; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) { |
| if ((err = multi2_setup(tests[x].key, 40, tests[x].rounds, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| if ((err = multi2_ecb_encrypt(tests[x].pt, buf, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| |
| if (compare_testvector(buf, 8, tests[x].ct, 8, "Multi2 Encrypt", x)) { |
| return CRYPT_FAIL_TESTVECTOR; |
| } |
| |
| if ((err = multi2_ecb_decrypt(buf, buf, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| if (compare_testvector(buf, 8, tests[x].pt, 8, "Multi2 Decrypt", x)) { |
| return CRYPT_FAIL_TESTVECTOR; |
| } |
| } |
| |
| for (x = 128; x < 256; ++x) { |
| unsigned char ct[8]; |
| |
| if ((err = multi2_setup(tests[0].key, 40, x, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| if ((err = multi2_ecb_encrypt(tests[0].pt, ct, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| if ((err = multi2_ecb_decrypt(ct, buf, &skey)) != CRYPT_OK) { |
| return err; |
| } |
| if (compare_testvector(buf, 8, tests[0].pt, 8, "Multi2 Rounds", x)) { |
| return CRYPT_FAIL_TESTVECTOR; |
| } |
| } |
| |
| return CRYPT_OK; |
| } |
| |
| /** Terminate the context |
| @param skey The scheduled key |
| */ |
| void multi2_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 multi2_keysize(int *keysize) |
| { |
| LTC_ARGCHK(keysize != NULL); |
| if (*keysize >= 40) { |
| *keysize = 40; |
| } else { |
| return CRYPT_INVALID_KEYSIZE; |
| } |
| return CRYPT_OK; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |