Mercurial > dropbear
view libtomcrypt/src/ciphers/multi2.c @ 1523:1d163552145f coverity
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 19 Feb 2018 23:14:49 +0800 |
parents | 6dba84798cd5 |
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/* 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.h" #ifdef LTC_MULTI2 static void pi1(ulong32 *p) { p[1] ^= p[0]; } static void pi2(ulong32 *p, 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, 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, ulong32 *k) { ulong32 t; t = (p[1] + k[3]) & 0xFFFFFFFFUL; t = (ROL(t, 2) + t + 1) & 0xFFFFFFFFUL; p[0] ^= t; } static void setup(ulong32 *dk, 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, 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, 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, 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, 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: $Format:%ai$ */