X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fciphers%2Fmulti2.c;fp=libtomcrypt%2Fsrc%2Fciphers%2Fmulti2.c;h=86c181204bdf244afaedb83e85769066ffb59f62;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage diff --git a/libtomcrypt/src/ciphers/multi2.c b/libtomcrypt/src/ciphers/multi2.c new file mode 100644 index 0000000..86c1812 --- /dev/null +++ b/libtomcrypt/src/ciphers/multi2.c @@ -0,0 +1,319 @@ +/* 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: $Format:%ai$ */