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320 lines
7.2 KiB
320 lines
7.2 KiB
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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/**
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@file multi2.c
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Multi-2 implementation (not public domain, hence the default disable)
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MULTI2
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static void pi1(ulong32 *p)
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{
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p[1] ^= p[0];
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}
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static void pi2(ulong32 *p, ulong32 *k)
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{
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ulong32 t;
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t = (p[1] + k[0]) & 0xFFFFFFFFUL;
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t = (ROL(t, 1) + t - 1) & 0xFFFFFFFFUL;
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t = (ROL(t, 4) ^ t) & 0xFFFFFFFFUL;
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p[0] ^= t;
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}
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static void pi3(ulong32 *p, ulong32 *k)
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{
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ulong32 t;
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t = p[0] + k[1];
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t = (ROL(t, 2) + t + 1) & 0xFFFFFFFFUL;
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t = (ROL(t, 8) ^ t) & 0xFFFFFFFFUL;
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t = (t + k[2]) & 0xFFFFFFFFUL;
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t = (ROL(t, 1) - t) & 0xFFFFFFFFUL;
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t = ROL(t, 16) ^ (p[0] | t);
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p[1] ^= t;
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}
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static void pi4(ulong32 *p, ulong32 *k)
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{
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ulong32 t;
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t = (p[1] + k[3]) & 0xFFFFFFFFUL;
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t = (ROL(t, 2) + t + 1) & 0xFFFFFFFFUL;
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p[0] ^= t;
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}
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static void setup(ulong32 *dk, ulong32 *k, ulong32 *uk)
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{
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int n, t;
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ulong32 p[2];
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p[0] = dk[0]; p[1] = dk[1];
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t = 4;
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n = 0;
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pi1(p);
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pi2(p, k);
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uk[n++] = p[0];
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pi3(p, k);
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uk[n++] = p[1];
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pi4(p, k);
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uk[n++] = p[0];
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pi1(p);
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uk[n++] = p[1];
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pi2(p, k+t);
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uk[n++] = p[0];
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pi3(p, k+t);
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uk[n++] = p[1];
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pi4(p, k+t);
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uk[n++] = p[0];
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pi1(p);
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uk[n++] = p[1];
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}
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static void encrypt(ulong32 *p, int N, ulong32 *uk)
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{
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int n, t;
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for (t = n = 0; ; ) {
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pi1(p); if (++n == N) break;
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pi2(p, uk+t); if (++n == N) break;
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pi3(p, uk+t); if (++n == N) break;
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pi4(p, uk+t); if (++n == N) break;
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t ^= 4;
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}
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}
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static void decrypt(ulong32 *p, int N, ulong32 *uk)
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{
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int n, t;
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for (t = 4*(((N-1)>>2)&1), n = N; ; ) {
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switch (n<=4 ? n : ((n-1)%4)+1) {
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case 4: pi4(p, uk+t); --n; /* FALLTHROUGH */
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case 3: pi3(p, uk+t); --n; /* FALLTHROUGH */
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case 2: pi2(p, uk+t); --n; /* FALLTHROUGH */
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case 1: pi1(p); --n; break;
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case 0: return;
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}
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t ^= 4;
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}
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}
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const struct ltc_cipher_descriptor multi2_desc = {
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"multi2",
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22,
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40, 40, 8, 128,
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&multi2_setup,
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&multi2_ecb_encrypt,
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&multi2_ecb_decrypt,
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&multi2_test,
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&multi2_done,
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&multi2_keysize,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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int multi2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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{
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ulong32 sk[8], dk[2];
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int x;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(skey != NULL);
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if (keylen != 40) return CRYPT_INVALID_KEYSIZE;
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if (num_rounds == 0) num_rounds = 128;
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skey->multi2.N = num_rounds;
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for (x = 0; x < 8; x++) {
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LOAD32H(sk[x], key + x*4);
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}
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LOAD32H(dk[0], key + 32);
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LOAD32H(dk[1], key + 36);
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setup(dk, sk, skey->multi2.uk);
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zeromem(sk, sizeof(sk));
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zeromem(dk, sizeof(dk));
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return CRYPT_OK;
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}
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/**
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Encrypts a block of text with multi2
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@param pt The input plaintext (8 bytes)
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@param ct The output ciphertext (8 bytes)
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@param skey The key as scheduled
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@return CRYPT_OK if successful
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*/
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int multi2_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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{
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ulong32 p[2];
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(skey != NULL);
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LOAD32H(p[0], pt);
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LOAD32H(p[1], pt+4);
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encrypt(p, skey->multi2.N, skey->multi2.uk);
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STORE32H(p[0], ct);
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STORE32H(p[1], ct+4);
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return CRYPT_OK;
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}
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/**
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Decrypts a block of text with multi2
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@param ct The input ciphertext (8 bytes)
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@param pt The output plaintext (8 bytes)
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@param skey The key as scheduled
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@return CRYPT_OK if successful
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*/
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int multi2_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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{
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ulong32 p[2];
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(skey != NULL);
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LOAD32H(p[0], ct);
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LOAD32H(p[1], ct+4);
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decrypt(p, skey->multi2.N, skey->multi2.uk);
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STORE32H(p[0], pt);
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STORE32H(p[1], pt+4);
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return CRYPT_OK;
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}
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/**
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Performs a self-test of the multi2 block cipher
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@return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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*/
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int multi2_test(void)
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{
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static const struct {
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unsigned char key[40];
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unsigned char pt[8], ct[8];
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int rounds;
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} tests[] = {
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{
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{
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x01, 0x23, 0x45, 0x67,
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0x89, 0xAB, 0xCD, 0xEF
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},
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{
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01,
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},
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{
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0xf8, 0x94, 0x40, 0x84,
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0x5e, 0x11, 0xcf, 0x89
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},
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128,
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},
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{
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{
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0x35, 0x91, 0x9d, 0x96,
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0x07, 0x02, 0xe2, 0xce,
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0x8d, 0x0b, 0x58, 0x3c,
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0xc9, 0xc8, 0x9d, 0x59,
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0xa2, 0xae, 0x96, 0x4e,
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0x87, 0x82, 0x45, 0xed,
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0x3f, 0x2e, 0x62, 0xd6,
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0x36, 0x35, 0xd0, 0x67,
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0xb1, 0x27, 0xb9, 0x06,
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0xe7, 0x56, 0x22, 0x38,
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},
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{
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0x1f, 0xb4, 0x60, 0x60,
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0xd0, 0xb3, 0x4f, 0xa5
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},
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{
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0xca, 0x84, 0xa9, 0x34,
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0x75, 0xc8, 0x60, 0xe5
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},
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216,
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}
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};
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unsigned char buf[8];
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symmetric_key skey;
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int err, x;
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for (x = 1; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
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if ((err = multi2_setup(tests[x].key, 40, tests[x].rounds, &skey)) != CRYPT_OK) {
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return err;
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}
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if ((err = multi2_ecb_encrypt(tests[x].pt, buf, &skey)) != CRYPT_OK) {
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return err;
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}
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if (compare_testvector(buf, 8, tests[x].ct, 8, "Multi2 Encrypt", x)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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if ((err = multi2_ecb_decrypt(buf, buf, &skey)) != CRYPT_OK) {
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return err;
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}
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if (compare_testvector(buf, 8, tests[x].pt, 8, "Multi2 Decrypt", x)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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}
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for (x = 128; x < 256; ++x) {
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unsigned char ct[8];
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if ((err = multi2_setup(tests[0].key, 40, x, &skey)) != CRYPT_OK) {
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return err;
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}
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if ((err = multi2_ecb_encrypt(tests[0].pt, ct, &skey)) != CRYPT_OK) {
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return err;
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}
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if ((err = multi2_ecb_decrypt(ct, buf, &skey)) != CRYPT_OK) {
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return err;
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}
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if (compare_testvector(buf, 8, tests[0].pt, 8, "Multi2 Rounds", x)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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}
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return CRYPT_OK;
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}
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/** Terminate the context
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@param skey The scheduled key
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*/
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void multi2_done(symmetric_key *skey)
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{
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LTC_UNUSED_PARAM(skey);
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}
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/**
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Gets suitable key size
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@param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
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@return CRYPT_OK if the input key size is acceptable.
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*/
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int multi2_keysize(int *keysize)
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{
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LTC_ARGCHK(keysize != NULL);
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if (*keysize >= 40) {
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*keysize = 40;
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} else {
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return CRYPT_INVALID_KEYSIZE;
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}
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return CRYPT_OK;
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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