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-rw-r--r--libtom-src/ciphers/multi2.c320
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diff --git a/libtom-src/ciphers/multi2.c b/libtom-src/ciphers/multi2.c
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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.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+ */
+
+/**
+ @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;
+ case 3: pi3(p, uk+t); --n;
+ case 2: pi2(p, uk+t); --n;
+ 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
+};
+
+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 (XMEMCMP(buf, tests[x].ct, 8)) {
+ return CRYPT_FAIL_TESTVECTOR;
+ }
+
+ if ((err = multi2_ecb_decrypt(buf, buf, &skey)) != CRYPT_OK) {
+ return err;
+ }
+ if (XMEMCMP(buf, tests[x].pt, 8)) {
+ 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 (XMEMCMP(buf, tests[0].pt, 8)) {
+ return CRYPT_FAIL_TESTVECTOR;
+ }
+ }
+
+ return CRYPT_OK;
+}
+
+/** Terminate the context
+ @param skey The scheduled key
+*/
+void multi2_done(symmetric_key *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
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */
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