+++ /dev/null
-/* 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: $Format:%ai$ */
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