+++ /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 rc6.c
- LTC_RC6 code by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_RC6
-
-const struct ltc_cipher_descriptor rc6_desc =
-{
- "rc6",
- 3,
- 8, 128, 16, 20,
- &rc6_setup,
- &rc6_ecb_encrypt,
- &rc6_ecb_decrypt,
- &rc6_test,
- &rc6_done,
- &rc6_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
-};
-
-static const ulong32 stab[44] = {
-0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL,
-0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL,
-0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL,
-0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL,
-0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL,
-0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL };
-
- /**
- Initialize the LTC_RC6 block cipher
- @param key The symmetric key you wish to pass
- @param keylen The key length in bytes
- @param num_rounds The number of rounds desired (0 for default)
- @param skey The key in as scheduled by this function.
- @return CRYPT_OK if successful
- */
-#ifdef LTC_CLEAN_STACK
-static int _rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-#else
-int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-#endif
-{
- ulong32 L[64], S[50], A, B, i, j, v, s, l;
-
- LTC_ARGCHK(key != NULL);
- LTC_ARGCHK(skey != NULL);
-
- /* test parameters */
- if (num_rounds != 0 && num_rounds != 20) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- /* key must be between 64 and 1024 bits */
- if (keylen < 8 || keylen > 128) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- /* copy the key into the L array */
- for (A = i = j = 0; i < (ulong32)keylen; ) {
- A = (A << 8) | ((ulong32)(key[i++] & 255));
- if (!(i & 3)) {
- L[j++] = BSWAP(A);
- A = 0;
- }
- }
-
- /* handle odd sized keys */
- if (keylen & 3) {
- A <<= (8 * (4 - (keylen&3)));
- L[j++] = BSWAP(A);
- }
-
- /* setup the S array */
- XMEMCPY(S, stab, 44 * sizeof(stab[0]));
-
- /* mix buffer */
- s = 3 * MAX(44, j);
- l = j;
- for (A = B = i = j = v = 0; v < s; v++) {
- A = S[i] = ROLc(S[i] + A + B, 3);
- B = L[j] = ROL(L[j] + A + B, (A+B));
- if (++i == 44) { i = 0; }
- if (++j == l) { j = 0; }
- }
-
- /* copy to key */
- for (i = 0; i < 44; i++) {
- skey->rc6.K[i] = S[i];
- }
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-{
- int x;
- x = _rc6_setup(key, keylen, num_rounds, skey);
- burn_stack(sizeof(ulong32) * 122);
- return x;
-}
-#endif
-
-/**
- Encrypts a block of text with LTC_RC6
- @param pt The input plaintext (16 bytes)
- @param ct The output ciphertext (16 bytes)
- @param skey The key as scheduled
-*/
-#ifdef LTC_CLEAN_STACK
-static int _rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-#else
-int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-#endif
-{
- ulong32 a,b,c,d,t,u, *K;
- int r;
-
- LTC_ARGCHK(skey != NULL);
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
- LOAD32L(a,&pt[0]);LOAD32L(b,&pt[4]);LOAD32L(c,&pt[8]);LOAD32L(d,&pt[12]);
-
- b += skey->rc6.K[0];
- d += skey->rc6.K[1];
-
-#define RND(a,b,c,d) \
- t = (b * (b + b + 1)); t = ROLc(t, 5); \
- u = (d * (d + d + 1)); u = ROLc(u, 5); \
- a = ROL(a^t,u) + K[0]; \
- c = ROL(c^u,t) + K[1]; K += 2;
-
- K = skey->rc6.K + 2;
- for (r = 0; r < 20; r += 4) {
- RND(a,b,c,d);
- RND(b,c,d,a);
- RND(c,d,a,b);
- RND(d,a,b,c);
- }
-
-#undef RND
-
- a += skey->rc6.K[42];
- c += skey->rc6.K[43];
- STORE32L(a,&ct[0]);STORE32L(b,&ct[4]);STORE32L(c,&ct[8]);STORE32L(d,&ct[12]);
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-{
- int err = _rc6_ecb_encrypt(pt, ct, skey);
- burn_stack(sizeof(ulong32) * 6 + sizeof(int));
- return err;
-}
-#endif
-
-/**
- Decrypts a block of text with LTC_RC6
- @param ct The input ciphertext (16 bytes)
- @param pt The output plaintext (16 bytes)
- @param skey The key as scheduled
-*/
-#ifdef LTC_CLEAN_STACK
-static int _rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-#else
-int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-#endif
-{
- ulong32 a,b,c,d,t,u, *K;
- int r;
-
- LTC_ARGCHK(skey != NULL);
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
-
- LOAD32L(a,&ct[0]);LOAD32L(b,&ct[4]);LOAD32L(c,&ct[8]);LOAD32L(d,&ct[12]);
- a -= skey->rc6.K[42];
- c -= skey->rc6.K[43];
-
-#define RND(a,b,c,d) \
- t = (b * (b + b + 1)); t = ROLc(t, 5); \
- u = (d * (d + d + 1)); u = ROLc(u, 5); \
- c = ROR(c - K[1], t) ^ u; \
- a = ROR(a - K[0], u) ^ t; K -= 2;
-
- K = skey->rc6.K + 40;
-
- for (r = 0; r < 20; r += 4) {
- RND(d,a,b,c);
- RND(c,d,a,b);
- RND(b,c,d,a);
- RND(a,b,c,d);
- }
-
-#undef RND
-
- b -= skey->rc6.K[0];
- d -= skey->rc6.K[1];
- STORE32L(a,&pt[0]);STORE32L(b,&pt[4]);STORE32L(c,&pt[8]);STORE32L(d,&pt[12]);
-
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-{
- int err = _rc6_ecb_decrypt(ct, pt, skey);
- burn_stack(sizeof(ulong32) * 6 + sizeof(int));
- return err;
-}
-#endif
-
-/**
- Performs a self-test of the LTC_RC6 block cipher
- @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
-*/
-int rc6_test(void)
-{
- #ifndef LTC_TEST
- return CRYPT_NOP;
- #else
- static const struct {
- int keylen;
- unsigned char key[32], pt[16], ct[16];
- } tests[] = {
- {
- 16,
- { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
- 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
- { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
- 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
- { 0x52, 0x4e, 0x19, 0x2f, 0x47, 0x15, 0xc6, 0x23,
- 0x1f, 0x51, 0xf6, 0x36, 0x7e, 0xa4, 0x3f, 0x18 }
- },
- {
- 24,
- { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
- 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
- 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
- { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
- 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
- { 0x68, 0x83, 0x29, 0xd0, 0x19, 0xe5, 0x05, 0x04,
- 0x1e, 0x52, 0xe9, 0x2a, 0xf9, 0x52, 0x91, 0xd4 }
- },
- {
- 32,
- { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
- 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
- 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
- 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe },
- { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
- 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
- { 0xc8, 0x24, 0x18, 0x16, 0xf0, 0xd7, 0xe4, 0x89,
- 0x20, 0xad, 0x16, 0xa1, 0x67, 0x4e, 0x5d, 0x48 }
- }
- };
- unsigned char tmp[2][16];
- int x, y, err;
- symmetric_key key;
-
- for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
- /* setup key */
- if ((err = rc6_setup(tests[x].key, tests[x].keylen, 0, &key)) != CRYPT_OK) {
- return err;
- }
-
- /* encrypt and decrypt */
- rc6_ecb_encrypt(tests[x].pt, tmp[0], &key);
- rc6_ecb_decrypt(tmp[0], tmp[1], &key);
-
- /* compare */
- if (compare_testvector(tmp[0], 16, tests[x].ct, 16, "RC6 Encrypt", x) ||
- compare_testvector(tmp[1], 16, tests[x].pt, 16, "RC6 Decrypt", x)) {
- return CRYPT_FAIL_TESTVECTOR;
- }
-
- /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
- for (y = 0; y < 16; y++) tmp[0][y] = 0;
- for (y = 0; y < 1000; y++) rc6_ecb_encrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 1000; y++) rc6_ecb_decrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
- }
- return CRYPT_OK;
- #endif
-}
-
-/** Terminate the context
- @param skey The scheduled key
-*/
-void rc6_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 rc6_keysize(int *keysize)
-{
- LTC_ARGCHK(keysize != NULL);
- if (*keysize < 8) {
- return CRYPT_INVALID_KEYSIZE;
- } else if (*keysize > 128) {
- *keysize = 128;
- }
- return CRYPT_OK;
-}
-
-#endif /*LTC_RC6*/
-
-
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */
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