+++ /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 rc5.c
- LTC_RC5 code by Tom St Denis
-*/
-
-#include "tomcrypt.h"
-
-#ifdef LTC_RC5
-
-const struct ltc_cipher_descriptor rc5_desc =
-{
- "rc5",
- 2,
- 8, 128, 8, 12,
- &rc5_setup,
- &rc5_ecb_encrypt,
- &rc5_ecb_decrypt,
- &rc5_test,
- &rc5_done,
- &rc5_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
-};
-
-static const ulong32 stab[50] = {
-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, 0xe96a3d2fUL, 0x87a1b6e8UL, 0x25d930a1UL, 0xc410aa5aUL,
-0x62482413UL, 0x007f9dccUL
-};
-
- /**
- Initialize the LTC_RC5 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 _rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-#else
-int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-#endif
-{
- ulong32 L[64], *S, A, B, i, j, v, s, t, l;
-
- LTC_ARGCHK(skey != NULL);
- LTC_ARGCHK(key != NULL);
-
- /* test parameters */
- if (num_rounds == 0) {
- num_rounds = rc5_desc.default_rounds;
- }
-
- if (num_rounds < 12 || num_rounds > 24) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- /* key must be between 64 and 1024 bits */
- if (keylen < 8 || keylen > 128) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- skey->rc5.rounds = num_rounds;
- S = skey->rc5.K;
-
- /* 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) == 0) {
- L[j++] = BSWAP(A);
- A = 0;
- }
- }
-
- if ((keylen & 3) != 0) {
- A <<= (ulong32)((8 * (4 - (keylen&3))));
- L[j++] = BSWAP(A);
- }
-
- /* setup the S array */
- t = (ulong32)(2 * (num_rounds + 1));
- XMEMCPY(S, stab, t * sizeof(*S));
-
- /* mix buffer */
- s = 3 * MAX(t, 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 == t) { i = 0; }
- if (++j == l) { j = 0; }
- }
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
-{
- int x;
- x = _rc5_setup(key, keylen, num_rounds, skey);
- burn_stack(sizeof(ulong32) * 122 + sizeof(int));
- return x;
-}
-#endif
-
-/**
- Encrypts a block of text with LTC_RC5
- @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
-*/
-#ifdef LTC_CLEAN_STACK
-static int _rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-#else
-int rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-#endif
-{
- ulong32 A, B, *K;
- int r;
- LTC_ARGCHK(skey != NULL);
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
-
- LOAD32L(A, &pt[0]);
- LOAD32L(B, &pt[4]);
- A += skey->rc5.K[0];
- B += skey->rc5.K[1];
- K = skey->rc5.K + 2;
-
- if ((skey->rc5.rounds & 1) == 0) {
- for (r = 0; r < skey->rc5.rounds; r += 2) {
- A = ROL(A ^ B, B) + K[0];
- B = ROL(B ^ A, A) + K[1];
- A = ROL(A ^ B, B) + K[2];
- B = ROL(B ^ A, A) + K[3];
- K += 4;
- }
- } else {
- for (r = 0; r < skey->rc5.rounds; r++) {
- A = ROL(A ^ B, B) + K[0];
- B = ROL(B ^ A, A) + K[1];
- K += 2;
- }
- }
- STORE32L(A, &ct[0]);
- STORE32L(B, &ct[4]);
-
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
-{
- int err = _rc5_ecb_encrypt(pt, ct, skey);
- burn_stack(sizeof(ulong32) * 2 + sizeof(int));
- return err;
-}
-#endif
-
-/**
- Decrypts a block of text with LTC_RC5
- @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
-*/
-#ifdef LTC_CLEAN_STACK
-static int _rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-#else
-int rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-#endif
-{
- ulong32 A, B, *K;
- int r;
- LTC_ARGCHK(skey != NULL);
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
-
- LOAD32L(A, &ct[0]);
- LOAD32L(B, &ct[4]);
- K = skey->rc5.K + (skey->rc5.rounds << 1);
-
- if ((skey->rc5.rounds & 1) == 0) {
- K -= 2;
- for (r = skey->rc5.rounds - 1; r >= 0; r -= 2) {
- B = ROR(B - K[3], A) ^ A;
- A = ROR(A - K[2], B) ^ B;
- B = ROR(B - K[1], A) ^ A;
- A = ROR(A - K[0], B) ^ B;
- K -= 4;
- }
- } else {
- for (r = skey->rc5.rounds - 1; r >= 0; r--) {
- B = ROR(B - K[1], A) ^ A;
- A = ROR(A - K[0], B) ^ B;
- K -= 2;
- }
- }
- A -= skey->rc5.K[0];
- B -= skey->rc5.K[1];
- STORE32L(A, &pt[0]);
- STORE32L(B, &pt[4]);
-
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
-{
- int err = _rc5_ecb_decrypt(ct, pt, skey);
- burn_stack(sizeof(ulong32) * 2 + sizeof(int));
- return err;
-}
-#endif
-
-/**
- Performs a self-test of the LTC_RC5 block cipher
- @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
-*/
-int rc5_test(void)
-{
- #ifndef LTC_TEST
- return CRYPT_NOP;
- #else
- static const struct {
- unsigned char key[16], pt[8], ct[8];
- } tests[] = {
- {
- { 0x91, 0x5f, 0x46, 0x19, 0xbe, 0x41, 0xb2, 0x51,
- 0x63, 0x55, 0xa5, 0x01, 0x10, 0xa9, 0xce, 0x91 },
- { 0x21, 0xa5, 0xdb, 0xee, 0x15, 0x4b, 0x8f, 0x6d },
- { 0xf7, 0xc0, 0x13, 0xac, 0x5b, 0x2b, 0x89, 0x52 }
- },
- {
- { 0x78, 0x33, 0x48, 0xe7, 0x5a, 0xeb, 0x0f, 0x2f,
- 0xd7, 0xb1, 0x69, 0xbb, 0x8d, 0xc1, 0x67, 0x87 },
- { 0xF7, 0xC0, 0x13, 0xAC, 0x5B, 0x2B, 0x89, 0x52 },
- { 0x2F, 0x42, 0xB3, 0xB7, 0x03, 0x69, 0xFC, 0x92 }
- },
- {
- { 0xDC, 0x49, 0xdb, 0x13, 0x75, 0xa5, 0x58, 0x4f,
- 0x64, 0x85, 0xb4, 0x13, 0xb5, 0xf1, 0x2b, 0xaf },
- { 0x2F, 0x42, 0xB3, 0xB7, 0x03, 0x69, 0xFC, 0x92 },
- { 0x65, 0xc1, 0x78, 0xb2, 0x84, 0xd1, 0x97, 0xcc }
- }
- };
- unsigned char tmp[2][8];
- int x, y, err;
- symmetric_key key;
-
- for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
- /* setup key */
- if ((err = rc5_setup(tests[x].key, 16, 12, &key)) != CRYPT_OK) {
- return err;
- }
-
- /* encrypt and decrypt */
- rc5_ecb_encrypt(tests[x].pt, tmp[0], &key);
- rc5_ecb_decrypt(tmp[0], tmp[1], &key);
-
- /* compare */
- if (compare_testvector(tmp[0], 8, tests[x].ct, 8, "RC5 Encrypt", x) != 0 ||
- compare_testvector(tmp[1], 8, tests[x].pt, 8, "RC5 Decrypt", x) != 0) {
- 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 < 8; y++) tmp[0][y] = 0;
- for (y = 0; y < 1000; y++) rc5_ecb_encrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 1000; y++) rc5_ecb_decrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
- }
- return CRYPT_OK;
- #endif
-}
-
-/** Terminate the context
- @param skey The scheduled key
-*/
-void rc5_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 rc5_keysize(int *keysize)
-{
- LTC_ARGCHK(keysize != NULL);
- if (*keysize < 8) {
- return CRYPT_INVALID_KEYSIZE;
- } else if (*keysize > 128) {
- *keysize = 128;
- }
- return CRYPT_OK;
-}
-
-#endif
-
-
-
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */
projects / zpackage / blobdiff