+++ /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: safer.c
-*
-* LTC_DESCRIPTION: block-cipher algorithm LTC_SAFER (Secure And Fast Encryption
-* Routine) in its four versions: LTC_SAFER K-64, LTC_SAFER K-128,
-* LTC_SAFER SK-64 and LTC_SAFER SK-128.
-*
-* AUTHOR: Richard De Moliner (demoliner@isi.ee.ethz.ch)
-* Signal and Information Processing Laboratory
-* Swiss Federal Institute of Technology
-* CH-8092 Zuerich, Switzerland
-*
-* DATE: September 9, 1995
-*
-* CHANGE HISTORY:
-*
-*******************************************************************************/
-
-#include "tomcrypt.h"
-
-#ifdef LTC_SAFER
-
-#define __LTC_SAFER_TAB_C__
-#include "safer_tab.c"
-
-const struct ltc_cipher_descriptor safer_k64_desc = {
- "safer-k64",
- 8, 8, 8, 8, LTC_SAFER_K64_DEFAULT_NOF_ROUNDS,
- &safer_k64_setup,
- &safer_ecb_encrypt,
- &safer_ecb_decrypt,
- &safer_k64_test,
- &safer_done,
- &safer_64_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
- },
-
- safer_sk64_desc = {
- "safer-sk64",
- 9, 8, 8, 8, LTC_SAFER_SK64_DEFAULT_NOF_ROUNDS,
- &safer_sk64_setup,
- &safer_ecb_encrypt,
- &safer_ecb_decrypt,
- &safer_sk64_test,
- &safer_done,
- &safer_64_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
- },
-
- safer_k128_desc = {
- "safer-k128",
- 10, 16, 16, 8, LTC_SAFER_K128_DEFAULT_NOF_ROUNDS,
- &safer_k128_setup,
- &safer_ecb_encrypt,
- &safer_ecb_decrypt,
- &safer_sk128_test,
- &safer_done,
- &safer_128_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
- },
-
- safer_sk128_desc = {
- "safer-sk128",
- 11, 16, 16, 8, LTC_SAFER_SK128_DEFAULT_NOF_ROUNDS,
- &safer_sk128_setup,
- &safer_ecb_encrypt,
- &safer_ecb_decrypt,
- &safer_sk128_test,
- &safer_done,
- &safer_128_keysize,
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
- };
-
-/******************* Constants ************************************************/
-/* #define TAB_LEN 256 */
-
-/******************* Assertions ***********************************************/
-
-/******************* Macros ***************************************************/
-#define ROL8(x, n) ((unsigned char)((unsigned int)(x) << (n)\
- |(unsigned int)((x) & 0xFF) >> (8 - (n))))
-#define EXP(x) safer_ebox[(x) & 0xFF]
-#define LOG(x) safer_lbox[(x) & 0xFF]
-#define PHT(x, y) { y += x; x += y; }
-#define IPHT(x, y) { x -= y; y -= x; }
-
-/******************* Types ****************************************************/
-
-#ifdef LTC_CLEAN_STACK
-static void _Safer_Expand_Userkey(const unsigned char *userkey_1,
- const unsigned char *userkey_2,
- unsigned int nof_rounds,
- int strengthened,
- safer_key_t key)
-#else
-static void Safer_Expand_Userkey(const unsigned char *userkey_1,
- const unsigned char *userkey_2,
- unsigned int nof_rounds,
- int strengthened,
- safer_key_t key)
-#endif
-{ unsigned int i, j, k;
- unsigned char ka[LTC_SAFER_BLOCK_LEN + 1];
- unsigned char kb[LTC_SAFER_BLOCK_LEN + 1];
-
- if (LTC_SAFER_MAX_NOF_ROUNDS < nof_rounds)
- nof_rounds = LTC_SAFER_MAX_NOF_ROUNDS;
- *key++ = (unsigned char)nof_rounds;
- ka[LTC_SAFER_BLOCK_LEN] = (unsigned char)0;
- kb[LTC_SAFER_BLOCK_LEN] = (unsigned char)0;
- k = 0;
- for (j = 0; j < LTC_SAFER_BLOCK_LEN; j++) {
- ka[j] = ROL8(userkey_1[j], 5);
- ka[LTC_SAFER_BLOCK_LEN] ^= ka[j];
- kb[j] = *key++ = userkey_2[j];
- kb[LTC_SAFER_BLOCK_LEN] ^= kb[j];
- }
- for (i = 1; i <= nof_rounds; i++) {
- for (j = 0; j < LTC_SAFER_BLOCK_LEN + 1; j++) {
- ka[j] = ROL8(ka[j], 6);
- kb[j] = ROL8(kb[j], 6);
- }
- if (strengthened) {
- k = 2 * i - 1;
- while (k >= (LTC_SAFER_BLOCK_LEN + 1)) { k -= LTC_SAFER_BLOCK_LEN + 1; }
- }
- for (j = 0; j < LTC_SAFER_BLOCK_LEN; j++) {
- if (strengthened) {
- *key++ = (ka[k]
- + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 1)&0xFF)]]) & 0xFF;
- if (++k == (LTC_SAFER_BLOCK_LEN + 1)) { k = 0; }
- } else {
- *key++ = (ka[j] + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 1)&0xFF)]]) & 0xFF;
- }
- }
- if (strengthened) {
- k = 2 * i;
- while (k >= (LTC_SAFER_BLOCK_LEN + 1)) { k -= LTC_SAFER_BLOCK_LEN + 1; }
- }
- for (j = 0; j < LTC_SAFER_BLOCK_LEN; j++) {
- if (strengthened) {
- *key++ = (kb[k]
- + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 10)&0xFF)]]) & 0xFF;
- if (++k == (LTC_SAFER_BLOCK_LEN + 1)) { k = 0; }
- } else {
- *key++ = (kb[j] + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 10)&0xFF)]]) & 0xFF;
- }
- }
- }
-
-#ifdef LTC_CLEAN_STACK
- zeromem(ka, sizeof(ka));
- zeromem(kb, sizeof(kb));
-#endif
-}
-
-#ifdef LTC_CLEAN_STACK
-static void Safer_Expand_Userkey(const unsigned char *userkey_1,
- const unsigned char *userkey_2,
- unsigned int nof_rounds,
- int strengthened,
- safer_key_t key)
-{
- _Safer_Expand_Userkey(userkey_1, userkey_2, nof_rounds, strengthened, key);
- burn_stack(sizeof(unsigned char) * (2 * (LTC_SAFER_BLOCK_LEN + 1)) + sizeof(unsigned int)*2);
-}
-#endif
-
-int safer_k64_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
-{
- LTC_ARGCHK(key != NULL);
- LTC_ARGCHK(skey != NULL);
-
- if (numrounds != 0 && (numrounds < 6 || numrounds > LTC_SAFER_MAX_NOF_ROUNDS)) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- if (keylen != 8) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- Safer_Expand_Userkey(key, key, (unsigned int)(numrounds != 0 ?numrounds:LTC_SAFER_K64_DEFAULT_NOF_ROUNDS), 0, skey->safer.key);
- return CRYPT_OK;
-}
-
-int safer_sk64_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
-{
- LTC_ARGCHK(key != NULL);
- LTC_ARGCHK(skey != NULL);
-
- if (numrounds != 0 && (numrounds < 6 || numrounds > LTC_SAFER_MAX_NOF_ROUNDS)) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- if (keylen != 8) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- Safer_Expand_Userkey(key, key, (unsigned int)(numrounds != 0 ?numrounds:LTC_SAFER_SK64_DEFAULT_NOF_ROUNDS), 1, skey->safer.key);
- return CRYPT_OK;
-}
-
-int safer_k128_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
-{
- LTC_ARGCHK(key != NULL);
- LTC_ARGCHK(skey != NULL);
-
- if (numrounds != 0 && (numrounds < 6 || numrounds > LTC_SAFER_MAX_NOF_ROUNDS)) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- if (keylen != 16) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- Safer_Expand_Userkey(key, key+8, (unsigned int)(numrounds != 0 ?numrounds:LTC_SAFER_K128_DEFAULT_NOF_ROUNDS), 0, skey->safer.key);
- return CRYPT_OK;
-}
-
-int safer_sk128_setup(const unsigned char *key, int keylen, int numrounds, symmetric_key *skey)
-{
- LTC_ARGCHK(key != NULL);
- LTC_ARGCHK(skey != NULL);
-
- if (numrounds != 0 && (numrounds < 6 || numrounds > LTC_SAFER_MAX_NOF_ROUNDS)) {
- return CRYPT_INVALID_ROUNDS;
- }
-
- if (keylen != 16) {
- return CRYPT_INVALID_KEYSIZE;
- }
-
- Safer_Expand_Userkey(key, key+8, (unsigned int)(numrounds != 0?numrounds:LTC_SAFER_SK128_DEFAULT_NOF_ROUNDS), 1, skey->safer.key);
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-static int _safer_ecb_encrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-#else
-int safer_ecb_encrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-#endif
-{ unsigned char a, b, c, d, e, f, g, h, t;
- unsigned int round;
- unsigned char *key;
-
- LTC_ARGCHK(block_in != NULL);
- LTC_ARGCHK(block_out != NULL);
- LTC_ARGCHK(skey != NULL);
-
- key = skey->safer.key;
- a = block_in[0]; b = block_in[1]; c = block_in[2]; d = block_in[3];
- e = block_in[4]; f = block_in[5]; g = block_in[6]; h = block_in[7];
- if (LTC_SAFER_MAX_NOF_ROUNDS < (round = *key)) round = LTC_SAFER_MAX_NOF_ROUNDS;
- while(round-- > 0)
- {
- a ^= *++key; b += *++key; c += *++key; d ^= *++key;
- e ^= *++key; f += *++key; g += *++key; h ^= *++key;
- a = EXP(a) + *++key; b = LOG(b) ^ *++key;
- c = LOG(c) ^ *++key; d = EXP(d) + *++key;
- e = EXP(e) + *++key; f = LOG(f) ^ *++key;
- g = LOG(g) ^ *++key; h = EXP(h) + *++key;
- PHT(a, b); PHT(c, d); PHT(e, f); PHT(g, h);
- PHT(a, c); PHT(e, g); PHT(b, d); PHT(f, h);
- PHT(a, e); PHT(b, f); PHT(c, g); PHT(d, h);
- t = b; b = e; e = c; c = t; t = d; d = f; f = g; g = t;
- }
- a ^= *++key; b += *++key; c += *++key; d ^= *++key;
- e ^= *++key; f += *++key; g += *++key; h ^= *++key;
- block_out[0] = a & 0xFF; block_out[1] = b & 0xFF;
- block_out[2] = c & 0xFF; block_out[3] = d & 0xFF;
- block_out[4] = e & 0xFF; block_out[5] = f & 0xFF;
- block_out[6] = g & 0xFF; block_out[7] = h & 0xFF;
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int safer_ecb_encrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-{
- int err = _safer_ecb_encrypt(block_in, block_out, skey);
- burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
- return err;
-}
-#endif
-
-#ifdef LTC_CLEAN_STACK
-static int _safer_ecb_decrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-#else
-int safer_ecb_decrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-#endif
-{ unsigned char a, b, c, d, e, f, g, h, t;
- unsigned int round;
- unsigned char *key;
-
- LTC_ARGCHK(block_in != NULL);
- LTC_ARGCHK(block_out != NULL);
- LTC_ARGCHK(skey != NULL);
-
- key = skey->safer.key;
- a = block_in[0]; b = block_in[1]; c = block_in[2]; d = block_in[3];
- e = block_in[4]; f = block_in[5]; g = block_in[6]; h = block_in[7];
- if (LTC_SAFER_MAX_NOF_ROUNDS < (round = *key)) round = LTC_SAFER_MAX_NOF_ROUNDS;
- key += LTC_SAFER_BLOCK_LEN * (1 + 2 * round);
- h ^= *key; g -= *--key; f -= *--key; e ^= *--key;
- d ^= *--key; c -= *--key; b -= *--key; a ^= *--key;
- while (round--)
- {
- t = e; e = b; b = c; c = t; t = f; f = d; d = g; g = t;
- IPHT(a, e); IPHT(b, f); IPHT(c, g); IPHT(d, h);
- IPHT(a, c); IPHT(e, g); IPHT(b, d); IPHT(f, h);
- IPHT(a, b); IPHT(c, d); IPHT(e, f); IPHT(g, h);
- h -= *--key; g ^= *--key; f ^= *--key; e -= *--key;
- d -= *--key; c ^= *--key; b ^= *--key; a -= *--key;
- h = LOG(h) ^ *--key; g = EXP(g) - *--key;
- f = EXP(f) - *--key; e = LOG(e) ^ *--key;
- d = LOG(d) ^ *--key; c = EXP(c) - *--key;
- b = EXP(b) - *--key; a = LOG(a) ^ *--key;
- }
- block_out[0] = a & 0xFF; block_out[1] = b & 0xFF;
- block_out[2] = c & 0xFF; block_out[3] = d & 0xFF;
- block_out[4] = e & 0xFF; block_out[5] = f & 0xFF;
- block_out[6] = g & 0xFF; block_out[7] = h & 0xFF;
- return CRYPT_OK;
-}
-
-#ifdef LTC_CLEAN_STACK
-int safer_ecb_decrypt(const unsigned char *block_in,
- unsigned char *block_out,
- symmetric_key *skey)
-{
- int err = _safer_ecb_decrypt(block_in, block_out, skey);
- burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
- return err;
-}
-#endif
-
-int safer_64_keysize(int *keysize)
-{
- LTC_ARGCHK(keysize != NULL);
- if (*keysize < 8) {
- return CRYPT_INVALID_KEYSIZE;
- } else {
- *keysize = 8;
- return CRYPT_OK;
- }
-}
-
-int safer_128_keysize(int *keysize)
-{
- LTC_ARGCHK(keysize != NULL);
- if (*keysize < 16) {
- return CRYPT_INVALID_KEYSIZE;
- } else {
- *keysize = 16;
- return CRYPT_OK;
- }
-}
-
-int safer_k64_test(void)
-{
- #ifndef LTC_TEST
- return CRYPT_NOP;
- #else
- static const unsigned char k64_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
- k64_key[] = { 8, 7, 6, 5, 4, 3, 2, 1 },
- k64_ct[] = { 200, 242, 156, 221, 135, 120, 62, 217 };
-
- symmetric_key skey;
- unsigned char buf[2][8];
- int err;
-
- /* test K64 */
- if ((err = safer_k64_setup(k64_key, 8, 6, &skey)) != CRYPT_OK) {
- return err;
- }
- safer_ecb_encrypt(k64_pt, buf[0], &skey);
- safer_ecb_decrypt(buf[0], buf[1], &skey);
-
- if (compare_testvector(buf[0], 8, k64_ct, 8, "Safer K64 Encrypt", 0) != 0 ||
- compare_testvector(buf[1], 8, k64_pt, 8, "Safer K64 Decrypt", 0) != 0) {
- return CRYPT_FAIL_TESTVECTOR;
- }
-
- return CRYPT_OK;
- #endif
-}
-
-
-int safer_sk64_test(void)
-{
- #ifndef LTC_TEST
- return CRYPT_NOP;
- #else
- static const unsigned char sk64_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
- sk64_key[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
- sk64_ct[] = { 95, 206, 155, 162, 5, 132, 56, 199 };
-
- symmetric_key skey;
- unsigned char buf[2][8];
- int err, y;
-
- /* test SK64 */
- if ((err = safer_sk64_setup(sk64_key, 8, 6, &skey)) != CRYPT_OK) {
- return err;
- }
-
- safer_ecb_encrypt(sk64_pt, buf[0], &skey);
- safer_ecb_decrypt(buf[0], buf[1], &skey);
-
- if (compare_testvector(buf[0], 8, sk64_ct, 8, "Safer SK64 Encrypt", 0) != 0 ||
- compare_testvector(buf[1], 8, sk64_pt, 8, "Safer SK64 Decrypt", 0) != 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++) buf[0][y] = 0;
- for (y = 0; y < 1000; y++) safer_ecb_encrypt(buf[0], buf[0], &skey);
- for (y = 0; y < 1000; y++) safer_ecb_decrypt(buf[0], buf[0], &skey);
- for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
-
- return CRYPT_OK;
- #endif
-}
-
-/** Terminate the context
- @param skey The scheduled key
-*/
-void safer_done(symmetric_key *skey)
-{
- LTC_UNUSED_PARAM(skey);
-}
-
-int safer_sk128_test(void)
-{
- #ifndef LTC_TEST
- return CRYPT_NOP;
- #else
- static const unsigned char sk128_pt[] = { 1, 2, 3, 4, 5, 6, 7, 8 },
- sk128_key[] = { 1, 2, 3, 4, 5, 6, 7, 8,
- 0, 0, 0, 0, 0, 0, 0, 0 },
- sk128_ct[] = { 255, 120, 17, 228, 179, 167, 46, 113 };
-
- symmetric_key skey;
- unsigned char buf[2][8];
- int err, y;
-
- /* test SK128 */
- if ((err = safer_sk128_setup(sk128_key, 16, 0, &skey)) != CRYPT_OK) {
- return err;
- }
- safer_ecb_encrypt(sk128_pt, buf[0], &skey);
- safer_ecb_decrypt(buf[0], buf[1], &skey);
-
- if (compare_testvector(buf[0], 8, sk128_ct, 8, "Safer SK128 Encrypt", 0) != 0 ||
- compare_testvector(buf[1], 8, sk128_pt, 8, "Safer SK128 Decrypt", 0) != 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++) buf[0][y] = 0;
- for (y = 0; y < 1000; y++) safer_ecb_encrypt(buf[0], buf[0], &skey);
- for (y = 0; y < 1000; y++) safer_ecb_decrypt(buf[0], buf[0], &skey);
- for (y = 0; y < 8; y++) if (buf[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
-
- return CRYPT_OK;
- #endif
-}
-
-#endif
-
-
-
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */
projects / zpackage / blobdiff