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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://libtomcrypt.com
+ */
+
+/*******************************************************************************
+*
+* FILE: safer.c
+*
+* DESCRIPTION: block-cipher algorithm SAFER (Secure And Fast Encryption
+* Routine) in its four versions: SAFER K-64, SAFER K-128,
+* SAFER SK-64 and 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 SAFER
+
+const struct ltc_cipher_descriptor
+ safer_k64_desc = {
+ "safer-k64",
+ 8, 8, 8, 8, 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
+ },
+
+ safer_sk64_desc = {
+ "safer-sk64",
+ 9, 8, 8, 8, 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
+ },
+
+ safer_k128_desc = {
+ "safer-k128",
+ 10, 16, 16, 8, 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
+ },
+
+ safer_sk128_desc = {
+ "safer-sk128",
+ 11, 16, 16, 8, 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
+ };
+
+/******************* 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 ****************************************************/
+extern const unsigned char safer_ebox[], safer_lbox[];
+
+#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[SAFER_BLOCK_LEN + 1];
+ unsigned char kb[SAFER_BLOCK_LEN + 1];
+
+ if (SAFER_MAX_NOF_ROUNDS < nof_rounds)
+ nof_rounds = SAFER_MAX_NOF_ROUNDS;
+ *key++ = (unsigned char)nof_rounds;
+ ka[SAFER_BLOCK_LEN] = (unsigned char)0;
+ kb[SAFER_BLOCK_LEN] = (unsigned char)0;
+ k = 0;
+ for (j = 0; j < SAFER_BLOCK_LEN; j++) {
+ ka[j] = ROL8(userkey_1[j], 5);
+ ka[SAFER_BLOCK_LEN] ^= ka[j];
+ kb[j] = *key++ = userkey_2[j];
+ kb[SAFER_BLOCK_LEN] ^= kb[j];
+ }
+ for (i = 1; i <= nof_rounds; i++) {
+ for (j = 0; j < 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 >= (SAFER_BLOCK_LEN + 1)) { k -= SAFER_BLOCK_LEN + 1; }
+ }
+ for (j = 0; j < SAFER_BLOCK_LEN; j++) {
+ if (strengthened) {
+ *key++ = (ka[k]
+ + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 1)&0xFF)]]) & 0xFF;
+ if (++k == (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 >= (SAFER_BLOCK_LEN + 1)) { k -= SAFER_BLOCK_LEN + 1; }
+ }
+ for (j = 0; j < SAFER_BLOCK_LEN; j++) {
+ if (strengthened) {
+ *key++ = (kb[k]
+ + safer_ebox[(int)safer_ebox[(int)((18 * i + j + 10)&0xFF)]]) & 0xFF;
+ if (++k == (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 * (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 > 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: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 > 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: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 > 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: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 > 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: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 (SAFER_MAX_NOF_ROUNDS < (round = *key)) round = 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 (SAFER_MAX_NOF_ROUNDS < (round = *key)) round = SAFER_MAX_NOF_ROUNDS;
+ key += 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 (XMEMCMP(buf[0], k64_ct, 8) != 0 || XMEMCMP(buf[1], k64_pt, 8) != 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 (XMEMCMP(buf[0], sk64_ct, 8) != 0 || XMEMCMP(buf[1], sk64_pt, 8) != 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)
+{
+}
+
+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 (XMEMCMP(buf[0], sk128_ct, 8) != 0 || XMEMCMP(buf[1], sk128_pt, 8) != 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
+
+
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/ciphers/safer/safer.c,v $ */
+/* $Revision: 1.13 $ */
+/* $Date: 2006/11/08 23:01:06 $ */
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