safer.c

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   return CRYPT_OK;
}

#ifdef LTC_CLEAN_STACK
static void _safer_ecb_encrypt(const unsigned char *block_in,
                             unsigned char *block_out,
                             symmetric_key *skey)
#else
void 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;
}

#ifdef LTC_CLEAN_STACK
void safer_ecb_encrypt(const unsigned char *block_in,
                             unsigned char *block_out,
                             symmetric_key *skey)
{
    _safer_ecb_encrypt(block_in, block_out, skey);
    burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
}
#endif

#ifdef LTC_CLEAN_STACK
static void _safer_ecb_decrypt(const unsigned char *block_in,
                             unsigned char *block_out,
                             symmetric_key *skey)
#else
void 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;
}

#ifdef LTC_CLEAN_STACK
void safer_ecb_decrypt(const unsigned char *block_in,
                             unsigned char *block_out,
                             symmetric_key *skey)
{
    _safer_ecb_decrypt(block_in, block_out, skey);
    burn_stack(sizeof(unsigned char) * 9 + sizeof(unsigned int) + sizeof(unsigned char *));
}
#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 (memcmp(buf[0], k64_ct, 8) != 0 || memcmp(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 (memcmp(buf[0], sk64_ct, 8) != 0 || memcmp(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 (memcmp(buf[0], sk128_ct, 8) != 0 || memcmp(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: 1.8 $ */
/* $Date: 2005/05/05 14:35:58 $ */