lib/silccrypt/cast5.c

   1 /* Taken from public domain libtomcrypt library and the code and all changes
   2    to it are in public domain. -Pekka */
   3
   4 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
   5
   6 #include "silccrypto.h"
   7 #include "cast5_internal.h"
   8 #include "cast5.h"
   9
  10 /*
  11  * SILC Crypto API for CAST-128
  12  */
  13
  14 /* Sets the key for the cipher. */
  15
  16 SILC_CIPHER_API_SET_KEY(cast5)
  17 {
  18   return cast5_setup(key, keylen, 0, (cast5_key *)context);
  19 }
  20
  21 /* Sets IV for the cipher. */
  22
  23 SILC_CIPHER_API_SET_IV(cast5)
  24 {
  25   cast5_key *cast5 = context;
  26
  27   switch (ops->mode) {
  28
  29   case SILC_CIPHER_MODE_CTR:
  30   case SILC_CIPHER_MODE_CFB:
  31     /* Starts new block. */
  32     cast5->padlen = 8;
  33     break;
  34
  35   default:
  36     break;
  37   }
  38 }
  39
  40 /* Initialize */
  41
  42 SILC_CIPHER_API_INIT(cast5)
  43 {
  44   cast5_key *cast5 = silc_calloc(1, sizeof(cast5_key));
  45   if (cast5)
  46     cast5->padlen = 8;
  47   return cast5;
  48 }
  49
  50 /* Uninitialize */
  51
  52 SILC_CIPHER_API_UNINIT(cast5)
  53 {
  54   cast5_key *cast5 = context;
  55   memset(cast5, 0, sizeof(*cast5));
  56   silc_free(cast5);
  57 }
  58
  59 SILC_CIPHER_API_ENCRYPT(cast5)
  60 {
  61   cast5_key *cast5 = context;
  62   SilcUInt32 tmp[2];
  63   int i;
  64
  65   switch (ops->mode) {
  66
  67   case SILC_CIPHER_MODE_CTR:
  68     SILC_CTR_MSB_64_32(iv, tmp, cipher->block, cast5->padlen, src, dst,
  69                        cast5_encrypt(cast5, tmp, tmp));
  70     break;
  71
  72   case SILC_CIPHER_MODE_ECB:
  73     {
  74       SilcUInt32 nb = len >> 3;
  75
  76       while (nb--) {
  77         SILC_GET32_MSB(tmp[0], src);
  78         SILC_GET32_MSB(tmp[1], src + 4);
  79         cast5_encrypt(cast5, tmp, tmp);
  80         SILC_PUT32_MSB(tmp[0], dst);
  81         SILC_PUT32_MSB(tmp[1], dst + 4);
  82         src += 8;
  83         dst += 8;
  84       }
  85     }
  86     break;
  87
  88   case SILC_CIPHER_MODE_CBC:
  89     SILC_CBC_ENC_MSB_64_32(len, iv, tmp, src, dst, i,
  90                            cast5_encrypt(cast5, tmp, tmp));
  91     break;
  92
  93   case SILC_CIPHER_MODE_CFB:
  94     SILC_CFB_ENC_MSB_64_32(iv, tmp, cast5->padlen, src, dst,
  95                            cast5_encrypt(cast5, tmp, tmp));
  96     break;
  97
  98   default:
  99     return FALSE;
 100   }
 101
 102   return TRUE;
 103 }
 104
 105 SILC_CIPHER_API_DECRYPT(cast5)
 106 {
 107   cast5_key *cast5 = context;
 108   SilcUInt32 tmp[2], tmp2[2], tiv[2];
 109   int i;
 110
 111   switch (ops->mode) {
 112
 113   case SILC_CIPHER_MODE_CTR:
 114     return silc_cast5_encrypt(cipher, ops, context, src, dst, len, iv);
 115     break;
 116
 117   case SILC_CIPHER_MODE_ECB:
 118     {
 119       SilcUInt32 nb = len >> 3;
 120
 121       while (nb--) {
 122         SILC_GET32_LSB(tmp[0], src);
 123         SILC_GET32_LSB(tmp[1], src + 4);
 124         cast5_decrypt(cast5, tmp, tmp);
 125         SILC_PUT32_LSB(tmp[0], dst);
 126         SILC_PUT32_LSB(tmp[1], dst + 4);
 127         src += 8;
 128         dst += 8;
 129       }
 130     }
 131     break;
 132
 133   case SILC_CIPHER_MODE_CBC:
 134     SILC_CBC_DEC_MSB_64_32(len, iv, tiv, tmp, tmp2, src, dst, i,
 135                            cast5_decrypt(cast5, tmp, tmp2));
 136     break;
 137
 138   case SILC_CIPHER_MODE_CFB:
 139     SILC_CFB_DEC_MSB_64_32(iv, tmp, cast5->padlen, src, dst,
 140                            cast5_encrypt(cast5, tmp, tmp));
 141     break;
 142
 143   default:
 144     return FALSE;
 145   }
 146
 147   return TRUE;
 148 }
 149
 150 /****************************************************************************/
 151
 152 static const SilcUInt32 S1[256] = {
 153 0x30fb40d4UL, 0x9fa0ff0bUL, 0x6beccd2fUL, 0x3f258c7aUL, 0x1e213f2fUL, 0x9c004dd3UL,
 154 0x6003e540UL, 0xcf9fc949UL, 0xbfd4af27UL, 0x88bbbdb5UL, 0xe2034090UL, 0x98d09675UL,
 155 0x6e63a0e0UL, 0x15c361d2UL, 0xc2e7661dUL, 0x22d4ff8eUL, 0x28683b6fUL, 0xc07fd059UL,
 156 0xff2379c8UL, 0x775f50e2UL, 0x43c340d3UL, 0xdf2f8656UL, 0x887ca41aUL, 0xa2d2bd2dUL,
 157 0xa1c9e0d6UL, 0x346c4819UL, 0x61b76d87UL, 0x22540f2fUL, 0x2abe32e1UL, 0xaa54166bUL,
 158 0x22568e3aUL, 0xa2d341d0UL, 0x66db40c8UL, 0xa784392fUL, 0x004dff2fUL, 0x2db9d2deUL,
 159 0x97943facUL, 0x4a97c1d8UL, 0x527644b7UL, 0xb5f437a7UL, 0xb82cbaefUL, 0xd751d159UL,
 160 0x6ff7f0edUL, 0x5a097a1fUL, 0x827b68d0UL, 0x90ecf52eUL, 0x22b0c054UL, 0xbc8e5935UL,
 161 0x4b6d2f7fUL, 0x50bb64a2UL, 0xd2664910UL, 0xbee5812dUL, 0xb7332290UL, 0xe93b159fUL,
 162 0xb48ee411UL, 0x4bff345dUL, 0xfd45c240UL, 0xad31973fUL, 0xc4f6d02eUL, 0x55fc8165UL,
 163 0xd5b1caadUL, 0xa1ac2daeUL, 0xa2d4b76dUL, 0xc19b0c50UL, 0x882240f2UL, 0x0c6e4f38UL,
 164 0xa4e4bfd7UL, 0x4f5ba272UL, 0x564c1d2fUL, 0xc59c5319UL, 0xb949e354UL, 0xb04669feUL,
 165 0xb1b6ab8aUL, 0xc71358ddUL, 0x6385c545UL, 0x110f935dUL, 0x57538ad5UL, 0x6a390493UL,
 166 0xe63d37e0UL, 0x2a54f6b3UL, 0x3a787d5fUL, 0x6276a0b5UL, 0x19a6fcdfUL, 0x7a42206aUL,
 167 0x29f9d4d5UL, 0xf61b1891UL, 0xbb72275eUL, 0xaa508167UL, 0x38901091UL, 0xc6b505ebUL,
 168 0x84c7cb8cUL, 0x2ad75a0fUL, 0x874a1427UL, 0xa2d1936bUL, 0x2ad286afUL, 0xaa56d291UL,
 169 0xd7894360UL, 0x425c750dUL, 0x93b39e26UL, 0x187184c9UL, 0x6c00b32dUL, 0x73e2bb14UL,
 170 0xa0bebc3cUL, 0x54623779UL, 0x64459eabUL, 0x3f328b82UL, 0x7718cf82UL, 0x59a2cea6UL,
 171 0x04ee002eUL, 0x89fe78e6UL, 0x3fab0950UL, 0x325ff6c2UL, 0x81383f05UL, 0x6963c5c8UL,
 172 0x76cb5ad6UL, 0xd49974c9UL, 0xca180dcfUL, 0x380782d5UL, 0xc7fa5cf6UL, 0x8ac31511UL,
 173 0x35e79e13UL, 0x47da91d0UL, 0xf40f9086UL, 0xa7e2419eUL, 0x31366241UL, 0x051ef495UL,
 174 0xaa573b04UL, 0x4a805d8dUL, 0x548300d0UL, 0x00322a3cUL, 0xbf64cddfUL, 0xba57a68eUL,
 175 0x75c6372bUL, 0x50afd341UL, 0xa7c13275UL, 0x915a0bf5UL, 0x6b54bfabUL, 0x2b0b1426UL,
 176 0xab4cc9d7UL, 0x449ccd82UL, 0xf7fbf265UL, 0xab85c5f3UL, 0x1b55db94UL, 0xaad4e324UL,
 177 0xcfa4bd3fUL, 0x2deaa3e2UL, 0x9e204d02UL, 0xc8bd25acUL, 0xeadf55b3UL, 0xd5bd9e98UL,
 178 0xe31231b2UL, 0x2ad5ad6cUL, 0x954329deUL, 0xadbe4528UL, 0xd8710f69UL, 0xaa51c90fUL,
 179 0xaa786bf6UL, 0x22513f1eUL, 0xaa51a79bUL, 0x2ad344ccUL, 0x7b5a41f0UL, 0xd37cfbadUL,
 180 0x1b069505UL, 0x41ece491UL, 0xb4c332e6UL, 0x032268d4UL, 0xc9600accUL, 0xce387e6dUL,
 181 0xbf6bb16cUL, 0x6a70fb78UL, 0x0d03d9c9UL, 0xd4df39deUL, 0xe01063daUL, 0x4736f464UL,
 182 0x5ad328d8UL, 0xb347cc96UL, 0x75bb0fc3UL, 0x98511bfbUL, 0x4ffbcc35UL, 0xb58bcf6aUL,
 183 0xe11f0abcUL, 0xbfc5fe4aUL, 0xa70aec10UL, 0xac39570aUL, 0x3f04442fUL, 0x6188b153UL,
 184 0xe0397a2eUL, 0x5727cb79UL, 0x9ceb418fUL, 0x1cacd68dUL, 0x2ad37c96UL, 0x0175cb9dUL,
 185 0xc69dff09UL, 0xc75b65f0UL, 0xd9db40d8UL, 0xec0e7779UL, 0x4744ead4UL, 0xb11c3274UL,
 186 0xdd24cb9eUL, 0x7e1c54bdUL, 0xf01144f9UL, 0xd2240eb1UL, 0x9675b3fdUL, 0xa3ac3755UL,
 187 0xd47c27afUL, 0x51c85f4dUL, 0x56907596UL, 0xa5bb15e6UL, 0x580304f0UL, 0xca042cf1UL,
 188 0x011a37eaUL, 0x8dbfaadbUL, 0x35ba3e4aUL, 0x3526ffa0UL, 0xc37b4d09UL, 0xbc306ed9UL,
 189 0x98a52666UL, 0x5648f725UL, 0xff5e569dUL, 0x0ced63d0UL, 0x7c63b2cfUL, 0x700b45e1UL,
 190 0xd5ea50f1UL, 0x85a92872UL, 0xaf1fbda7UL, 0xd4234870UL, 0xa7870bf3UL, 0x2d3b4d79UL,
 191 0x42e04198UL, 0x0cd0ede7UL, 0x26470db8UL, 0xf881814cUL, 0x474d6ad7UL, 0x7c0c5e5cUL,
 192 0xd1231959UL, 0x381b7298UL, 0xf5d2f4dbUL, 0xab838653UL, 0x6e2f1e23UL, 0x83719c9eUL,
 193 0xbd91e046UL, 0x9a56456eUL, 0xdc39200cUL, 0x20c8c571UL, 0x962bda1cUL, 0xe1e696ffUL,
 194 0xb141ab08UL, 0x7cca89b9UL, 0x1a69e783UL, 0x02cc4843UL, 0xa2f7c579UL, 0x429ef47dUL,
 195 0x427b169cUL, 0x5ac9f049UL, 0xdd8f0f00UL, 0x5c8165bfUL};
 196
 197 static const SilcUInt32 S2[256] = {
 198 0x1f201094UL, 0xef0ba75bUL, 0x69e3cf7eUL, 0x393f4380UL, 0xfe61cf7aUL, 0xeec5207aUL,
 199 0x55889c94UL, 0x72fc0651UL, 0xada7ef79UL, 0x4e1d7235UL, 0xd55a63ceUL, 0xde0436baUL,
 200 0x99c430efUL, 0x5f0c0794UL, 0x18dcdb7dUL, 0xa1d6eff3UL, 0xa0b52f7bUL, 0x59e83605UL,
 201 0xee15b094UL, 0xe9ffd909UL, 0xdc440086UL, 0xef944459UL, 0xba83ccb3UL, 0xe0c3cdfbUL,
 202 0xd1da4181UL, 0x3b092ab1UL, 0xf997f1c1UL, 0xa5e6cf7bUL, 0x01420ddbUL, 0xe4e7ef5bUL,
 203 0x25a1ff41UL, 0xe180f806UL, 0x1fc41080UL, 0x179bee7aUL, 0xd37ac6a9UL, 0xfe5830a4UL,
 204 0x98de8b7fUL, 0x77e83f4eUL, 0x79929269UL, 0x24fa9f7bUL, 0xe113c85bUL, 0xacc40083UL,
 205 0xd7503525UL, 0xf7ea615fUL, 0x62143154UL, 0x0d554b63UL, 0x5d681121UL, 0xc866c359UL,
 206 0x3d63cf73UL, 0xcee234c0UL, 0xd4d87e87UL, 0x5c672b21UL, 0x071f6181UL, 0x39f7627fUL,
 207 0x361e3084UL, 0xe4eb573bUL, 0x602f64a4UL, 0xd63acd9cUL, 0x1bbc4635UL, 0x9e81032dUL,
 208 0x2701f50cUL, 0x99847ab4UL, 0xa0e3df79UL, 0xba6cf38cUL, 0x10843094UL, 0x2537a95eUL,
 209 0xf46f6ffeUL, 0xa1ff3b1fUL, 0x208cfb6aUL, 0x8f458c74UL, 0xd9e0a227UL, 0x4ec73a34UL,
 210 0xfc884f69UL, 0x3e4de8dfUL, 0xef0e0088UL, 0x3559648dUL, 0x8a45388cUL, 0x1d804366UL,
 211 0x721d9bfdUL, 0xa58684bbUL, 0xe8256333UL, 0x844e8212UL, 0x128d8098UL, 0xfed33fb4UL,
 212 0xce280ae1UL, 0x27e19ba5UL, 0xd5a6c252UL, 0xe49754bdUL, 0xc5d655ddUL, 0xeb667064UL,
 213 0x77840b4dUL, 0xa1b6a801UL, 0x84db26a9UL, 0xe0b56714UL, 0x21f043b7UL, 0xe5d05860UL,
 214 0x54f03084UL, 0x066ff472UL, 0xa31aa153UL, 0xdadc4755UL, 0xb5625dbfUL, 0x68561be6UL,
 215 0x83ca6b94UL, 0x2d6ed23bUL, 0xeccf01dbUL, 0xa6d3d0baUL, 0xb6803d5cUL, 0xaf77a709UL,
 216 0x33b4a34cUL, 0x397bc8d6UL, 0x5ee22b95UL, 0x5f0e5304UL, 0x81ed6f61UL, 0x20e74364UL,
 217 0xb45e1378UL, 0xde18639bUL, 0x881ca122UL, 0xb96726d1UL, 0x8049a7e8UL, 0x22b7da7bUL,
 218 0x5e552d25UL, 0x5272d237UL, 0x79d2951cUL, 0xc60d894cUL, 0x488cb402UL, 0x1ba4fe5bUL,
 219 0xa4b09f6bUL, 0x1ca815cfUL, 0xa20c3005UL, 0x8871df63UL, 0xb9de2fcbUL, 0x0cc6c9e9UL,
 220 0x0beeff53UL, 0xe3214517UL, 0xb4542835UL, 0x9f63293cUL, 0xee41e729UL, 0x6e1d2d7cUL,
 221 0x50045286UL, 0x1e6685f3UL, 0xf33401c6UL, 0x30a22c95UL, 0x31a70850UL, 0x60930f13UL,
 222 0x73f98417UL, 0xa1269859UL, 0xec645c44UL, 0x52c877a9UL, 0xcdff33a6UL, 0xa02b1741UL,
 223 0x7cbad9a2UL, 0x2180036fUL, 0x50d99c08UL, 0xcb3f4861UL, 0xc26bd765UL, 0x64a3f6abUL,
 224 0x80342676UL, 0x25a75e7bUL, 0xe4e6d1fcUL, 0x20c710e6UL, 0xcdf0b680UL, 0x17844d3bUL,
 225 0x31eef84dUL, 0x7e0824e4UL, 0x2ccb49ebUL, 0x846a3baeUL, 0x8ff77888UL, 0xee5d60f6UL,
 226 0x7af75673UL, 0x2fdd5cdbUL, 0xa11631c1UL, 0x30f66f43UL, 0xb3faec54UL, 0x157fd7faUL,
 227 0xef8579ccUL, 0xd152de58UL, 0xdb2ffd5eUL, 0x8f32ce19UL, 0x306af97aUL, 0x02f03ef8UL,
 228 0x99319ad5UL, 0xc242fa0fUL, 0xa7e3ebb0UL, 0xc68e4906UL, 0xb8da230cUL, 0x80823028UL,
 229 0xdcdef3c8UL, 0xd35fb171UL, 0x088a1bc8UL, 0xbec0c560UL, 0x61a3c9e8UL, 0xbca8f54dUL,
 230 0xc72feffaUL, 0x22822e99UL, 0x82c570b4UL, 0xd8d94e89UL, 0x8b1c34bcUL, 0x301e16e6UL,
 231 0x273be979UL, 0xb0ffeaa6UL, 0x61d9b8c6UL, 0x00b24869UL, 0xb7ffce3fUL, 0x08dc283bUL,
 232 0x43daf65aUL, 0xf7e19798UL, 0x7619b72fUL, 0x8f1c9ba4UL, 0xdc8637a0UL, 0x16a7d3b1UL,
 233 0x9fc393b7UL, 0xa7136eebUL, 0xc6bcc63eUL, 0x1a513742UL, 0xef6828bcUL, 0x520365d6UL,
 234 0x2d6a77abUL, 0x3527ed4bUL, 0x821fd216UL, 0x095c6e2eUL, 0xdb92f2fbUL, 0x5eea29cbUL,
 235 0x145892f5UL, 0x91584f7fUL, 0x5483697bUL, 0x2667a8ccUL, 0x85196048UL, 0x8c4baceaUL,
 236 0x833860d4UL, 0x0d23e0f9UL, 0x6c387e8aUL, 0x0ae6d249UL, 0xb284600cUL, 0xd835731dUL,
 237 0xdcb1c647UL, 0xac4c56eaUL, 0x3ebd81b3UL, 0x230eabb0UL, 0x6438bc87UL, 0xf0b5b1faUL,
 238 0x8f5ea2b3UL, 0xfc184642UL, 0x0a036b7aUL, 0x4fb089bdUL, 0x649da589UL, 0xa345415eUL,
 239 0x5c038323UL, 0x3e5d3bb9UL, 0x43d79572UL, 0x7e6dd07cUL, 0x06dfdf1eUL, 0x6c6cc4efUL,
 240 0x7160a539UL, 0x73bfbe70UL, 0x83877605UL, 0x4523ecf1UL};
 241
 242 static const SilcUInt32 S3[256] = {
 243 0x8defc240UL, 0x25fa5d9fUL, 0xeb903dbfUL, 0xe810c907UL, 0x47607fffUL, 0x369fe44bUL,
 244 0x8c1fc644UL, 0xaececa90UL, 0xbeb1f9bfUL, 0xeefbcaeaUL, 0xe8cf1950UL, 0x51df07aeUL,
 245 0x920e8806UL, 0xf0ad0548UL, 0xe13c8d83UL, 0x927010d5UL, 0x11107d9fUL, 0x07647db9UL,
 246 0xb2e3e4d4UL, 0x3d4f285eUL, 0xb9afa820UL, 0xfade82e0UL, 0xa067268bUL, 0x8272792eUL,
 247 0x553fb2c0UL, 0x489ae22bUL, 0xd4ef9794UL, 0x125e3fbcUL, 0x21fffceeUL, 0x825b1bfdUL,
 248 0x9255c5edUL, 0x1257a240UL, 0x4e1a8302UL, 0xbae07fffUL, 0x528246e7UL, 0x8e57140eUL,
 249 0x3373f7bfUL, 0x8c9f8188UL, 0xa6fc4ee8UL, 0xc982b5a5UL, 0xa8c01db7UL, 0x579fc264UL,
 250 0x67094f31UL, 0xf2bd3f5fUL, 0x40fff7c1UL, 0x1fb78dfcUL, 0x8e6bd2c1UL, 0x437be59bUL,
 251 0x99b03dbfUL, 0xb5dbc64bUL, 0x638dc0e6UL, 0x55819d99UL, 0xa197c81cUL, 0x4a012d6eUL,
 252 0xc5884a28UL, 0xccc36f71UL, 0xb843c213UL, 0x6c0743f1UL, 0x8309893cUL, 0x0feddd5fUL,
 253 0x2f7fe850UL, 0xd7c07f7eUL, 0x02507fbfUL, 0x5afb9a04UL, 0xa747d2d0UL, 0x1651192eUL,
 254 0xaf70bf3eUL, 0x58c31380UL, 0x5f98302eUL, 0x727cc3c4UL, 0x0a0fb402UL, 0x0f7fef82UL,
 255 0x8c96fdadUL, 0x5d2c2aaeUL, 0x8ee99a49UL, 0x50da88b8UL, 0x8427f4a0UL, 0x1eac5790UL,
 256 0x796fb449UL, 0x8252dc15UL, 0xefbd7d9bUL, 0xa672597dUL, 0xada840d8UL, 0x45f54504UL,
 257 0xfa5d7403UL, 0xe83ec305UL, 0x4f91751aUL, 0x925669c2UL, 0x23efe941UL, 0xa903f12eUL,
 258 0x60270df2UL, 0x0276e4b6UL, 0x94fd6574UL, 0x927985b2UL, 0x8276dbcbUL, 0x02778176UL,
 259 0xf8af918dUL, 0x4e48f79eUL, 0x8f616ddfUL, 0xe29d840eUL, 0x842f7d83UL, 0x340ce5c8UL,
 260 0x96bbb682UL, 0x93b4b148UL, 0xef303cabUL, 0x984faf28UL, 0x779faf9bUL, 0x92dc560dUL,
 261 0x224d1e20UL, 0x8437aa88UL, 0x7d29dc96UL, 0x2756d3dcUL, 0x8b907ceeUL, 0xb51fd240UL,
 262 0xe7c07ce3UL, 0xe566b4a1UL, 0xc3e9615eUL, 0x3cf8209dUL, 0x6094d1e3UL, 0xcd9ca341UL,
 263 0x5c76460eUL, 0x00ea983bUL, 0xd4d67881UL, 0xfd47572cUL, 0xf76cedd9UL, 0xbda8229cUL,
 264 0x127dadaaUL, 0x438a074eUL, 0x1f97c090UL, 0x081bdb8aUL, 0x93a07ebeUL, 0xb938ca15UL,
 265 0x97b03cffUL, 0x3dc2c0f8UL, 0x8d1ab2ecUL, 0x64380e51UL, 0x68cc7bfbUL, 0xd90f2788UL,
 266 0x12490181UL, 0x5de5ffd4UL, 0xdd7ef86aUL, 0x76a2e214UL, 0xb9a40368UL, 0x925d958fUL,
 267 0x4b39fffaUL, 0xba39aee9UL, 0xa4ffd30bUL, 0xfaf7933bUL, 0x6d498623UL, 0x193cbcfaUL,
 268 0x27627545UL, 0x825cf47aUL, 0x61bd8ba0UL, 0xd11e42d1UL, 0xcead04f4UL, 0x127ea392UL,
 269 0x10428db7UL, 0x8272a972UL, 0x9270c4a8UL, 0x127de50bUL, 0x285ba1c8UL, 0x3c62f44fUL,
 270 0x35c0eaa5UL, 0xe805d231UL, 0x428929fbUL, 0xb4fcdf82UL, 0x4fb66a53UL, 0x0e7dc15bUL,
 271 0x1f081fabUL, 0x108618aeUL, 0xfcfd086dUL, 0xf9ff2889UL, 0x694bcc11UL, 0x236a5caeUL,
 272 0x12deca4dUL, 0x2c3f8cc5UL, 0xd2d02dfeUL, 0xf8ef5896UL, 0xe4cf52daUL, 0x95155b67UL,
 273 0x494a488cUL, 0xb9b6a80cUL, 0x5c8f82bcUL, 0x89d36b45UL, 0x3a609437UL, 0xec00c9a9UL,
 274 0x44715253UL, 0x0a874b49UL, 0xd773bc40UL, 0x7c34671cUL, 0x02717ef6UL, 0x4feb5536UL,
 275 0xa2d02fffUL, 0xd2bf60c4UL, 0xd43f03c0UL, 0x50b4ef6dUL, 0x07478cd1UL, 0x006e1888UL,
 276 0xa2e53f55UL, 0xb9e6d4bcUL, 0xa2048016UL, 0x97573833UL, 0xd7207d67UL, 0xde0f8f3dUL,
 277 0x72f87b33UL, 0xabcc4f33UL, 0x7688c55dUL, 0x7b00a6b0UL, 0x947b0001UL, 0x570075d2UL,
 278 0xf9bb88f8UL, 0x8942019eUL, 0x4264a5ffUL, 0x856302e0UL, 0x72dbd92bUL, 0xee971b69UL,
 279 0x6ea22fdeUL, 0x5f08ae2bUL, 0xaf7a616dUL, 0xe5c98767UL, 0xcf1febd2UL, 0x61efc8c2UL,
 280 0xf1ac2571UL, 0xcc8239c2UL, 0x67214cb8UL, 0xb1e583d1UL, 0xb7dc3e62UL, 0x7f10bdceUL,
 281 0xf90a5c38UL, 0x0ff0443dUL, 0x606e6dc6UL, 0x60543a49UL, 0x5727c148UL, 0x2be98a1dUL,
 282 0x8ab41738UL, 0x20e1be24UL, 0xaf96da0fUL, 0x68458425UL, 0x99833be5UL, 0x600d457dUL,
 283 0x282f9350UL, 0x8334b362UL, 0xd91d1120UL, 0x2b6d8da0UL, 0x642b1e31UL, 0x9c305a00UL,
 284 0x52bce688UL, 0x1b03588aUL, 0xf7baefd5UL, 0x4142ed9cUL, 0xa4315c11UL, 0x83323ec5UL,
 285 0xdfef4636UL, 0xa133c501UL, 0xe9d3531cUL, 0xee353783UL};
 286
 287 static const SilcUInt32 S4[256] = {
 288 0x9db30420UL, 0x1fb6e9deUL, 0xa7be7befUL, 0xd273a298UL, 0x4a4f7bdbUL, 0x64ad8c57UL,
 289 0x85510443UL, 0xfa020ed1UL, 0x7e287affUL, 0xe60fb663UL, 0x095f35a1UL, 0x79ebf120UL,
 290 0xfd059d43UL, 0x6497b7b1UL, 0xf3641f63UL, 0x241e4adfUL, 0x28147f5fUL, 0x4fa2b8cdUL,
 291 0xc9430040UL, 0x0cc32220UL, 0xfdd30b30UL, 0xc0a5374fUL, 0x1d2d00d9UL, 0x24147b15UL,
 292 0xee4d111aUL, 0x0fca5167UL, 0x71ff904cUL, 0x2d195ffeUL, 0x1a05645fUL, 0x0c13fefeUL,
 293 0x081b08caUL, 0x05170121UL, 0x80530100UL, 0xe83e5efeUL, 0xac9af4f8UL, 0x7fe72701UL,
 294 0xd2b8ee5fUL, 0x06df4261UL, 0xbb9e9b8aUL, 0x7293ea25UL, 0xce84ffdfUL, 0xf5718801UL,
 295 0x3dd64b04UL, 0xa26f263bUL, 0x7ed48400UL, 0x547eebe6UL, 0x446d4ca0UL, 0x6cf3d6f5UL,
 296 0x2649abdfUL, 0xaea0c7f5UL, 0x36338cc1UL, 0x503f7e93UL, 0xd3772061UL, 0x11b638e1UL,
 297 0x72500e03UL, 0xf80eb2bbUL, 0xabe0502eUL, 0xec8d77deUL, 0x57971e81UL, 0xe14f6746UL,
 298 0xc9335400UL, 0x6920318fUL, 0x081dbb99UL, 0xffc304a5UL, 0x4d351805UL, 0x7f3d5ce3UL,
 299 0xa6c866c6UL, 0x5d5bcca9UL, 0xdaec6feaUL, 0x9f926f91UL, 0x9f46222fUL, 0x3991467dUL,
 300 0xa5bf6d8eUL, 0x1143c44fUL, 0x43958302UL, 0xd0214eebUL, 0x022083b8UL, 0x3fb6180cUL,
 301 0x18f8931eUL, 0x281658e6UL, 0x26486e3eUL, 0x8bd78a70UL, 0x7477e4c1UL, 0xb506e07cUL,
 302 0xf32d0a25UL, 0x79098b02UL, 0xe4eabb81UL, 0x28123b23UL, 0x69dead38UL, 0x1574ca16UL,
 303 0xdf871b62UL, 0x211c40b7UL, 0xa51a9ef9UL, 0x0014377bUL, 0x041e8ac8UL, 0x09114003UL,
 304 0xbd59e4d2UL, 0xe3d156d5UL, 0x4fe876d5UL, 0x2f91a340UL, 0x557be8deUL, 0x00eae4a7UL,
 305 0x0ce5c2ecUL, 0x4db4bba6UL, 0xe756bdffUL, 0xdd3369acUL, 0xec17b035UL, 0x06572327UL,
 306 0x99afc8b0UL, 0x56c8c391UL, 0x6b65811cUL, 0x5e146119UL, 0x6e85cb75UL, 0xbe07c002UL,
 307 0xc2325577UL, 0x893ff4ecUL, 0x5bbfc92dUL, 0xd0ec3b25UL, 0xb7801ab7UL, 0x8d6d3b24UL,
 308 0x20c763efUL, 0xc366a5fcUL, 0x9c382880UL, 0x0ace3205UL, 0xaac9548aUL, 0xeca1d7c7UL,
 309 0x041afa32UL, 0x1d16625aUL, 0x6701902cUL, 0x9b757a54UL, 0x31d477f7UL, 0x9126b031UL,
 310 0x36cc6fdbUL, 0xc70b8b46UL, 0xd9e66a48UL, 0x56e55a79UL, 0x026a4cebUL, 0x52437effUL,
 311 0x2f8f76b4UL, 0x0df980a5UL, 0x8674cde3UL, 0xedda04ebUL, 0x17a9be04UL, 0x2c18f4dfUL,
 312 0xb7747f9dUL, 0xab2af7b4UL, 0xefc34d20UL, 0x2e096b7cUL, 0x1741a254UL, 0xe5b6a035UL,
 313 0x213d42f6UL, 0x2c1c7c26UL, 0x61c2f50fUL, 0x6552daf9UL, 0xd2c231f8UL, 0x25130f69UL,
 314 0xd8167fa2UL, 0x0418f2c8UL, 0x001a96a6UL, 0x0d1526abUL, 0x63315c21UL, 0x5e0a72ecUL,
 315 0x49bafefdUL, 0x187908d9UL, 0x8d0dbd86UL, 0x311170a7UL, 0x3e9b640cUL, 0xcc3e10d7UL,
 316 0xd5cad3b6UL, 0x0caec388UL, 0xf73001e1UL, 0x6c728affUL, 0x71eae2a1UL, 0x1f9af36eUL,
 317 0xcfcbd12fUL, 0xc1de8417UL, 0xac07be6bUL, 0xcb44a1d8UL, 0x8b9b0f56UL, 0x013988c3UL,
 318 0xb1c52fcaUL, 0xb4be31cdUL, 0xd8782806UL, 0x12a3a4e2UL, 0x6f7de532UL, 0x58fd7eb6UL,
 319 0xd01ee900UL, 0x24adffc2UL, 0xf4990fc5UL, 0x9711aac5UL, 0x001d7b95UL, 0x82e5e7d2UL,
 320 0x109873f6UL, 0x00613096UL, 0xc32d9521UL, 0xada121ffUL, 0x29908415UL, 0x7fbb977fUL,
 321 0xaf9eb3dbUL, 0x29c9ed2aUL, 0x5ce2a465UL, 0xa730f32cUL, 0xd0aa3fe8UL, 0x8a5cc091UL,
 322 0xd49e2ce7UL, 0x0ce454a9UL, 0xd60acd86UL, 0x015f1919UL, 0x77079103UL, 0xdea03af6UL,
 323 0x78a8565eUL, 0xdee356dfUL, 0x21f05cbeUL, 0x8b75e387UL, 0xb3c50651UL, 0xb8a5c3efUL,
 324 0xd8eeb6d2UL, 0xe523be77UL, 0xc2154529UL, 0x2f69efdfUL, 0xafe67afbUL, 0xf470c4b2UL,
 325 0xf3e0eb5bUL, 0xd6cc9876UL, 0x39e4460cUL, 0x1fda8538UL, 0x1987832fUL, 0xca007367UL,
 326 0xa99144f8UL, 0x296b299eUL, 0x492fc295UL, 0x9266beabUL, 0xb5676e69UL, 0x9bd3dddaUL,
 327 0xdf7e052fUL, 0xdb25701cUL, 0x1b5e51eeUL, 0xf65324e6UL, 0x6afce36cUL, 0x0316cc04UL,
 328 0x8644213eUL, 0xb7dc59d0UL, 0x7965291fUL, 0xccd6fd43UL, 0x41823979UL, 0x932bcdf6UL,
 329 0xb657c34dUL, 0x4edfd282UL, 0x7ae5290cUL, 0x3cb9536bUL, 0x851e20feUL, 0x9833557eUL,
 330 0x13ecf0b0UL, 0xd3ffb372UL, 0x3f85c5c1UL, 0x0aef7ed2UL};
 331
 332 static const SilcUInt32 S5[256] = {
 333 0x7ec90c04UL, 0x2c6e74b9UL, 0x9b0e66dfUL, 0xa6337911UL, 0xb86a7fffUL, 0x1dd358f5UL,
 334 0x44dd9d44UL, 0x1731167fUL, 0x08fbf1faUL, 0xe7f511ccUL, 0xd2051b00UL, 0x735aba00UL,
 335 0x2ab722d8UL, 0x386381cbUL, 0xacf6243aUL, 0x69befd7aUL, 0xe6a2e77fUL, 0xf0c720cdUL,
 336 0xc4494816UL, 0xccf5c180UL, 0x38851640UL, 0x15b0a848UL, 0xe68b18cbUL, 0x4caadeffUL,
 337 0x5f480a01UL, 0x0412b2aaUL, 0x259814fcUL, 0x41d0efe2UL, 0x4e40b48dUL, 0x248eb6fbUL,
 338 0x8dba1cfeUL, 0x41a99b02UL, 0x1a550a04UL, 0xba8f65cbUL, 0x7251f4e7UL, 0x95a51725UL,
 339 0xc106ecd7UL, 0x97a5980aUL, 0xc539b9aaUL, 0x4d79fe6aUL, 0xf2f3f763UL, 0x68af8040UL,
 340 0xed0c9e56UL, 0x11b4958bUL, 0xe1eb5a88UL, 0x8709e6b0UL, 0xd7e07156UL, 0x4e29fea7UL,
 341 0x6366e52dUL, 0x02d1c000UL, 0xc4ac8e05UL, 0x9377f571UL, 0x0c05372aUL, 0x578535f2UL,
 342 0x2261be02UL, 0xd642a0c9UL, 0xdf13a280UL, 0x74b55bd2UL, 0x682199c0UL, 0xd421e5ecUL,
 343 0x53fb3ce8UL, 0xc8adedb3UL, 0x28a87fc9UL, 0x3d959981UL, 0x5c1ff900UL, 0xfe38d399UL,
 344 0x0c4eff0bUL, 0x062407eaUL, 0xaa2f4fb1UL, 0x4fb96976UL, 0x90c79505UL, 0xb0a8a774UL,
 345 0xef55a1ffUL, 0xe59ca2c2UL, 0xa6b62d27UL, 0xe66a4263UL, 0xdf65001fUL, 0x0ec50966UL,
 346 0xdfdd55bcUL, 0x29de0655UL, 0x911e739aUL, 0x17af8975UL, 0x32c7911cUL, 0x89f89468UL,
 347 0x0d01e980UL, 0x524755f4UL, 0x03b63cc9UL, 0x0cc844b2UL, 0xbcf3f0aaUL, 0x87ac36e9UL,
 348 0xe53a7426UL, 0x01b3d82bUL, 0x1a9e7449UL, 0x64ee2d7eUL, 0xcddbb1daUL, 0x01c94910UL,
 349 0xb868bf80UL, 0x0d26f3fdUL, 0x9342ede7UL, 0x04a5c284UL, 0x636737b6UL, 0x50f5b616UL,
 350 0xf24766e3UL, 0x8eca36c1UL, 0x136e05dbUL, 0xfef18391UL, 0xfb887a37UL, 0xd6e7f7d4UL,
 351 0xc7fb7dc9UL, 0x3063fcdfUL, 0xb6f589deUL, 0xec2941daUL, 0x26e46695UL, 0xb7566419UL,
 352 0xf654efc5UL, 0xd08d58b7UL, 0x48925401UL, 0xc1bacb7fUL, 0xe5ff550fUL, 0xb6083049UL,
 353 0x5bb5d0e8UL, 0x87d72e5aUL, 0xab6a6ee1UL, 0x223a66ceUL, 0xc62bf3cdUL, 0x9e0885f9UL,
 354 0x68cb3e47UL, 0x086c010fUL, 0xa21de820UL, 0xd18b69deUL, 0xf3f65777UL, 0xfa02c3f6UL,
 355 0x407edac3UL, 0xcbb3d550UL, 0x1793084dUL, 0xb0d70ebaUL, 0x0ab378d5UL, 0xd951fb0cUL,
 356 0xded7da56UL, 0x4124bbe4UL, 0x94ca0b56UL, 0x0f5755d1UL, 0xe0e1e56eUL, 0x6184b5beUL,
 357 0x580a249fUL, 0x94f74bc0UL, 0xe327888eUL, 0x9f7b5561UL, 0xc3dc0280UL, 0x05687715UL,
 358 0x646c6bd7UL, 0x44904db3UL, 0x66b4f0a3UL, 0xc0f1648aUL, 0x697ed5afUL, 0x49e92ff6UL,
 359 0x309e374fUL, 0x2cb6356aUL, 0x85808573UL, 0x4991f840UL, 0x76f0ae02UL, 0x083be84dUL,
 360 0x28421c9aUL, 0x44489406UL, 0x736e4cb8UL, 0xc1092910UL, 0x8bc95fc6UL, 0x7d869cf4UL,
 361 0x134f616fUL, 0x2e77118dUL, 0xb31b2be1UL, 0xaa90b472UL, 0x3ca5d717UL, 0x7d161bbaUL,
 362 0x9cad9010UL, 0xaf462ba2UL, 0x9fe459d2UL, 0x45d34559UL, 0xd9f2da13UL, 0xdbc65487UL,
 363 0xf3e4f94eUL, 0x176d486fUL, 0x097c13eaUL, 0x631da5c7UL, 0x445f7382UL, 0x175683f4UL,
 364 0xcdc66a97UL, 0x70be0288UL, 0xb3cdcf72UL, 0x6e5dd2f3UL, 0x20936079UL, 0x459b80a5UL,
 365 0xbe60e2dbUL, 0xa9c23101UL, 0xeba5315cUL, 0x224e42f2UL, 0x1c5c1572UL, 0xf6721b2cUL,
 366 0x1ad2fff3UL, 0x8c25404eUL, 0x324ed72fUL, 0x4067b7fdUL, 0x0523138eUL, 0x5ca3bc78UL,
 367 0xdc0fd66eUL, 0x75922283UL, 0x784d6b17UL, 0x58ebb16eUL, 0x44094f85UL, 0x3f481d87UL,
 368 0xfcfeae7bUL, 0x77b5ff76UL, 0x8c2302bfUL, 0xaaf47556UL, 0x5f46b02aUL, 0x2b092801UL,
 369 0x3d38f5f7UL, 0x0ca81f36UL, 0x52af4a8aUL, 0x66d5e7c0UL, 0xdf3b0874UL, 0x95055110UL,
 370 0x1b5ad7a8UL, 0xf61ed5adUL, 0x6cf6e479UL, 0x20758184UL, 0xd0cefa65UL, 0x88f7be58UL,
 371 0x4a046826UL, 0x0ff6f8f3UL, 0xa09c7f70UL, 0x5346aba0UL, 0x5ce96c28UL, 0xe176eda3UL,
 372 0x6bac307fUL, 0x376829d2UL, 0x85360fa9UL, 0x17e3fe2aUL, 0x24b79767UL, 0xf5a96b20UL,
 373 0xd6cd2595UL, 0x68ff1ebfUL, 0x7555442cUL, 0xf19f06beUL, 0xf9e0659aUL, 0xeeb9491dUL,
 374 0x34010718UL, 0xbb30cab8UL, 0xe822fe15UL, 0x88570983UL, 0x750e6249UL, 0xda627e55UL,
 375 0x5e76ffa8UL, 0xb1534546UL, 0x6d47de08UL, 0xefe9e7d4UL};
 376
 377 static const SilcUInt32 S6[256] = {
 378 0xf6fa8f9dUL, 0x2cac6ce1UL, 0x4ca34867UL, 0xe2337f7cUL, 0x95db08e7UL, 0x016843b4UL,
 379 0xeced5cbcUL, 0x325553acUL, 0xbf9f0960UL, 0xdfa1e2edUL, 0x83f0579dUL, 0x63ed86b9UL,
 380 0x1ab6a6b8UL, 0xde5ebe39UL, 0xf38ff732UL, 0x8989b138UL, 0x33f14961UL, 0xc01937bdUL,
 381 0xf506c6daUL, 0xe4625e7eUL, 0xa308ea99UL, 0x4e23e33cUL, 0x79cbd7ccUL, 0x48a14367UL,
 382 0xa3149619UL, 0xfec94bd5UL, 0xa114174aUL, 0xeaa01866UL, 0xa084db2dUL, 0x09a8486fUL,
 383 0xa888614aUL, 0x2900af98UL, 0x01665991UL, 0xe1992863UL, 0xc8f30c60UL, 0x2e78ef3cUL,
 384 0xd0d51932UL, 0xcf0fec14UL, 0xf7ca07d2UL, 0xd0a82072UL, 0xfd41197eUL, 0x9305a6b0UL,
 385 0xe86be3daUL, 0x74bed3cdUL, 0x372da53cUL, 0x4c7f4448UL, 0xdab5d440UL, 0x6dba0ec3UL,
 386 0x083919a7UL, 0x9fbaeed9UL, 0x49dbcfb0UL, 0x4e670c53UL, 0x5c3d9c01UL, 0x64bdb941UL,
 387 0x2c0e636aUL, 0xba7dd9cdUL, 0xea6f7388UL, 0xe70bc762UL, 0x35f29adbUL, 0x5c4cdd8dUL,
 388 0xf0d48d8cUL, 0xb88153e2UL, 0x08a19866UL, 0x1ae2eac8UL, 0x284caf89UL, 0xaa928223UL,
 389 0x9334be53UL, 0x3b3a21bfUL, 0x16434be3UL, 0x9aea3906UL, 0xefe8c36eUL, 0xf890cdd9UL,
 390 0x80226daeUL, 0xc340a4a3UL, 0xdf7e9c09UL, 0xa694a807UL, 0x5b7c5eccUL, 0x221db3a6UL,
 391 0x9a69a02fUL, 0x68818a54UL, 0xceb2296fUL, 0x53c0843aUL, 0xfe893655UL, 0x25bfe68aUL,
 392 0xb4628abcUL, 0xcf222ebfUL, 0x25ac6f48UL, 0xa9a99387UL, 0x53bddb65UL, 0xe76ffbe7UL,
 393 0xe967fd78UL, 0x0ba93563UL, 0x8e342bc1UL, 0xe8a11be9UL, 0x4980740dUL, 0xc8087dfcUL,
 394 0x8de4bf99UL, 0xa11101a0UL, 0x7fd37975UL, 0xda5a26c0UL, 0xe81f994fUL, 0x9528cd89UL,
 395 0xfd339fedUL, 0xb87834bfUL, 0x5f04456dUL, 0x22258698UL, 0xc9c4c83bUL, 0x2dc156beUL,
 396 0x4f628daaUL, 0x57f55ec5UL, 0xe2220abeUL, 0xd2916ebfUL, 0x4ec75b95UL, 0x24f2c3c0UL,
 397 0x42d15d99UL, 0xcd0d7fa0UL, 0x7b6e27ffUL, 0xa8dc8af0UL, 0x7345c106UL, 0xf41e232fUL,
 398 0x35162386UL, 0xe6ea8926UL, 0x3333b094UL, 0x157ec6f2UL, 0x372b74afUL, 0x692573e4UL,
 399 0xe9a9d848UL, 0xf3160289UL, 0x3a62ef1dUL, 0xa787e238UL, 0xf3a5f676UL, 0x74364853UL,
 400 0x20951063UL, 0x4576698dUL, 0xb6fad407UL, 0x592af950UL, 0x36f73523UL, 0x4cfb6e87UL,
 401 0x7da4cec0UL, 0x6c152daaUL, 0xcb0396a8UL, 0xc50dfe5dUL, 0xfcd707abUL, 0x0921c42fUL,
 402 0x89dff0bbUL, 0x5fe2be78UL, 0x448f4f33UL, 0x754613c9UL, 0x2b05d08dUL, 0x48b9d585UL,
 403 0xdc049441UL, 0xc8098f9bUL, 0x7dede786UL, 0xc39a3373UL, 0x42410005UL, 0x6a091751UL,
 404 0x0ef3c8a6UL, 0x890072d6UL, 0x28207682UL, 0xa9a9f7beUL, 0xbf32679dUL, 0xd45b5b75UL,
 405 0xb353fd00UL, 0xcbb0e358UL, 0x830f220aUL, 0x1f8fb214UL, 0xd372cf08UL, 0xcc3c4a13UL,
 406 0x8cf63166UL, 0x061c87beUL, 0x88c98f88UL, 0x6062e397UL, 0x47cf8e7aUL, 0xb6c85283UL,
 407 0x3cc2acfbUL, 0x3fc06976UL, 0x4e8f0252UL, 0x64d8314dUL, 0xda3870e3UL, 0x1e665459UL,
 408 0xc10908f0UL, 0x513021a5UL, 0x6c5b68b7UL, 0x822f8aa0UL, 0x3007cd3eUL, 0x74719eefUL,
 409 0xdc872681UL, 0x073340d4UL, 0x7e432fd9UL, 0x0c5ec241UL, 0x8809286cUL, 0xf592d891UL,
 410 0x08a930f6UL, 0x957ef305UL, 0xb7fbffbdUL, 0xc266e96fUL, 0x6fe4ac98UL, 0xb173ecc0UL,
 411 0xbc60b42aUL, 0x953498daUL, 0xfba1ae12UL, 0x2d4bd736UL, 0x0f25faabUL, 0xa4f3fcebUL,
 412 0xe2969123UL, 0x257f0c3dUL, 0x9348af49UL, 0x361400bcUL, 0xe8816f4aUL, 0x3814f200UL,
 413 0xa3f94043UL, 0x9c7a54c2UL, 0xbc704f57UL, 0xda41e7f9UL, 0xc25ad33aUL, 0x54f4a084UL,
 414 0xb17f5505UL, 0x59357cbeUL, 0xedbd15c8UL, 0x7f97c5abUL, 0xba5ac7b5UL, 0xb6f6deafUL,
 415 0x3a479c3aUL, 0x5302da25UL, 0x653d7e6aUL, 0x54268d49UL, 0x51a477eaUL, 0x5017d55bUL,
 416 0xd7d25d88UL, 0x44136c76UL, 0x0404a8c8UL, 0xb8e5a121UL, 0xb81a928aUL, 0x60ed5869UL,
 417 0x97c55b96UL, 0xeaec991bUL, 0x29935913UL, 0x01fdb7f1UL, 0x088e8dfaUL, 0x9ab6f6f5UL,
 418 0x3b4cbf9fUL, 0x4a5de3abUL, 0xe6051d35UL, 0xa0e1d855UL, 0xd36b4cf1UL, 0xf544edebUL,
 419 0xb0e93524UL, 0xbebb8fbdUL, 0xa2d762cfUL, 0x49c92f54UL, 0x38b5f331UL, 0x7128a454UL,
 420 0x48392905UL, 0xa65b1db8UL, 0x851c97bdUL, 0xd675cf2fUL};
 421
 422 static const SilcUInt32 S7[256] = {
 423 0x85e04019UL, 0x332bf567UL, 0x662dbfffUL, 0xcfc65693UL, 0x2a8d7f6fUL, 0xab9bc912UL,
 424 0xde6008a1UL, 0x2028da1fUL, 0x0227bce7UL, 0x4d642916UL, 0x18fac300UL, 0x50f18b82UL,
 425 0x2cb2cb11UL, 0xb232e75cUL, 0x4b3695f2UL, 0xb28707deUL, 0xa05fbcf6UL, 0xcd4181e9UL,
 426 0xe150210cUL, 0xe24ef1bdUL, 0xb168c381UL, 0xfde4e789UL, 0x5c79b0d8UL, 0x1e8bfd43UL,
 427 0x4d495001UL, 0x38be4341UL, 0x913cee1dUL, 0x92a79c3fUL, 0x089766beUL, 0xbaeeadf4UL,
 428 0x1286becfUL, 0xb6eacb19UL, 0x2660c200UL, 0x7565bde4UL, 0x64241f7aUL, 0x8248dca9UL,
 429 0xc3b3ad66UL, 0x28136086UL, 0x0bd8dfa8UL, 0x356d1cf2UL, 0x107789beUL, 0xb3b2e9ceUL,
 430 0x0502aa8fUL, 0x0bc0351eUL, 0x166bf52aUL, 0xeb12ff82UL, 0xe3486911UL, 0xd34d7516UL,
 431 0x4e7b3affUL, 0x5f43671bUL, 0x9cf6e037UL, 0x4981ac83UL, 0x334266ceUL, 0x8c9341b7UL,
 432 0xd0d854c0UL, 0xcb3a6c88UL, 0x47bc2829UL, 0x4725ba37UL, 0xa66ad22bUL, 0x7ad61f1eUL,
 433 0x0c5cbafaUL, 0x4437f107UL, 0xb6e79962UL, 0x42d2d816UL, 0x0a961288UL, 0xe1a5c06eUL,
 434 0x13749e67UL, 0x72fc081aUL, 0xb1d139f7UL, 0xf9583745UL, 0xcf19df58UL, 0xbec3f756UL,
 435 0xc06eba30UL, 0x07211b24UL, 0x45c28829UL, 0xc95e317fUL, 0xbc8ec511UL, 0x38bc46e9UL,
 436 0xc6e6fa14UL, 0xbae8584aUL, 0xad4ebc46UL, 0x468f508bUL, 0x7829435fUL, 0xf124183bUL,
 437 0x821dba9fUL, 0xaff60ff4UL, 0xea2c4e6dUL, 0x16e39264UL, 0x92544a8bUL, 0x009b4fc3UL,
 438 0xaba68cedUL, 0x9ac96f78UL, 0x06a5b79aUL, 0xb2856e6eUL, 0x1aec3ca9UL, 0xbe838688UL,
 439 0x0e0804e9UL, 0x55f1be56UL, 0xe7e5363bUL, 0xb3a1f25dUL, 0xf7debb85UL, 0x61fe033cUL,
 440 0x16746233UL, 0x3c034c28UL, 0xda6d0c74UL, 0x79aac56cUL, 0x3ce4e1adUL, 0x51f0c802UL,
 441 0x98f8f35aUL, 0x1626a49fUL, 0xeed82b29UL, 0x1d382fe3UL, 0x0c4fb99aUL, 0xbb325778UL,
 442 0x3ec6d97bUL, 0x6e77a6a9UL, 0xcb658b5cUL, 0xd45230c7UL, 0x2bd1408bUL, 0x60c03eb7UL,
 443 0xb9068d78UL, 0xa33754f4UL, 0xf430c87dUL, 0xc8a71302UL, 0xb96d8c32UL, 0xebd4e7beUL,
 444 0xbe8b9d2dUL, 0x7979fb06UL, 0xe7225308UL, 0x8b75cf77UL, 0x11ef8da4UL, 0xe083c858UL,
 445 0x8d6b786fUL, 0x5a6317a6UL, 0xfa5cf7a0UL, 0x5dda0033UL, 0xf28ebfb0UL, 0xf5b9c310UL,
 446 0xa0eac280UL, 0x08b9767aUL, 0xa3d9d2b0UL, 0x79d34217UL, 0x021a718dUL, 0x9ac6336aUL,
 447 0x2711fd60UL, 0x438050e3UL, 0x069908a8UL, 0x3d7fedc4UL, 0x826d2befUL, 0x4eeb8476UL,
 448 0x488dcf25UL, 0x36c9d566UL, 0x28e74e41UL, 0xc2610acaUL, 0x3d49a9cfUL, 0xbae3b9dfUL,
 449 0xb65f8de6UL, 0x92aeaf64UL, 0x3ac7d5e6UL, 0x9ea80509UL, 0xf22b017dUL, 0xa4173f70UL,
 450 0xdd1e16c3UL, 0x15e0d7f9UL, 0x50b1b887UL, 0x2b9f4fd5UL, 0x625aba82UL, 0x6a017962UL,
 451 0x2ec01b9cUL, 0x15488aa9UL, 0xd716e740UL, 0x40055a2cUL, 0x93d29a22UL, 0xe32dbf9aUL,
 452 0x058745b9UL, 0x3453dc1eUL, 0xd699296eUL, 0x496cff6fUL, 0x1c9f4986UL, 0xdfe2ed07UL,
 453 0xb87242d1UL, 0x19de7eaeUL, 0x053e561aUL, 0x15ad6f8cUL, 0x66626c1cUL, 0x7154c24cUL,
 454 0xea082b2aUL, 0x93eb2939UL, 0x17dcb0f0UL, 0x58d4f2aeUL, 0x9ea294fbUL, 0x52cf564cUL,
 455 0x9883fe66UL, 0x2ec40581UL, 0x763953c3UL, 0x01d6692eUL, 0xd3a0c108UL, 0xa1e7160eUL,
 456 0xe4f2dfa6UL, 0x693ed285UL, 0x74904698UL, 0x4c2b0eddUL, 0x4f757656UL, 0x5d393378UL,
 457 0xa132234fUL, 0x3d321c5dUL, 0xc3f5e194UL, 0x4b269301UL, 0xc79f022fUL, 0x3c997e7eUL,
 458 0x5e4f9504UL, 0x3ffafbbdUL, 0x76f7ad0eUL, 0x296693f4UL, 0x3d1fce6fUL, 0xc61e45beUL,
 459 0xd3b5ab34UL, 0xf72bf9b7UL, 0x1b0434c0UL, 0x4e72b567UL, 0x5592a33dUL, 0xb5229301UL,
 460 0xcfd2a87fUL, 0x60aeb767UL, 0x1814386bUL, 0x30bcc33dUL, 0x38a0c07dUL, 0xfd1606f2UL,
 461 0xc363519bUL, 0x589dd390UL, 0x5479f8e6UL, 0x1cb8d647UL, 0x97fd61a9UL, 0xea7759f4UL,
 462 0x2d57539dUL, 0x569a58cfUL, 0xe84e63adUL, 0x462e1b78UL, 0x6580f87eUL, 0xf3817914UL,
 463 0x91da55f4UL, 0x40a230f3UL, 0xd1988f35UL, 0xb6e318d2UL, 0x3ffa50bcUL, 0x3d40f021UL,
 464 0xc3c0bdaeUL, 0x4958c24cUL, 0x518f36b2UL, 0x84b1d370UL, 0x0fedce83UL, 0x878ddadaUL,
 465 0xf2a279c7UL, 0x94e01be8UL, 0x90716f4bUL, 0x954b8aa3UL};
 466
 467 static const SilcUInt32 S8[256] = {
 468 0xe216300dUL, 0xbbddfffcUL, 0xa7ebdabdUL, 0x35648095UL, 0x7789f8b7UL, 0xe6c1121bUL,
 469 0x0e241600UL, 0x052ce8b5UL, 0x11a9cfb0UL, 0xe5952f11UL, 0xece7990aUL, 0x9386d174UL,
 470 0x2a42931cUL, 0x76e38111UL, 0xb12def3aUL, 0x37ddddfcUL, 0xde9adeb1UL, 0x0a0cc32cUL,
 471 0xbe197029UL, 0x84a00940UL, 0xbb243a0fUL, 0xb4d137cfUL, 0xb44e79f0UL, 0x049eedfdUL,
 472 0x0b15a15dUL, 0x480d3168UL, 0x8bbbde5aUL, 0x669ded42UL, 0xc7ece831UL, 0x3f8f95e7UL,
 473 0x72df191bUL, 0x7580330dUL, 0x94074251UL, 0x5c7dcdfaUL, 0xabbe6d63UL, 0xaa402164UL,
 474 0xb301d40aUL, 0x02e7d1caUL, 0x53571daeUL, 0x7a3182a2UL, 0x12a8ddecUL, 0xfdaa335dUL,
 475 0x176f43e8UL, 0x71fb46d4UL, 0x38129022UL, 0xce949ad4UL, 0xb84769adUL, 0x965bd862UL,
 476 0x82f3d055UL, 0x66fb9767UL, 0x15b80b4eUL, 0x1d5b47a0UL, 0x4cfde06fUL, 0xc28ec4b8UL,
 477 0x57e8726eUL, 0x647a78fcUL, 0x99865d44UL, 0x608bd593UL, 0x6c200e03UL, 0x39dc5ff6UL,
 478 0x5d0b00a3UL, 0xae63aff2UL, 0x7e8bd632UL, 0x70108c0cUL, 0xbbd35049UL, 0x2998df04UL,
 479 0x980cf42aUL, 0x9b6df491UL, 0x9e7edd53UL, 0x06918548UL, 0x58cb7e07UL, 0x3b74ef2eUL,
 480 0x522fffb1UL, 0xd24708ccUL, 0x1c7e27cdUL, 0xa4eb215bUL, 0x3cf1d2e2UL, 0x19b47a38UL,
 481 0x424f7618UL, 0x35856039UL, 0x9d17dee7UL, 0x27eb35e6UL, 0xc9aff67bUL, 0x36baf5b8UL,
 482 0x09c467cdUL, 0xc18910b1UL, 0xe11dbf7bUL, 0x06cd1af8UL, 0x7170c608UL, 0x2d5e3354UL,
 483 0xd4de495aUL, 0x64c6d006UL, 0xbcc0c62cUL, 0x3dd00db3UL, 0x708f8f34UL, 0x77d51b42UL,
 484 0x264f620fUL, 0x24b8d2bfUL, 0x15c1b79eUL, 0x46a52564UL, 0xf8d7e54eUL, 0x3e378160UL,
 485 0x7895cda5UL, 0x859c15a5UL, 0xe6459788UL, 0xc37bc75fUL, 0xdb07ba0cUL, 0x0676a3abUL,
 486 0x7f229b1eUL, 0x31842e7bUL, 0x24259fd7UL, 0xf8bef472UL, 0x835ffcb8UL, 0x6df4c1f2UL,
 487 0x96f5b195UL, 0xfd0af0fcUL, 0xb0fe134cUL, 0xe2506d3dUL, 0x4f9b12eaUL, 0xf215f225UL,
 488 0xa223736fUL, 0x9fb4c428UL, 0x25d04979UL, 0x34c713f8UL, 0xc4618187UL, 0xea7a6e98UL,
 489 0x7cd16efcUL, 0x1436876cUL, 0xf1544107UL, 0xbedeee14UL, 0x56e9af27UL, 0xa04aa441UL,
 490 0x3cf7c899UL, 0x92ecbae6UL, 0xdd67016dUL, 0x151682ebUL, 0xa842eedfUL, 0xfdba60b4UL,
 491 0xf1907b75UL, 0x20e3030fUL, 0x24d8c29eUL, 0xe139673bUL, 0xefa63fb8UL, 0x71873054UL,
 492 0xb6f2cf3bUL, 0x9f326442UL, 0xcb15a4ccUL, 0xb01a4504UL, 0xf1e47d8dUL, 0x844a1be5UL,
 493 0xbae7dfdcUL, 0x42cbda70UL, 0xcd7dae0aUL, 0x57e85b7aUL, 0xd53f5af6UL, 0x20cf4d8cUL,
 494 0xcea4d428UL, 0x79d130a4UL, 0x3486ebfbUL, 0x33d3cddcUL, 0x77853b53UL, 0x37effcb5UL,
 495 0xc5068778UL, 0xe580b3e6UL, 0x4e68b8f4UL, 0xc5c8b37eUL, 0x0d809ea2UL, 0x398feb7cUL,
 496 0x132a4f94UL, 0x43b7950eUL, 0x2fee7d1cUL, 0x223613bdUL, 0xdd06caa2UL, 0x37df932bUL,
 497 0xc4248289UL, 0xacf3ebc3UL, 0x5715f6b7UL, 0xef3478ddUL, 0xf267616fUL, 0xc148cbe4UL,
 498 0x9052815eUL, 0x5e410fabUL, 0xb48a2465UL, 0x2eda7fa4UL, 0xe87b40e4UL, 0xe98ea084UL,
 499 0x5889e9e1UL, 0xefd390fcUL, 0xdd07d35bUL, 0xdb485694UL, 0x38d7e5b2UL, 0x57720101UL,
 500 0x730edebcUL, 0x5b643113UL, 0x94917e4fUL, 0x503c2fbaUL, 0x646f1282UL, 0x7523d24aUL,
 501 0xe0779695UL, 0xf9c17a8fUL, 0x7a5b2121UL, 0xd187b896UL, 0x29263a4dUL, 0xba510cdfUL,
 502 0x81f47c9fUL, 0xad1163edUL, 0xea7b5965UL, 0x1a00726eUL, 0x11403092UL, 0x00da6d77UL,
 503 0x4a0cdd61UL, 0xad1f4603UL, 0x605bdfb0UL, 0x9eedc364UL, 0x22ebe6a8UL, 0xcee7d28aUL,
 504 0xa0e736a0UL, 0x5564a6b9UL, 0x10853209UL, 0xc7eb8f37UL, 0x2de705caUL, 0x8951570fUL,
 505 0xdf09822bUL, 0xbd691a6cUL, 0xaa12e4f2UL, 0x87451c0fUL, 0xe0f6a27aUL, 0x3ada4819UL,
 506 0x4cf1764fUL, 0x0d771c2bUL, 0x67cdb156UL, 0x350d8384UL, 0x5938fa0fUL, 0x42399ef3UL,
 507 0x36997b07UL, 0x0e84093dUL, 0x4aa93e61UL, 0x8360d87bUL, 0x1fa98b0cUL, 0x1149382cUL,
 508 0xe97625a5UL, 0x0614d1b7UL, 0x0e25244bUL, 0x0c768347UL, 0x589e8d82UL, 0x0d2059d1UL,
 509 0xa466bb1eUL, 0xf8da0a82UL, 0x04f19130UL, 0xba6e4ec0UL, 0x99265164UL, 0x1ee7230dUL,
 510 0x50b2ad80UL, 0xeaee6801UL, 0x8db2a283UL, 0xea8bf59eUL};
 511
 512 /* returns the i'th byte of a variable */
 513 #ifdef _MSC_VER
 514    #define GB(x, i) ((unsigned char)((x[(15-i)>>2])>>(unsigned)(8*((15-i)&3))))
 515 #else
 516    #define GB(x, i) (((x[(15-i)>>2])>>(unsigned)(8*((15-i)&3)))&255)
 517 #endif
 518
 519 int cast5_setup(const unsigned char *key, int keylen, int num_rounds,
 520                 cast5_key *skey)
 521 {
 522    SilcUInt32 x[4], z[4];
 523    int y, i;
 524
 525    if (num_rounds != 12 && num_rounds != 16 && num_rounds != 0)
 526      return FALSE;
 527
 528    if (num_rounds == 12 && (keylen / 8) > 10)
 529      return FALSE;
 530
 531    if ((keylen / 8) < 5)
 532      return FALSE;
 533
 534    if ((keylen / 8) > 16)
 535      keylen = 128;
 536
 537    /* load and start the awful looking network */
 538    for (y = 0; y < (keylen / 8) / 4; y++)
 539      SILC_GET32_MSB(x[3-y],key+4*y);
 540
 541    for (i = y = 0; y < 2; y++) {
 542         z[3] = x[3] ^ S5[GB(x, 0xD)] ^ S6[GB(x, 0xF)] ^ S7[GB(x, 0xC)] ^ S8[GB(x, 0xE)] ^ S7[GB(x, 0x8)];
 543         z[2] = x[1] ^ S5[GB(z, 0x0)] ^ S6[GB(z, 0x2)] ^ S7[GB(z, 0x1)] ^ S8[GB(z, 0x3)] ^ S8[GB(x, 0xA)];
 544         z[1] = x[0] ^ S5[GB(z, 0x7)] ^ S6[GB(z, 0x6)] ^ S7[GB(z, 0x5)] ^ S8[GB(z, 0x4)] ^ S5[GB(x, 0x9)];
 545         z[0] = x[2] ^ S5[GB(z, 0xA)] ^ S6[GB(z, 0x9)] ^ S7[GB(z, 0xb)] ^ S8[GB(z, 0x8)] ^ S6[GB(x, 0xB)];
 546         skey->K[i++] = S5[GB(z, 0x8)] ^ S6[GB(z, 0x9)] ^ S7[GB(z, 0x7)] ^ S8[GB(z, 0x6)] ^ S5[GB(z, 0x2)];
 547         skey->K[i++] = S5[GB(z, 0xA)] ^ S6[GB(z, 0xB)] ^ S7[GB(z, 0x5)] ^ S8[GB(z, 0x4)] ^ S6[GB(z, 0x6)];
 548         skey->K[i++] = S5[GB(z, 0xC)] ^ S6[GB(z, 0xd)] ^ S7[GB(z, 0x3)] ^ S8[GB(z, 0x2)] ^ S7[GB(z, 0x9)];
 549         skey->K[i++] = S5[GB(z, 0xE)] ^ S6[GB(z, 0xF)] ^ S7[GB(z, 0x1)] ^ S8[GB(z, 0x0)] ^ S8[GB(z, 0xc)];
 550
 551         x[3] = z[1] ^ S5[GB(z, 0x5)] ^ S6[GB(z, 0x7)] ^ S7[GB(z, 0x4)] ^ S8[GB(z, 0x6)] ^ S7[GB(z, 0x0)];
 552         x[2] = z[3] ^ S5[GB(x, 0x0)] ^ S6[GB(x, 0x2)] ^ S7[GB(x, 0x1)] ^ S8[GB(x, 0x3)] ^ S8[GB(z, 0x2)];
 553         x[1] = z[2] ^ S5[GB(x, 0x7)] ^ S6[GB(x, 0x6)] ^ S7[GB(x, 0x5)] ^ S8[GB(x, 0x4)] ^ S5[GB(z, 0x1)];
 554         x[0] = z[0] ^ S5[GB(x, 0xA)] ^ S6[GB(x, 0x9)] ^ S7[GB(x, 0xb)] ^ S8[GB(x, 0x8)] ^ S6[GB(z, 0x3)];
 555         skey->K[i++] = S5[GB(x, 0x3)] ^ S6[GB(x, 0x2)] ^ S7[GB(x, 0xc)] ^ S8[GB(x, 0xd)] ^ S5[GB(x, 0x8)];
 556         skey->K[i++] = S5[GB(x, 0x1)] ^ S6[GB(x, 0x0)] ^ S7[GB(x, 0xe)] ^ S8[GB(x, 0xf)] ^ S6[GB(x, 0xd)];
 557         skey->K[i++] = S5[GB(x, 0x7)] ^ S6[GB(x, 0x6)] ^ S7[GB(x, 0x8)] ^ S8[GB(x, 0x9)] ^ S7[GB(x, 0x3)];
 558         skey->K[i++] = S5[GB(x, 0x5)] ^ S6[GB(x, 0x4)] ^ S7[GB(x, 0xa)] ^ S8[GB(x, 0xb)] ^ S8[GB(x, 0x7)];
 559
 560         /* second half */
 561         z[3] = x[3] ^ S5[GB(x, 0xD)] ^ S6[GB(x, 0xF)] ^ S7[GB(x, 0xC)] ^ S8[GB(x, 0xE)] ^ S7[GB(x, 0x8)];
 562         z[2] = x[1] ^ S5[GB(z, 0x0)] ^ S6[GB(z, 0x2)] ^ S7[GB(z, 0x1)] ^ S8[GB(z, 0x3)] ^ S8[GB(x, 0xA)];
 563         z[1] = x[0] ^ S5[GB(z, 0x7)] ^ S6[GB(z, 0x6)] ^ S7[GB(z, 0x5)] ^ S8[GB(z, 0x4)] ^ S5[GB(x, 0x9)];
 564         z[0] = x[2] ^ S5[GB(z, 0xA)] ^ S6[GB(z, 0x9)] ^ S7[GB(z, 0xb)] ^ S8[GB(z, 0x8)] ^ S6[GB(x, 0xB)];
 565         skey->K[i++] = S5[GB(z, 0x3)] ^ S6[GB(z, 0x2)] ^ S7[GB(z, 0xc)] ^ S8[GB(z, 0xd)] ^ S5[GB(z, 0x9)];
 566         skey->K[i++] = S5[GB(z, 0x1)] ^ S6[GB(z, 0x0)] ^ S7[GB(z, 0xe)] ^ S8[GB(z, 0xf)] ^ S6[GB(z, 0xc)];
 567         skey->K[i++] = S5[GB(z, 0x7)] ^ S6[GB(z, 0x6)] ^ S7[GB(z, 0x8)] ^ S8[GB(z, 0x9)] ^ S7[GB(z, 0x2)];
 568         skey->K[i++] = S5[GB(z, 0x5)] ^ S6[GB(z, 0x4)] ^ S7[GB(z, 0xa)] ^ S8[GB(z, 0xb)] ^ S8[GB(z, 0x6)];
 569
 570         x[3] = z[1] ^ S5[GB(z, 0x5)] ^ S6[GB(z, 0x7)] ^ S7[GB(z, 0x4)] ^ S8[GB(z, 0x6)] ^ S7[GB(z, 0x0)];
 571         x[2] = z[3] ^ S5[GB(x, 0x0)] ^ S6[GB(x, 0x2)] ^ S7[GB(x, 0x1)] ^ S8[GB(x, 0x3)] ^ S8[GB(z, 0x2)];
 572         x[1] = z[2] ^ S5[GB(x, 0x7)] ^ S6[GB(x, 0x6)] ^ S7[GB(x, 0x5)] ^ S8[GB(x, 0x4)] ^ S5[GB(z, 0x1)];
 573         x[0] = z[0] ^ S5[GB(x, 0xA)] ^ S6[GB(x, 0x9)] ^ S7[GB(x, 0xb)] ^ S8[GB(x, 0x8)] ^ S6[GB(z, 0x3)];
 574         skey->K[i++] = S5[GB(x, 0x8)] ^ S6[GB(x, 0x9)] ^ S7[GB(x, 0x7)] ^ S8[GB(x, 0x6)] ^ S5[GB(x, 0x3)];
 575         skey->K[i++] = S5[GB(x, 0xa)] ^ S6[GB(x, 0xb)] ^ S7[GB(x, 0x5)] ^ S8[GB(x, 0x4)] ^ S6[GB(x, 0x7)];
 576         skey->K[i++] = S5[GB(x, 0xc)] ^ S6[GB(x, 0xd)] ^ S7[GB(x, 0x3)] ^ S8[GB(x, 0x2)] ^ S7[GB(x, 0x8)];
 577         skey->K[i++] = S5[GB(x, 0xe)] ^ S6[GB(x, 0xf)] ^ S7[GB(x, 0x1)] ^ S8[GB(x, 0x0)] ^ S8[GB(x, 0xd)];
 578    }
 579
 580    skey->keylen = keylen / 8;
 581
 582    return TRUE;
 583 }
 584
 585 #define __ROL(x, y) silc_rol(x, y)
 586
 587 static inline SilcUInt32 FI(SilcUInt32 R, SilcUInt32 Km, SilcUInt32 Kr)
 588 {
 589    SilcUInt32 I;
 590    I = (Km + R);
 591    I = __ROL(I, Kr);
 592    return ((S1[byte(I, 3)] ^ S2[byte(I,2)]) - S3[byte(I,1)]) + S4[byte(I,0)];
 593 }
 594
 595 static inline SilcUInt32 FII(SilcUInt32 R, SilcUInt32 Km, SilcUInt32 Kr)
 596 {
 597    SilcUInt32 I;
 598    I = (Km ^ R);
 599    I = __ROL(I, Kr);
 600    return ((S1[byte(I, 3)] - S2[byte(I,2)]) + S3[byte(I,1)]) ^ S4[byte(I,0)];
 601 }
 602
 603 static inline SilcUInt32 FIII(SilcUInt32 R, SilcUInt32 Km, SilcUInt32 Kr)
 604 {
 605    SilcUInt32 I;
 606    I = (Km - R);
 607    I = __ROL(I, Kr);
 608    return ((S1[byte(I, 3)] + S2[byte(I,2)]) ^ S3[byte(I,1)]) - S4[byte(I,0)];
 609 }
 610
 611 int cast5_encrypt(cast5_key *skey, const SilcUInt32 pt[2],
 612                   SilcUInt32 ct[2])
 613 {
 614    SilcUInt32 R, L;
 615
 616    L = pt[0];
 617    R = pt[1];
 618
 619    L ^= FI(R, skey->K[0], skey->K[16]);
 620    R ^= FII(L, skey->K[1], skey->K[17]);
 621    L ^= FIII(R, skey->K[2], skey->K[18]);
 622    R ^= FI(L, skey->K[3], skey->K[19]);
 623    L ^= FII(R, skey->K[4], skey->K[20]);
 624    R ^= FIII(L, skey->K[5], skey->K[21]);
 625    L ^= FI(R, skey->K[6], skey->K[22]);
 626    R ^= FII(L, skey->K[7], skey->K[23]);
 627    L ^= FIII(R, skey->K[8], skey->K[24]);
 628    R ^= FI(L, skey->K[9], skey->K[25]);
 629    L ^= FII(R, skey->K[10], skey->K[26]);
 630    R ^= FIII(L, skey->K[11], skey->K[27]);
 631    if (skey->keylen > 10) {
 632       L ^= FI(R, skey->K[12], skey->K[28]);
 633       R ^= FII(L, skey->K[13], skey->K[29]);
 634       L ^= FIII(R, skey->K[14], skey->K[30]);
 635       R ^= FI(L, skey->K[15], skey->K[31]);
 636    }
 637
 638    ct[0] = R;
 639    ct[1] = L;
 640
 641    return TRUE;
 642 }
 643
 644 int cast5_decrypt(cast5_key *skey, const SilcUInt32 ct[2],
 645                   SilcUInt32 pt[2])
 646 {
 647    SilcUInt32 R, L;
 648
 649    R = ct[0];
 650    L = ct[1];
 651
 652    if (skey->keylen > 10) {
 653       R ^= FI(L, skey->K[15], skey->K[31]);
 654       L ^= FIII(R, skey->K[14], skey->K[30]);
 655       R ^= FII(L, skey->K[13], skey->K[29]);
 656       L ^= FI(R, skey->K[12], skey->K[28]);
 657    }
 658    R ^= FIII(L, skey->K[11], skey->K[27]);
 659    L ^= FII(R, skey->K[10], skey->K[26]);
 660    R ^= FI(L, skey->K[9], skey->K[25]);
 661    L ^= FIII(R, skey->K[8], skey->K[24]);
 662    R ^= FII(L, skey->K[7], skey->K[23]);
 663    L ^= FI(R, skey->K[6], skey->K[22]);
 664    R ^= FIII(L, skey->K[5], skey->K[21]);
 665    L ^= FII(R, skey->K[4], skey->K[20]);
 666    R ^= FI(L, skey->K[3], skey->K[19]);
 667    L ^= FIII(R, skey->K[2], skey->K[18]);
 668    R ^= FII(L, skey->K[1], skey->K[17]);
 669    L ^= FI(R, skey->K[0], skey->K[16]);
 670
 671    pt[0] = L;
 672    pt[1] = R;
 673
 674    return TRUE;
 675 }