The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/crypto/cast6_generic.c

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    1 /* Kernel cryptographic api.
    2  * cast6.c - Cast6 cipher algorithm [rfc2612].
    3  *
    4  * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)
    5  * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption
    6  * algorithm.
    7  *
    8  * Copyright (C) 2003 Kartikey Mahendra Bhatt <kartik_me@hotmail.com>.
    9  *
   10  * This program is free software; you can redistribute it and/or modify it
   11  * under the terms of GNU General Public License as published by the Free
   12  * Software Foundation; either version 2 of the License, or (at your option)
   13  * any later version.
   14  *
   15  * You should have received a copy of the GNU General Public License
   16  * along with this program; if not, write to the Free Software
   17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
   18  */
   19 
   20 
   21 #include <asm/byteorder.h>
   22 #include <linux/init.h>
   23 #include <linux/crypto.h>
   24 #include <linux/module.h>
   25 #include <linux/errno.h>
   26 #include <linux/string.h>
   27 #include <linux/types.h>
   28 #include <crypto/cast6.h>
   29 
   30 #define s1 cast_s1
   31 #define s2 cast_s2
   32 #define s3 cast_s3
   33 #define s4 cast_s4
   34 
   35 #define F1(D, r, m)  ((I = ((m) + (D))), (I = rol32(I, (r))),   \
   36         (((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff]))
   37 #define F2(D, r, m)  ((I = ((m) ^ (D))), (I = rol32(I, (r))),   \
   38         (((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff]))
   39 #define F3(D, r, m)  ((I = ((m) - (D))), (I = rol32(I, (r))),   \
   40         (((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff]))
   41 
   42 static const u32 Tm[24][8] = {
   43         { 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d,
   44                 0x84c413be, 0xf39dff5f, 0x6277eb00 } ,
   45         { 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525,
   46                 0xfb9370c6, 0x6a6d5c67, 0xd9474808 } ,
   47         { 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d,
   48                 0x7262cdce, 0xe13cb96f, 0x5016a510 } ,
   49         { 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35,
   50                 0xe9322ad6, 0x580c1677, 0xc6e60218 } ,
   51         { 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d,
   52                 0x600187de, 0xcedb737f, 0x3db55f20 } ,
   53         { 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945,
   54                 0xd6d0e4e6, 0x45aad087, 0xb484bc28 } ,
   55         { 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d,
   56                 0x4da041ee, 0xbc7a2d8f, 0x2b541930 } ,
   57         { 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355,
   58                 0xc46f9ef6, 0x33498a97, 0xa2237638 } ,
   59         { 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d,
   60                 0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } ,
   61         { 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65,
   62                 0xb20e5906, 0x20e844a7, 0x8fc23048 } ,
   63         { 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d,
   64                 0x28ddb60e, 0x97b7a1af, 0x06918d50 } ,
   65         { 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775,
   66                 0x9fad1316, 0x0e86feb7, 0x7d60ea58 } ,
   67         { 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d,
   68                 0x167c701e, 0x85565bbf, 0xf4304760 } ,
   69         { 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185,
   70                 0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } ,
   71         { 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d,
   72                 0x041b2a2e, 0x72f515cf, 0xe1cf0170 } ,
   73         { 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95,
   74                 0x7aea8736, 0xe9c472d7, 0x589e5e78 } ,
   75         { 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d,
   76                 0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } ,
   77         { 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5,
   78                 0x68894146, 0xd7632ce7, 0x463d1888 } ,
   79         { 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad,
   80                 0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } ,
   81         { 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5,
   82                 0x5627fb56, 0xc501e6f7, 0x33dbd298 } ,
   83         { 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd,
   84                 0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } ,
   85         { 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5,
   86                 0x43c6b566, 0xb2a0a107, 0x217a8ca8 } ,
   87         { 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd,
   88                 0xba96126e, 0x296ffe0f, 0x9849e9b0 } ,
   89         { 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5,
   90                 0x31656f76, 0xa03f5b17, 0x0f1946b8 }
   91 };
   92 
   93 static const u8 Tr[4][8] = {
   94         { 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } ,
   95         { 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } ,
   96         { 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } ,
   97         { 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 }
   98 };
   99 
  100 /* forward octave */
  101 static inline void W(u32 *key, unsigned int i)
  102 {
  103         u32 I;
  104         key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]);
  105         key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]);
  106         key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]);
  107         key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]);
  108         key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]);
  109         key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]);
  110         key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]);
  111         key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]);
  112 }
  113 
  114 int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key,
  115                    unsigned key_len, u32 *flags)
  116 {
  117         int i;
  118         u32 key[8];
  119         __be32 p_key[8]; /* padded key */
  120 
  121         if (key_len % 4 != 0) {
  122                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
  123                 return -EINVAL;
  124         }
  125 
  126         memset(p_key, 0, 32);
  127         memcpy(p_key, in_key, key_len);
  128 
  129         key[0] = be32_to_cpu(p_key[0]);         /* A */
  130         key[1] = be32_to_cpu(p_key[1]);         /* B */
  131         key[2] = be32_to_cpu(p_key[2]);         /* C */
  132         key[3] = be32_to_cpu(p_key[3]);         /* D */
  133         key[4] = be32_to_cpu(p_key[4]);         /* E */
  134         key[5] = be32_to_cpu(p_key[5]);         /* F */
  135         key[6] = be32_to_cpu(p_key[6]);         /* G */
  136         key[7] = be32_to_cpu(p_key[7]);         /* H */
  137 
  138         for (i = 0; i < 12; i++) {
  139                 W(key, 2 * i);
  140                 W(key, 2 * i + 1);
  141 
  142                 c->Kr[i][0] = key[0] & 0x1f;
  143                 c->Kr[i][1] = key[2] & 0x1f;
  144                 c->Kr[i][2] = key[4] & 0x1f;
  145                 c->Kr[i][3] = key[6] & 0x1f;
  146 
  147                 c->Km[i][0] = key[7];
  148                 c->Km[i][1] = key[5];
  149                 c->Km[i][2] = key[3];
  150                 c->Km[i][3] = key[1];
  151         }
  152 
  153         return 0;
  154 }
  155 EXPORT_SYMBOL_GPL(__cast6_setkey);
  156 
  157 int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
  158 {
  159         return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen,
  160                               &tfm->crt_flags);
  161 }
  162 EXPORT_SYMBOL_GPL(cast6_setkey);
  163 
  164 /*forward quad round*/
  165 static inline void Q(u32 *block, u8 *Kr, u32 *Km)
  166 {
  167         u32 I;
  168         block[2] ^= F1(block[3], Kr[0], Km[0]);
  169         block[1] ^= F2(block[2], Kr[1], Km[1]);
  170         block[0] ^= F3(block[1], Kr[2], Km[2]);
  171         block[3] ^= F1(block[0], Kr[3], Km[3]);
  172 }
  173 
  174 /*reverse quad round*/
  175 static inline void QBAR(u32 *block, u8 *Kr, u32 *Km)
  176 {
  177         u32 I;
  178         block[3] ^= F1(block[0], Kr[3], Km[3]);
  179         block[0] ^= F3(block[1], Kr[2], Km[2]);
  180         block[1] ^= F2(block[2], Kr[1], Km[1]);
  181         block[2] ^= F1(block[3], Kr[0], Km[0]);
  182 }
  183 
  184 void __cast6_encrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf)
  185 {
  186         const __be32 *src = (const __be32 *)inbuf;
  187         __be32 *dst = (__be32 *)outbuf;
  188         u32 block[4];
  189         u32 *Km;
  190         u8 *Kr;
  191 
  192         block[0] = be32_to_cpu(src[0]);
  193         block[1] = be32_to_cpu(src[1]);
  194         block[2] = be32_to_cpu(src[2]);
  195         block[3] = be32_to_cpu(src[3]);
  196 
  197         Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km);
  198         Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km);
  199         Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km);
  200         Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km);
  201         Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km);
  202         Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km);
  203         Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km);
  204         Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km);
  205         Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km);
  206         Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km);
  207         Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km);
  208         Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km);
  209 
  210         dst[0] = cpu_to_be32(block[0]);
  211         dst[1] = cpu_to_be32(block[1]);
  212         dst[2] = cpu_to_be32(block[2]);
  213         dst[3] = cpu_to_be32(block[3]);
  214 }
  215 EXPORT_SYMBOL_GPL(__cast6_encrypt);
  216 
  217 static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
  218 {
  219         __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
  220 }
  221 
  222 void __cast6_decrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf)
  223 {
  224         const __be32 *src = (const __be32 *)inbuf;
  225         __be32 *dst = (__be32 *)outbuf;
  226         u32 block[4];
  227         u32 *Km;
  228         u8 *Kr;
  229 
  230         block[0] = be32_to_cpu(src[0]);
  231         block[1] = be32_to_cpu(src[1]);
  232         block[2] = be32_to_cpu(src[2]);
  233         block[3] = be32_to_cpu(src[3]);
  234 
  235         Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km);
  236         Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km);
  237         Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km);
  238         Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km);
  239         Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km);
  240         Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km);
  241         Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km);
  242         Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km);
  243         Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km);
  244         Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km);
  245         Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km);
  246         Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km);
  247 
  248         dst[0] = cpu_to_be32(block[0]);
  249         dst[1] = cpu_to_be32(block[1]);
  250         dst[2] = cpu_to_be32(block[2]);
  251         dst[3] = cpu_to_be32(block[3]);
  252 }
  253 EXPORT_SYMBOL_GPL(__cast6_decrypt);
  254 
  255 static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
  256 {
  257         __cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
  258 }
  259 
  260 static struct crypto_alg alg = {
  261         .cra_name = "cast6",
  262         .cra_driver_name = "cast6-generic",
  263         .cra_priority = 100,
  264         .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
  265         .cra_blocksize = CAST6_BLOCK_SIZE,
  266         .cra_ctxsize = sizeof(struct cast6_ctx),
  267         .cra_alignmask = 3,
  268         .cra_module = THIS_MODULE,
  269         .cra_u = {
  270                   .cipher = {
  271                              .cia_min_keysize = CAST6_MIN_KEY_SIZE,
  272                              .cia_max_keysize = CAST6_MAX_KEY_SIZE,
  273                              .cia_setkey = cast6_setkey,
  274                              .cia_encrypt = cast6_encrypt,
  275                              .cia_decrypt = cast6_decrypt}
  276                   }
  277 };
  278 
  279 static int __init cast6_mod_init(void)
  280 {
  281         return crypto_register_alg(&alg);
  282 }
  283 
  284 static void __exit cast6_mod_fini(void)
  285 {
  286         crypto_unregister_alg(&alg);
  287 }
  288 
  289 module_init(cast6_mod_init);
  290 module_exit(cast6_mod_fini);
  291 
  292 MODULE_LICENSE("GPL");
  293 MODULE_DESCRIPTION("Cast6 Cipher Algorithm");
  294 MODULE_ALIAS("cast6");

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