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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 | // SPDX-License-Identifier: GPL-2.0-or-later /* Kernel cryptographic api. * cast6.c - Cast6 cipher algorithm [rfc2612]. * * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN) * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption * algorithm. * * Copyright (C) 2003 Kartikey Mahendra Bhatt <kartik_me@hotmail.com>. */ #include <asm/byteorder.h> #include <linux/init.h> #include <linux/crypto.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <crypto/cast6.h> #define s1 cast_s1 #define s2 cast_s2 #define s3 cast_s3 #define s4 cast_s4 #define F1(D, r, m) ((I = ((m) + (D))), (I = rol32(I, (r))), \ (((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff])) #define F2(D, r, m) ((I = ((m) ^ (D))), (I = rol32(I, (r))), \ (((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff])) #define F3(D, r, m) ((I = ((m) - (D))), (I = rol32(I, (r))), \ (((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff])) static const u32 Tm[24][8] = { { 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d, 0x84c413be, 0xf39dff5f, 0x6277eb00 } , { 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525, 0xfb9370c6, 0x6a6d5c67, 0xd9474808 } , { 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d, 0x7262cdce, 0xe13cb96f, 0x5016a510 } , { 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35, 0xe9322ad6, 0x580c1677, 0xc6e60218 } , { 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d, 0x600187de, 0xcedb737f, 0x3db55f20 } , { 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945, 0xd6d0e4e6, 0x45aad087, 0xb484bc28 } , { 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d, 0x4da041ee, 0xbc7a2d8f, 0x2b541930 } , { 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355, 0xc46f9ef6, 0x33498a97, 0xa2237638 } , { 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d, 0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } , { 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65, 0xb20e5906, 0x20e844a7, 0x8fc23048 } , { 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d, 0x28ddb60e, 0x97b7a1af, 0x06918d50 } , { 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775, 0x9fad1316, 0x0e86feb7, 0x7d60ea58 } , { 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d, 0x167c701e, 0x85565bbf, 0xf4304760 } , { 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185, 0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } , { 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d, 0x041b2a2e, 0x72f515cf, 0xe1cf0170 } , { 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95, 0x7aea8736, 0xe9c472d7, 0x589e5e78 } , { 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d, 0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } , { 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5, 0x68894146, 0xd7632ce7, 0x463d1888 } , { 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad, 0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } , { 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5, 0x5627fb56, 0xc501e6f7, 0x33dbd298 } , { 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd, 0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } , { 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5, 0x43c6b566, 0xb2a0a107, 0x217a8ca8 } , { 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd, 0xba96126e, 0x296ffe0f, 0x9849e9b0 } , { 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5, 0x31656f76, 0xa03f5b17, 0x0f1946b8 } }; static const u8 Tr[4][8] = { { 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } , { 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } , { 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } , { 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 } }; /* forward octave */ static inline void W(u32 *key, unsigned int i) { u32 I; key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]); key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]); key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]); key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]); key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]); key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]); key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]); key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]); } int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key, unsigned int key_len) { int i; u32 key[8]; __be32 p_key[8]; /* padded key */ if (key_len % 4 != 0) return -EINVAL; memset(p_key, 0, 32); memcpy(p_key, in_key, key_len); key[0] = be32_to_cpu(p_key[0]); /* A */ key[1] = be32_to_cpu(p_key[1]); /* B */ key[2] = be32_to_cpu(p_key[2]); /* C */ key[3] = be32_to_cpu(p_key[3]); /* D */ key[4] = be32_to_cpu(p_key[4]); /* E */ key[5] = be32_to_cpu(p_key[5]); /* F */ key[6] = be32_to_cpu(p_key[6]); /* G */ key[7] = be32_to_cpu(p_key[7]); /* H */ for (i = 0; i < 12; i++) { W(key, 2 * i); W(key, 2 * i + 1); c->Kr[i][0] = key[0] & 0x1f; c->Kr[i][1] = key[2] & 0x1f; c->Kr[i][2] = key[4] & 0x1f; c->Kr[i][3] = key[6] & 0x1f; c->Km[i][0] = key[7]; c->Km[i][1] = key[5]; c->Km[i][2] = key[3]; c->Km[i][3] = key[1]; } return 0; } EXPORT_SYMBOL_GPL(__cast6_setkey); int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen); } EXPORT_SYMBOL_GPL(cast6_setkey); /*forward quad round*/ static inline void Q(u32 *block, const u8 *Kr, const u32 *Km) { u32 I; block[2] ^= F1(block[3], Kr[0], Km[0]); block[1] ^= F2(block[2], Kr[1], Km[1]); block[0] ^= F3(block[1], Kr[2], Km[2]); block[3] ^= F1(block[0], Kr[3], Km[3]); } /*reverse quad round*/ static inline void QBAR(u32 *block, const u8 *Kr, const u32 *Km) { u32 I; block[3] ^= F1(block[0], Kr[3], Km[3]); block[0] ^= F3(block[1], Kr[2], Km[2]); block[1] ^= F2(block[2], Kr[1], Km[1]); block[2] ^= F1(block[3], Kr[0], Km[0]); } void __cast6_encrypt(const void *ctx, u8 *outbuf, const u8 *inbuf) { const struct cast6_ctx *c = ctx; const __be32 *src = (const __be32 *)inbuf; __be32 *dst = (__be32 *)outbuf; u32 block[4]; const u32 *Km; const u8 *Kr; block[0] = be32_to_cpu(src[0]); block[1] = be32_to_cpu(src[1]); block[2] = be32_to_cpu(src[2]); block[3] = be32_to_cpu(src[3]); Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km); Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km); Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km); Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km); Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km); Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km); Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km); Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km); Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km); Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km); Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km); Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km); dst[0] = cpu_to_be32(block[0]); dst[1] = cpu_to_be32(block[1]); dst[2] = cpu_to_be32(block[2]); dst[3] = cpu_to_be32(block[3]); } EXPORT_SYMBOL_GPL(__cast6_encrypt); static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) { __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); } void __cast6_decrypt(const void *ctx, u8 *outbuf, const u8 *inbuf) { const struct cast6_ctx *c = ctx; const __be32 *src = (const __be32 *)inbuf; __be32 *dst = (__be32 *)outbuf; u32 block[4]; const u32 *Km; const u8 *Kr; block[0] = be32_to_cpu(src[0]); block[1] = be32_to_cpu(src[1]); block[2] = be32_to_cpu(src[2]); block[3] = be32_to_cpu(src[3]); Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km); Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km); Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km); Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km); Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km); Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km); Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km); Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km); Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km); Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km); Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km); Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km); dst[0] = cpu_to_be32(block[0]); dst[1] = cpu_to_be32(block[1]); dst[2] = cpu_to_be32(block[2]); dst[3] = cpu_to_be32(block[3]); } EXPORT_SYMBOL_GPL(__cast6_decrypt); static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) { __cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); } static struct crypto_alg alg = { .cra_name = "cast6", .cra_driver_name = "cast6-generic", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = CAST6_BLOCK_SIZE, .cra_ctxsize = sizeof(struct cast6_ctx), .cra_alignmask = 3, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = CAST6_MIN_KEY_SIZE, .cia_max_keysize = CAST6_MAX_KEY_SIZE, .cia_setkey = cast6_setkey, .cia_encrypt = cast6_encrypt, .cia_decrypt = cast6_decrypt} } }; static int __init cast6_mod_init(void) { return crypto_register_alg(&alg); } static void __exit cast6_mod_fini(void) { crypto_unregister_alg(&alg); } subsys_initcall(cast6_mod_init); module_exit(cast6_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Cast6 Cipher Algorithm"); MODULE_ALIAS_CRYPTO("cast6"); MODULE_ALIAS_CRYPTO("cast6-generic"); |