1/* 2 * Cryptographic API. 3 * 4 * s390 implementation of the DES Cipher Algorithm. 5 * 6 * Copyright IBM Corp. 2003,2007 7 * Author(s): Thomas Spatzier 8 * Jan Glauber (jan.glauber@de.ibm.com) 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 */ 16 17#include <linux/init.h> 18#include <linux/module.h> 19#include <linux/crypto.h> 20#include <crypto/algapi.h> 21#include <crypto/des.h> 22 23#include "crypt_s390.h" 24 25#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE) 26 27struct crypt_s390_des_ctx { 28 u8 iv[DES_BLOCK_SIZE]; 29 u8 key[DES_KEY_SIZE]; 30}; 31 32struct crypt_s390_des3_192_ctx { 33 u8 iv[DES_BLOCK_SIZE]; 34 u8 key[DES3_192_KEY_SIZE]; 35}; 36 37static int des_setkey(struct crypto_tfm *tfm, const u8 *key, 38 unsigned int keylen) 39{ 40 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm); 41 u32 *flags = &tfm->crt_flags; 42 u32 tmp[DES_EXPKEY_WORDS]; 43 44 /* check for weak keys */ 45 if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) { 46 *flags |= CRYPTO_TFM_RES_WEAK_KEY; 47 return -EINVAL; 48 } 49 50 memcpy(dctx->key, key, keylen); 51 return 0; 52} 53 54static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 55{ 56 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm); 57 58 crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, out, in, DES_BLOCK_SIZE); 59} 60 61static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 62{ 63 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm); 64 65 crypt_s390_km(KM_DEA_DECRYPT, dctx->key, out, in, DES_BLOCK_SIZE); 66} 67 68static struct crypto_alg des_alg = { 69 .cra_name = "des", 70 .cra_driver_name = "des-s390", 71 .cra_priority = CRYPT_S390_PRIORITY, 72 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 73 .cra_blocksize = DES_BLOCK_SIZE, 74 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx), 75 .cra_module = THIS_MODULE, 76 .cra_list = LIST_HEAD_INIT(des_alg.cra_list), 77 .cra_u = { 78 .cipher = { 79 .cia_min_keysize = DES_KEY_SIZE, 80 .cia_max_keysize = DES_KEY_SIZE, 81 .cia_setkey = des_setkey, 82 .cia_encrypt = des_encrypt, 83 .cia_decrypt = des_decrypt, 84 } 85 } 86}; 87 88static int ecb_desall_crypt(struct blkcipher_desc *desc, long func, 89 void *param, struct blkcipher_walk *walk) 90{ 91 int ret = blkcipher_walk_virt(desc, walk); 92 unsigned int nbytes; 93 94 while ((nbytes = walk->nbytes)) { 95 /* only use complete blocks */ 96 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1); 97 u8 *out = walk->dst.virt.addr; 98 u8 *in = walk->src.virt.addr; 99 100 ret = crypt_s390_km(func, param, out, in, n); 101 BUG_ON((ret < 0) || (ret != n)); 102 103 nbytes &= DES_BLOCK_SIZE - 1; 104 ret = blkcipher_walk_done(desc, walk, nbytes); 105 } 106 107 return ret; 108} 109 110static int cbc_desall_crypt(struct blkcipher_desc *desc, long func, 111 void *param, struct blkcipher_walk *walk) 112{ 113 int ret = blkcipher_walk_virt(desc, walk); 114 unsigned int nbytes = walk->nbytes; 115 116 if (!nbytes) 117 goto out; 118 119 memcpy(param, walk->iv, DES_BLOCK_SIZE); 120 do { 121 /* only use complete blocks */ 122 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1); 123 u8 *out = walk->dst.virt.addr; 124 u8 *in = walk->src.virt.addr; 125 126 ret = crypt_s390_kmc(func, param, out, in, n); 127 BUG_ON((ret < 0) || (ret != n)); 128 129 nbytes &= DES_BLOCK_SIZE - 1; 130 ret = blkcipher_walk_done(desc, walk, nbytes); 131 } while ((nbytes = walk->nbytes)); 132 memcpy(walk->iv, param, DES_BLOCK_SIZE); 133 134out: 135 return ret; 136} 137 138static int ecb_des_encrypt(struct blkcipher_desc *desc, 139 struct scatterlist *dst, struct scatterlist *src, 140 unsigned int nbytes) 141{ 142 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 143 struct blkcipher_walk walk; 144 145 blkcipher_walk_init(&walk, dst, src, nbytes); 146 return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, sctx->key, &walk); 147} 148 149static int ecb_des_decrypt(struct blkcipher_desc *desc, 150 struct scatterlist *dst, struct scatterlist *src, 151 unsigned int nbytes) 152{ 153 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 154 struct blkcipher_walk walk; 155 156 blkcipher_walk_init(&walk, dst, src, nbytes); 157 return ecb_desall_crypt(desc, KM_DEA_DECRYPT, sctx->key, &walk); 158} 159 160static struct crypto_alg ecb_des_alg = { 161 .cra_name = "ecb(des)", 162 .cra_driver_name = "ecb-des-s390", 163 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY, 164 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 165 .cra_blocksize = DES_BLOCK_SIZE, 166 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx), 167 .cra_type = &crypto_blkcipher_type, 168 .cra_module = THIS_MODULE, 169 .cra_list = LIST_HEAD_INIT(ecb_des_alg.cra_list), 170 .cra_u = { 171 .blkcipher = { 172 .min_keysize = DES_KEY_SIZE, 173 .max_keysize = DES_KEY_SIZE, 174 .setkey = des_setkey, 175 .encrypt = ecb_des_encrypt, 176 .decrypt = ecb_des_decrypt, 177 } 178 } 179}; 180 181static int cbc_des_encrypt(struct blkcipher_desc *desc, 182 struct scatterlist *dst, struct scatterlist *src, 183 unsigned int nbytes) 184{ 185 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 186 struct blkcipher_walk walk; 187 188 blkcipher_walk_init(&walk, dst, src, nbytes); 189 return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, sctx->iv, &walk); 190} 191 192static int cbc_des_decrypt(struct blkcipher_desc *desc, 193 struct scatterlist *dst, struct scatterlist *src, 194 unsigned int nbytes) 195{ 196 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 197 struct blkcipher_walk walk; 198 199 blkcipher_walk_init(&walk, dst, src, nbytes); 200 return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, sctx->iv, &walk); 201} 202 203static struct crypto_alg cbc_des_alg = { 204 .cra_name = "cbc(des)", 205 .cra_driver_name = "cbc-des-s390", 206 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY, 207 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 208 .cra_blocksize = DES_BLOCK_SIZE, 209 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx), 210 .cra_type = &crypto_blkcipher_type, 211 .cra_module = THIS_MODULE, 212 .cra_list = LIST_HEAD_INIT(cbc_des_alg.cra_list), 213 .cra_u = { 214 .blkcipher = { 215 .min_keysize = DES_KEY_SIZE, 216 .max_keysize = DES_KEY_SIZE, 217 .ivsize = DES_BLOCK_SIZE, 218 .setkey = des_setkey, 219 .encrypt = cbc_des_encrypt, 220 .decrypt = cbc_des_decrypt, 221 } 222 } 223}; 224 225/* 226 * RFC2451: 227 * 228 * For DES-EDE3, there is no known need to reject weak or 229 * complementation keys. Any weakness is obviated by the use of 230 * multiple keys. 231 * 232 * However, if the first two or last two independent 64-bit keys are 233 * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the 234 * same as DES. Implementers MUST reject keys that exhibit this 235 * property. 236 * 237 */ 238static int des3_192_setkey(struct crypto_tfm *tfm, const u8 *key, 239 unsigned int keylen) 240{ 241 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm); 242 u32 *flags = &tfm->crt_flags; 243 244 if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) && 245 memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2], 246 DES_KEY_SIZE)) && 247 (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) { 248 *flags |= CRYPTO_TFM_RES_WEAK_KEY; 249 return -EINVAL; 250 } 251 memcpy(dctx->key, key, keylen); 252 return 0; 253} 254 255static void des3_192_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 256{ 257 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm); 258 259 crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src, 260 DES_BLOCK_SIZE); 261} 262 263static void des3_192_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 264{ 265 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm); 266 267 crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src, 268 DES_BLOCK_SIZE); 269} 270 271static struct crypto_alg des3_192_alg = { 272 .cra_name = "des3_ede", 273 .cra_driver_name = "des3_ede-s390", 274 .cra_priority = CRYPT_S390_PRIORITY, 275 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 276 .cra_blocksize = DES_BLOCK_SIZE, 277 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx), 278 .cra_module = THIS_MODULE, 279 .cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list), 280 .cra_u = { 281 .cipher = { 282 .cia_min_keysize = DES3_192_KEY_SIZE, 283 .cia_max_keysize = DES3_192_KEY_SIZE, 284 .cia_setkey = des3_192_setkey, 285 .cia_encrypt = des3_192_encrypt, 286 .cia_decrypt = des3_192_decrypt, 287 } 288 } 289}; 290 291static int ecb_des3_192_encrypt(struct blkcipher_desc *desc, 292 struct scatterlist *dst, 293 struct scatterlist *src, unsigned int nbytes) 294{ 295 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 296 struct blkcipher_walk walk; 297 298 blkcipher_walk_init(&walk, dst, src, nbytes); 299 return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, sctx->key, &walk); 300} 301 302static int ecb_des3_192_decrypt(struct blkcipher_desc *desc, 303 struct scatterlist *dst, 304 struct scatterlist *src, unsigned int nbytes) 305{ 306 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 307 struct blkcipher_walk walk; 308 309 blkcipher_walk_init(&walk, dst, src, nbytes); 310 return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, sctx->key, &walk); 311} 312 313static struct crypto_alg ecb_des3_192_alg = { 314 .cra_name = "ecb(des3_ede)", 315 .cra_driver_name = "ecb-des3_ede-s390", 316 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY, 317 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 318 .cra_blocksize = DES_BLOCK_SIZE, 319 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx), 320 .cra_type = &crypto_blkcipher_type, 321 .cra_module = THIS_MODULE, 322 .cra_list = LIST_HEAD_INIT( 323 ecb_des3_192_alg.cra_list), 324 .cra_u = { 325 .blkcipher = { 326 .min_keysize = DES3_192_KEY_SIZE, 327 .max_keysize = DES3_192_KEY_SIZE, 328 .setkey = des3_192_setkey, 329 .encrypt = ecb_des3_192_encrypt, 330 .decrypt = ecb_des3_192_decrypt, 331 } 332 } 333}; 334 335static int cbc_des3_192_encrypt(struct blkcipher_desc *desc, 336 struct scatterlist *dst, 337 struct scatterlist *src, unsigned int nbytes) 338{ 339 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 340 struct blkcipher_walk walk; 341 342 blkcipher_walk_init(&walk, dst, src, nbytes); 343 return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, sctx->iv, &walk); 344} 345 346static int cbc_des3_192_decrypt(struct blkcipher_desc *desc, 347 struct scatterlist *dst, 348 struct scatterlist *src, unsigned int nbytes) 349{ 350 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); 351 struct blkcipher_walk walk; 352 353 blkcipher_walk_init(&walk, dst, src, nbytes); 354 return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, sctx->iv, &walk); 355} 356 357static struct crypto_alg cbc_des3_192_alg = { 358 .cra_name = "cbc(des3_ede)", 359 .cra_driver_name = "cbc-des3_ede-s390", 360 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY, 361 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 362 .cra_blocksize = DES_BLOCK_SIZE, 363 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx), 364 .cra_type = &crypto_blkcipher_type, 365 .cra_module = THIS_MODULE, 366 .cra_list = LIST_HEAD_INIT( 367 cbc_des3_192_alg.cra_list), 368 .cra_u = { 369 .blkcipher = { 370 .min_keysize = DES3_192_KEY_SIZE, 371 .max_keysize = DES3_192_KEY_SIZE, 372 .ivsize = DES_BLOCK_SIZE, 373 .setkey = des3_192_setkey, 374 .encrypt = cbc_des3_192_encrypt, 375 .decrypt = cbc_des3_192_decrypt, 376 } 377 } 378}; 379 380static int des_s390_init(void) 381{ 382 int ret; 383 384 if (!crypt_s390_func_available(KM_DEA_ENCRYPT) || 385 !crypt_s390_func_available(KM_TDEA_192_ENCRYPT)) 386 return -EOPNOTSUPP; 387 388 ret = crypto_register_alg(&des_alg); 389 if (ret) 390 goto des_err; 391 ret = crypto_register_alg(&ecb_des_alg); 392 if (ret) 393 goto ecb_des_err; 394 ret = crypto_register_alg(&cbc_des_alg); 395 if (ret) 396 goto cbc_des_err; 397 ret = crypto_register_alg(&des3_192_alg); 398 if (ret) 399 goto des3_192_err; 400 ret = crypto_register_alg(&ecb_des3_192_alg); 401 if (ret) 402 goto ecb_des3_192_err; 403 ret = crypto_register_alg(&cbc_des3_192_alg); 404 if (ret) 405 goto cbc_des3_192_err; 406out: 407 return ret; 408 409cbc_des3_192_err: 410 crypto_unregister_alg(&ecb_des3_192_alg); 411ecb_des3_192_err: 412 crypto_unregister_alg(&des3_192_alg); 413des3_192_err: 414 crypto_unregister_alg(&cbc_des_alg); 415cbc_des_err: 416 crypto_unregister_alg(&ecb_des_alg); 417ecb_des_err: 418 crypto_unregister_alg(&des_alg); 419des_err: 420 goto out; 421} 422 423static void __exit des_s390_exit(void) 424{ 425 crypto_unregister_alg(&cbc_des3_192_alg); 426 crypto_unregister_alg(&ecb_des3_192_alg); 427 crypto_unregister_alg(&des3_192_alg); 428 crypto_unregister_alg(&cbc_des_alg); 429 crypto_unregister_alg(&ecb_des_alg); 430 crypto_unregister_alg(&des_alg); 431} 432 433module_init(des_s390_init); 434module_exit(des_s390_exit); 435 436MODULE_ALIAS("des"); 437MODULE_ALIAS("des3_ede"); 438 439MODULE_LICENSE("GPL"); 440MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms"); 441