Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 4 | * s390 implementation of the DES Cipher Algorithm. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (c) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 7 | * Author(s): Thomas Spatzier (tspat@de.ibm.com) |
| 8 | * |
| 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 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <asm/scatterlist.h> |
| 21 | #include <linux/crypto.h> |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 22 | #include "crypt_s390.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "crypto_des.h" |
| 24 | |
| 25 | #define DES_BLOCK_SIZE 8 |
| 26 | #define DES_KEY_SIZE 8 |
| 27 | |
| 28 | #define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE) |
| 29 | #define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE |
| 30 | |
| 31 | #define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE) |
| 32 | #define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE |
| 33 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 34 | struct crypt_s390_des_ctx { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | u8 iv[DES_BLOCK_SIZE]; |
| 36 | u8 key[DES_KEY_SIZE]; |
| 37 | }; |
| 38 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 39 | struct crypt_s390_des3_128_ctx { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | u8 iv[DES_BLOCK_SIZE]; |
| 41 | u8 key[DES3_128_KEY_SIZE]; |
| 42 | }; |
| 43 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 44 | struct crypt_s390_des3_192_ctx { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | u8 iv[DES_BLOCK_SIZE]; |
| 46 | u8 key[DES3_192_KEY_SIZE]; |
| 47 | }; |
| 48 | |
| 49 | static int |
| 50 | des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags) |
| 51 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 52 | struct crypt_s390_des_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | int ret; |
| 54 | |
| 55 | dctx = ctx; |
| 56 | //test if key is valid (not a weak key) |
| 57 | ret = crypto_des_check_key(key, keylen, flags); |
| 58 | if (ret == 0){ |
| 59 | memcpy(dctx->key, key, keylen); |
| 60 | } |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | static void |
| 66 | des_encrypt(void *ctx, u8 *dst, const u8 *src) |
| 67 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 68 | struct crypt_s390_des_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 71 | crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, dst, src, DES_BLOCK_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static void |
| 75 | des_decrypt(void *ctx, u8 *dst, const u8 *src) |
| 76 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 77 | struct crypt_s390_des_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 80 | crypt_s390_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | static struct crypto_alg des_alg = { |
| 84 | .cra_name = "des", |
| 85 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 86 | .cra_blocksize = DES_BLOCK_SIZE, |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 87 | .cra_ctxsize = sizeof(struct crypt_s390_des_ctx), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | .cra_module = THIS_MODULE, |
| 89 | .cra_list = LIST_HEAD_INIT(des_alg.cra_list), |
| 90 | .cra_u = { .cipher = { |
| 91 | .cia_min_keysize = DES_KEY_SIZE, |
| 92 | .cia_max_keysize = DES_KEY_SIZE, |
| 93 | .cia_setkey = des_setkey, |
| 94 | .cia_encrypt = des_encrypt, |
| 95 | .cia_decrypt = des_decrypt } } |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * RFC2451: |
| 100 | * |
| 101 | * For DES-EDE3, there is no known need to reject weak or |
| 102 | * complementation keys. Any weakness is obviated by the use of |
| 103 | * multiple keys. |
| 104 | * |
| 105 | * However, if the two independent 64-bit keys are equal, |
| 106 | * then the DES3 operation is simply the same as DES. |
| 107 | * Implementers MUST reject keys that exhibit this property. |
| 108 | * |
| 109 | */ |
| 110 | static int |
| 111 | des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags) |
| 112 | { |
| 113 | int i, ret; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 114 | struct crypt_s390_des3_128_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | const u8* temp_key = key; |
| 116 | |
| 117 | dctx = ctx; |
| 118 | if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE))) { |
| 119 | |
| 120 | *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED; |
| 121 | return -EINVAL; |
| 122 | } |
| 123 | for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) { |
| 124 | ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags); |
| 125 | if (ret < 0) |
| 126 | return ret; |
| 127 | } |
| 128 | memcpy(dctx->key, key, keylen); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static void |
| 133 | des3_128_encrypt(void *ctx, u8 *dst, const u8 *src) |
| 134 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 135 | struct crypt_s390_des3_128_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 138 | crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | DES3_128_BLOCK_SIZE); |
| 140 | } |
| 141 | |
| 142 | static void |
| 143 | des3_128_decrypt(void *ctx, u8 *dst, const u8 *src) |
| 144 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 145 | struct crypt_s390_des3_128_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 148 | crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | DES3_128_BLOCK_SIZE); |
| 150 | } |
| 151 | |
| 152 | static struct crypto_alg des3_128_alg = { |
| 153 | .cra_name = "des3_ede128", |
| 154 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 155 | .cra_blocksize = DES3_128_BLOCK_SIZE, |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 156 | .cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | .cra_module = THIS_MODULE, |
| 158 | .cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list), |
| 159 | .cra_u = { .cipher = { |
| 160 | .cia_min_keysize = DES3_128_KEY_SIZE, |
| 161 | .cia_max_keysize = DES3_128_KEY_SIZE, |
| 162 | .cia_setkey = des3_128_setkey, |
| 163 | .cia_encrypt = des3_128_encrypt, |
| 164 | .cia_decrypt = des3_128_decrypt } } |
| 165 | }; |
| 166 | |
| 167 | /* |
| 168 | * RFC2451: |
| 169 | * |
| 170 | * For DES-EDE3, there is no known need to reject weak or |
| 171 | * complementation keys. Any weakness is obviated by the use of |
| 172 | * multiple keys. |
| 173 | * |
| 174 | * However, if the first two or last two independent 64-bit keys are |
| 175 | * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the |
| 176 | * same as DES. Implementers MUST reject keys that exhibit this |
| 177 | * property. |
| 178 | * |
| 179 | */ |
| 180 | static int |
| 181 | des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags) |
| 182 | { |
| 183 | int i, ret; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 184 | struct crypt_s390_des3_192_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | const u8* temp_key; |
| 186 | |
| 187 | dctx = ctx; |
| 188 | temp_key = key; |
| 189 | if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) && |
| 190 | memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2], |
| 191 | DES_KEY_SIZE))) { |
| 192 | |
| 193 | *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED; |
| 194 | return -EINVAL; |
| 195 | } |
| 196 | for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) { |
| 197 | ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags); |
| 198 | if (ret < 0){ |
| 199 | return ret; |
| 200 | } |
| 201 | } |
| 202 | memcpy(dctx->key, key, keylen); |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static void |
| 207 | des3_192_encrypt(void *ctx, u8 *dst, const u8 *src) |
| 208 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 209 | struct crypt_s390_des3_192_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 212 | crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | DES3_192_BLOCK_SIZE); |
| 214 | } |
| 215 | |
| 216 | static void |
| 217 | des3_192_decrypt(void *ctx, u8 *dst, const u8 *src) |
| 218 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 219 | struct crypt_s390_des3_192_ctx *dctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | dctx = ctx; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 222 | crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | DES3_192_BLOCK_SIZE); |
| 224 | } |
| 225 | |
| 226 | static struct crypto_alg des3_192_alg = { |
| 227 | .cra_name = "des3_ede", |
| 228 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 229 | .cra_blocksize = DES3_192_BLOCK_SIZE, |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 230 | .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | .cra_module = THIS_MODULE, |
| 232 | .cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list), |
| 233 | .cra_u = { .cipher = { |
| 234 | .cia_min_keysize = DES3_192_KEY_SIZE, |
| 235 | .cia_max_keysize = DES3_192_KEY_SIZE, |
| 236 | .cia_setkey = des3_192_setkey, |
| 237 | .cia_encrypt = des3_192_encrypt, |
| 238 | .cia_decrypt = des3_192_decrypt } } |
| 239 | }; |
| 240 | |
| 241 | |
| 242 | |
| 243 | static int |
| 244 | init(void) |
| 245 | { |
| 246 | int ret; |
| 247 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 248 | if (!crypt_s390_func_available(KM_DEA_ENCRYPT) || |
| 249 | !crypt_s390_func_available(KM_TDEA_128_ENCRYPT) || |
| 250 | !crypt_s390_func_available(KM_TDEA_192_ENCRYPT)){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | return -ENOSYS; |
| 252 | } |
| 253 | |
| 254 | ret = 0; |
| 255 | ret |= (crypto_register_alg(&des_alg) == 0)? 0:1; |
| 256 | ret |= (crypto_register_alg(&des3_128_alg) == 0)? 0:2; |
| 257 | ret |= (crypto_register_alg(&des3_192_alg) == 0)? 0:4; |
| 258 | if (ret){ |
| 259 | crypto_unregister_alg(&des3_192_alg); |
| 260 | crypto_unregister_alg(&des3_128_alg); |
| 261 | crypto_unregister_alg(&des_alg); |
| 262 | return -EEXIST; |
| 263 | } |
| 264 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame] | 265 | printk(KERN_INFO "crypt_s390: des_s390 loaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static void __exit |
| 270 | fini(void) |
| 271 | { |
| 272 | crypto_unregister_alg(&des3_192_alg); |
| 273 | crypto_unregister_alg(&des3_128_alg); |
| 274 | crypto_unregister_alg(&des_alg); |
| 275 | } |
| 276 | |
| 277 | module_init(init); |
| 278 | module_exit(fini); |
| 279 | |
| 280 | MODULE_ALIAS("des"); |
| 281 | MODULE_ALIAS("des3_ede"); |
| 282 | |
| 283 | MODULE_LICENSE("GPL"); |
| 284 | MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms"); |