summaryrefslogtreecommitdiffstats
path: root/arch/s390/crypto/des_s390.c
blob: cc5420118393472db02d967efd08602a99af7e73 (plain)
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
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
/*
 * Cryptographic API.
 *
 * s390 implementation of the DES Cipher Algorithm.
 *
 * Copyright IBM Corp. 2003,2007
 * Author(s): Thomas Spatzier
 *	      Jan Glauber (jan.glauber@de.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/des.h>

#include "crypt_s390.h"

#define DES3_192_KEY_SIZE	(3 * DES_KEY_SIZE)

struct crypt_s390_des_ctx {
	u8 iv[DES_BLOCK_SIZE];
	u8 key[DES_KEY_SIZE];
};

struct crypt_s390_des3_192_ctx {
	u8 iv[DES_BLOCK_SIZE];
	u8 key[DES3_192_KEY_SIZE];
};

static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
		      unsigned int keylen)
{
	struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
	u32 *flags = &tfm->crt_flags;
	u32 tmp[DES_EXPKEY_WORDS];

	/* check for weak keys */
	if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
		return -EINVAL;
	}

	memcpy(dctx->key, key, keylen);
	return 0;
}

static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
	struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}

static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
	struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_DEA_DECRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}

static struct crypto_alg des_alg = {
	.cra_name		=	"des",
	.cra_driver_name	=	"des-s390",
	.cra_priority		=	CRYPT_S390_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(des_alg.cra_list),
	.cra_u			=	{
		.cipher = {
			.cia_min_keysize	=	DES_KEY_SIZE,
			.cia_max_keysize	=	DES_KEY_SIZE,
			.cia_setkey		=	des_setkey,
			.cia_encrypt		=	des_encrypt,
			.cia_decrypt		=	des_decrypt,
		}
	}
};

static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
			    void *param, struct blkcipher_walk *walk)
{
	int ret = blkcipher_walk_virt(desc, walk);
	unsigned int nbytes;

	while ((nbytes = walk->nbytes)) {
		/* only use complete blocks */
		unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
		u8 *out = walk->dst.virt.addr;
		u8 *in = walk->src.virt.addr;

		ret = crypt_s390_km(func, param, out, in, n);
		BUG_ON((ret < 0) || (ret != n));

		nbytes &= DES_BLOCK_SIZE - 1;
		ret = blkcipher_walk_done(desc, walk, nbytes);
	}

	return ret;
}

static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
			    void *param, struct blkcipher_walk *walk)
{
	int ret = blkcipher_walk_virt(desc, walk);
	unsigned int nbytes = walk->nbytes;

	if (!nbytes)
		goto out;

	memcpy(param, walk->iv, DES_BLOCK_SIZE);
	do {
		/* only use complete blocks */
		unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
		u8 *out = walk->dst.virt.addr;
		u8 *in = walk->src.virt.addr;

		ret = crypt_s390_kmc(func, param, out, in, n);
		BUG_ON((ret < 0) || (ret != n));

		nbytes &= DES_BLOCK_SIZE - 1;
		ret = blkcipher_walk_done(desc, walk, nbytes);
	} while ((nbytes = walk->nbytes));
	memcpy(walk->iv, param, DES_BLOCK_SIZE);

out:
	return ret;
}

static int ecb_des_encrypt(struct blkcipher_desc *desc,
			   struct scatterlist *dst, struct scatterlist *src,
			   unsigned int nbytes)
{
	struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, sctx->key, &walk);
}

static int ecb_des_decrypt(struct blkcipher_desc *desc,
			   struct scatterlist *dst, struct scatterlist *src,
			   unsigned int nbytes)
{
	struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_DEA_DECRYPT, sctx->key, &walk);
}

static struct crypto_alg ecb_des_alg = {
	.cra_name		=	"ecb(des)",
	.cra_driver_name	=	"ecb-des-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(ecb_des_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES_KEY_SIZE,
			.max_keysize		=	DES_KEY_SIZE,
			.setkey			=	des_setkey,
			.encrypt		=	ecb_des_encrypt,
			.decrypt		=	ecb_des_decrypt,
		}
	}
};

static int cbc_des_encrypt(struct blkcipher_desc *desc,
			   struct scatterlist *dst, struct scatterlist *src,
			   unsigned int nbytes)
{
	struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, sctx->iv, &walk);
}

static int cbc_des_decrypt(struct blkcipher_desc *desc,
			   struct scatterlist *dst, struct scatterlist *src,
			   unsigned int nbytes)
{
	struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, sctx->iv, &walk);
}

static struct crypto_alg cbc_des_alg = {
	.cra_name		=	"cbc(des)",
	.cra_driver_name	=	"cbc-des-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(cbc_des_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES_KEY_SIZE,
			.max_keysize		=	DES_KEY_SIZE,
			.ivsize			=	DES_BLOCK_SIZE,
			.setkey			=	des_setkey,
			.encrypt		=	cbc_des_encrypt,
			.decrypt		=	cbc_des_decrypt,
		}
	}
};

/*
 * RFC2451:
 *
 *   For DES-EDE3, there is no known need to reject weak or
 *   complementation keys.  Any weakness is obviated by the use of
 *   multiple keys.
 *
 *   However, if the first two or last two independent 64-bit keys are
 *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
 *   same as DES.  Implementers MUST reject keys that exhibit this
 *   property.
 *
 */
static int des3_192_setkey(struct crypto_tfm *tfm, const u8 *key,
			   unsigned int keylen)
{
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
	u32 *flags = &tfm->crt_flags;

	if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
	    memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
		   DES_KEY_SIZE)) &&
	    (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
		return -EINVAL;
	}
	memcpy(dctx->key, key, keylen);
	return 0;
}

static void des3_192_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
		      DES_BLOCK_SIZE);
}

static void des3_192_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
		      DES_BLOCK_SIZE);
}

static struct crypto_alg des3_192_alg = {
	.cra_name		=	"des3_ede",
	.cra_driver_name	=	"des3_ede-s390",
	.cra_priority		=	CRYPT_S390_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(des3_192_alg.cra_list),
	.cra_u			=	{
		.cipher = {
			.cia_min_keysize	=	DES3_192_KEY_SIZE,
			.cia_max_keysize	=	DES3_192_KEY_SIZE,
			.cia_setkey		=	des3_192_setkey,
			.cia_encrypt		=	des3_192_encrypt,
			.cia_decrypt		=	des3_192_decrypt,
		}
	}
};

static int ecb_des3_192_encrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, sctx->key, &walk);
}

static int ecb_des3_192_decrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, sctx->key, &walk);
}

static struct crypto_alg ecb_des3_192_alg = {
	.cra_name		=	"ecb(des3_ede)",
	.cra_driver_name	=	"ecb-des3_ede-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						ecb_des3_192_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_192_KEY_SIZE,
			.max_keysize		=	DES3_192_KEY_SIZE,
			.setkey			=	des3_192_setkey,
			.encrypt		=	ecb_des3_192_encrypt,
			.decrypt		=	ecb_des3_192_decrypt,
		}
	}
};

static int cbc_des3_192_encrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, sctx->iv, &walk);
}

static int cbc_des3_192_decrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, sctx->iv, &walk);
}

static struct crypto_alg cbc_des3_192_alg = {
	.cra_name		=	"cbc(des3_ede)",
	.cra_driver_name	=	"cbc-des3_ede-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						cbc_des3_192_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_192_KEY_SIZE,
			.max_keysize		=	DES3_192_KEY_SIZE,
			.ivsize			=	DES_BLOCK_SIZE,
			.setkey			=	des3_192_setkey,
			.encrypt		=	cbc_des3_192_encrypt,
			.decrypt		=	cbc_des3_192_decrypt,
		}
	}
};

static int des_s390_init(void)
{
	int ret;

	if (!crypt_s390_func_available(KM_DEA_ENCRYPT) ||
	    !crypt_s390_func_available(KM_TDEA_192_ENCRYPT))
		return -EOPNOTSUPP;

	ret = crypto_register_alg(&des_alg);
	if (ret)
		goto des_err;
	ret = crypto_register_alg(&ecb_des_alg);
	if (ret)
		goto ecb_des_err;
	ret = crypto_register_alg(&cbc_des_alg);
	if (ret)
		goto cbc_des_err;
	ret = crypto_register_alg(&des3_192_alg);
	if (ret)
		goto des3_192_err;
	ret = crypto_register_alg(&ecb_des3_192_alg);
	if (ret)
		goto ecb_des3_192_err;
	ret = crypto_register_alg(&cbc_des3_192_alg);
	if (ret)
		goto cbc_des3_192_err;
out:
	return ret;

cbc_des3_192_err:
	crypto_unregister_alg(&ecb_des3_192_alg);
ecb_des3_192_err:
	crypto_unregister_alg(&des3_192_alg);
des3_192_err:
	crypto_unregister_alg(&cbc_des_alg);
cbc_des_err:
	crypto_unregister_alg(&ecb_des_alg);
ecb_des_err:
	crypto_unregister_alg(&des_alg);
des_err:
	goto out;
}

static void __exit des_s390_exit(void)
{
	crypto_unregister_alg(&cbc_des3_192_alg);
	crypto_unregister_alg(&ecb_des3_192_alg);
	crypto_unregister_alg(&des3_192_alg);
	crypto_unregister_alg(&cbc_des_alg);
	crypto_unregister_alg(&ecb_des_alg);
	crypto_unregister_alg(&des_alg);
}

module_init(des_s390_init);
module_exit(des_s390_exit);

MODULE_ALIAS("des");
MODULE_ALIAS("des3_ede");

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
OpenPOWER on IntegriCloud