summaryrefslogtreecommitdiff
path: root/drivers/crypto/ccp/ccp-crypto-des3.c
blob: 5af7347ae03cd1c3641da49784c2f489f9ea7c34 (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
/*
 * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
 *
 * Copyright (C) 2016 Advanced Micro Devices, Inc.
 *
 * Author: Gary R Hook <ghook@amd.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/scatterwalk.h>
#include <crypto/des.h>

#include "ccp-crypto.h"

static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
{
	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);

	if (ret)
		return ret;

	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
		memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE);

	return 0;
}

static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
		unsigned int key_len)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
	struct ccp_crypto_ablkcipher_alg *alg =
		ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
	u32 *flags = &tfm->base.crt_flags;


	/* From des_generic.c:
	 *
	 * RFC2451:
	 *   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.
	 */
	const u32 *K = (const u32 *)key;

	if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
		     !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
		     (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
		return -EINVAL;
	}

	/* It's not clear that there is any support for a keysize of 112.
	 * If needed, the caller should make K1 == K3
	 */
	ctx->u.des3.type = CCP_DES3_TYPE_168;
	ctx->u.des3.mode = alg->mode;
	ctx->u.des3.key_len = key_len;

	memcpy(ctx->u.des3.key, key, key_len);
	sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);

	return 0;
}

static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);
	struct scatterlist *iv_sg = NULL;
	unsigned int iv_len = 0;
	int ret;

	if (!ctx->u.des3.key_len)
		return -EINVAL;

	if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
	     (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
	    (req->nbytes & (DES3_EDE_BLOCK_SIZE - 1)))
		return -EINVAL;

	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
		if (!req->info)
			return -EINVAL;

		memcpy(rctx->iv, req->info, DES3_EDE_BLOCK_SIZE);
		iv_sg = &rctx->iv_sg;
		iv_len = DES3_EDE_BLOCK_SIZE;
		sg_init_one(iv_sg, rctx->iv, iv_len);
	}

	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	INIT_LIST_HEAD(&rctx->cmd.entry);
	rctx->cmd.engine = CCP_ENGINE_DES3;
	rctx->cmd.u.des3.type = ctx->u.des3.type;
	rctx->cmd.u.des3.mode = ctx->u.des3.mode;
	rctx->cmd.u.des3.action = (encrypt)
				  ? CCP_DES3_ACTION_ENCRYPT
				  : CCP_DES3_ACTION_DECRYPT;
	rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
	rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
	rctx->cmd.u.des3.iv = iv_sg;
	rctx->cmd.u.des3.iv_len = iv_len;
	rctx->cmd.u.des3.src = req->src;
	rctx->cmd.u.des3.src_len = req->nbytes;
	rctx->cmd.u.des3.dst = req->dst;

	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);

	return ret;
}

static int ccp_des3_encrypt(struct ablkcipher_request *req)
{
	return ccp_des3_crypt(req, true);
}

static int ccp_des3_decrypt(struct ablkcipher_request *req)
{
	return ccp_des3_crypt(req, false);
}

static int ccp_des3_cra_init(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->complete = ccp_des3_complete;
	ctx->u.des3.key_len = 0;

	tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx);

	return 0;
}

static void ccp_des3_cra_exit(struct crypto_tfm *tfm)
{
}

static struct crypto_alg ccp_des3_defaults = {
	.cra_flags	= CRYPTO_ALG_TYPE_ABLKCIPHER |
		CRYPTO_ALG_ASYNC |
		CRYPTO_ALG_KERN_DRIVER_ONLY |
		CRYPTO_ALG_NEED_FALLBACK,
	.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
	.cra_ctxsize	= sizeof(struct ccp_ctx),
	.cra_priority	= CCP_CRA_PRIORITY,
	.cra_type	= &crypto_ablkcipher_type,
	.cra_init	= ccp_des3_cra_init,
	.cra_exit	= ccp_des3_cra_exit,
	.cra_module	= THIS_MODULE,
	.cra_ablkcipher	= {
		.setkey		= ccp_des3_setkey,
		.encrypt	= ccp_des3_encrypt,
		.decrypt	= ccp_des3_decrypt,
		.min_keysize	= DES3_EDE_KEY_SIZE,
		.max_keysize	= DES3_EDE_KEY_SIZE,
	},
};

struct ccp_des3_def {
	enum ccp_des3_mode mode;
	unsigned int version;
	const char *name;
	const char *driver_name;
	unsigned int blocksize;
	unsigned int ivsize;
	struct crypto_alg *alg_defaults;
};

static struct ccp_des3_def des3_algs[] = {
	{
		.mode		= CCP_DES3_MODE_ECB,
		.version	= CCP_VERSION(5, 0),
		.name		= "ecb(des3_ede)",
		.driver_name	= "ecb-des3-ccp",
		.blocksize	= DES3_EDE_BLOCK_SIZE,
		.ivsize		= 0,
		.alg_defaults	= &ccp_des3_defaults,
	},
	{
		.mode		= CCP_DES3_MODE_CBC,
		.version	= CCP_VERSION(5, 0),
		.name		= "cbc(des3_ede)",
		.driver_name	= "cbc-des3-ccp",
		.blocksize	= DES3_EDE_BLOCK_SIZE,
		.ivsize		= DES3_EDE_BLOCK_SIZE,
		.alg_defaults	= &ccp_des3_defaults,
	},
};

static int ccp_register_des3_alg(struct list_head *head,
				 const struct ccp_des3_def *def)
{
	struct ccp_crypto_ablkcipher_alg *ccp_alg;
	struct crypto_alg *alg;
	int ret;

	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	if (!ccp_alg)
		return -ENOMEM;

	INIT_LIST_HEAD(&ccp_alg->entry);

	ccp_alg->mode = def->mode;

	/* Copy the defaults and override as necessary */
	alg = &ccp_alg->alg;
	*alg = *def->alg_defaults;
	snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
			def->driver_name);
	alg->cra_blocksize = def->blocksize;
	alg->cra_ablkcipher.ivsize = def->ivsize;

	ret = crypto_register_alg(alg);
	if (ret) {
		pr_err("%s ablkcipher algorithm registration error (%d)\n",
				alg->cra_name, ret);
		kfree(ccp_alg);
		return ret;
	}

	list_add(&ccp_alg->entry, head);

	return 0;
}

int ccp_register_des3_algs(struct list_head *head)
{
	int i, ret;
	unsigned int ccpversion = ccp_version();

	for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
		if (des3_algs[i].version > ccpversion)
			continue;
		ret = ccp_register_des3_alg(head, &des3_algs[i]);
		if (ret)
			return ret;
	}

	return 0;
}