1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
4  *
5  * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
6  *
7  * Author: Gary R Hook <ghook@amd.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/sched.h>
12 #include <linux/delay.h>
13 #include <linux/scatterlist.h>
14 #include <linux/crypto.h>
15 #include <crypto/algapi.h>
16 #include <crypto/scatterwalk.h>
17 #include <crypto/internal/des.h>
18 
19 #include "ccp-crypto.h"
20 
ccp_des3_complete(struct crypto_async_request * async_req,int ret)21 static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
22 {
23 	struct skcipher_request *req = skcipher_request_cast(async_req);
24 	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
25 	struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
26 
27 	if (ret)
28 		return ret;
29 
30 	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
31 		memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);
32 
33 	return 0;
34 }
35 
ccp_des3_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int key_len)36 static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
37 		unsigned int key_len)
38 {
39 	struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
40 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
41 	int err;
42 
43 	err = verify_skcipher_des3_key(tfm, key);
44 	if (err)
45 		return err;
46 
47 	/* It's not clear that there is any support for a keysize of 112.
48 	 * If needed, the caller should make K1 == K3
49 	 */
50 	ctx->u.des3.type = CCP_DES3_TYPE_168;
51 	ctx->u.des3.mode = alg->mode;
52 	ctx->u.des3.key_len = key_len;
53 
54 	memcpy(ctx->u.des3.key, key, key_len);
55 	sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
56 
57 	return 0;
58 }
59 
ccp_des3_crypt(struct skcipher_request * req,bool encrypt)60 static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)
61 {
62 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
63 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
64 	struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
65 	struct scatterlist *iv_sg = NULL;
66 	unsigned int iv_len = 0;
67 
68 	if (!ctx->u.des3.key_len)
69 		return -EINVAL;
70 
71 	if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
72 	     (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
73 	    (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
74 		return -EINVAL;
75 
76 	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
77 		if (!req->iv)
78 			return -EINVAL;
79 
80 		memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
81 		iv_sg = &rctx->iv_sg;
82 		iv_len = DES3_EDE_BLOCK_SIZE;
83 		sg_init_one(iv_sg, rctx->iv, iv_len);
84 	}
85 
86 	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
87 	INIT_LIST_HEAD(&rctx->cmd.entry);
88 	rctx->cmd.engine = CCP_ENGINE_DES3;
89 	rctx->cmd.u.des3.type = ctx->u.des3.type;
90 	rctx->cmd.u.des3.mode = ctx->u.des3.mode;
91 	rctx->cmd.u.des3.action = (encrypt)
92 				  ? CCP_DES3_ACTION_ENCRYPT
93 				  : CCP_DES3_ACTION_DECRYPT;
94 	rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
95 	rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
96 	rctx->cmd.u.des3.iv = iv_sg;
97 	rctx->cmd.u.des3.iv_len = iv_len;
98 	rctx->cmd.u.des3.src = req->src;
99 	rctx->cmd.u.des3.src_len = req->cryptlen;
100 	rctx->cmd.u.des3.dst = req->dst;
101 
102 	return ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
103 }
104 
ccp_des3_encrypt(struct skcipher_request * req)105 static int ccp_des3_encrypt(struct skcipher_request *req)
106 {
107 	return ccp_des3_crypt(req, true);
108 }
109 
ccp_des3_decrypt(struct skcipher_request * req)110 static int ccp_des3_decrypt(struct skcipher_request *req)
111 {
112 	return ccp_des3_crypt(req, false);
113 }
114 
ccp_des3_init_tfm(struct crypto_skcipher * tfm)115 static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
116 {
117 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
118 
119 	ctx->complete = ccp_des3_complete;
120 	ctx->u.des3.key_len = 0;
121 
122 	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_des3_req_ctx));
123 
124 	return 0;
125 }
126 
127 static const struct skcipher_alg ccp_des3_defaults = {
128 	.setkey			= ccp_des3_setkey,
129 	.encrypt		= ccp_des3_encrypt,
130 	.decrypt		= ccp_des3_decrypt,
131 	.min_keysize		= DES3_EDE_KEY_SIZE,
132 	.max_keysize		= DES3_EDE_KEY_SIZE,
133 	.init			= ccp_des3_init_tfm,
134 
135 	.base.cra_flags		= CRYPTO_ALG_ASYNC |
136 				  CRYPTO_ALG_ALLOCATES_MEMORY |
137 				  CRYPTO_ALG_KERN_DRIVER_ONLY |
138 				  CRYPTO_ALG_NEED_FALLBACK,
139 	.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
140 	.base.cra_ctxsize	= sizeof(struct ccp_ctx),
141 	.base.cra_priority	= CCP_CRA_PRIORITY,
142 	.base.cra_module	= THIS_MODULE,
143 };
144 
145 struct ccp_des3_def {
146 	enum ccp_des3_mode mode;
147 	unsigned int version;
148 	const char *name;
149 	const char *driver_name;
150 	unsigned int blocksize;
151 	unsigned int ivsize;
152 	const struct skcipher_alg *alg_defaults;
153 };
154 
155 static const struct ccp_des3_def des3_algs[] = {
156 	{
157 		.mode		= CCP_DES3_MODE_ECB,
158 		.version	= CCP_VERSION(5, 0),
159 		.name		= "ecb(des3_ede)",
160 		.driver_name	= "ecb-des3-ccp",
161 		.blocksize	= DES3_EDE_BLOCK_SIZE,
162 		.ivsize		= 0,
163 		.alg_defaults	= &ccp_des3_defaults,
164 	},
165 	{
166 		.mode		= CCP_DES3_MODE_CBC,
167 		.version	= CCP_VERSION(5, 0),
168 		.name		= "cbc(des3_ede)",
169 		.driver_name	= "cbc-des3-ccp",
170 		.blocksize	= DES3_EDE_BLOCK_SIZE,
171 		.ivsize		= DES3_EDE_BLOCK_SIZE,
172 		.alg_defaults	= &ccp_des3_defaults,
173 	},
174 };
175 
ccp_register_des3_alg(struct list_head * head,const struct ccp_des3_def * def)176 static int ccp_register_des3_alg(struct list_head *head,
177 				 const struct ccp_des3_def *def)
178 {
179 	struct ccp_crypto_skcipher_alg *ccp_alg;
180 	struct skcipher_alg *alg;
181 	int ret;
182 
183 	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
184 	if (!ccp_alg)
185 		return -ENOMEM;
186 
187 	INIT_LIST_HEAD(&ccp_alg->entry);
188 
189 	ccp_alg->mode = def->mode;
190 
191 	/* Copy the defaults and override as necessary */
192 	alg = &ccp_alg->alg;
193 	*alg = *def->alg_defaults;
194 	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
195 	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
196 			def->driver_name);
197 	alg->base.cra_blocksize = def->blocksize;
198 	alg->ivsize = def->ivsize;
199 
200 	ret = crypto_register_skcipher(alg);
201 	if (ret) {
202 		pr_err("%s skcipher algorithm registration error (%d)\n",
203 				alg->base.cra_name, ret);
204 		kfree(ccp_alg);
205 		return ret;
206 	}
207 
208 	list_add(&ccp_alg->entry, head);
209 
210 	return 0;
211 }
212 
ccp_register_des3_algs(struct list_head * head)213 int ccp_register_des3_algs(struct list_head *head)
214 {
215 	int i, ret;
216 	unsigned int ccpversion = ccp_version();
217 
218 	for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
219 		if (des3_algs[i].version > ccpversion)
220 			continue;
221 		ret = ccp_register_des3_alg(head, &des3_algs[i]);
222 		if (ret)
223 			return ret;
224 	}
225 
226 	return 0;
227 }
228