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 int ret;
68
69 if (!ctx->u.des3.key_len)
70 return -EINVAL;
71
72 if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
73 (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
74 (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
75 return -EINVAL;
76
77 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
78 if (!req->iv)
79 return -EINVAL;
80
81 memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
82 iv_sg = &rctx->iv_sg;
83 iv_len = DES3_EDE_BLOCK_SIZE;
84 sg_init_one(iv_sg, rctx->iv, iv_len);
85 }
86
87 memset(&rctx->cmd, 0, sizeof(rctx->cmd));
88 INIT_LIST_HEAD(&rctx->cmd.entry);
89 rctx->cmd.engine = CCP_ENGINE_DES3;
90 rctx->cmd.u.des3.type = ctx->u.des3.type;
91 rctx->cmd.u.des3.mode = ctx->u.des3.mode;
92 rctx->cmd.u.des3.action = (encrypt)
93 ? CCP_DES3_ACTION_ENCRYPT
94 : CCP_DES3_ACTION_DECRYPT;
95 rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
96 rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
97 rctx->cmd.u.des3.iv = iv_sg;
98 rctx->cmd.u.des3.iv_len = iv_len;
99 rctx->cmd.u.des3.src = req->src;
100 rctx->cmd.u.des3.src_len = req->cryptlen;
101 rctx->cmd.u.des3.dst = req->dst;
102
103 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
104
105 return ret;
106 }
107
ccp_des3_encrypt(struct skcipher_request * req)108 static int ccp_des3_encrypt(struct skcipher_request *req)
109 {
110 return ccp_des3_crypt(req, true);
111 }
112
ccp_des3_decrypt(struct skcipher_request * req)113 static int ccp_des3_decrypt(struct skcipher_request *req)
114 {
115 return ccp_des3_crypt(req, false);
116 }
117
ccp_des3_init_tfm(struct crypto_skcipher * tfm)118 static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
119 {
120 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
121
122 ctx->complete = ccp_des3_complete;
123 ctx->u.des3.key_len = 0;
124
125 crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_des3_req_ctx));
126
127 return 0;
128 }
129
130 static const struct skcipher_alg ccp_des3_defaults = {
131 .setkey = ccp_des3_setkey,
132 .encrypt = ccp_des3_encrypt,
133 .decrypt = ccp_des3_decrypt,
134 .min_keysize = DES3_EDE_KEY_SIZE,
135 .max_keysize = DES3_EDE_KEY_SIZE,
136 .init = ccp_des3_init_tfm,
137
138 .base.cra_flags = CRYPTO_ALG_ASYNC |
139 CRYPTO_ALG_ALLOCATES_MEMORY |
140 CRYPTO_ALG_KERN_DRIVER_ONLY |
141 CRYPTO_ALG_NEED_FALLBACK,
142 .base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
143 .base.cra_ctxsize = sizeof(struct ccp_ctx),
144 .base.cra_priority = CCP_CRA_PRIORITY,
145 .base.cra_module = THIS_MODULE,
146 };
147
148 struct ccp_des3_def {
149 enum ccp_des3_mode mode;
150 unsigned int version;
151 const char *name;
152 const char *driver_name;
153 unsigned int blocksize;
154 unsigned int ivsize;
155 const struct skcipher_alg *alg_defaults;
156 };
157
158 static const struct ccp_des3_def des3_algs[] = {
159 {
160 .mode = CCP_DES3_MODE_ECB,
161 .version = CCP_VERSION(5, 0),
162 .name = "ecb(des3_ede)",
163 .driver_name = "ecb-des3-ccp",
164 .blocksize = DES3_EDE_BLOCK_SIZE,
165 .ivsize = 0,
166 .alg_defaults = &ccp_des3_defaults,
167 },
168 {
169 .mode = CCP_DES3_MODE_CBC,
170 .version = CCP_VERSION(5, 0),
171 .name = "cbc(des3_ede)",
172 .driver_name = "cbc-des3-ccp",
173 .blocksize = DES3_EDE_BLOCK_SIZE,
174 .ivsize = DES3_EDE_BLOCK_SIZE,
175 .alg_defaults = &ccp_des3_defaults,
176 },
177 };
178
ccp_register_des3_alg(struct list_head * head,const struct ccp_des3_def * def)179 static int ccp_register_des3_alg(struct list_head *head,
180 const struct ccp_des3_def *def)
181 {
182 struct ccp_crypto_skcipher_alg *ccp_alg;
183 struct skcipher_alg *alg;
184 int ret;
185
186 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
187 if (!ccp_alg)
188 return -ENOMEM;
189
190 INIT_LIST_HEAD(&ccp_alg->entry);
191
192 ccp_alg->mode = def->mode;
193
194 /* Copy the defaults and override as necessary */
195 alg = &ccp_alg->alg;
196 *alg = *def->alg_defaults;
197 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
198 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
199 def->driver_name);
200 alg->base.cra_blocksize = def->blocksize;
201 alg->ivsize = def->ivsize;
202
203 ret = crypto_register_skcipher(alg);
204 if (ret) {
205 pr_err("%s skcipher algorithm registration error (%d)\n",
206 alg->base.cra_name, ret);
207 kfree(ccp_alg);
208 return ret;
209 }
210
211 list_add(&ccp_alg->entry, head);
212
213 return 0;
214 }
215
ccp_register_des3_algs(struct list_head * head)216 int ccp_register_des3_algs(struct list_head *head)
217 {
218 int i, ret;
219 unsigned int ccpversion = ccp_version();
220
221 for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
222 if (des3_algs[i].version > ccpversion)
223 continue;
224 ret = ccp_register_des3_alg(head, &des3_algs[i]);
225 if (ret)
226 return ret;
227 }
228
229 return 0;
230 }
231