ccp-crypto-des3.c

  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 <crypto/internal/des.h>
 11#include <crypto/internal/skcipher.h>
 12#include <linux/err.h>
 13#include <linux/kernel.h>
 14#include <linux/list.h>
 15#include <linux/module.h>
 16#include <linux/scatterlist.h>
 17#include <linux/slab.h>
 18#include <linux/string.h>
 19
 20#include "ccp-crypto.h"
 21
 22static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
 23{
 24	struct skcipher_request *req = skcipher_request_cast(async_req);
 25	struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(
 26		crypto_skcipher_reqtfm(req));
 27	struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req);
 28
 29	if (ret)
 30		return ret;
 31
 32	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
 33		memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);
 34
 35	return 0;
 36}
 37
 38static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
 39		unsigned int key_len)
 40{
 41	struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
 42	struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
 43	int err;
 44
 45	err = verify_skcipher_des3_key(tfm, key);
 46	if (err)
 47		return err;
 48
 49	/* It's not clear that there is any support for a keysize of 112.
 50	 * If needed, the caller should make K1 == K3
 51	 */
 52	ctx->u.des3.type = CCP_DES3_TYPE_168;
 53	ctx->u.des3.mode = alg->mode;
 54	ctx->u.des3.key_len = key_len;
 55
 56	memcpy(ctx->u.des3.key, key, key_len);
 57	sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
 58
 59	return 0;
 60}
 61
 62static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)
 63{
 64	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 65	struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
 66	struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req);
 67	struct scatterlist *iv_sg = NULL;
 68	unsigned int iv_len = 0;
 69
 70	if (!ctx->u.des3.key_len)
 71		return -EINVAL;
 72
 73	if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
 74	     (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
 75	    (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
 76		return -EINVAL;
 77
 78	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
 79		if (!req->iv)
 80			return -EINVAL;
 81
 82		memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
 83		iv_sg = &rctx->iv_sg;
 84		iv_len = DES3_EDE_BLOCK_SIZE;
 85		sg_init_one(iv_sg, rctx->iv, iv_len);
 86	}
 87
 88	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
 89	INIT_LIST_HEAD(&rctx->cmd.entry);
 90	rctx->cmd.engine = CCP_ENGINE_DES3;
 91	rctx->cmd.u.des3.type = ctx->u.des3.type;
 92	rctx->cmd.u.des3.mode = ctx->u.des3.mode;
 93	rctx->cmd.u.des3.action = (encrypt)
 94				  ? CCP_DES3_ACTION_ENCRYPT
 95				  : CCP_DES3_ACTION_DECRYPT;
 96	rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
 97	rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
 98	rctx->cmd.u.des3.iv = iv_sg;
 99	rctx->cmd.u.des3.iv_len = iv_len;
100	rctx->cmd.u.des3.src = req->src;
101	rctx->cmd.u.des3.src_len = req->cryptlen;
102	rctx->cmd.u.des3.dst = req->dst;
103
104	return ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
105}
106
107static int ccp_des3_encrypt(struct skcipher_request *req)
108{
109	return ccp_des3_crypt(req, true);
110}
111
112static int ccp_des3_decrypt(struct skcipher_request *req)
113{
114	return ccp_des3_crypt(req, false);
115}
116
117static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
118{
119	struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
120
121	ctx->complete = ccp_des3_complete;
122	ctx->u.des3.key_len = 0;
123
124	crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct ccp_des3_req_ctx));
125
126	return 0;
127}
128
129static const struct skcipher_alg ccp_des3_defaults = {
130	.setkey			= ccp_des3_setkey,
131	.encrypt		= ccp_des3_encrypt,
132	.decrypt		= ccp_des3_decrypt,
133	.min_keysize		= DES3_EDE_KEY_SIZE,
134	.max_keysize		= DES3_EDE_KEY_SIZE,
135	.init			= ccp_des3_init_tfm,
136
137	.base.cra_flags		= CRYPTO_ALG_ASYNC |
138				  CRYPTO_ALG_ALLOCATES_MEMORY |
139				  CRYPTO_ALG_KERN_DRIVER_ONLY |
140				  CRYPTO_ALG_NEED_FALLBACK,
141	.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
142	.base.cra_ctxsize	= sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,
143	.base.cra_priority	= CCP_CRA_PRIORITY,
144	.base.cra_module	= THIS_MODULE,
145};
146
147struct ccp_des3_def {
148	enum ccp_des3_mode mode;
149	unsigned int version;
150	const char *name;
151	const char *driver_name;
152	unsigned int blocksize;
153	unsigned int ivsize;
154	const struct skcipher_alg *alg_defaults;
155};
156
157static const struct ccp_des3_def des3_algs[] = {
158	{
159		.mode		= CCP_DES3_MODE_ECB,
160		.version	= CCP_VERSION(5, 0),
161		.name		= "ecb(des3_ede)",
162		.driver_name	= "ecb-des3-ccp",
163		.blocksize	= DES3_EDE_BLOCK_SIZE,
164		.ivsize		= 0,
165		.alg_defaults	= &ccp_des3_defaults,
166	},
167	{
168		.mode		= CCP_DES3_MODE_CBC,
169		.version	= CCP_VERSION(5, 0),
170		.name		= "cbc(des3_ede)",
171		.driver_name	= "cbc-des3-ccp",
172		.blocksize	= DES3_EDE_BLOCK_SIZE,
173		.ivsize		= DES3_EDE_BLOCK_SIZE,
174		.alg_defaults	= &ccp_des3_defaults,
175	},
176};
177
178static int ccp_register_des3_alg(struct list_head *head,
179				 const struct ccp_des3_def *def)
180{
181	struct ccp_crypto_skcipher_alg *ccp_alg;
182	struct skcipher_alg *alg;
183	int ret;
184
185	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
186	if (!ccp_alg)
187		return -ENOMEM;
188
189	INIT_LIST_HEAD(&ccp_alg->entry);
190
191	ccp_alg->mode = def->mode;
192
193	/* Copy the defaults and override as necessary */
194	alg = &ccp_alg->alg;
195	*alg = *def->alg_defaults;
196	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
197	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
198			def->driver_name);
199	alg->base.cra_blocksize = def->blocksize;
200	alg->ivsize = def->ivsize;
201
202	ret = crypto_register_skcipher(alg);
203	if (ret) {
204		pr_err("%s skcipher algorithm registration error (%d)\n",
205				alg->base.cra_name, ret);
206		kfree(ccp_alg);
207		return ret;
208	}
209
210	list_add(&ccp_alg->entry, head);
211
212	return 0;
213}
214
215int ccp_register_des3_algs(struct list_head *head)
216{
217	int i, ret;
218	unsigned int ccpversion = ccp_version();
219
220	for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
221		if (des3_algs[i].version > ccpversion)
222			continue;
223		ret = ccp_register_des3_alg(head, &des3_algs[i]);
224		if (ret)
225			return ret;
226	}
227
228	return 0;
229}