[linux-2.6-block.git] / drivers / crypto / ccp / ccp-crypto-aes-cmac.c

/*
 * AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support
 *
 * Copyright (C) 2013 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@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/aes.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>

#include "ccp-crypto.h"


static int ccp_aes_cmac_complete(struct crypto_async_request *async_req,
				 int ret)
{
	struct ahash_request *req = ahash_request_cast(async_req);
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	unsigned int digest_size = crypto_ahash_digestsize(tfm);

	if (ret)
		goto e_free;

	if (rctx->hash_rem) {
		/* Save remaining data to buffer */
		scatterwalk_map_and_copy(rctx->buf, rctx->cmd.u.aes.src,
					 rctx->hash_cnt, rctx->hash_rem, 0);
		rctx->buf_count = rctx->hash_rem;
	} else
		rctx->buf_count = 0;

	memcpy(req->result, rctx->iv, digest_size);

e_free:
	sg_free_table(&rctx->data_sg);

	return ret;
}

static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes,
			      unsigned int final)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	struct scatterlist *sg, *cmac_key_sg = NULL;
	unsigned int block_size =
		crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
	unsigned int len, need_pad, sg_count;
	int ret;

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

	if (nbytes)
		rctx->null_msg = 0;

	if (!final && ((nbytes + rctx->buf_count) <= block_size)) {
		scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
					 0, nbytes, 0);
		rctx->buf_count += nbytes;

		return 0;
	}

	len = rctx->buf_count + nbytes;

	rctx->final = final;
	rctx->hash_cnt = final ? len : len & ~(block_size - 1);
	rctx->hash_rem = final ?   0 : len &  (block_size - 1);
	if (!final && (rctx->hash_cnt == len)) {
		/* CCP can't do zero length final, so keep some data around */
		rctx->hash_cnt -= block_size;
		rctx->hash_rem = block_size;
	}

	if (final && (rctx->null_msg || (len & (block_size - 1))))
		need_pad = 1;
	else
		need_pad = 0;

	sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv));

	/* Build the data scatterlist table - allocate enough entries for all
	 * possible data pieces (buffer, input data, padding)
	 */
	sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
	ret = sg_alloc_table(&rctx->data_sg, sg_count, GFP_KERNEL);
	if (ret)
		return ret;

	sg = NULL;
	if (rctx->buf_count) {
		sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
	}

	if (nbytes)
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);

	if (need_pad) {
		int pad_length = block_size - (len & (block_size - 1));

		rctx->hash_cnt += pad_length;

		memset(rctx->pad, 0, sizeof(rctx->pad));
		rctx->pad[0] = 0x80;
		sg_init_one(&rctx->pad_sg, rctx->pad, pad_length);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
	}
	if (sg)
		sg_mark_end(sg);

	/* Initialize the K1/K2 scatterlist */
	if (final)
		cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg
					 : &ctx->u.aes.k1_sg;

	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	INIT_LIST_HEAD(&rctx->cmd.entry);
	rctx->cmd.engine = CCP_ENGINE_AES;
	rctx->cmd.u.aes.type = ctx->u.aes.type;
	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
	rctx->cmd.u.aes.action = CCP_AES_ACTION_ENCRYPT;
	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
	rctx->cmd.u.aes.iv = &rctx->iv_sg;
	rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE;
	rctx->cmd.u.aes.src = (sg) ? rctx->data_sg.sgl : NULL;
	rctx->cmd.u.aes.src_len = rctx->hash_cnt;
	rctx->cmd.u.aes.dst = NULL;
	rctx->cmd.u.aes.cmac_key = cmac_key_sg;
	rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len;
	rctx->cmd.u.aes.cmac_final = final;

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

	return ret;
}

static int ccp_aes_cmac_init(struct ahash_request *req)
{
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);

	memset(rctx, 0, sizeof(*rctx));

	rctx->null_msg = 1;

	return 0;
}

static int ccp_aes_cmac_update(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, req->nbytes, 0);
}

static int ccp_aes_cmac_final(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, 0, 1);
}

static int ccp_aes_cmac_finup(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, req->nbytes, 1);
}

static int ccp_aes_cmac_digest(struct ahash_request *req)
{
	int ret;

	ret = ccp_aes_cmac_init(req);
	if (ret)
		return ret;

	return ccp_do_cmac_update(req, req->nbytes, 1);
}

static int ccp_aes_cmac_setkey(struct crypto_ahash *tfm, const u8 *key,
			   unsigned int key_len)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
	struct ccp_crypto_ahash_alg *alg =
		ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
	u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo;
	u64 rb_hi = 0x00, rb_lo = 0x87;
	__be64 *gk;
	int ret;

	switch (key_len) {
	case AES_KEYSIZE_128:
		ctx->u.aes.type = CCP_AES_TYPE_128;
		break;
	case AES_KEYSIZE_192:
		ctx->u.aes.type = CCP_AES_TYPE_192;
		break;
	case AES_KEYSIZE_256:
		ctx->u.aes.type = CCP_AES_TYPE_256;
		break;
	default:
		crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	ctx->u.aes.mode = alg->mode;

	/* Set to zero until complete */
	ctx->u.aes.key_len = 0;

	/* Set the key for the AES cipher used to generate the keys */
	ret = crypto_cipher_setkey(ctx->u.aes.tfm_cipher, key, key_len);
	if (ret)
		return ret;

	/* Encrypt a block of zeroes - use key area in context */
	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
	crypto_cipher_encrypt_one(ctx->u.aes.tfm_cipher, ctx->u.aes.key,
				  ctx->u.aes.key);

	/* Generate K1 and K2 */
	k0_hi = be64_to_cpu(*((__be64 *)ctx->u.aes.key));
	k0_lo = be64_to_cpu(*((__be64 *)ctx->u.aes.key + 1));

	k1_hi = (k0_hi << 1) | (k0_lo >> 63);
	k1_lo = k0_lo << 1;
	if (ctx->u.aes.key[0] & 0x80) {
		k1_hi ^= rb_hi;
		k1_lo ^= rb_lo;
	}
	gk = (__be64 *)ctx->u.aes.k1;
	*gk = cpu_to_be64(k1_hi);
	gk++;
	*gk = cpu_to_be64(k1_lo);

	k2_hi = (k1_hi << 1) | (k1_lo >> 63);
	k2_lo = k1_lo << 1;
	if (ctx->u.aes.k1[0] & 0x80) {
		k2_hi ^= rb_hi;
		k2_lo ^= rb_lo;
	}
	gk = (__be64 *)ctx->u.aes.k2;
	*gk = cpu_to_be64(k2_hi);
	gk++;
	*gk = cpu_to_be64(k2_lo);

	ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1);
	sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1));
	sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2));

	/* Save the supplied key */
	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
	memcpy(ctx->u.aes.key, key, key_len);
	ctx->u.aes.key_len = key_len;
	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);

	return ret;
}

static int ccp_aes_cmac_cra_init(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	struct crypto_cipher *cipher_tfm;

	ctx->complete = ccp_aes_cmac_complete;
	ctx->u.aes.key_len = 0;

	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx));

	cipher_tfm = crypto_alloc_cipher("aes", 0,
			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(cipher_tfm)) {
		pr_warn("could not load aes cipher driver\n");
		return PTR_ERR(cipher_tfm);
	}
	ctx->u.aes.tfm_cipher = cipher_tfm;

	return 0;
}

static void ccp_aes_cmac_cra_exit(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);

	if (ctx->u.aes.tfm_cipher)
		crypto_free_cipher(ctx->u.aes.tfm_cipher);
	ctx->u.aes.tfm_cipher = NULL;
}

int ccp_register_aes_cmac_algs(struct list_head *head)
{
	struct ccp_crypto_ahash_alg *ccp_alg;
	struct ahash_alg *alg;
	struct hash_alg_common *halg;
	struct crypto_alg *base;
	int ret;

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

	INIT_LIST_HEAD(&ccp_alg->entry);
	ccp_alg->mode = CCP_AES_MODE_CMAC;

	alg = &ccp_alg->alg;
	alg->init = ccp_aes_cmac_init;
	alg->update = ccp_aes_cmac_update;
	alg->final = ccp_aes_cmac_final;
	alg->finup = ccp_aes_cmac_finup;
	alg->digest = ccp_aes_cmac_digest;
	alg->setkey = ccp_aes_cmac_setkey;

	halg = &alg->halg;
	halg->digestsize = AES_BLOCK_SIZE;

	base = &halg->base;
	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");
	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp");
	base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
			  CRYPTO_ALG_KERN_DRIVER_ONLY |
			  CRYPTO_ALG_NEED_FALLBACK;
	base->cra_blocksize = AES_BLOCK_SIZE;
	base->cra_ctxsize = sizeof(struct ccp_ctx);
	base->cra_priority = CCP_CRA_PRIORITY;
	base->cra_type = &crypto_ahash_type;
	base->cra_init = ccp_aes_cmac_cra_init;
	base->cra_exit = ccp_aes_cmac_cra_exit;
	base->cra_module = THIS_MODULE;

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

	list_add(&ccp_alg->entry, head);

	return 0;
}
Commit	Line	Data
7c185371 TL	1	/*
	2	* AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support
	3	*
	4	* Copyright (C) 2013 Advanced Micro Devices, Inc.
	5	*
	6	* Author: Tom Lendacky <thomas.lendacky@amd.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/sched.h>
	15	#include <linux/delay.h>
	16	#include <linux/scatterlist.h>
	17	#include <linux/crypto.h>
	18	#include <crypto/algapi.h>
	19	#include <crypto/aes.h>
	20	#include <crypto/hash.h>
	21	#include <crypto/internal/hash.h>
	22	#include <crypto/scatterwalk.h>
	23
	24	#include "ccp-crypto.h"
	25
	26
	27	static int ccp_aes_cmac_complete(struct crypto_async_request *async_req,
	28	int ret)
	29	{
	30	struct ahash_request *req = ahash_request_cast(async_req);
	31	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	32	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	33	unsigned int digest_size = crypto_ahash_digestsize(tfm);
	34
	35	if (ret)
	36	goto e_free;
	37
	38	if (rctx->hash_rem) {
	39	/* Save remaining data to buffer */
	40	scatterwalk_map_and_copy(rctx->buf, rctx->cmd.u.aes.src,
	41	rctx->hash_cnt, rctx->hash_rem, 0);
	42	rctx->buf_count = rctx->hash_rem;
	43	} else
	44	rctx->buf_count = 0;
	45
	46	memcpy(req->result, rctx->iv, digest_size);
	47
	48	e_free:
	49	sg_free_table(&rctx->data_sg);
	50
	51	return ret;
	52	}
	53
	54	static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes,
	55	unsigned int final)
	56	{
	57	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	58	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
	59	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	60	struct scatterlist sg, cmac_key_sg = NULL;
	61	unsigned int block_size =
	62	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
	63	unsigned int len, need_pad, sg_count;
	64	int ret;
65
369f3dab	66	if (!ctx->u.aes.key_len)
7c185371	67	return -EINVAL;
7c185371 TL	68
	69	if (nbytes)
	70	rctx->null_msg = 0;
	71
	72	if (!final && ((nbytes + rctx->buf_count) <= block_size)) {
	73	scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
	74	0, nbytes, 0);
	75	rctx->buf_count += nbytes;
	76
	77	return 0;
	78	}
	79
	80	len = rctx->buf_count + nbytes;
	81
	82	rctx->final = final;
	83	rctx->hash_cnt = final ? len : len & ~(block_size - 1);
	84	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	85	if (!final && (rctx->hash_cnt == len)) {
	86	/* CCP can't do zero length final, so keep some data around */
	87	rctx->hash_cnt -= block_size;
	88	rctx->hash_rem = block_size;
	89	}
	90
	91	if (final && (rctx->null_msg \|\| (len & (block_size - 1))))
	92	need_pad = 1;
	93	else
	94	need_pad = 0;
	95
	96	sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv));
	97
	98	/* Build the data scatterlist table - allocate enough entries for all
	99	* possible data pieces (buffer, input data, padding)
	100	*/
	101	sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
	102	ret = sg_alloc_table(&rctx->data_sg, sg_count, GFP_KERNEL);
	103	if (ret)
	104	return ret;
	105
	106	sg = NULL;
	107	if (rctx->buf_count) {
	108	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
	109	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
	110	}
	111
	112	if (nbytes)
	113	sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
	114
	115	if (need_pad) {
	116	int pad_length = block_size - (len & (block_size - 1));
	117
	118	rctx->hash_cnt += pad_length;
	119
	120	memset(rctx->pad, 0, sizeof(rctx->pad));
	121	rctx->pad[0] = 0x80;
	122	sg_init_one(&rctx->pad_sg, rctx->pad, pad_length);
	123	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
	124	}
	125	if (sg)
	126	sg_mark_end(sg);
	127
	128	/* Initialize the K1/K2 scatterlist */
	129	if (final)
	130	cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg
	131	: &ctx->u.aes.k1_sg;
132
133	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
134	INIT_LIST_HEAD(&rctx->cmd.entry);
135	rctx->cmd.engine = CCP_ENGINE_AES;
136	rctx->cmd.u.aes.type = ctx->u.aes.type;
137	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
138	rctx->cmd.u.aes.action = CCP_AES_ACTION_ENCRYPT;
139	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
140	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
141	rctx->cmd.u.aes.iv = &rctx->iv_sg;
142	rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE;
143	rctx->cmd.u.aes.src = (sg) ? rctx->data_sg.sgl : NULL;
144	rctx->cmd.u.aes.src_len = rctx->hash_cnt;
145	rctx->cmd.u.aes.dst = NULL;
146	rctx->cmd.u.aes.cmac_key = cmac_key_sg;
147	rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len;
148	rctx->cmd.u.aes.cmac_final = final;
149
150	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
151
152	return ret;
153	}
154
155	static int ccp_aes_cmac_init(struct ahash_request *req)
156	{
157	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
158
159	memset(rctx, 0, sizeof(*rctx));
160
161	rctx->null_msg = 1;
162
163	return 0;
164	}
165
166	static int ccp_aes_cmac_update(struct ahash_request *req)
167	{
168	return ccp_do_cmac_update(req, req->nbytes, 0);
169	}
170
171	static int ccp_aes_cmac_final(struct ahash_request *req)
172	{
173	return ccp_do_cmac_update(req, 0, 1);
174	}
175
176	static int ccp_aes_cmac_finup(struct ahash_request *req)
177	{
178	return ccp_do_cmac_update(req, req->nbytes, 1);
179	}
180
181	static int ccp_aes_cmac_digest(struct ahash_request *req)
182	{
183	int ret;
184
185	ret = ccp_aes_cmac_init(req);
186	if (ret)
187	return ret;
188
189	return ccp_do_cmac_update(req, req->nbytes, 1);
190	}
191
192	static int ccp_aes_cmac_setkey(struct crypto_ahash tfm, const u8 key,
193	unsigned int key_len)
194	{
195	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
196	struct ccp_crypto_ahash_alg *alg =
197	ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
198	u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo;
199	u64 rb_hi = 0x00, rb_lo = 0x87;
200	__be64 *gk;
201	int ret;
202
203	switch (key_len) {
204	case AES_KEYSIZE_128:
205	ctx->u.aes.type = CCP_AES_TYPE_128;
206	break;
207	case AES_KEYSIZE_192:
208	ctx->u.aes.type = CCP_AES_TYPE_192;
209	break;
210	case AES_KEYSIZE_256:
211	ctx->u.aes.type = CCP_AES_TYPE_256;
212	break;
213	default:
214	crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
215	return -EINVAL;
216	}
217	ctx->u.aes.mode = alg->mode;
218
219	/* Set to zero until complete */
220	ctx->u.aes.key_len = 0;
221
222	/* Set the key for the AES cipher used to generate the keys */
223	ret = crypto_cipher_setkey(ctx->u.aes.tfm_cipher, key, key_len);
224	if (ret)
225	return ret;
226
227	/* Encrypt a block of zeroes - use key area in context */
228	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
229	crypto_cipher_encrypt_one(ctx->u.aes.tfm_cipher, ctx->u.aes.key,
230	ctx->u.aes.key);
231
232	/* Generate K1 and K2 */
233	k0_hi = be64_to_cpu(((__be64 )ctx->u.aes.key));
234	k0_lo = be64_to_cpu(((__be64 )ctx->u.aes.key + 1));
235
236	k1_hi = (k0_hi << 1) \| (k0_lo >> 63);
237	k1_lo = k0_lo << 1;
238	if (ctx->u.aes.key[0] & 0x80) {
239	k1_hi ^= rb_hi;
240	k1_lo ^= rb_lo;
241	}
242	gk = (__be64 *)ctx->u.aes.k1;
243	*gk = cpu_to_be64(k1_hi);
244	gk++;
245	*gk = cpu_to_be64(k1_lo);
246
247	k2_hi = (k1_hi << 1) \| (k1_lo >> 63);
248	k2_lo = k1_lo << 1;
249	if (ctx->u.aes.k1[0] & 0x80) {
250	k2_hi ^= rb_hi;
251	k2_lo ^= rb_lo;
252	}
253	gk = (__be64 *)ctx->u.aes.k2;
254	*gk = cpu_to_be64(k2_hi);
255	gk++;
256	*gk = cpu_to_be64(k2_lo);
257
258	ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1);
259	sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1));
260	sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2));
261
262	/* Save the supplied key */
263	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
264	memcpy(ctx->u.aes.key, key, key_len);
265	ctx->u.aes.key_len = key_len;
266	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
267
268	return ret;
269	}
270
271	static int ccp_aes_cmac_cra_init(struct crypto_tfm *tfm)
272	{
273	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
274	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
275	struct crypto_cipher *cipher_tfm;
276
277	ctx->complete = ccp_aes_cmac_complete;
278	ctx->u.aes.key_len = 0;
279
280	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx));
281
282	cipher_tfm = crypto_alloc_cipher("aes", 0,
283	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
284	if (IS_ERR(cipher_tfm)) {
285	pr_warn("could not load aes cipher driver\n");
286	return PTR_ERR(cipher_tfm);
287	}
288	ctx->u.aes.tfm_cipher = cipher_tfm;
289
290	return 0;
291	}
292
293	static void ccp_aes_cmac_cra_exit(struct crypto_tfm *tfm)
294	{
295	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
296
297	if (ctx->u.aes.tfm_cipher)
298	crypto_free_cipher(ctx->u.aes.tfm_cipher);
299	ctx->u.aes.tfm_cipher = NULL;
300	}
301
302	int ccp_register_aes_cmac_algs(struct list_head *head)
303	{
304	struct ccp_crypto_ahash_alg *ccp_alg;
305	struct ahash_alg *alg;
306	struct hash_alg_common *halg;
307	struct crypto_alg *base;
308	int ret;
309
310	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
311	if (!ccp_alg)
312	return -ENOMEM;
313
314	INIT_LIST_HEAD(&ccp_alg->entry);
315	ccp_alg->mode = CCP_AES_MODE_CMAC;
316
317	alg = &ccp_alg->alg;
318	alg->init = ccp_aes_cmac_init;
319	alg->update = ccp_aes_cmac_update;
320	alg->final = ccp_aes_cmac_final;
321	alg->finup = ccp_aes_cmac_finup;
322	alg->digest = ccp_aes_cmac_digest;
323	alg->setkey = ccp_aes_cmac_setkey;
324
325	halg = &alg->halg;
326	halg->digestsize = AES_BLOCK_SIZE;
327
328	base = &halg->base;
329	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");
330	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp");
331	base->cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC \|
332	CRYPTO_ALG_KERN_DRIVER_ONLY \|
333	CRYPTO_ALG_NEED_FALLBACK;
334	base->cra_blocksize = AES_BLOCK_SIZE;
335	base->cra_ctxsize = sizeof(struct ccp_ctx);
336	base->cra_priority = CCP_CRA_PRIORITY;
337	base->cra_type = &crypto_ahash_type;
338	base->cra_init = ccp_aes_cmac_cra_init;
339	base->cra_exit = ccp_aes_cmac_cra_exit;
340	base->cra_module = THIS_MODULE;
341
342	ret = crypto_register_ahash(alg);
343	if (ret) {
344	pr_err("%s ahash algorithm registration error (%d)\n",
345	base->cra_name, ret);
346	kfree(ccp_alg);
347	return ret;
348	}
349
350	list_add(&ccp_alg->entry, head);
351
352	return 0;
353	}