[deliverable/linux.git] / drivers / crypto / ccp / ccp-crypto-sha.c

/*
 * AMD Cryptographic Coprocessor (CCP) SHA 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/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/sha.h>
#include <crypto/scatterwalk.h>

#include "ccp-crypto.h"


static int ccp_sha_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_sha_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 */
		unsigned int offset = rctx->nbytes - rctx->hash_rem;
		scatterwalk_map_and_copy(rctx->buf, rctx->src,
					 offset, rctx->hash_rem, 0);
		rctx->buf_count = rctx->hash_rem;
	} else
		rctx->buf_count = 0;

	/* Update result area if supplied */
	if (req->result)
		memcpy(req->result, rctx->ctx, digest_size);

e_free:
	sg_free_table(&rctx->data_sg);

	return ret;
}

static int ccp_do_sha_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_sha_req_ctx *rctx = ahash_request_ctx(req);
	struct scatterlist *sg;
	unsigned int block_size =
		crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
	unsigned int sg_count;
	gfp_t gfp;
	u64 len;
	int ret;

	len = (u64)rctx->buf_count + (u64)nbytes;

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

		return 0;
	}

	rctx->src = req->src;
	rctx->nbytes = nbytes;

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

	/* Initialize the context scatterlist */
	sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));

	sg = NULL;
	if (rctx->buf_count && nbytes) {
		/* Build the data scatterlist table - allocate enough entries
		 * for both data pieces (buffer and input data)
		 */
		gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
			GFP_KERNEL : GFP_ATOMIC;
		sg_count = sg_nents(req->src) + 1;
		ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
		if (ret)
			return ret;

		sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
		sg_mark_end(sg);

		sg = rctx->data_sg.sgl;
	} else if (rctx->buf_count) {
		sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);

		sg = &rctx->buf_sg;
	} else if (nbytes) {
		sg = req->src;
	}

	rctx->msg_bits += (rctx->hash_cnt << 3);	/* Total in bits */

	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	INIT_LIST_HEAD(&rctx->cmd.entry);
	rctx->cmd.engine = CCP_ENGINE_SHA;
	rctx->cmd.u.sha.type = rctx->type;
	rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
	rctx->cmd.u.sha.ctx_len = sizeof(rctx->ctx);
	rctx->cmd.u.sha.src = sg;
	rctx->cmd.u.sha.src_len = rctx->hash_cnt;
	rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
		&ctx->u.sha.opad_sg : NULL;
	rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
		ctx->u.sha.opad_count : 0;
	rctx->cmd.u.sha.first = rctx->first;
	rctx->cmd.u.sha.final = rctx->final;
	rctx->cmd.u.sha.msg_bits = rctx->msg_bits;

	rctx->first = 0;

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

	return ret;
}

static int ccp_sha_init(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	struct ccp_crypto_ahash_alg *alg =
		ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
	unsigned int block_size =
		crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));

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

	rctx->type = alg->type;
	rctx->first = 1;

	if (ctx->u.sha.key_len) {
		/* Buffer the HMAC key for first update */
		memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
		rctx->buf_count = block_size;
	}

	return 0;
}

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

static int ccp_sha_final(struct ahash_request *req)
{
	return ccp_do_sha_update(req, 0, 1);
}

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

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

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

	return ccp_sha_finup(req);
}

static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,
			  unsigned int key_len)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
	struct crypto_shash *shash = ctx->u.sha.hmac_tfm;

	SHASH_DESC_ON_STACK(sdesc, shash);

	unsigned int block_size = crypto_shash_blocksize(shash);
	unsigned int digest_size = crypto_shash_digestsize(shash);
	int i, ret;

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

	/* Clear key area to provide zero padding for keys smaller
	 * than the block size
	 */
	memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));

	if (key_len > block_size) {
		/* Must hash the input key */
		sdesc->tfm = shash;
		sdesc->flags = crypto_ahash_get_flags(tfm) &
			CRYPTO_TFM_REQ_MAY_SLEEP;

		ret = crypto_shash_digest(sdesc, key, key_len,
					  ctx->u.sha.key);
		if (ret) {
			crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
			return -EINVAL;
		}

		key_len = digest_size;
	} else
		memcpy(ctx->u.sha.key, key, key_len);

	for (i = 0; i < block_size; i++) {
		ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
		ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
	}

	sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
	ctx->u.sha.opad_count = block_size;

	ctx->u.sha.key_len = key_len;

	return 0;
}

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

	ctx->complete = ccp_sha_complete;
	ctx->u.sha.key_len = 0;

	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));

	return 0;
}

static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
{
}

static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
	struct crypto_shash *hmac_tfm;

	hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
	if (IS_ERR(hmac_tfm)) {
		pr_warn("could not load driver %s need for HMAC support\n",
			alg->child_alg);
		return PTR_ERR(hmac_tfm);
	}

	ctx->u.sha.hmac_tfm = hmac_tfm;

	return ccp_sha_cra_init(tfm);
}

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

	if (ctx->u.sha.hmac_tfm)
		crypto_free_shash(ctx->u.sha.hmac_tfm);

	ccp_sha_cra_exit(tfm);
}

struct ccp_sha_def {
	const char *name;
	const char *drv_name;
	enum ccp_sha_type type;
	u32 digest_size;
	u32 block_size;
};

static struct ccp_sha_def sha_algs[] = {
	{
		.name		= "sha1",
		.drv_name	= "sha1-ccp",
		.type		= CCP_SHA_TYPE_1,
		.digest_size	= SHA1_DIGEST_SIZE,
		.block_size	= SHA1_BLOCK_SIZE,
	},
	{
		.name		= "sha224",
		.drv_name	= "sha224-ccp",
		.type		= CCP_SHA_TYPE_224,
		.digest_size	= SHA224_DIGEST_SIZE,
		.block_size	= SHA224_BLOCK_SIZE,
	},
	{
		.name		= "sha256",
		.drv_name	= "sha256-ccp",
		.type		= CCP_SHA_TYPE_256,
		.digest_size	= SHA256_DIGEST_SIZE,
		.block_size	= SHA256_BLOCK_SIZE,
	},
};

static int ccp_register_hmac_alg(struct list_head *head,
				 const struct ccp_sha_def *def,
				 const struct ccp_crypto_ahash_alg *base_alg)
{
	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;

	/* Copy the base algorithm and only change what's necessary */
	*ccp_alg = *base_alg;
	INIT_LIST_HEAD(&ccp_alg->entry);

	strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);

	alg = &ccp_alg->alg;
	alg->setkey = ccp_sha_setkey;

	halg = &alg->halg;

	base = &halg->base;
	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
		 def->drv_name);
	base->cra_init = ccp_hmac_sha_cra_init;
	base->cra_exit = ccp_hmac_sha_cra_exit;

	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 ret;
}

static int ccp_register_sha_alg(struct list_head *head,
				const struct ccp_sha_def *def)
{
	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->type = def->type;

	alg = &ccp_alg->alg;
	alg->init = ccp_sha_init;
	alg->update = ccp_sha_update;
	alg->final = ccp_sha_final;
	alg->finup = ccp_sha_finup;
	alg->digest = ccp_sha_digest;

	halg = &alg->halg;
	halg->digestsize = def->digest_size;

	base = &halg->base;
	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
		 def->drv_name);
	base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
			  CRYPTO_ALG_KERN_DRIVER_ONLY |
			  CRYPTO_ALG_NEED_FALLBACK;
	base->cra_blocksize = def->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_sha_cra_init;
	base->cra_exit = ccp_sha_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);

	ret = ccp_register_hmac_alg(head, def, ccp_alg);

	return ret;
}

int ccp_register_sha_algs(struct list_head *head)
{
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
		ret = ccp_register_sha_alg(head, &sha_algs[i]);
		if (ret)
			return ret;
	}

	return 0;
}
Commit	Line	Data
0ab0a1d5 TL	1	/*
	2	* AMD Cryptographic Coprocessor (CCP) SHA 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/hash.h>
	20	#include <crypto/internal/hash.h>
	21	#include <crypto/sha.h>
	22	#include <crypto/scatterwalk.h>
	23
	24	#include "ccp-crypto.h"
	25
	26
0ab0a1d5 TL	27	static int ccp_sha_complete(struct crypto_async_request *async_req, int ret)
	28	{
	29	struct ahash_request *req = ahash_request_cast(async_req);
	30	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
0ab0a1d5 TL	31	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	32	unsigned int digest_size = crypto_ahash_digestsize(tfm);
	33
	34	if (ret)
	35	goto e_free;
	36
	37	if (rctx->hash_rem) {
	38	/* Save remaining data to buffer */
81a59f00 TL	39	unsigned int offset = rctx->nbytes - rctx->hash_rem;
	40	scatterwalk_map_and_copy(rctx->buf, rctx->src,
	41	offset, rctx->hash_rem, 0);
0ab0a1d5 TL	42	rctx->buf_count = rctx->hash_rem;
	43	} else
	44	rctx->buf_count = 0;
	45
393897c5 TL	46	/* Update result area if supplied */
	47	if (req->result)
	48	memcpy(req->result, rctx->ctx, digest_size);
0ab0a1d5	49
0ab0a1d5 TL	50	e_free:
	51	sg_free_table(&rctx->data_sg);
	52
	53	return ret;
	54	}
	55
	56	static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,
	57	unsigned int final)
	58	{
	59	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
c11baa02	60	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	61	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	62	struct scatterlist *sg;
	63	unsigned int block_size =
	64	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
81a59f00	65	unsigned int sg_count;
5258de8a	66	gfp_t gfp;
81a59f00	67	u64 len;
0ab0a1d5 TL	68	int ret;
0ab0a1d5 TL	69
81a59f00 TL	70	len = (u64)rctx->buf_count + (u64)nbytes;
	71
	72	if (!final && (len <= block_size)) {
0ab0a1d5 TL	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
81a59f00 TL	80	rctx->src = req->src;
81a59f00 TL	81	rctx->nbytes = nbytes;
0ab0a1d5 TL	82
0ab0a1d5 TL	83	rctx->final = final;
81a59f00 TL	84	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	85	rctx->hash_cnt = len - rctx->hash_rem;
	86	if (!final && !rctx->hash_rem) {
0ab0a1d5 TL	87	/* CCP can't do zero length final, so keep some data around */
	88	rctx->hash_cnt -= block_size;
	89	rctx->hash_rem = block_size;
	90	}
	91
	92	/* Initialize the context scatterlist */
	93	sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));
	94
0ab0a1d5	95	sg = NULL;
77dc4a51 TL	96	if (rctx->buf_count && nbytes) {
	97	/* Build the data scatterlist table - allocate enough entries
	98	* for both data pieces (buffer and input data)
	99	*/
	100	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
	101	GFP_KERNEL : GFP_ATOMIC;
	102	sg_count = sg_nents(req->src) + 1;
	103	ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
	104	if (ret)
	105	return ret;
0ab0a1d5	106
0ab0a1d5 TL	107	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
0ab0a1d5 TL	108	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
0ab0a1d5	109	sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
0ab0a1d5 TL	110	sg_mark_end(sg);
0ab0a1d5 TL	111
77dc4a51 TL	112	sg = rctx->data_sg.sgl;
	113	} else if (rctx->buf_count) {
	114	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
	115
	116	sg = &rctx->buf_sg;
	117	} else if (nbytes) {
	118	sg = req->src;
	119	}
	120
0ab0a1d5 TL	121	rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */
	122
	123	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	124	INIT_LIST_HEAD(&rctx->cmd.entry);
	125	rctx->cmd.engine = CCP_ENGINE_SHA;
	126	rctx->cmd.u.sha.type = rctx->type;
	127	rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
	128	rctx->cmd.u.sha.ctx_len = sizeof(rctx->ctx);
77dc4a51	129	rctx->cmd.u.sha.src = sg;
0ab0a1d5	130	rctx->cmd.u.sha.src_len = rctx->hash_cnt;
c11baa02 TL	131	rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
	132	&ctx->u.sha.opad_sg : NULL;
	133	rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
	134	ctx->u.sha.opad_count : 0;
	135	rctx->cmd.u.sha.first = rctx->first;
0ab0a1d5 TL	136	rctx->cmd.u.sha.final = rctx->final;
	137	rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
	138
	139	rctx->first = 0;
	140
	141	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
	142
	143	return ret;
	144	}
	145
	146	static int ccp_sha_init(struct ahash_request *req)
	147	{
	148	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
77dc4a51	149	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	150	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	151	struct ccp_crypto_ahash_alg *alg =
	152	ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
77dc4a51 TL	153	unsigned int block_size =
77dc4a51 TL	154	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
0ab0a1d5 TL	155
	156	memset(rctx, 0, sizeof(*rctx));
	157
0ab0a1d5 TL	158	rctx->type = alg->type;
	159	rctx->first = 1;
	160
77dc4a51 TL	161	if (ctx->u.sha.key_len) {
	162	/* Buffer the HMAC key for first update */
	163	memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
	164	rctx->buf_count = block_size;
	165	}
	166
0ab0a1d5 TL	167	return 0;
	168	}
	169
	170	static int ccp_sha_update(struct ahash_request *req)
	171	{
	172	return ccp_do_sha_update(req, req->nbytes, 0);
	173	}
	174
	175	static int ccp_sha_final(struct ahash_request *req)
	176	{
	177	return ccp_do_sha_update(req, 0, 1);
	178	}
	179
	180	static int ccp_sha_finup(struct ahash_request *req)
	181	{
	182	return ccp_do_sha_update(req, req->nbytes, 1);
	183	}
	184
	185	static int ccp_sha_digest(struct ahash_request *req)
	186	{
82d1585b	187	int ret;
0ab0a1d5	188
82d1585b TL	189	ret = ccp_sha_init(req);
	190	if (ret)
	191	return ret;
	192
	193	return ccp_sha_finup(req);
0ab0a1d5 TL	194	}
	195
	196	static int ccp_sha_setkey(struct crypto_ahash tfm, const u8 key,
	197	unsigned int key_len)
	198	{
	199	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
c11baa02	200	struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
61ded524 JSM	201
	202	SHASH_DESC_ON_STACK(sdesc, shash);
	203
c11baa02 TL	204	unsigned int block_size = crypto_shash_blocksize(shash);
c11baa02 TL	205	unsigned int digest_size = crypto_shash_digestsize(shash);
0ab0a1d5 TL	206	int i, ret;
	207
	208	/* Set to zero until complete */
	209	ctx->u.sha.key_len = 0;
	210
	211	/* Clear key area to provide zero padding for keys smaller
	212	* than the block size
	213	*/
	214	memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
	215
	216	if (key_len > block_size) {
	217	/* Must hash the input key */
61ded524 JSM	218	sdesc->tfm = shash;
61ded524 JSM	219	sdesc->flags = crypto_ahash_get_flags(tfm) &
c11baa02 TL	220	CRYPTO_TFM_REQ_MAY_SLEEP;
c11baa02 TL	221
61ded524	222	ret = crypto_shash_digest(sdesc, key, key_len,
c11baa02	223	ctx->u.sha.key);
0ab0a1d5 TL	224	if (ret) {
	225	crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	226	return -EINVAL;
	227	}
	228
	229	key_len = digest_size;
	230	} else
	231	memcpy(ctx->u.sha.key, key, key_len);
	232
	233	for (i = 0; i < block_size; i++) {
	234	ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
	235	ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
	236	}
	237
c11baa02 TL	238	sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
	239	ctx->u.sha.opad_count = block_size;
	240
0ab0a1d5 TL	241	ctx->u.sha.key_len = key_len;
	242
	243	return 0;
	244	}
	245
	246	static int ccp_sha_cra_init(struct crypto_tfm *tfm)
	247	{
	248	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	249	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	250
	251	ctx->complete = ccp_sha_complete;
	252	ctx->u.sha.key_len = 0;
	253
	254	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
	255
	256	return 0;
	257	}
	258
	259	static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
	260	{
	261	}
	262
	263	static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
	264	{
	265	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	266	struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
c11baa02	267	struct crypto_shash *hmac_tfm;
0ab0a1d5	268
c11baa02	269	hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
0ab0a1d5 TL	270	if (IS_ERR(hmac_tfm)) {
	271	pr_warn("could not load driver %s need for HMAC support\n",
	272	alg->child_alg);
	273	return PTR_ERR(hmac_tfm);
	274	}
	275
	276	ctx->u.sha.hmac_tfm = hmac_tfm;
	277
	278	return ccp_sha_cra_init(tfm);
	279	}
	280
	281	static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
	282	{
	283	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	284
	285	if (ctx->u.sha.hmac_tfm)
c11baa02	286	crypto_free_shash(ctx->u.sha.hmac_tfm);
0ab0a1d5 TL	287
	288	ccp_sha_cra_exit(tfm);
	289	}
	290
0ab0a1d5 TL	291	struct ccp_sha_def {
	292	const char *name;
	293	const char *drv_name;
0ab0a1d5 TL	294	enum ccp_sha_type type;
	295	u32 digest_size;
	296	u32 block_size;
	297	};
	298
	299	static struct ccp_sha_def sha_algs[] = {
	300	{
	301	.name = "sha1",
	302	.drv_name = "sha1-ccp",
0ab0a1d5 TL	303	.type = CCP_SHA_TYPE_1,
	304	.digest_size = SHA1_DIGEST_SIZE,
	305	.block_size = SHA1_BLOCK_SIZE,
	306	},
	307	{
	308	.name = "sha224",
	309	.drv_name = "sha224-ccp",
0ab0a1d5 TL	310	.type = CCP_SHA_TYPE_224,
	311	.digest_size = SHA224_DIGEST_SIZE,
	312	.block_size = SHA224_BLOCK_SIZE,
	313	},
	314	{
	315	.name = "sha256",
	316	.drv_name = "sha256-ccp",
0ab0a1d5 TL	317	.type = CCP_SHA_TYPE_256,
	318	.digest_size = SHA256_DIGEST_SIZE,
	319	.block_size = SHA256_BLOCK_SIZE,
	320	},
	321	};
	322
	323	static int ccp_register_hmac_alg(struct list_head *head,
	324	const struct ccp_sha_def *def,
	325	const struct ccp_crypto_ahash_alg *base_alg)
	326	{
	327	struct ccp_crypto_ahash_alg *ccp_alg;
	328	struct ahash_alg *alg;
	329	struct hash_alg_common *halg;
	330	struct crypto_alg *base;
	331	int ret;
	332
	333	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	334	if (!ccp_alg)
	335	return -ENOMEM;
	336
	337	/* Copy the base algorithm and only change what's necessary */
d1dd206c	338	ccp_alg = base_alg;
0ab0a1d5 TL	339	INIT_LIST_HEAD(&ccp_alg->entry);
	340
	341	strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
	342
	343	alg = &ccp_alg->alg;
	344	alg->setkey = ccp_sha_setkey;
	345
	346	halg = &alg->halg;
	347
	348	base = &halg->base;
	349	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
	350	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
	351	def->drv_name);
	352	base->cra_init = ccp_hmac_sha_cra_init;
	353	base->cra_exit = ccp_hmac_sha_cra_exit;
	354
	355	ret = crypto_register_ahash(alg);
	356	if (ret) {
	357	pr_err("%s ahash algorithm registration error (%d)\n",
	358	base->cra_name, ret);
	359	kfree(ccp_alg);
	360	return ret;
	361	}
	362
	363	list_add(&ccp_alg->entry, head);
	364
	365	return ret;
	366	}
	367
	368	static int ccp_register_sha_alg(struct list_head *head,
	369	const struct ccp_sha_def *def)
	370	{
	371	struct ccp_crypto_ahash_alg *ccp_alg;
	372	struct ahash_alg *alg;
	373	struct hash_alg_common *halg;
	374	struct crypto_alg *base;
	375	int ret;
	376
	377	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	378	if (!ccp_alg)
	379	return -ENOMEM;
	380
	381	INIT_LIST_HEAD(&ccp_alg->entry);
	382
0ab0a1d5 TL	383	ccp_alg->type = def->type;
	384
	385	alg = &ccp_alg->alg;
	386	alg->init = ccp_sha_init;
	387	alg->update = ccp_sha_update;
	388	alg->final = ccp_sha_final;
	389	alg->finup = ccp_sha_finup;
	390	alg->digest = ccp_sha_digest;
	391
	392	halg = &alg->halg;
	393	halg->digestsize = def->digest_size;
	394
	395	base = &halg->base;
	396	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	397	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
	398	def->drv_name);
	399	base->cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC \|
	400	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	401	CRYPTO_ALG_NEED_FALLBACK;
	402	base->cra_blocksize = def->block_size;
	403	base->cra_ctxsize = sizeof(struct ccp_ctx);
	404	base->cra_priority = CCP_CRA_PRIORITY;
	405	base->cra_type = &crypto_ahash_type;
	406	base->cra_init = ccp_sha_cra_init;
	407	base->cra_exit = ccp_sha_cra_exit;
	408	base->cra_module = THIS_MODULE;
	409
	410	ret = crypto_register_ahash(alg);
	411	if (ret) {
	412	pr_err("%s ahash algorithm registration error (%d)\n",
	413	base->cra_name, ret);
	414	kfree(ccp_alg);
	415	return ret;
	416	}
	417
	418	list_add(&ccp_alg->entry, head);
	419
	420	ret = ccp_register_hmac_alg(head, def, ccp_alg);
	421
	422	return ret;
	423	}
	424
	425	int ccp_register_sha_algs(struct list_head *head)
	426	{
	427	int i, ret;
	428
	429	for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
	430	ret = ccp_register_sha_alg(head, &sha_algs[i]);
	431	if (ret)
	432	return ret;
	433	}
	434
	435	return 0;
	436	}