[linux-2.6-block.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);
		if (!sg) {
			ret = -EINVAL;
			goto e_free;
		}
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
		if (!sg) {
			ret = -EINVAL;
			goto e_free;
		}
		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;

e_free:
	sg_free_table(&rctx->data_sg);

	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
0ab0a1d5 TL	26	static int ccp_sha_complete(struct crypto_async_request *async_req, int ret)
	27	{
	28	struct ahash_request *req = ahash_request_cast(async_req);
	29	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
0ab0a1d5 TL	30	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	31	unsigned int digest_size = crypto_ahash_digestsize(tfm);
	32
	33	if (ret)
	34	goto e_free;
	35
	36	if (rctx->hash_rem) {
	37	/* Save remaining data to buffer */
81a59f00	38	unsigned int offset = rctx->nbytes - rctx->hash_rem;
8db88467	39
81a59f00 TL	40	scatterwalk_map_and_copy(rctx->buf, rctx->src,
81a59f00 TL	41	offset, rctx->hash_rem, 0);
0ab0a1d5	42	rctx->buf_count = rctx->hash_rem;
8db88467	43	} else {
0ab0a1d5	44	rctx->buf_count = 0;
8db88467	45	}
0ab0a1d5	46
393897c5 TL	47	/* Update result area if supplied */
	48	if (req->result)
	49	memcpy(req->result, rctx->ctx, digest_size);
0ab0a1d5	50
0ab0a1d5 TL	51	e_free:
	52	sg_free_table(&rctx->data_sg);
	53
	54	return ret;
	55	}
	56
	57	static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,
	58	unsigned int final)
	59	{
	60	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
c11baa02	61	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	62	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	63	struct scatterlist *sg;
	64	unsigned int block_size =
	65	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
81a59f00	66	unsigned int sg_count;
5258de8a	67	gfp_t gfp;
81a59f00	68	u64 len;
0ab0a1d5 TL	69	int ret;
0ab0a1d5 TL	70
81a59f00 TL	71	len = (u64)rctx->buf_count + (u64)nbytes;
	72
	73	if (!final && (len <= block_size)) {
0ab0a1d5 TL	74	scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
	75	0, nbytes, 0);
	76	rctx->buf_count += nbytes;
	77
	78	return 0;
	79	}
	80
81a59f00 TL	81	rctx->src = req->src;
81a59f00 TL	82	rctx->nbytes = nbytes;
0ab0a1d5 TL	83
0ab0a1d5 TL	84	rctx->final = final;
81a59f00 TL	85	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	86	rctx->hash_cnt = len - rctx->hash_rem;
	87	if (!final && !rctx->hash_rem) {
0ab0a1d5 TL	88	/* CCP can't do zero length final, so keep some data around */
	89	rctx->hash_cnt -= block_size;
	90	rctx->hash_rem = block_size;
	91	}
	92
	93	/* Initialize the context scatterlist */
	94	sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));
	95
0ab0a1d5	96	sg = NULL;
77dc4a51 TL	97	if (rctx->buf_count && nbytes) {
	98	/* Build the data scatterlist table - allocate enough entries
	99	* for both data pieces (buffer and input data)
	100	*/
	101	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
	102	GFP_KERNEL : GFP_ATOMIC;
	103	sg_count = sg_nents(req->src) + 1;
	104	ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
	105	if (ret)
	106	return ret;
0ab0a1d5	107
0ab0a1d5 TL	108	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
0ab0a1d5 TL	109	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
355eba5d TL	110	if (!sg) {
	111	ret = -EINVAL;
	112	goto e_free;
	113	}
0ab0a1d5	114	sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
355eba5d TL	115	if (!sg) {
	116	ret = -EINVAL;
	117	goto e_free;
	118	}
0ab0a1d5 TL	119	sg_mark_end(sg);
0ab0a1d5 TL	120
77dc4a51 TL	121	sg = rctx->data_sg.sgl;
	122	} else if (rctx->buf_count) {
	123	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
	124
	125	sg = &rctx->buf_sg;
	126	} else if (nbytes) {
	127	sg = req->src;
	128	}
	129
0ab0a1d5 TL	130	rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */
	131
	132	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	133	INIT_LIST_HEAD(&rctx->cmd.entry);
	134	rctx->cmd.engine = CCP_ENGINE_SHA;
	135	rctx->cmd.u.sha.type = rctx->type;
	136	rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
	137	rctx->cmd.u.sha.ctx_len = sizeof(rctx->ctx);
77dc4a51	138	rctx->cmd.u.sha.src = sg;
0ab0a1d5	139	rctx->cmd.u.sha.src_len = rctx->hash_cnt;
c11baa02 TL	140	rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
	141	&ctx->u.sha.opad_sg : NULL;
	142	rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
	143	ctx->u.sha.opad_count : 0;
	144	rctx->cmd.u.sha.first = rctx->first;
0ab0a1d5 TL	145	rctx->cmd.u.sha.final = rctx->final;
	146	rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
	147
	148	rctx->first = 0;
	149
	150	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
	151
355eba5d TL	152	return ret;
	153
	154	e_free:
	155	sg_free_table(&rctx->data_sg);
	156
0ab0a1d5 TL	157	return ret;
	158	}
	159
	160	static int ccp_sha_init(struct ahash_request *req)
	161	{
	162	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
77dc4a51	163	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	164	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	165	struct ccp_crypto_ahash_alg *alg =
	166	ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
77dc4a51 TL	167	unsigned int block_size =
77dc4a51 TL	168	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
0ab0a1d5 TL	169
	170	memset(rctx, 0, sizeof(*rctx));
	171
0ab0a1d5 TL	172	rctx->type = alg->type;
	173	rctx->first = 1;
	174
77dc4a51 TL	175	if (ctx->u.sha.key_len) {
	176	/* Buffer the HMAC key for first update */
	177	memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
	178	rctx->buf_count = block_size;
	179	}
	180
0ab0a1d5 TL	181	return 0;
	182	}
	183
	184	static int ccp_sha_update(struct ahash_request *req)
	185	{
	186	return ccp_do_sha_update(req, req->nbytes, 0);
	187	}
	188
	189	static int ccp_sha_final(struct ahash_request *req)
	190	{
	191	return ccp_do_sha_update(req, 0, 1);
	192	}
	193
	194	static int ccp_sha_finup(struct ahash_request *req)
	195	{
	196	return ccp_do_sha_update(req, req->nbytes, 1);
	197	}
	198
	199	static int ccp_sha_digest(struct ahash_request *req)
	200	{
82d1585b	201	int ret;
0ab0a1d5	202
82d1585b TL	203	ret = ccp_sha_init(req);
	204	if (ret)
	205	return ret;
	206
	207	return ccp_sha_finup(req);
0ab0a1d5 TL	208	}
	209
	210	static int ccp_sha_setkey(struct crypto_ahash tfm, const u8 key,
	211	unsigned int key_len)
	212	{
	213	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
c11baa02	214	struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
61ded524 JSM	215
	216	SHASH_DESC_ON_STACK(sdesc, shash);
	217
c11baa02 TL	218	unsigned int block_size = crypto_shash_blocksize(shash);
c11baa02 TL	219	unsigned int digest_size = crypto_shash_digestsize(shash);
0ab0a1d5 TL	220	int i, ret;
	221
	222	/* Set to zero until complete */
	223	ctx->u.sha.key_len = 0;
	224
	225	/* Clear key area to provide zero padding for keys smaller
	226	* than the block size
	227	*/
	228	memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
	229
	230	if (key_len > block_size) {
	231	/* Must hash the input key */
61ded524 JSM	232	sdesc->tfm = shash;
61ded524 JSM	233	sdesc->flags = crypto_ahash_get_flags(tfm) &
c11baa02 TL	234	CRYPTO_TFM_REQ_MAY_SLEEP;
c11baa02 TL	235
61ded524	236	ret = crypto_shash_digest(sdesc, key, key_len,
c11baa02	237	ctx->u.sha.key);
0ab0a1d5 TL	238	if (ret) {
	239	crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	240	return -EINVAL;
	241	}
	242
	243	key_len = digest_size;
8db88467	244	} else {
0ab0a1d5	245	memcpy(ctx->u.sha.key, key, key_len);
8db88467	246	}
0ab0a1d5 TL	247
	248	for (i = 0; i < block_size; i++) {
	249	ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
	250	ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
	251	}
	252
c11baa02 TL	253	sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
	254	ctx->u.sha.opad_count = block_size;
	255
0ab0a1d5 TL	256	ctx->u.sha.key_len = key_len;
	257
	258	return 0;
	259	}
	260
	261	static int ccp_sha_cra_init(struct crypto_tfm *tfm)
	262	{
	263	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	264	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	265
	266	ctx->complete = ccp_sha_complete;
	267	ctx->u.sha.key_len = 0;
	268
	269	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
	270
	271	return 0;
	272	}
	273
	274	static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
	275	{
	276	}
	277
	278	static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
	279	{
	280	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	281	struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
c11baa02	282	struct crypto_shash *hmac_tfm;
0ab0a1d5	283
c11baa02	284	hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
0ab0a1d5 TL	285	if (IS_ERR(hmac_tfm)) {
	286	pr_warn("could not load driver %s need for HMAC support\n",
	287	alg->child_alg);
	288	return PTR_ERR(hmac_tfm);
	289	}
	290
	291	ctx->u.sha.hmac_tfm = hmac_tfm;
	292
	293	return ccp_sha_cra_init(tfm);
	294	}
	295
	296	static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
	297	{
	298	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	299
	300	if (ctx->u.sha.hmac_tfm)
c11baa02	301	crypto_free_shash(ctx->u.sha.hmac_tfm);
0ab0a1d5 TL	302
	303	ccp_sha_cra_exit(tfm);
	304	}
	305
0ab0a1d5 TL	306	struct ccp_sha_def {
	307	const char *name;
	308	const char *drv_name;
0ab0a1d5 TL	309	enum ccp_sha_type type;
	310	u32 digest_size;
	311	u32 block_size;
	312	};
	313
	314	static struct ccp_sha_def sha_algs[] = {
	315	{
	316	.name = "sha1",
	317	.drv_name = "sha1-ccp",
0ab0a1d5 TL	318	.type = CCP_SHA_TYPE_1,
	319	.digest_size = SHA1_DIGEST_SIZE,
	320	.block_size = SHA1_BLOCK_SIZE,
	321	},
	322	{
	323	.name = "sha224",
	324	.drv_name = "sha224-ccp",
0ab0a1d5 TL	325	.type = CCP_SHA_TYPE_224,
	326	.digest_size = SHA224_DIGEST_SIZE,
	327	.block_size = SHA224_BLOCK_SIZE,
	328	},
	329	{
	330	.name = "sha256",
	331	.drv_name = "sha256-ccp",
0ab0a1d5 TL	332	.type = CCP_SHA_TYPE_256,
	333	.digest_size = SHA256_DIGEST_SIZE,
	334	.block_size = SHA256_BLOCK_SIZE,
	335	},
	336	};
	337
	338	static int ccp_register_hmac_alg(struct list_head *head,
	339	const struct ccp_sha_def *def,
	340	const struct ccp_crypto_ahash_alg *base_alg)
	341	{
	342	struct ccp_crypto_ahash_alg *ccp_alg;
	343	struct ahash_alg *alg;
	344	struct hash_alg_common *halg;
	345	struct crypto_alg *base;
	346	int ret;
	347
	348	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	349	if (!ccp_alg)
	350	return -ENOMEM;
	351
	352	/* Copy the base algorithm and only change what's necessary */
d1dd206c	353	ccp_alg = base_alg;
0ab0a1d5 TL	354	INIT_LIST_HEAD(&ccp_alg->entry);
	355
	356	strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
	357
	358	alg = &ccp_alg->alg;
	359	alg->setkey = ccp_sha_setkey;
	360
	361	halg = &alg->halg;
	362
	363	base = &halg->base;
	364	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
	365	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
	366	def->drv_name);
	367	base->cra_init = ccp_hmac_sha_cra_init;
	368	base->cra_exit = ccp_hmac_sha_cra_exit;
	369
	370	ret = crypto_register_ahash(alg);
	371	if (ret) {
	372	pr_err("%s ahash algorithm registration error (%d)\n",
8db88467	373	base->cra_name, ret);
0ab0a1d5 TL	374	kfree(ccp_alg);
	375	return ret;
	376	}
	377
	378	list_add(&ccp_alg->entry, head);
	379
	380	return ret;
	381	}
	382
	383	static int ccp_register_sha_alg(struct list_head *head,
	384	const struct ccp_sha_def *def)
	385	{
	386	struct ccp_crypto_ahash_alg *ccp_alg;
	387	struct ahash_alg *alg;
	388	struct hash_alg_common *halg;
	389	struct crypto_alg *base;
	390	int ret;
	391
	392	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	393	if (!ccp_alg)
	394	return -ENOMEM;
	395
	396	INIT_LIST_HEAD(&ccp_alg->entry);
	397
0ab0a1d5 TL	398	ccp_alg->type = def->type;
	399
	400	alg = &ccp_alg->alg;
	401	alg->init = ccp_sha_init;
	402	alg->update = ccp_sha_update;
	403	alg->final = ccp_sha_final;
	404	alg->finup = ccp_sha_finup;
	405	alg->digest = ccp_sha_digest;
	406
	407	halg = &alg->halg;
	408	halg->digestsize = def->digest_size;
	409
	410	base = &halg->base;
	411	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	412	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
	413	def->drv_name);
	414	base->cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC \|
	415	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	416	CRYPTO_ALG_NEED_FALLBACK;
	417	base->cra_blocksize = def->block_size;
	418	base->cra_ctxsize = sizeof(struct ccp_ctx);
	419	base->cra_priority = CCP_CRA_PRIORITY;
	420	base->cra_type = &crypto_ahash_type;
	421	base->cra_init = ccp_sha_cra_init;
	422	base->cra_exit = ccp_sha_cra_exit;
	423	base->cra_module = THIS_MODULE;
	424
	425	ret = crypto_register_ahash(alg);
	426	if (ret) {
	427	pr_err("%s ahash algorithm registration error (%d)\n",
8db88467	428	base->cra_name, ret);
0ab0a1d5 TL	429	kfree(ccp_alg);
	430	return ret;
	431	}
	432
	433	list_add(&ccp_alg->entry, head);
	434
	435	ret = ccp_register_hmac_alg(head, def, ccp_alg);
	436
	437	return ret;
	438	}
	439
	440	int ccp_register_sha_algs(struct list_head *head)
	441	{
	442	int i, ret;
	443
	444	for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
	445	ret = ccp_register_sha_alg(head, &sha_algs[i]);
	446	if (ret)
	447	return ret;
	448	}
	449
	450	return 0;
	451	}