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