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

/*
 * AMD Cryptographic Coprocessor (CCP) SHA crypto API support
 *
 * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 * Author: Gary R Hook <gary.hook@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;

	switch (rctx->type) {
	case CCP_SHA_TYPE_1:
		rctx->cmd.u.sha.ctx_len = SHA1_DIGEST_SIZE;
		break;
	case CCP_SHA_TYPE_224:
		rctx->cmd.u.sha.ctx_len = SHA224_DIGEST_SIZE;
		break;
	case CCP_SHA_TYPE_256:
		rctx->cmd.u.sha.ctx_len = SHA256_DIGEST_SIZE;
		break;
	default:
		/* Should never get here */
		break;
	}

	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_export(struct ahash_request *req, void *out)
{
	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	struct ccp_sha_exp_ctx state;

	/* Don't let anything leak to 'out' */
	memset(&state, 0, sizeof(state));

	state.type = rctx->type;
	state.msg_bits = rctx->msg_bits;
	state.first = rctx->first;
	memcpy(state.ctx, rctx->ctx, sizeof(state.ctx));
	state.buf_count = rctx->buf_count;
	memcpy(state.buf, rctx->buf, sizeof(state.buf));

	/* 'out' may not be aligned so memcpy from local variable */
	memcpy(out, &state, sizeof(state));

	return 0;
}

static int ccp_sha_import(struct ahash_request *req, const void *in)
{
	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	struct ccp_sha_exp_ctx state;

	/* 'in' may not be aligned so memcpy to local variable */
	memcpy(&state, in, sizeof(state));

	memset(rctx, 0, sizeof(*rctx));
	rctx->type = state.type;
	rctx->msg_bits = state.msg_bits;
	rctx->first = state.first;
	memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx));
	rctx->buf_count = state.buf_count;
	memcpy(rctx->buf, state.buf, sizeof(rctx->buf));

	return 0;
}

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 {
	unsigned int version;
	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[] = {
	{
		.version	= CCP_VERSION(3, 0),
		.name		= "sha1",
		.drv_name	= "sha1-ccp",
		.type		= CCP_SHA_TYPE_1,
		.digest_size	= SHA1_DIGEST_SIZE,
		.block_size	= SHA1_BLOCK_SIZE,
	},
	{
		.version	= CCP_VERSION(3, 0),
		.name		= "sha224",
		.drv_name	= "sha224-ccp",
		.type		= CCP_SHA_TYPE_224,
		.digest_size	= SHA224_DIGEST_SIZE,
		.block_size	= SHA224_BLOCK_SIZE,
	},
	{
		.version	= CCP_VERSION(3, 0),
		.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;
	alg->export = ccp_sha_export;
	alg->import = ccp_sha_import;

	halg = &alg->halg;
	halg->digestsize = def->digest_size;
	halg->statesize = sizeof(struct ccp_sha_exp_ctx);

	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;
	unsigned int ccpversion = ccp_version();

	for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
		if (sha_algs[i].version > ccpversion)
			continue;
		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	*
c7019c4d	4	* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
0ab0a1d5 TL	5	*
0ab0a1d5 TL	6	* Author: Tom Lendacky <thomas.lendacky@amd.com>
4b394a23	7	* Author: Gary R Hook <gary.hook@amd.com>
0ab0a1d5 TL	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/sched.h>
	16	#include <linux/delay.h>
	17	#include <linux/scatterlist.h>
	18	#include <linux/crypto.h>
	19	#include <crypto/algapi.h>
	20	#include <crypto/hash.h>
	21	#include <crypto/internal/hash.h>
	22	#include <crypto/sha.h>
	23	#include <crypto/scatterwalk.h>
	24
	25	#include "ccp-crypto.h"
	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	39	unsigned int offset = rctx->nbytes - rctx->hash_rem;
8db88467	40
81a59f00 TL	41	scatterwalk_map_and_copy(rctx->buf, rctx->src,
81a59f00 TL	42	offset, rctx->hash_rem, 0);
0ab0a1d5	43	rctx->buf_count = rctx->hash_rem;
8db88467	44	} else {
0ab0a1d5	45	rctx->buf_count = 0;
8db88467	46	}
0ab0a1d5	47
393897c5 TL	48	/* Update result area if supplied */
	49	if (req->result)
	50	memcpy(req->result, rctx->ctx, digest_size);
0ab0a1d5	51
0ab0a1d5 TL	52	e_free:
	53	sg_free_table(&rctx->data_sg);
	54
	55	return ret;
	56	}
	57
	58	static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,
	59	unsigned int final)
	60	{
	61	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
c11baa02	62	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	63	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	64	struct scatterlist *sg;
	65	unsigned int block_size =
	66	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
81a59f00	67	unsigned int sg_count;
5258de8a	68	gfp_t gfp;
81a59f00	69	u64 len;
0ab0a1d5 TL	70	int ret;
0ab0a1d5 TL	71
81a59f00 TL	72	len = (u64)rctx->buf_count + (u64)nbytes;
	73
	74	if (!final && (len <= block_size)) {
0ab0a1d5 TL	75	scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
	76	0, nbytes, 0);
	77	rctx->buf_count += nbytes;
	78
	79	return 0;
	80	}
	81
81a59f00 TL	82	rctx->src = req->src;
81a59f00 TL	83	rctx->nbytes = nbytes;
0ab0a1d5 TL	84
0ab0a1d5 TL	85	rctx->final = final;
81a59f00 TL	86	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	87	rctx->hash_cnt = len - rctx->hash_rem;
	88	if (!final && !rctx->hash_rem) {
0ab0a1d5 TL	89	/* CCP can't do zero length final, so keep some data around */
	90	rctx->hash_cnt -= block_size;
	91	rctx->hash_rem = block_size;
	92	}
	93
	94	/* Initialize the context scatterlist */
	95	sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));
	96
0ab0a1d5	97	sg = NULL;
77dc4a51 TL	98	if (rctx->buf_count && nbytes) {
	99	/* Build the data scatterlist table - allocate enough entries
	100	* for both data pieces (buffer and input data)
	101	*/
	102	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
	103	GFP_KERNEL : GFP_ATOMIC;
	104	sg_count = sg_nents(req->src) + 1;
	105	ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
	106	if (ret)
	107	return ret;
0ab0a1d5	108
0ab0a1d5 TL	109	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
0ab0a1d5 TL	110	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
355eba5d TL	111	if (!sg) {
	112	ret = -EINVAL;
	113	goto e_free;
	114	}
0ab0a1d5	115	sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
355eba5d TL	116	if (!sg) {
	117	ret = -EINVAL;
	118	goto e_free;
	119	}
0ab0a1d5 TL	120	sg_mark_end(sg);
0ab0a1d5 TL	121
77dc4a51 TL	122	sg = rctx->data_sg.sgl;
	123	} else if (rctx->buf_count) {
	124	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
	125
	126	sg = &rctx->buf_sg;
	127	} else if (nbytes) {
	128	sg = req->src;
	129	}
	130
0ab0a1d5 TL	131	rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */
	132
	133	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	134	INIT_LIST_HEAD(&rctx->cmd.entry);
	135	rctx->cmd.engine = CCP_ENGINE_SHA;
	136	rctx->cmd.u.sha.type = rctx->type;
	137	rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
4b394a23 GH	138
	139	switch (rctx->type) {
	140	case CCP_SHA_TYPE_1:
	141	rctx->cmd.u.sha.ctx_len = SHA1_DIGEST_SIZE;
	142	break;
	143	case CCP_SHA_TYPE_224:
	144	rctx->cmd.u.sha.ctx_len = SHA224_DIGEST_SIZE;
	145	break;
	146	case CCP_SHA_TYPE_256:
	147	rctx->cmd.u.sha.ctx_len = SHA256_DIGEST_SIZE;
	148	break;
	149	default:
	150	/* Should never get here */
	151	break;
	152	}
	153
77dc4a51	154	rctx->cmd.u.sha.src = sg;
0ab0a1d5	155	rctx->cmd.u.sha.src_len = rctx->hash_cnt;
c11baa02 TL	156	rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
	157	&ctx->u.sha.opad_sg : NULL;
	158	rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
	159	ctx->u.sha.opad_count : 0;
	160	rctx->cmd.u.sha.first = rctx->first;
0ab0a1d5 TL	161	rctx->cmd.u.sha.final = rctx->final;
	162	rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
	163
	164	rctx->first = 0;
	165
	166	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
	167
355eba5d TL	168	return ret;
	169
	170	e_free:
	171	sg_free_table(&rctx->data_sg);
	172
0ab0a1d5 TL	173	return ret;
	174	}
	175
	176	static int ccp_sha_init(struct ahash_request *req)
	177	{
	178	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
77dc4a51	179	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
0ab0a1d5 TL	180	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
	181	struct ccp_crypto_ahash_alg *alg =
	182	ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
77dc4a51 TL	183	unsigned int block_size =
77dc4a51 TL	184	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
0ab0a1d5 TL	185
	186	memset(rctx, 0, sizeof(*rctx));
	187
0ab0a1d5 TL	188	rctx->type = alg->type;
	189	rctx->first = 1;
	190
77dc4a51 TL	191	if (ctx->u.sha.key_len) {
	192	/* Buffer the HMAC key for first update */
	193	memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
	194	rctx->buf_count = block_size;
	195	}
	196
0ab0a1d5 TL	197	return 0;
	198	}
	199
	200	static int ccp_sha_update(struct ahash_request *req)
	201	{
	202	return ccp_do_sha_update(req, req->nbytes, 0);
	203	}
	204
	205	static int ccp_sha_final(struct ahash_request *req)
	206	{
	207	return ccp_do_sha_update(req, 0, 1);
	208	}
	209
	210	static int ccp_sha_finup(struct ahash_request *req)
	211	{
	212	return ccp_do_sha_update(req, req->nbytes, 1);
	213	}
	214
	215	static int ccp_sha_digest(struct ahash_request *req)
	216	{
82d1585b	217	int ret;
0ab0a1d5	218
82d1585b TL	219	ret = ccp_sha_init(req);
	220	if (ret)
	221	return ret;
	222
	223	return ccp_sha_finup(req);
0ab0a1d5 TL	224	}
0ab0a1d5 TL	225
952bce97 TL	226	static int ccp_sha_export(struct ahash_request req, void out)
	227	{
	228	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
b31dde2a	229	struct ccp_sha_exp_ctx state;
952bce97	230
f709b45e TL	231	/* Don't let anything leak to 'out' */
	232	memset(&state, 0, sizeof(state));
	233
b31dde2a TL	234	state.type = rctx->type;
	235	state.msg_bits = rctx->msg_bits;
	236	state.first = rctx->first;
	237	memcpy(state.ctx, rctx->ctx, sizeof(state.ctx));
	238	state.buf_count = rctx->buf_count;
	239	memcpy(state.buf, rctx->buf, sizeof(state.buf));
	240
	241	/* 'out' may not be aligned so memcpy from local variable */
	242	memcpy(out, &state, sizeof(state));
952bce97 TL	243
	244	return 0;
	245	}
	246
	247	static int ccp_sha_import(struct ahash_request req, const void in)
	248	{
	249	struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
b31dde2a TL	250	struct ccp_sha_exp_ctx state;
	251
	252	/* 'in' may not be aligned so memcpy to local variable */
	253	memcpy(&state, in, sizeof(state));
	254
ce0ae266	255	memset(rctx, 0, sizeof(*rctx));
b31dde2a TL	256	rctx->type = state.type;
	257	rctx->msg_bits = state.msg_bits;
	258	rctx->first = state.first;
	259	memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx));
	260	rctx->buf_count = state.buf_count;
	261	memcpy(rctx->buf, state.buf, sizeof(rctx->buf));
952bce97 TL	262
	263	return 0;
	264	}
	265
0ab0a1d5 TL	266	static int ccp_sha_setkey(struct crypto_ahash tfm, const u8 key,
	267	unsigned int key_len)
	268	{
	269	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
c11baa02	270	struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
61ded524 JSM	271
	272	SHASH_DESC_ON_STACK(sdesc, shash);
	273
c11baa02 TL	274	unsigned int block_size = crypto_shash_blocksize(shash);
c11baa02 TL	275	unsigned int digest_size = crypto_shash_digestsize(shash);
0ab0a1d5 TL	276	int i, ret;
	277
	278	/* Set to zero until complete */
	279	ctx->u.sha.key_len = 0;
	280
	281	/* Clear key area to provide zero padding for keys smaller
	282	* than the block size
	283	*/
	284	memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
	285
	286	if (key_len > block_size) {
	287	/* Must hash the input key */
61ded524 JSM	288	sdesc->tfm = shash;
61ded524 JSM	289	sdesc->flags = crypto_ahash_get_flags(tfm) &
c11baa02 TL	290	CRYPTO_TFM_REQ_MAY_SLEEP;
c11baa02 TL	291
61ded524	292	ret = crypto_shash_digest(sdesc, key, key_len,
c11baa02	293	ctx->u.sha.key);
0ab0a1d5 TL	294	if (ret) {
	295	crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	296	return -EINVAL;
	297	}
	298
	299	key_len = digest_size;
8db88467	300	} else {
0ab0a1d5	301	memcpy(ctx->u.sha.key, key, key_len);
8db88467	302	}
0ab0a1d5 TL	303
	304	for (i = 0; i < block_size; i++) {
	305	ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
	306	ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
	307	}
	308
c11baa02 TL	309	sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
	310	ctx->u.sha.opad_count = block_size;
	311
0ab0a1d5 TL	312	ctx->u.sha.key_len = key_len;
	313
	314	return 0;
	315	}
	316
	317	static int ccp_sha_cra_init(struct crypto_tfm *tfm)
	318	{
	319	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	320	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	321
	322	ctx->complete = ccp_sha_complete;
	323	ctx->u.sha.key_len = 0;
	324
	325	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
	326
	327	return 0;
	328	}
	329
	330	static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
	331	{
	332	}
	333
	334	static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
	335	{
	336	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	337	struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
c11baa02	338	struct crypto_shash *hmac_tfm;
0ab0a1d5	339
c11baa02	340	hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
0ab0a1d5 TL	341	if (IS_ERR(hmac_tfm)) {
	342	pr_warn("could not load driver %s need for HMAC support\n",
	343	alg->child_alg);
	344	return PTR_ERR(hmac_tfm);
	345	}
	346
	347	ctx->u.sha.hmac_tfm = hmac_tfm;
	348
	349	return ccp_sha_cra_init(tfm);
	350	}
	351
	352	static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
	353	{
	354	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	355
	356	if (ctx->u.sha.hmac_tfm)
c11baa02	357	crypto_free_shash(ctx->u.sha.hmac_tfm);
0ab0a1d5 TL	358
	359	ccp_sha_cra_exit(tfm);
	360	}
	361
0ab0a1d5	362	struct ccp_sha_def {
c7019c4d	363	unsigned int version;
0ab0a1d5 TL	364	const char *name;
0ab0a1d5 TL	365	const char *drv_name;
0ab0a1d5 TL	366	enum ccp_sha_type type;
	367	u32 digest_size;
	368	u32 block_size;
	369	};
	370
	371	static struct ccp_sha_def sha_algs[] = {
	372	{
c7019c4d	373	.version = CCP_VERSION(3, 0),
0ab0a1d5 TL	374	.name = "sha1",
0ab0a1d5 TL	375	.drv_name = "sha1-ccp",
0ab0a1d5 TL	376	.type = CCP_SHA_TYPE_1,
	377	.digest_size = SHA1_DIGEST_SIZE,
	378	.block_size = SHA1_BLOCK_SIZE,
	379	},
	380	{
c7019c4d	381	.version = CCP_VERSION(3, 0),
0ab0a1d5 TL	382	.name = "sha224",
0ab0a1d5 TL	383	.drv_name = "sha224-ccp",
0ab0a1d5 TL	384	.type = CCP_SHA_TYPE_224,
	385	.digest_size = SHA224_DIGEST_SIZE,
	386	.block_size = SHA224_BLOCK_SIZE,
	387	},
	388	{
c7019c4d	389	.version = CCP_VERSION(3, 0),
0ab0a1d5 TL	390	.name = "sha256",
0ab0a1d5 TL	391	.drv_name = "sha256-ccp",
0ab0a1d5 TL	392	.type = CCP_SHA_TYPE_256,
	393	.digest_size = SHA256_DIGEST_SIZE,
	394	.block_size = SHA256_BLOCK_SIZE,
	395	},
	396	};
	397
	398	static int ccp_register_hmac_alg(struct list_head *head,
	399	const struct ccp_sha_def *def,
	400	const struct ccp_crypto_ahash_alg *base_alg)
	401	{
	402	struct ccp_crypto_ahash_alg *ccp_alg;
	403	struct ahash_alg *alg;
	404	struct hash_alg_common *halg;
	405	struct crypto_alg *base;
	406	int ret;
	407
	408	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	409	if (!ccp_alg)
	410	return -ENOMEM;
	411
	412	/* Copy the base algorithm and only change what's necessary */
d1dd206c	413	ccp_alg = base_alg;
0ab0a1d5 TL	414	INIT_LIST_HEAD(&ccp_alg->entry);
	415
	416	strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
	417
	418	alg = &ccp_alg->alg;
	419	alg->setkey = ccp_sha_setkey;
	420
	421	halg = &alg->halg;
	422
	423	base = &halg->base;
	424	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
	425	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
	426	def->drv_name);
	427	base->cra_init = ccp_hmac_sha_cra_init;
	428	base->cra_exit = ccp_hmac_sha_cra_exit;
	429
	430	ret = crypto_register_ahash(alg);
	431	if (ret) {
	432	pr_err("%s ahash algorithm registration error (%d)\n",
8db88467	433	base->cra_name, ret);
0ab0a1d5 TL	434	kfree(ccp_alg);
	435	return ret;
	436	}
	437
	438	list_add(&ccp_alg->entry, head);
	439
	440	return ret;
	441	}
	442
	443	static int ccp_register_sha_alg(struct list_head *head,
	444	const struct ccp_sha_def *def)
	445	{
	446	struct ccp_crypto_ahash_alg *ccp_alg;
	447	struct ahash_alg *alg;
	448	struct hash_alg_common *halg;
	449	struct crypto_alg *base;
	450	int ret;
	451
	452	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	453	if (!ccp_alg)
	454	return -ENOMEM;
	455
	456	INIT_LIST_HEAD(&ccp_alg->entry);
	457
0ab0a1d5 TL	458	ccp_alg->type = def->type;
	459
	460	alg = &ccp_alg->alg;
	461	alg->init = ccp_sha_init;
	462	alg->update = ccp_sha_update;
	463	alg->final = ccp_sha_final;
	464	alg->finup = ccp_sha_finup;
	465	alg->digest = ccp_sha_digest;
952bce97 TL	466	alg->export = ccp_sha_export;
952bce97 TL	467	alg->import = ccp_sha_import;
0ab0a1d5 TL	468
	469	halg = &alg->halg;
	470	halg->digestsize = def->digest_size;
d1662165	471	halg->statesize = sizeof(struct ccp_sha_exp_ctx);
0ab0a1d5 TL	472
	473	base = &halg->base;
	474	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	475	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
	476	def->drv_name);
	477	base->cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC \|
	478	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	479	CRYPTO_ALG_NEED_FALLBACK;
	480	base->cra_blocksize = def->block_size;
	481	base->cra_ctxsize = sizeof(struct ccp_ctx);
	482	base->cra_priority = CCP_CRA_PRIORITY;
	483	base->cra_type = &crypto_ahash_type;
	484	base->cra_init = ccp_sha_cra_init;
	485	base->cra_exit = ccp_sha_cra_exit;
	486	base->cra_module = THIS_MODULE;
	487
	488	ret = crypto_register_ahash(alg);
	489	if (ret) {
	490	pr_err("%s ahash algorithm registration error (%d)\n",
8db88467	491	base->cra_name, ret);
0ab0a1d5 TL	492	kfree(ccp_alg);
	493	return ret;
	494	}
	495
	496	list_add(&ccp_alg->entry, head);
	497
	498	ret = ccp_register_hmac_alg(head, def, ccp_alg);
	499
	500	return ret;
	501	}
	502
	503	int ccp_register_sha_algs(struct list_head *head)
	504	{
	505	int i, ret;
c7019c4d	506	unsigned int ccpversion = ccp_version();
0ab0a1d5 TL	507
0ab0a1d5 TL	508	for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
c7019c4d GH	509	if (sha_algs[i].version > ccpversion)
c7019c4d GH	510	continue;
0ab0a1d5 TL	511	ret = ccp_register_sha_alg(head, &sha_algs[i]);
	512	if (ret)
	513	return ret;
	514	}
	515
	516	return 0;
	517	}