drivers/crypto/ccp/ccp-crypto-aes.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * AMD Cryptographic Coprocessor (CCP) AES crypto API support
  *
  * Copyright (C) 2013-2019 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@amd.com>
  */

 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
 #include <linux/scatterlist.h>
 #include <linux/crypto.h>
 #include <crypto/algapi.h>
 #include <crypto/aes.h>
 #include <crypto/ctr.h>
 #include <crypto/scatterwalk.h>

 #include "ccp-crypto.h"

 static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
 {
 	struct skcipher_request *req = skcipher_request_cast(async_req);
 	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);

 	if (ret)
 		return ret;

 	if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
 		memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE);

 	return 0;
 }

 static int ccp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 			  unsigned int key_len)
 {
 	struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

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

 	memcpy(ctx->u.aes.key, key, key_len);
 	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);

 	return 0;
 }

 static int ccp_aes_crypt(struct skcipher_request *req, bool encrypt)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
 	struct scatterlist *iv_sg = NULL;
 	unsigned int iv_len = 0;
 	int ret;

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

 	if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
 	     (ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
 	    (req->cryptlen & (AES_BLOCK_SIZE - 1)))
 		return -EINVAL;

 	if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
 		if (!req->iv)
 			return -EINVAL;

 		memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE);
 		iv_sg = &rctx->iv_sg;
 		iv_len = AES_BLOCK_SIZE;
 		sg_init_one(iv_sg, rctx->iv, iv_len);
 	}

 	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
 	INIT_LIST_HEAD(&rctx->cmd.entry);
 	rctx->cmd.engine = CCP_ENGINE_AES;
 	rctx->cmd.u.aes.type = ctx->u.aes.type;
 	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
 	rctx->cmd.u.aes.action =
 		(encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
 	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
 	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
 	rctx->cmd.u.aes.iv = iv_sg;
 	rctx->cmd.u.aes.iv_len = iv_len;
 	rctx->cmd.u.aes.src = req->src;
 	rctx->cmd.u.aes.src_len = req->cryptlen;
 	rctx->cmd.u.aes.dst = req->dst;

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

 	return ret;
 }

 static int ccp_aes_encrypt(struct skcipher_request *req)
 {
 	return ccp_aes_crypt(req, true);
 }

 static int ccp_aes_decrypt(struct skcipher_request *req)
 {
 	return ccp_aes_crypt(req, false);
 }

 static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
 {
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

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

 	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));

 	return 0;
 }

 static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
 				    int ret)
 {
 	struct skcipher_request *req = skcipher_request_cast(async_req);
 	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);

 	/* Restore the original pointer */
 	req->iv = rctx->rfc3686_info;

 	return ccp_aes_complete(async_req, ret);
 }

 static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key,
 				  unsigned int key_len)
 {
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

 	if (key_len < CTR_RFC3686_NONCE_SIZE)
 		return -EINVAL;

 	key_len -= CTR_RFC3686_NONCE_SIZE;
 	memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);

 	return ccp_aes_setkey(tfm, key, key_len);
 }

 static int ccp_aes_rfc3686_crypt(struct skcipher_request *req, bool encrypt)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
 	u8 *iv;

 	/* Initialize the CTR block */
 	iv = rctx->rfc3686_iv;
 	memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);

 	iv += CTR_RFC3686_NONCE_SIZE;
 	memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE);

 	iv += CTR_RFC3686_IV_SIZE;
 	*(__be32 *)iv = cpu_to_be32(1);

 	/* Point to the new IV */
 	rctx->rfc3686_info = req->iv;
 	req->iv = rctx->rfc3686_iv;

 	return ccp_aes_crypt(req, encrypt);
 }

 static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
 {
 	return ccp_aes_rfc3686_crypt(req, true);
 }

 static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
 {
 	return ccp_aes_rfc3686_crypt(req, false);
 }

 static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
 {
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

 	ctx->complete = ccp_aes_rfc3686_complete;
 	ctx->u.aes.key_len = 0;

 	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));

 	return 0;
 }

 static const struct skcipher_alg ccp_aes_defaults = {
 	.setkey			= ccp_aes_setkey,
 	.encrypt		= ccp_aes_encrypt,
 	.decrypt		= ccp_aes_decrypt,
 	.min_keysize		= AES_MIN_KEY_SIZE,
 	.max_keysize		= AES_MAX_KEY_SIZE,
 	.init			= ccp_aes_init_tfm,

 	.base.cra_flags		= CRYPTO_ALG_ASYNC |
 				  CRYPTO_ALG_KERN_DRIVER_ONLY |
 				  CRYPTO_ALG_NEED_FALLBACK,
 	.base.cra_blocksize	= AES_BLOCK_SIZE,
 	.base.cra_ctxsize	= sizeof(struct ccp_ctx),
 	.base.cra_priority	= CCP_CRA_PRIORITY,
 	.base.cra_module	= THIS_MODULE,
 };

 static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
 	.setkey			= ccp_aes_rfc3686_setkey,
 	.encrypt		= ccp_aes_rfc3686_encrypt,
 	.decrypt		= ccp_aes_rfc3686_decrypt,
 	.min_keysize		= AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
 	.max_keysize		= AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
 	.init			= ccp_aes_rfc3686_init_tfm,

 	.base.cra_flags		= CRYPTO_ALG_ASYNC |
 				  CRYPTO_ALG_KERN_DRIVER_ONLY |
 				  CRYPTO_ALG_NEED_FALLBACK,
 	.base.cra_blocksize	= CTR_RFC3686_BLOCK_SIZE,
 	.base.cra_ctxsize	= sizeof(struct ccp_ctx),
 	.base.cra_priority	= CCP_CRA_PRIORITY,
 	.base.cra_module	= THIS_MODULE,
 };

 struct ccp_aes_def {
 	enum ccp_aes_mode mode;
 	unsigned int version;
 	const char *name;
 	const char *driver_name;
 	unsigned int blocksize;
 	unsigned int ivsize;
 	const struct skcipher_alg *alg_defaults;
 };

 static struct ccp_aes_def aes_algs[] = {
 	{
 		.mode		= CCP_AES_MODE_ECB,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "ecb(aes)",
 		.driver_name	= "ecb-aes-ccp",
 		.blocksize	= AES_BLOCK_SIZE,
 		.ivsize		= 0,
 		.alg_defaults	= &ccp_aes_defaults,
 	},
 	{
 		.mode		= CCP_AES_MODE_CBC,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "cbc(aes)",
 		.driver_name	= "cbc-aes-ccp",
 		.blocksize	= AES_BLOCK_SIZE,
 		.ivsize		= AES_BLOCK_SIZE,
 		.alg_defaults	= &ccp_aes_defaults,
 	},
 	{
 		.mode		= CCP_AES_MODE_CFB,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "cfb(aes)",
 		.driver_name	= "cfb-aes-ccp",
 		.blocksize	= 1,
 		.ivsize		= AES_BLOCK_SIZE,
 		.alg_defaults	= &ccp_aes_defaults,
 	},
 	{
 		.mode		= CCP_AES_MODE_OFB,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "ofb(aes)",
 		.driver_name	= "ofb-aes-ccp",
 		.blocksize	= 1,
 		.ivsize		= AES_BLOCK_SIZE,
 		.alg_defaults	= &ccp_aes_defaults,
 	},
 	{
 		.mode		= CCP_AES_MODE_CTR,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "ctr(aes)",
 		.driver_name	= "ctr-aes-ccp",
 		.blocksize	= 1,
 		.ivsize		= AES_BLOCK_SIZE,
 		.alg_defaults	= &ccp_aes_defaults,
 	},
 	{
 		.mode		= CCP_AES_MODE_CTR,
 		.version	= CCP_VERSION(3, 0),
 		.name		= "rfc3686(ctr(aes))",
 		.driver_name	= "rfc3686-ctr-aes-ccp",
 		.blocksize	= 1,
 		.ivsize		= CTR_RFC3686_IV_SIZE,
 		.alg_defaults	= &ccp_aes_rfc3686_defaults,
 	},
 };

 static int ccp_register_aes_alg(struct list_head *head,
 				const struct ccp_aes_def *def)
 {
 	struct ccp_crypto_skcipher_alg *ccp_alg;
 	struct skcipher_alg *alg;
 	int ret;

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

 	INIT_LIST_HEAD(&ccp_alg->entry);

 	ccp_alg->mode = def->mode;

 	/* Copy the defaults and override as necessary */
 	alg = &ccp_alg->alg;
 	*alg = *def->alg_defaults;
 	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
 	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
 		 def->driver_name);
 	alg->base.cra_blocksize = def->blocksize;
 	alg->ivsize = def->ivsize;

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

 	list_add(&ccp_alg->entry, head);

 	return 0;
 }

 int ccp_register_aes_algs(struct list_head *head)
 {
 	int i, ret;
 	unsigned int ccpversion = ccp_version();

 	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
 		if (aes_algs[i].version > ccpversion)
 			continue;
 		ret = ccp_register_aes_alg(head, &aes_algs[i]);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* AMD Cryptographic Coprocessor (CCP) AES crypto API support
	*
	* Copyright (C) 2013-2019 Advanced Micro Devices, Inc.
	*
	* Author: Tom Lendacky <thomas.lendacky@amd.com>
	*/

	#include <linux/module.h>
	#include <linux/sched.h>
	#include <linux/delay.h>
	#include <linux/scatterlist.h>
	#include <linux/crypto.h>
	#include <crypto/algapi.h>
	#include <crypto/aes.h>
	#include <crypto/ctr.h>
	#include <crypto/scatterwalk.h>

	#include "ccp-crypto.h"

	static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
	{
	struct skcipher_request *req = skcipher_request_cast(async_req);
	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);

	if (ret)
	return ret;

	if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
	memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE);

	return 0;
	}

	static int ccp_aes_setkey(struct crypto_skcipher tfm, const u8 key,
	unsigned int key_len)
	{
	struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

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

	memcpy(ctx->u.aes.key, key, key_len);
	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);

	return 0;
	}

	static int ccp_aes_crypt(struct skcipher_request *req, bool encrypt)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
	struct scatterlist *iv_sg = NULL;
	unsigned int iv_len = 0;
	int ret;

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

	if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) \|\|
	(ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
	(req->cryptlen & (AES_BLOCK_SIZE - 1)))
	return -EINVAL;

	if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
	if (!req->iv)
	return -EINVAL;

	memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE);
	iv_sg = &rctx->iv_sg;
	iv_len = AES_BLOCK_SIZE;
	sg_init_one(iv_sg, rctx->iv, iv_len);
	}

	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	INIT_LIST_HEAD(&rctx->cmd.entry);
	rctx->cmd.engine = CCP_ENGINE_AES;
	rctx->cmd.u.aes.type = ctx->u.aes.type;
	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
	rctx->cmd.u.aes.action =
	(encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
	rctx->cmd.u.aes.iv = iv_sg;
	rctx->cmd.u.aes.iv_len = iv_len;
	rctx->cmd.u.aes.src = req->src;
	rctx->cmd.u.aes.src_len = req->cryptlen;
	rctx->cmd.u.aes.dst = req->dst;

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

	return ret;
	}

	static int ccp_aes_encrypt(struct skcipher_request *req)
	{
	return ccp_aes_crypt(req, true);
	}

	static int ccp_aes_decrypt(struct skcipher_request *req)
	{
	return ccp_aes_crypt(req, false);
	}

	static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
	{
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

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

	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));

	return 0;
	}

	static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
	int ret)
	{
	struct skcipher_request *req = skcipher_request_cast(async_req);
	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);

	/* Restore the original pointer */
	req->iv = rctx->rfc3686_info;

	return ccp_aes_complete(async_req, ret);
	}

	static int ccp_aes_rfc3686_setkey(struct crypto_skcipher tfm, const u8 key,
	unsigned int key_len)
	{
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

	if (key_len < CTR_RFC3686_NONCE_SIZE)
	return -EINVAL;

	key_len -= CTR_RFC3686_NONCE_SIZE;
	memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);

	return ccp_aes_setkey(tfm, key, key_len);
	}

	static int ccp_aes_rfc3686_crypt(struct skcipher_request *req, bool encrypt)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
	u8 *iv;

	/* Initialize the CTR block */
	iv = rctx->rfc3686_iv;
	memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);

	iv += CTR_RFC3686_NONCE_SIZE;
	memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE);

	iv += CTR_RFC3686_IV_SIZE;
	(__be32 )iv = cpu_to_be32(1);

	/* Point to the new IV */
	rctx->rfc3686_info = req->iv;
	req->iv = rctx->rfc3686_iv;

	return ccp_aes_crypt(req, encrypt);
	}

	static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
	{
	return ccp_aes_rfc3686_crypt(req, true);
	}

	static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
	{
	return ccp_aes_rfc3686_crypt(req, false);
	}

	static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
	{
	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);

	ctx->complete = ccp_aes_rfc3686_complete;
	ctx->u.aes.key_len = 0;

	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));

	return 0;
	}

	static const struct skcipher_alg ccp_aes_defaults = {
	.setkey = ccp_aes_setkey,
	.encrypt = ccp_aes_encrypt,
	.decrypt = ccp_aes_decrypt,
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.init = ccp_aes_init_tfm,

	.base.cra_flags = CRYPTO_ALG_ASYNC \|
	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	CRYPTO_ALG_NEED_FALLBACK,
	.base.cra_blocksize = AES_BLOCK_SIZE,
	.base.cra_ctxsize = sizeof(struct ccp_ctx),
	.base.cra_priority = CCP_CRA_PRIORITY,
	.base.cra_module = THIS_MODULE,
	};

	static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
	.setkey = ccp_aes_rfc3686_setkey,
	.encrypt = ccp_aes_rfc3686_encrypt,
	.decrypt = ccp_aes_rfc3686_decrypt,
	.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
	.init = ccp_aes_rfc3686_init_tfm,

	.base.cra_flags = CRYPTO_ALG_ASYNC \|
	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	CRYPTO_ALG_NEED_FALLBACK,
	.base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
	.base.cra_ctxsize = sizeof(struct ccp_ctx),
	.base.cra_priority = CCP_CRA_PRIORITY,
	.base.cra_module = THIS_MODULE,
	};

	struct ccp_aes_def {
	enum ccp_aes_mode mode;
	unsigned int version;
	const char *name;
	const char *driver_name;
	unsigned int blocksize;
	unsigned int ivsize;
	const struct skcipher_alg *alg_defaults;
	};

	static struct ccp_aes_def aes_algs[] = {
	{
	.mode = CCP_AES_MODE_ECB,
	.version = CCP_VERSION(3, 0),
	.name = "ecb(aes)",
	.driver_name = "ecb-aes-ccp",
	.blocksize = AES_BLOCK_SIZE,
	.ivsize = 0,
	.alg_defaults = &ccp_aes_defaults,
	},
	{
	.mode = CCP_AES_MODE_CBC,
	.version = CCP_VERSION(3, 0),
	.name = "cbc(aes)",
	.driver_name = "cbc-aes-ccp",
	.blocksize = AES_BLOCK_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.alg_defaults = &ccp_aes_defaults,
	},
	{
	.mode = CCP_AES_MODE_CFB,
	.version = CCP_VERSION(3, 0),
	.name = "cfb(aes)",
	.driver_name = "cfb-aes-ccp",
	.blocksize = 1,
	.ivsize = AES_BLOCK_SIZE,
	.alg_defaults = &ccp_aes_defaults,
	},
	{
	.mode = CCP_AES_MODE_OFB,
	.version = CCP_VERSION(3, 0),
	.name = "ofb(aes)",
	.driver_name = "ofb-aes-ccp",
	.blocksize = 1,
	.ivsize = AES_BLOCK_SIZE,
	.alg_defaults = &ccp_aes_defaults,
	},
	{
	.mode = CCP_AES_MODE_CTR,
	.version = CCP_VERSION(3, 0),
	.name = "ctr(aes)",
	.driver_name = "ctr-aes-ccp",
	.blocksize = 1,
	.ivsize = AES_BLOCK_SIZE,
	.alg_defaults = &ccp_aes_defaults,
	},
	{
	.mode = CCP_AES_MODE_CTR,
	.version = CCP_VERSION(3, 0),
	.name = "rfc3686(ctr(aes))",
	.driver_name = "rfc3686-ctr-aes-ccp",
	.blocksize = 1,
	.ivsize = CTR_RFC3686_IV_SIZE,
	.alg_defaults = &ccp_aes_rfc3686_defaults,
	},
	};

	static int ccp_register_aes_alg(struct list_head *head,
	const struct ccp_aes_def *def)
	{
	struct ccp_crypto_skcipher_alg *ccp_alg;
	struct skcipher_alg *alg;
	int ret;

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

	INIT_LIST_HEAD(&ccp_alg->entry);

	ccp_alg->mode = def->mode;

	/* Copy the defaults and override as necessary */
	alg = &ccp_alg->alg;
	alg = def->alg_defaults;
	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
	def->driver_name);
	alg->base.cra_blocksize = def->blocksize;
	alg->ivsize = def->ivsize;

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

	list_add(&ccp_alg->entry, head);

	return 0;
	}

	int ccp_register_aes_algs(struct list_head *head)
	{
	int i, ret;
	unsigned int ccpversion = ccp_version();

	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
	if (aes_algs[i].version > ccpversion)
	continue;
	ret = ccp_register_aes_alg(head, &aes_algs[i]);
	if (ret)
	return ret;
	}

	return 0;
	}