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Commit 2b789435 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

crypto: ccp - CCP AES crypto API support 



These routines provide crypto API support for AES on the AMD CCP.

Support for AES modes: ECB, CBC, OFB, CFB and CTR

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent d3123599

drivers/crypto/ccp/ccp-crypto-aes.c

0 → 100644
+375 −0
Original line number Diff line number Diff line 
/*

 * AMD Cryptographic Coprocessor (CCP) AES 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/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 ablkcipher_request *req = ablkcipher_request_cast(async_req);

	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);

	struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);



	if (ret)

		return ret;



	if (ctx->u.aes.mode != CCP_AES_MODE_ECB)

		memcpy(req->info, rctx->iv, AES_BLOCK_SIZE);



	return 0;

}



static int ccp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,

			  unsigned int key_len)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));

	struct ccp_crypto_ablkcipher_alg *alg =

		ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(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_ablkcipher_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 ablkcipher_request *req, bool encrypt)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);

	struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);

	struct scatterlist *iv_sg = NULL;

	unsigned int iv_len = 0;

	int ret;



	if (!ctx->u.aes.key_len) {

		pr_err("AES key not set\n");

		return -EINVAL;

	}



	if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||

	     (ctx->u.aes.mode == CCP_AES_MODE_CBC) ||

	     (ctx->u.aes.mode == CCP_AES_MODE_CFB)) &&

	    (req->nbytes & (AES_BLOCK_SIZE - 1))) {

		pr_err("AES request size is not a multiple of the block size\n");

		return -EINVAL;

	}



	if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {

		if (!req->info) {

			pr_err("AES IV not supplied");

			return -EINVAL;

		}



		memcpy(rctx->iv, req->info, 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->nbytes;

	rctx->cmd.u.aes.dst = req->dst;



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



	return ret;

}



static int ccp_aes_encrypt(struct ablkcipher_request *req)

{

	return ccp_aes_crypt(req, true);

}



static int ccp_aes_decrypt(struct ablkcipher_request *req)

{

	return ccp_aes_crypt(req, false);

}



static int ccp_aes_cra_init(struct crypto_tfm *tfm)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);



	ctx->complete = ccp_aes_complete;

	ctx->u.aes.key_len = 0;



	tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);



	return 0;

}



static void ccp_aes_cra_exit(struct crypto_tfm *tfm)

{

}



static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,

				    int ret)

{

	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);

	struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);



	/* Restore the original pointer */

	req->info = rctx->rfc3686_info;



	return ccp_aes_complete(async_req, ret);

}



static int ccp_aes_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,

				  unsigned int key_len)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(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 ablkcipher_request *req, bool encrypt)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);

	struct ccp_aes_req_ctx *rctx = ablkcipher_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->info, CTR_RFC3686_IV_SIZE);



	iv += CTR_RFC3686_IV_SIZE;

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



	/* Point to the new IV */

	rctx->rfc3686_info = req->info;

	req->info = rctx->rfc3686_iv;



	return ccp_aes_crypt(req, encrypt);

}



static int ccp_aes_rfc3686_encrypt(struct ablkcipher_request *req)

{

	return ccp_aes_rfc3686_crypt(req, true);

}



static int ccp_aes_rfc3686_decrypt(struct ablkcipher_request *req)

{

	return ccp_aes_rfc3686_crypt(req, false);

}



static int ccp_aes_rfc3686_cra_init(struct crypto_tfm *tfm)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);



	ctx->complete = ccp_aes_rfc3686_complete;

	ctx->u.aes.key_len = 0;



	tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);



	return 0;

}



static void ccp_aes_rfc3686_cra_exit(struct crypto_tfm *tfm)

{

}



static struct crypto_alg ccp_aes_defaults = {

	.cra_flags	= CRYPTO_ALG_TYPE_ABLKCIPHER |

			  CRYPTO_ALG_ASYNC |

			  CRYPTO_ALG_KERN_DRIVER_ONLY |

			  CRYPTO_ALG_NEED_FALLBACK,

	.cra_blocksize	= AES_BLOCK_SIZE,

	.cra_ctxsize	= sizeof(struct ccp_ctx),

	.cra_priority	= CCP_CRA_PRIORITY,

	.cra_type	= &crypto_ablkcipher_type,

	.cra_init	= ccp_aes_cra_init,

	.cra_exit	= ccp_aes_cra_exit,

	.cra_module	= THIS_MODULE,

	.cra_ablkcipher	= {

		.setkey		= ccp_aes_setkey,

		.encrypt	= ccp_aes_encrypt,

		.decrypt	= ccp_aes_decrypt,

		.min_keysize	= AES_MIN_KEY_SIZE,

		.max_keysize	= AES_MAX_KEY_SIZE,

	},

};



static struct crypto_alg ccp_aes_rfc3686_defaults = {

	.cra_flags	= CRYPTO_ALG_TYPE_ABLKCIPHER |

			   CRYPTO_ALG_ASYNC |

			   CRYPTO_ALG_KERN_DRIVER_ONLY |

			   CRYPTO_ALG_NEED_FALLBACK,

	.cra_blocksize	= CTR_RFC3686_BLOCK_SIZE,

	.cra_ctxsize	= sizeof(struct ccp_ctx),

	.cra_priority	= CCP_CRA_PRIORITY,

	.cra_type	= &crypto_ablkcipher_type,

	.cra_init	= ccp_aes_rfc3686_cra_init,

	.cra_exit	= ccp_aes_rfc3686_cra_exit,

	.cra_module	= THIS_MODULE,

	.cra_ablkcipher	= {

		.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,

	},

};



struct ccp_aes_def {

	enum ccp_aes_mode mode;

	const char *name;

	const char *driver_name;

	unsigned int blocksize;

	unsigned int ivsize;

	struct crypto_alg *alg_defaults;

};



static struct ccp_aes_def aes_algs[] = {

	{

		.mode		= CCP_AES_MODE_ECB,

		.name		= "ecb(aes)",

		.driver_name	= "ecb-aes-ccp",

		.blocksize	= AES_BLOCK_SIZE,

		.ivsize		= 0,

		.alg_defaults	= &ccp_aes_defaults,

	},

	{

		.mode		= CCP_AES_MODE_CBC,

		.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,

		.name		= "cfb(aes)",

		.driver_name	= "cfb-aes-ccp",

		.blocksize	= AES_BLOCK_SIZE,

		.ivsize		= AES_BLOCK_SIZE,

		.alg_defaults	= &ccp_aes_defaults,

	},

	{

		.mode		= CCP_AES_MODE_OFB,

		.name		= "ofb(aes)",

		.driver_name	= "ofb-aes-ccp",

		.blocksize	= 1,

		.ivsize		= AES_BLOCK_SIZE,

		.alg_defaults	= &ccp_aes_defaults,

	},

	{

		.mode		= CCP_AES_MODE_CTR,

		.name		= "ctr(aes)",

		.driver_name	= "ctr-aes-ccp",

		.blocksize	= 1,

		.ivsize		= AES_BLOCK_SIZE,

		.alg_defaults	= &ccp_aes_defaults,

	},

	{

		.mode		= CCP_AES_MODE_CTR,

		.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_ablkcipher_alg *ccp_alg;

	struct crypto_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;

	memcpy(alg, def->alg_defaults, sizeof(*alg));

	snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);

	snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",

		 def->driver_name);

	alg->cra_blocksize = def->blocksize;

	alg->cra_ablkcipher.ivsize = def->ivsize;



	ret = crypto_register_alg(alg);

	if (ret) {

		pr_err("%s ablkcipher algorithm registration error (%d)\n",

			alg->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;



	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {

		ret = ccp_register_aes_alg(head, &aes_algs[i]);

		if (ret)

			return ret;

	}



	return 0;

}