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Commit 990672d4 authored by Gary R Hook's avatar Gary R Hook Committed by Herbert Xu
Browse files

crypto: ccp - Enable 3DES function on v5 CCPs 



Wire up support for Triple DES in ECB mode.

Signed-off-by: default avatarGary R Hook <gary.hook@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ccebcf3f

drivers/crypto/ccp/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,4 +12,5 @@ ccp-crypto-objs := ccp-crypto-main.o \ 
		   ccp-crypto-aes.o \

		   ccp-crypto-aes-cmac.o \

		   ccp-crypto-aes-xts.o \

		   ccp-crypto-des3.o \

		   ccp-crypto-sha.o

drivers/crypto/ccp/ccp-crypto-des3.c

0 → 100644
+254 −0
Original line number Diff line number Diff line 
/*

 * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support

 *

 * Copyright (C) 2016 Advanced Micro Devices, Inc.

 *

 * Author: Gary R Hook <ghook@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/scatterwalk.h>

#include <crypto/des.h>



#include "ccp-crypto.h"



static int ccp_des3_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_des3_req_ctx *rctx = ablkcipher_request_ctx(req);



	if (ret)

		return ret;



	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)

		memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE);



	return 0;

}



static int ccp_des3_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));

	u32 *flags = &tfm->base.crt_flags;





	/* From des_generic.c:

	 *

	 * RFC2451:

	 *   If the first two or last two independent 64-bit keys are

	 *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the

	 *   same as DES.  Implementers MUST reject keys that exhibit this

	 *   property.

	 */

	const u32 *K = (const u32 *)key;



	if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||

		     !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&

		     (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {

		*flags |= CRYPTO_TFM_RES_WEAK_KEY;

		return -EINVAL;

	}



	/* It's not clear that there is any support for a keysize of 112.

	 * If needed, the caller should make K1 == K3

	 */

	ctx->u.des3.type = CCP_DES3_TYPE_168;

	ctx->u.des3.mode = alg->mode;

	ctx->u.des3.key_len = key_len;



	memcpy(ctx->u.des3.key, key, key_len);

	sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);



	return 0;

}



static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt)

{

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

	struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);

	struct scatterlist *iv_sg = NULL;

	unsigned int iv_len = 0;

	int ret;



	if (!ctx->u.des3.key_len)

		return -EINVAL;



	if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||

	     (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&

	    (req->nbytes & (DES3_EDE_BLOCK_SIZE - 1)))

		return -EINVAL;



	if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {

		if (!req->info)

			return -EINVAL;



		memcpy(rctx->iv, req->info, DES3_EDE_BLOCK_SIZE);

		iv_sg = &rctx->iv_sg;

		iv_len = DES3_EDE_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_DES3;

	rctx->cmd.u.des3.type = ctx->u.des3.type;

	rctx->cmd.u.des3.mode = ctx->u.des3.mode;

	rctx->cmd.u.des3.action = (encrypt)

				  ? CCP_DES3_ACTION_ENCRYPT

				  : CCP_DES3_ACTION_DECRYPT;

	rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;

	rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;

	rctx->cmd.u.des3.iv = iv_sg;

	rctx->cmd.u.des3.iv_len = iv_len;

	rctx->cmd.u.des3.src = req->src;

	rctx->cmd.u.des3.src_len = req->nbytes;

	rctx->cmd.u.des3.dst = req->dst;



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



	return ret;

}



static int ccp_des3_encrypt(struct ablkcipher_request *req)

{

	return ccp_des3_crypt(req, true);

}



static int ccp_des3_decrypt(struct ablkcipher_request *req)

{

	return ccp_des3_crypt(req, false);

}



static int ccp_des3_cra_init(struct crypto_tfm *tfm)

{

	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);



	ctx->complete = ccp_des3_complete;

	ctx->u.des3.key_len = 0;



	tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx);



	return 0;

}



static void ccp_des3_cra_exit(struct crypto_tfm *tfm)

{

}



static struct crypto_alg ccp_des3_defaults = {

	.cra_flags	= CRYPTO_ALG_TYPE_ABLKCIPHER |

		CRYPTO_ALG_ASYNC |

		CRYPTO_ALG_KERN_DRIVER_ONLY |

		CRYPTO_ALG_NEED_FALLBACK,

	.cra_blocksize	= DES3_EDE_BLOCK_SIZE,

	.cra_ctxsize	= sizeof(struct ccp_ctx),

	.cra_priority	= CCP_CRA_PRIORITY,

	.cra_type	= &crypto_ablkcipher_type,

	.cra_init	= ccp_des3_cra_init,

	.cra_exit	= ccp_des3_cra_exit,

	.cra_module	= THIS_MODULE,

	.cra_ablkcipher	= {

		.setkey		= ccp_des3_setkey,

		.encrypt	= ccp_des3_encrypt,

		.decrypt	= ccp_des3_decrypt,

		.min_keysize	= DES3_EDE_KEY_SIZE,

		.max_keysize	= DES3_EDE_KEY_SIZE,

	},

};



struct ccp_des3_def {

	enum ccp_des3_mode mode;

	unsigned int version;

	const char *name;

	const char *driver_name;

	unsigned int blocksize;

	unsigned int ivsize;

	struct crypto_alg *alg_defaults;

};



static struct ccp_des3_def des3_algs[] = {

	{

		.mode		= CCP_DES3_MODE_ECB,

		.version	= CCP_VERSION(5, 0),

		.name		= "ecb(des3_ede)",

		.driver_name	= "ecb-des3-ccp",

		.blocksize	= DES3_EDE_BLOCK_SIZE,

		.ivsize		= 0,

		.alg_defaults	= &ccp_des3_defaults,

	},

	{

		.mode		= CCP_DES3_MODE_CBC,

		.version	= CCP_VERSION(5, 0),

		.name		= "cbc(des3_ede)",

		.driver_name	= "cbc-des3-ccp",

		.blocksize	= DES3_EDE_BLOCK_SIZE,

		.ivsize		= DES3_EDE_BLOCK_SIZE,

		.alg_defaults	= &ccp_des3_defaults,

	},

};



static int ccp_register_des3_alg(struct list_head *head,

				 const struct ccp_des3_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;

	*alg = *def->alg_defaults;

	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_des3_algs(struct list_head *head)

{

	int i, ret;

	unsigned int ccpversion = ccp_version();



	for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {

		if (des3_algs[i].version > ccpversion)

			continue;

		ret = ccp_register_des3_alg(head, &des3_algs[i]);

		if (ret)

			return ret;

	}



	return 0;

}

drivers/crypto/ccp/ccp-crypto-main.c

+10 −0
Original line number Diff line number Diff line
@@ -33,6 +33,10 @@ static unsigned int sha_disable; 
module_param(sha_disable, uint, 0444);

MODULE_PARM_DESC(sha_disable, "Disable use of SHA - any non-zero value");



static unsigned int des3_disable;

module_param(des3_disable, uint, 0444);

MODULE_PARM_DESC(des3_disable, "Disable use of 3DES - any non-zero value");



/* List heads for the supported algorithms */

static LIST_HEAD(hash_algs);

static LIST_HEAD(cipher_algs);
@@ -337,6 +341,12 @@ static int ccp_register_algs(void) 
			return ret;

	}



	if (!des3_disable) {

		ret = ccp_register_des3_algs(&cipher_algs);

		if (ret)

			return ret;

	}



	if (!sha_disable) {

		ret = ccp_register_sha_algs(&hash_algs);

		if (ret)

drivers/crypto/ccp/ccp-crypto.h

+22 −0
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ 
#include <crypto/hash.h>

#include <crypto/sha.h>



#define	CCP_LOG_LEVEL	KERN_INFO



#define CCP_CRA_PRIORITY	300



struct ccp_crypto_ablkcipher_alg {
@@ -137,6 +139,24 @@ struct ccp_aes_cmac_exp_ctx { 
	u8 buf[AES_BLOCK_SIZE];

};



/***** 3DES related defines *****/

struct ccp_des3_ctx {

	enum ccp_engine engine;

	enum ccp_des3_type type;

	enum ccp_des3_mode mode;



	struct scatterlist key_sg;

	unsigned int key_len;

	u8 key[AES_MAX_KEY_SIZE];

};



struct ccp_des3_req_ctx {

	struct scatterlist iv_sg;

	u8 iv[AES_BLOCK_SIZE];



	struct ccp_cmd cmd;

};



/* SHA-related defines

 * These values must be large enough to accommodate any variant

 */
@@ -201,6 +221,7 @@ struct ccp_ctx { 
	union {

		struct ccp_aes_ctx aes;

		struct ccp_sha_ctx sha;

		struct ccp_des3_ctx des3;

	} u;

};
@@ -213,5 +234,6 @@ int ccp_register_aes_algs(struct list_head *head); 
int ccp_register_aes_cmac_algs(struct list_head *head);

int ccp_register_aes_xts_algs(struct list_head *head);

int ccp_register_sha_algs(struct list_head *head);

int ccp_register_des3_algs(struct list_head *head);



#endif

drivers/crypto/ccp/ccp-dev-v3.c

+1 −0
Original line number Diff line number Diff line
@@ -553,6 +553,7 @@ static irqreturn_t ccp_irq_handler(int irq, void *data) 
static const struct ccp_actions ccp3_actions = {

	.aes = ccp_perform_aes,

	.xts_aes = ccp_perform_xts_aes,

	.des3 = NULL,

	.sha = ccp_perform_sha,

	.rsa = ccp_perform_rsa,

	.passthru = ccp_perform_passthru,