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Commit d81ed653 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

crypto: ccp - Allow for selective disablement of crypto API algorithms 



Introduce module parameters that allow for disabling of a
crypto algorithm by not registering the algorithm with the
crypto API.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 80e84c16

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

+25 −12
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
 */



#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/ccp.h>
@@ -24,6 +25,14 @@ MODULE_LICENSE("GPL"); 
MODULE_VERSION("1.0.0");

MODULE_DESCRIPTION("AMD Cryptographic Coprocessor crypto API support");



static unsigned int aes_disable;

module_param(aes_disable, uint, 0444);

MODULE_PARM_DESC(aes_disable, "Disable use of AES - any non-zero value");



static unsigned int sha_disable;

module_param(sha_disable, uint, 0444);

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





/* List heads for the supported algorithms */

static LIST_HEAD(hash_algs);
@@ -337,6 +346,7 @@ static int ccp_register_algs(void) 
{

	int ret;



	if (!aes_disable) {

		ret = ccp_register_aes_algs(&cipher_algs);

		if (ret)

			return ret;
@@ -348,10 +358,13 @@ static int ccp_register_algs(void) 
		ret = ccp_register_aes_xts_algs(&cipher_algs);

		if (ret)

			return ret;

	}



	if (!sha_disable) {

		ret = ccp_register_sha_algs(&hash_algs);

		if (ret)

			return ret;

	}



	return 0;

}