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authorTom Lendacky <thomas.lendacky@amd.com>2014-01-24 16:17:56 -0600
committerHerbert Xu <herbert@gondor.apana.org.au>2014-02-09 09:59:15 +0800
commitd81ed6534fd988a8a24fb607b459444d4b3d391a (patch)
tree2aa7c861542ded81d5c1c1ebb7bd82bde357ed60 /drivers/crypto
parent80e84c16e72a0eac30085322b4664b7b6b0dde75 (diff)
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: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/ccp/ccp-crypto-main.c37
1 files changed, 25 insertions, 12 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-main.c b/drivers/crypto/ccp/ccp-crypto-main.c
index 2636f044789d..b3f22b07b5bd 100644
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -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);
@@ -337,21 +346,25 @@ static int ccp_register_algs(void)
{
int ret;
- ret = ccp_register_aes_algs(&cipher_algs);
- if (ret)
- return ret;
+ if (!aes_disable) {
+ ret = ccp_register_aes_algs(&cipher_algs);
+ if (ret)
+ return ret;
- ret = ccp_register_aes_cmac_algs(&hash_algs);
- if (ret)
- return ret;
+ ret = ccp_register_aes_cmac_algs(&hash_algs);
+ if (ret)
+ return ret;
- ret = ccp_register_aes_xts_algs(&cipher_algs);
- if (ret)
- return ret;
+ ret = ccp_register_aes_xts_algs(&cipher_algs);
+ if (ret)
+ return ret;
+ }
- ret = ccp_register_sha_algs(&hash_algs);
- if (ret)
- return ret;
+ if (!sha_disable) {
+ ret = ccp_register_sha_algs(&hash_algs);
+ if (ret)
+ return ret;
+ }
return 0;
}