staging: skein: Adds Loadable Module Support

Adds loadable module support to the Skein Hashing Algorithm driver.
Signed-off-by: Eric Rost <eric.rost@mybabylon.net>
Reviewed-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/skein/Kconfig

 config CRYPTO_SKEIN
-	bool "Skein digest algorithm"
+	tristate "Skein digest algorithm"
 	depends on (X86 || UML_X86) && 64BIT && CRYPTO
 	select CRYPTO_HASH
 	select CRYPTO_ALGAPI

drivers/staging/skein/Makefile

 #
 # Makefile for the skein secure hash algorithm
 #
-obj-$(CONFIG_CRYPTO_SKEIN) += skein_base.o \
+obj-$(CONFIG_CRYPTO_SKEIN) += skein.o
+skein-y := skein_base.o \
 	   skein_api.o \
 	   skein_block.o \
 	   threefish_block.o \

drivers/staging/skein/skein_generic.c

@@ -16,6 +16,7 @@
  */
 #include <linux/types.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <crypto/internal/hash.h>
 #include "skein_base.h"
 
@@ -139,6 +140,7 @@ static struct shash_alg alg256 = {
 		.cra_driver_name	=	"skein",
 		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize		=	SKEIN_256_BLOCK_BYTES,
+		.cra_module		=	THIS_MODULE,
 	}
 };
 
@@ -156,6 +158,7 @@ static struct shash_alg alg512 = {
 		.cra_driver_name	=	"skein",
 		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize		=	SKEIN_512_BLOCK_BYTES,
+		.cra_module		=	THIS_MODULE,
 	}
 };
 
@@ -173,6 +176,7 @@ static struct shash_alg alg1024 = {
 		.cra_driver_name	=	"skein",
 		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize		=	SKEIN_1024_BLOCK_BYTES,
+		.cra_module		=	THIS_MODULE,
 	}
 };
 
@@ -196,4 +200,17 @@ static int __init skein_generic_init(void)
 	return -1;
 }
 
-device_initcall(skein_generic_init);
+static void __exit skein_generic_fini(void)
+{
+	crypto_unregister_shash(&alg256);
+	crypto_unregister_shash(&alg512);
+	crypto_unregister_shash(&alg1024);
+}
+
+module_init(skein_generic_init);
+module_exit(skein_generic_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Skein Hash Algorithm");
+
+MODULE_ALIAS("skein");