[CRYPTO] des: Create header file for common macros

This patch creates include/crypto/des.h for common macros shared between
DES implementations.

Signed-off-by: Evgeniy Polyakov <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

crypto/des_generic.c

···
 #include <linux/crypto.h>
 #include <linux/types.h>
 
-#define DES_KEY_SIZE		8
-#define DES_EXPKEY_WORDS	32
-#define DES_BLOCK_SIZE		8
-
-#define DES3_EDE_KEY_SIZE	(3 * DES_KEY_SIZE)
-#define DES3_EDE_EXPKEY_WORDS	(3 * DES_EXPKEY_WORDS)
-#define DES3_EDE_BLOCK_SIZE	DES_BLOCK_SIZE
+#include <crypto/des.h>
 
 #define ROL(x, r) ((x) = rol32((x), (r)))
 #define ROR(x, r) ((x) = ror32((x), (r)))

include/crypto/des.h

···
+/* 
+ * DES & Triple DES EDE Cipher Algorithms.
+ */
+
+#ifndef __CRYPTO_DES_H
+#define __CRYPTO_DES_H
+
+#define DES_KEY_SIZE		8
+#define DES_EXPKEY_WORDS	32
+#define DES_BLOCK_SIZE		8
+
+#define DES3_EDE_KEY_SIZE	(3 * DES_KEY_SIZE)
+#define DES3_EDE_EXPKEY_WORDS	(3 * DES_EXPKEY_WORDS)
+#define DES3_EDE_BLOCK_SIZE	DES_BLOCK_SIZE
+
+
+extern unsigned long des_ekey(u32 *pe, const u8 *k);
+
+#endif /* __CRYPTO_DES_H */