crypto: md5 - Add export support

This patch adds export/import support to md5. The exported type is
defined by struct md5_state.

This is modeled after the equivalent change to sha1_generic.

Signed-off-by: Max Vozeler <max@hinterhof.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/md5.h

@@ -0,0 +1,17 @@
+#ifndef _CRYPTO_MD5_H
+#define _CRYPTO_MD5_H
+
+#include <linux/types.h>
+
+#define MD5_DIGEST_SIZE		16
+#define MD5_HMAC_BLOCK_SIZE	64
+#define MD5_BLOCK_WORDS		16
+#define MD5_HASH_WORDS		4
+
+struct md5_state {
+	u32 hash[MD5_HASH_WORDS];
+	u32 block[MD5_BLOCK_WORDS];
+	u64 byte_count;
+};
+
+#endif