crypto: ghash-generic - move common definitions to a new header file

#include <crypto/algapi.h>

#include <crypto/gf128mul.h>

#include <crypto/ghash.h>

#include <crypto/internal/hash.h>

#include <linux/crypto.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#define GHASH_BLOCK_SIZE	16

#define GHASH_DIGEST_SIZE	16

struct ghash_ctx {

	struct gf128mul_4k *gf128;

};

struct ghash_desc_ctx {

	u8 buffer[GHASH_BLOCK_SIZE];

	u32 bytes;

};

static int ghash_init(struct shash_desc *desc)

{

	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);

/*

 * Common values for GHASH algorithms

 */

#ifndef __CRYPTO_GHASH_H__

#define __CRYPTO_GHASH_H__

#include <linux/types.h>

#include <crypto/gf128mul.h>

#define GHASH_BLOCK_SIZE	16

#define GHASH_DIGEST_SIZE	16

struct ghash_ctx {

	struct gf128mul_4k *gf128;

};

struct ghash_desc_ctx {

	u8 buffer[GHASH_BLOCK_SIZE];

	u32 bytes;

};

#endif