#ifndef _CRYPTO_GCM_H#define _CRYPTO_GCM_H #include <linux/errno.h> #include <crypto/aes.h>#include <crypto/gf128hash.h> #define GCM_AES_IV_SIZE 12#define GCM_RFC4106_IV_SIZE 8#define GCM_RFC4543_IV_SIZE 8 /* * validate authentication tag for GCM */static inline int crypto_gcm_check_authsize(unsigned int authsize){	switch (authsize) {	case 4:	case 8:	case 12:	case 13:	case 14:	case 15:	case 16:		break;	default:		return -EINVAL;	} 	return 0;} /* * validate authentication tag for RFC4106 */static inline int crypto_rfc4106_check_authsize(unsigned int authsize){	switch (authsize) {	case 8:	case 12:	case 16:		break;	default:		return -EINVAL;	} 	return 0;} /* * validate assoclen for RFC4106/RFC4543 */static inline int crypto_ipsec_check_assoclen(unsigned int assoclen){	switch (assoclen) {	case 16:	case 20:		break;	default:		return -EINVAL;	} 	return 0;} struct aesgcm_ctx {	struct ghash_key	ghash_key;	struct aes_enckey	aes_key;	unsigned int		authsize;}; int aesgcm_expandkey(struct aesgcm_ctx *ctx, const u8 *key,		     unsigned int keysize, unsigned int authsize); void aesgcm_encrypt(const struct aesgcm_ctx *ctx, u8 *dst, const u8 *src,		    int crypt_len, const u8 *assoc, int assoc_len,		    const u8 iv[GCM_AES_IV_SIZE], u8 *authtag); bool __must_check aesgcm_decrypt(const struct aesgcm_ctx *ctx, u8 *dst,				 const u8 *src, int crypt_len, const u8 *assoc,				 int assoc_len, const u8 iv[GCM_AES_IV_SIZE],				 const u8 *authtag); #endif