/* $OpenBSD: modes_local.h,v 1.2 2023/07/08 14:55:36 beck Exp $ */
/* ====================================================================
 * Copyright (c) 2010 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use is governed by OpenSSL license.
 * ====================================================================
 */

#include <endian.h>

#include <openssl/opensslconf.h>

#include <openssl/modes.h>

__BEGIN_HIDDEN_DECLS

#if defined(_LP64)
typedef long i64;
typedef unsigned long u64;
#define U64(C) C##UL
#else
typedef long long i64;
typedef unsigned long long u64;
#define U64(C) C##ULL
#endif

typedef unsigned int u32;
typedef unsigned char u8;

#if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)
#if defined(__GNUC__) && __GNUC__>=2
# if defined(__x86_64) || defined(__x86_64__)
#  define BSWAP8(x) ({	u64 ret=(x);					\
			asm ("bswapq %0"				\
			: "+r"(ret));	ret;		})
#  define BSWAP4(x) ({	u32 ret=(x);					\
			asm ("bswapl %0"				\
			: "+r"(ret));	ret;		})
# elif (defined(__i386) || defined(__i386__))
#  define BSWAP8(x) ({	u32 lo=(u64)(x)>>32,hi=(x);			\
			asm ("bswapl %0; bswapl %1"			\
			: "+r"(hi),"+r"(lo));				\
			(u64)hi<<32|lo;			})
#  define BSWAP4(x) ({	u32 ret=(x);					\
			asm ("bswapl %0"				\
			: "+r"(ret));	ret;		})
# elif (defined(__arm__) || defined(__arm)) && !defined(__STRICT_ALIGNMENT)
#  define BSWAP8(x) ({	u32 lo=(u64)(x)>>32,hi=(x);			\
			asm ("rev %0,%0; rev %1,%1"			\
			: "+r"(hi),"+r"(lo));				\
			(u64)hi<<32|lo;			})
#  define BSWAP4(x) ({	u32 ret;					\
			asm ("rev %0,%1"				\
			: "=r"(ret) : "r"((u32)(x)));			\
			ret;				})
# endif
#endif
#endif

#if defined(BSWAP4) && !defined(__STRICT_ALIGNMENT)
#define GETU32(p)	BSWAP4(*(const u32 *)(p))
#define PUTU32(p,v)	*(u32 *)(p) = BSWAP4(v)
#else
#define GETU32(p)	((u32)(p)[0]<<24|(u32)(p)[1]<<16|(u32)(p)[2]<<8|(u32)(p)[3])
#define PUTU32(p,v)	((p)[0]=(u8)((v)>>24),(p)[1]=(u8)((v)>>16),(p)[2]=(u8)((v)>>8),(p)[3]=(u8)(v))
#endif

/* GCM definitions */

typedef struct {
	u64 hi, lo;
} u128;

#ifdef	TABLE_BITS
#undef	TABLE_BITS
#endif
/*
 * Even though permitted values for TABLE_BITS are 8, 4 and 1, it should
 * never be set to 8 [or 1]. For further information see gcm128.c.
 */
#define	TABLE_BITS 4

struct gcm128_context {
	/* Following 6 names follow names in GCM specification */
	union {
		u64 u[2];
		u32 d[4];
		u8 c[16];
		size_t t[16/sizeof(size_t)];
	} Yi, EKi, EK0, len, Xi, H;
	/* Relative position of Xi, H and pre-computed Htable is used
	 * in some assembler modules, i.e. don't change the order! */
#if TABLE_BITS==8
	u128 Htable[256];
#else
	u128 Htable[16];
	void (*gmult)(u64 Xi[2], const u128 Htable[16]);
	void (*ghash)(u64 Xi[2], const u128 Htable[16], const u8 *inp,
	    size_t len);
#endif
	unsigned int mres, ares;
	block128_f block;
	void *key;
};

struct xts128_context {
	void      *key1, *key2;
	block128_f block1, block2;
};

struct ccm128_context {
	union {
		u64 u[2];
		u8 c[16];
	} nonce, cmac;
	u64 blocks;
	block128_f block;
	void *key;
};

__END_HIDDEN_DECLS