modes_lcl.h

/* ====================================================================
 * Copyright (c) 2010 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use is governed by OpenSSL license.
 * ====================================================================
 */

#include <openssl/modes.h>


#if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
typedef __int64 i64;
typedef unsigned __int64 u64;
#define U64(C) C##UI64
#elif defined(__arch64__)
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;

#define STRICT_ALIGNMENT 1
#ifndef PEDANTIC
# if defined(__i386)	|| defined(__i386__)	|| \
     defined(__x86_64)	|| defined(__x86_64__)	|| \
     defined(_M_IX86)	|| defined(_M_AMD64)	|| defined(_M_X64) || \
     defined(__aarch64__)			|| \
     defined(__s390__)	|| defined(__s390x__)
#  undef STRICT_ALIGNMENT
# endif
#endif

#if !defined(PEDANTIC) && !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__)) && !defined(I386_ONLY)
#   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(__aarch64__)
#   define BSWAP8(x) ({	u64 ret;			\
			asm ("rev %0,%1"		\
			: "=r"(ret) : "r"(x)); ret;	})
#   define BSWAP4(x) ({	u32 ret;			\
			asm ("rev %w0,%w1"		\
			: "=r"(ret) : "r"(x)); 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
# elif defined(_MSC_VER)
#  if _MSC_VER>=1300
#   pragma intrinsic(_byteswap_uint64,_byteswap_ulong)
#   define BSWAP8(x)	_byteswap_uint64((u64)(x))
#   define BSWAP4(x)	_byteswap_ulong((u32)(x))
#  elif defined(_M_IX86)
    __inline u32 _bswap4(u32 val) {
	_asm mov eax,val
	_asm bswap eax
    }
#   define BSWAP4(x)	_bswap4(x)
#  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;
};

#ifndef OPENSSL_NO_OCB

#ifdef STRICT_ALIGNMENT
typedef struct {
    unsigned char a[16];
} OCB_BLOCK;
# define ocb_block16_xor(in1,in2,out) \
    ocb_block_xor((in1)->a,(in2)->a,16,(out)->a)
#else /* STRICT_ALIGNMENT */
typedef struct {
    u64 a;
    u64 b;
} OCB_BLOCK;
# define ocb_block16_xor(in1,in2,out) \
    (out)->a=(in1)->a^(in2)->a; (out)->b=(in1)->b^(in2)->b;
#endif /* STRICT_ALIGNMENT */

struct ocb128_context {
	/* Need both encrypt and decrypt key schedules for decryption */
	block128_f encrypt;
	block128_f decrypt;
	void *keyenc;
	void *keydec;

	/* Key dependent variables. Can be reused if key remains the same */
	size_t l_index;
	size_t max_l_index;
	OCB_BLOCK l_star;
	OCB_BLOCK l_dollar;
	OCB_BLOCK *l;

	/* Must be reset for each session */
	u64 blocks_hashed;
	u64 blocks_processed;
	OCB_BLOCK tag;
	OCB_BLOCK offset_aad;
	OCB_BLOCK sum;
	OCB_BLOCK offset;
	OCB_BLOCK checksum;

};
#endif /* OPENSSL_NO_OCB */