/* $OpenBSD: modes_lcl.h,v 1.11 2021/11/09 18:40:21 bcook 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)
#  if (__ARM_ARCH >= 6)
#   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
#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