/* ====================================================================
 * 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
#if defined(__i386)     || defined(__i386__)    || \
    defined(__x86_64)   || defined(__x86_64__)  || \
    defined(_M_IX86)    || defined(_M_AMD64)    || defined(_M_X64) || \
    defined(__s390__)   || defined(__s390x__)
# undef STRICT_ALIGNMENT
#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(__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;
};
