// XOR.
	if msbSet {
		double.low ^= 0xe100000000000000
	}

	return
}

var gcmReductionTable = []uint16{
	0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0,
	0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0,
}

// mul sets y to y*H, where H is the GCM key, fixed during NewGCMWithNonceSize.
func (g *gcm) mul(y *gcmFieldElement) {

#ifndef WIN32
#include <pthread.h>
#include <signal.h>
#endif

// alignment tests

typedef unsigned char Uint8;
typedef unsigned short Uint16;

typedef enum {
 MOD1 = 0x0000,
 MODX = 0x8000
} SDLMod;

typedef enum {
 A1 = 1,
 B1 = 322,
 SDLK_LAST
} SDLKey;

typedef struct SDL_keysym {
	Uint8 scancode;
	SDLKey sym;
	SDLMod mod;
	Uint16 unicode;
} SDL_keysym;

00000330  03 01 00 0a 0d 00 00 06  03 01 02 40 00 00 16 03  |...........@....|
00000340  01 00 04 0e 00 00 00                              |.......|
>>> Flow 3 (client to server)
00000000  16 03 01 02 0a 0b 00 02  06 00 02 03 00 02 00 30  |...............0|
00000010  82 01 fc 30 82 01 5e 02  09 00 9a 30 84 6c 26 35  |...0..^....0.l&5|
00000020  d9 17 30 09 06 07 2a 86  48 ce 3d 04 01 30 45 31  |..0...*.H.=..0E1|

00000260  e4 c7 78 0d ae cb be 9e  4e 36 24 31 7b 6a 0f 39  |..x.....N6$1{j.9|
00000270  95 12 07 8f 2a 16 03 03  00 b6 0c 00 00 b2 03 00  |....*...........|
00000280  1d 20 04 b4 79 b4 2c 1d  0f b3 4b ff 67 e7 24 88  |. ..y.,...K.g.$.|
00000290  d6 db 4f 1e 66 da 0e f2  89 5a 53 ed 4e ba ad 4c  |..O.f....ZS.N..L|
000002a0  81 0a 04 03 00 8a 30 81  87 02 42 01 fb 16 53 43  |......0...B...SC|

00000360  03 01 02 01 03 02 02 02  04 02 05 02 06 02 00 00  |................|
00000370  16 03 03 00 04 0e 00 00  00                       |.........|
>>> Flow 3 (client to server)
00000000  16 03 03 02 0a 0b 00 02  06 00 02 03 00 02 00 30  |...............0|
00000010  82 01 fc 30 82 01 5e 02  09 00 9a 30 84 6c 26 35  |...0..^....0.l&5|
00000020  d9 17 30 09 06 07 2a 86  48 ce 3d 04 01 30 45 31  |..0...*.H.=..0E1|

00000040  8f a3 6a 0f 61 0f 2d 66  24 c3 fb 7f c0 2f 00 00  |..j.a.-f$..../..|
00000050  11 ff 01 00 01 00 00 0b  00 04 03 00 01 02 00 17  |................|
00000060  00 00 16 03 03 02 59 0b  00 02 55 00 02 52 00 02  |......Y...U..R..|
00000070  4f 30 82 02 4b 30 82 01  b4 a0 03 02 01 02 02 09  |O0..K0..........|
00000080  00 e8 f0 9d 3f e2 5b ea  a6 30 0d 06 09 2a 86 48  |....?.[..0...*.H|
00000090  86 f7 0d 01 01 0b 05 00  30 1f 31 0b 30 09 06 03  |........0.1.0...|

>>> Flow 1 (client to server)
00000000  16 03 01 00 fe 01 00 00  fa 03 03 00 00 00 00 00  |................|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 00 00 20 00 00 00 00  |........... ....|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 32 cc a9  |.............2..|

00000370  03 01 00 0a 0d 00 00 06  03 01 02 40 00 00 16 03  |...........@....|
00000380  01 00 04 0e 00 00 00                              |.......|
>>> Flow 3 (client to server)
00000000  16 03 01 02 0a 0b 00 02  06 00 02 03 00 02 00 30  |...............0|
00000010  82 01 fc 30 82 01 5e 02  09 00 9a 30 84 6c 26 35  |...0..^....0.l&5|
00000020  d9 17 30 09 06 07 2a 86  48 ce 3d 04 01 30 45 31  |..0...*.H.=..0E1|

000003a0  03 01 02 01 03 02 02 02  04 02 05 02 06 02 00 00  |................|
000003b0  16 03 03 00 04 0e 00 00  00                       |.........|
>>> Flow 3 (client to server)
00000000  16 03 03 02 0a 0b 00 02  06 00 02 03 00 02 00 30  |...............0|
00000010  82 01 fc 30 82 01 5e 02  09 00 9a 30 84 6c 26 35  |...0..^....0.l&5|
00000020  d9 17 30 09 06 07 2a 86  48 ce 3d 04 01 30 45 31  |..0...*.H.=..0E1|

00000040  8e 00 44 9d b9 cb 51 0b  a2 9c 64 be c0 2f 00 00  |..D...Q...d../..|
00000050  11 ff 01 00 01 00 00 0b  00 04 03 00 01 02 00 17  |................|
00000060  00 00 16 03 03 02 59 0b  00 02 55 00 02 52 00 02  |......Y...U..R..|
00000070  4f 30 82 02 4b 30 82 01  b4 a0 03 02 01 02 02 09  |O0..K0..........|
00000080  00 e8 f0 9d 3f e2 5b ea  a6 30 0d 06 09 2a 86 48  |....?.[..0...*.H|
00000090  86 f7 0d 01 01 0b 05 00  30 1f 31 0b 30 09 06 03  |........0.1.0...|