0x61, 0x67, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x18, 0x09, 0x20,
	0x01, 0x28, 0x09, 0x52, 0x06, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x12, 0x14, 0x0a, 0x05, 0x68,
	0x74, 0x74, 0x70, 0x32, 0x18, 0x07, 0x20, 0x01, 0x28, 0x08, 0x52, 0x05, 0x68, 0x74, 0x74, 0x70,
	0x32, 0x12, 0x14, 0x0a, 0x05, 0x68, 0x74, 0x74, 0x70, 0x33, 0x18, 0x0f, 0x20, 0x01, 0x28, 0x08,

	0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65, 0x12, 0x1f, 0x0a, 0x09, 0x61, 0x6c, 0x74, 0x5f,
	0x68, 0x6f, 0x73, 0x74, 0x73, 0x18, 0x05, 0x20, 0x03, 0x28, 0x09, 0x42, 0x02, 0x18, 0x01, 0x52,
	0x08, 0x61, 0x6c, 0x74, 0x48, 0x6f, 0x73, 0x74, 0x73, 0x1a, 0x65, 0x0a, 0x0a, 0x54, 0x61, 0x62,
	0x6c, 0x65, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01,

	0x67, 0x74, 0x68, 0x22, 0x9d, 0x01, 0x0a, 0x0b, 0x53, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x4d, 0x61,
	0x74, 0x63, 0x68, 0x12, 0x16, 0x0a, 0x05, 0x65, 0x78, 0x61, 0x63, 0x74, 0x18, 0x01, 0x20, 0x01,
	0x28, 0x09, 0x48, 0x00, 0x52, 0x05, 0x65, 0x78, 0x61, 0x63, 0x74, 0x12, 0x18, 0x0a, 0x06, 0x70,
	0x72, 0x65, 0x66, 0x69, 0x78, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x06, 0x70,

	crypto.SHA384:    {0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30},
	crypto.SHA512:    {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40},
	crypto.MD5SHA1:   {}, // A special TLS case which doesn't use an ASN1 prefix.

	0x65, 0x6e, 0x74, 0x22, 0x1b, 0x0a, 0x03, 0x41, 0x63, 0x6b, 0x12, 0x14, 0x0a, 0x05, 0x65, 0x72,
	0x72, 0x6f, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72,
	0x22, 0x87, 0x02, 0x0a, 0x0f, 0x57, 0x6f, 0x72, 0x6b, 0x6c, 0x6f, 0x61, 0x64, 0x52, 0x65, 0x71,
	0x75, 0x65, 0x73, 0x74, 0x12, 0x33, 0x0a, 0x03, 0x61, 0x64, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28,

var staticuint64s = [...]uint64{
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,

#define BLK_KEY    R5
#define BLK_ROUNDS R6
#define BLK_IDX    R7

DATA ·rcon+0x00(SB)/8, $0x0f0e0d0c0b0a0908 // Permute for vector doubleword endian swap
DATA ·rcon+0x08(SB)/8, $0x0706050403020100
DATA ·rcon+0x10(SB)/8, $0x0100000001000000 // RCON
DATA ·rcon+0x18(SB)/8, $0x0100000001000000 // RCON
DATA ·rcon+0x20(SB)/8, $0x1b0000001b000000
DATA ·rcon+0x28(SB)/8, $0x1b0000001b000000
DATA ·rcon+0x30(SB)/8, $0x0d0e0f0c0d0e0f0c // MASK

		// is not needed.
		e.buf[0] = 0x00
		e.buf[1] = 0x00 // Background Color Index.
		e.buf[2] = 0x00 // Pixel Aspect Ratio.
		e.write(e.buf[:3])
	}

	// Add animation info if necessary.
	if len(e.g.Image) > 1 && e.g.LoopCount >= 0 {
		e.buf[0] = 0x21 // Extension Introducer.
		e.buf[1] = 0xff // Application Label.
		e.buf[2] = 0x0b // Block Size.
		e.write(e.buf[:3])

		},
		{
			in:   FromInt32(math.MaxUint8 + 1), // min positive integer representable in three bytes
			want: []byte{0x19, 0x01, 0x00},
		},
		{
			in:   FromInt32(math.MaxUint16), // max positive integer representable in three bytes
			want: []byte{0x19, 0xff, 0xff},
		},
		{
			in:   FromInt32(math.MaxUint16 + 1), // min positive integer representable in five bytes
			want: []byte{0x1a, 0x00, 0x01, 0x00, 0x00},

			recognizes: true,
		},
		{
			in:         []byte{0xff, 0xff, 0xff},
			recognizes: false,
		},
		{
			in:         []byte{0xd9, 0xd9, 0xf7, 0x01, 0x02, 0x03},
			recognizes: true,
		},
		{
			in:         []byte{0xff, 0xff, 0xff, 0x01, 0x02, 0x03},
			recognizes: false,
		},
	} {
		t.Run(hex.EncodeToString(tc.in), func(t *testing.T) {
			s := NewSerializer(nil, nil)