00000210  8a 20 e3 b9 da b7 7d e4  ec 33 28 96 29 d7 dc a3  |. ....}..3(.)...|
00000220  d0 54 76 cd a6 99 17 e8  0f 14 d2 7c 4b 68 0a 80  |.Tv........|Kh..|
00000230  4f 0b 2b b5 16 68 dc 25  42 b5 0b f7 13 6a c5 81  |O.+..h.%B....j..|
00000240  c0 18 bc fb 40 86 cc 99  2e 70 2b 9a 72 eb be 57  |....@....p+.r..W|
00000250  a0 43 92 83 3b 7e c8 02  43 ab 17 7a 73 87 1a a2  |.C..;~..C..zs...|

func permuteInitialBlock(block uint64) uint64 {
	// block = b7 b6 b5 b4 b3 b2 b1 b0 (8 bytes)
	b1 := block >> 48
	b2 := block << 48
	block ^= b1 ^ b2 ^ b1<<48 ^ b2>>48

	// block = b1 b0 b5 b4 b3 b2 b7 b6
	b1 = block >> 32 & 0xff00ff
	b2 = (block & 0xff00ff00)
	block ^= b1<<32 ^ b2 ^ b1<<8 ^ b2<<24 // exchange b0 b4 with b3 b7

	// block is now b1 b3 b5 b7 b0 b2 b4 b6, the permutation:
	//                  ...  8

00000010  77 d9 f2 87 3f a8 93 a1  13 6f a0 f5 4e d0 1b fe  |w...?....o..N...|
00000020  cc 04 c0 7c 8d 7d 2e 5c  c2 6d 69 20 1e 1f 96 97  |...|.}.\.mi ....|
00000030  82 97 85 5b fd c1 59 cb  a5 2a 91 c1 b5 88 06 6c  |...[..Y..*.....l|
00000040  b0 ed 5c 41 78 cc f6 3c  28 d9 29 2b 00 04 13 03  |..\Ax..<(.)+....|
00000050  00 ff 01 00 00 9a 00 0b  00 04 03 00 01 02 00 0a  |................|

00000100  ae 68 1e dd 6f ce 86 e1  7e 6e b2 48 3e 81 e5 4e  |.h..o...~n.H>..N|
00000110  e2 c6 88 4b 64 dc f5 30  bb d3 ff 65 cc 5b f4 dd  |...Kd..0...e.[..|
00000120  b5 6a 3e 3e d0 1d de 47  c3 76 ad 19 f6 45 2c 8c  |.j>>...G.v...E,.|
00000130  bc d8 1d 01 4c 1f 70 90  46 76 48 8b 8f 83 cc 4a  |....L.p.FvH....J|
00000140  5c 8f 40 76 da e0 89 ec  1d 2b c4 4e 30 76 28 41  |\.@v.....+.N0v(A|

000002c0  b8 ec 51 46 99 6d 1e 83  9b 9d 44 a7 85 5a 10 23  |..QF.m....D..Z.#|
000002d0  74 a3 b6 09 b5 d7 2a 12  6a e2 2a da 5d 87 d9 fe  |t.....*.j.*.]...|
000002e0  b6 c7 8f c8 03 27 b0 6e  98 57 6f e4 d5 8b 88 5d  |.....'.n.Wo....]|
000002f0  0a b3 c4 a1 ae df 89 53  af d5 8e 59 97 2d 65 c0  |.......S...Y.-e.|
00000300  52 e8 5f 8a 37 3f 8b ef  77 fc 93 0c b5 50 3b 94  |R._.7?..w....P;.|

>>> Flow 1 (client to server)
00000000  16 03 01 00 59 01 00 00  55 03 03 01 3d 46 ff b5  |....Y...U...=F..|
00000010  47 eb 03 bd 9b 27 66 92  92 db 11 f9 58 1d 21 ba  |G....'f.....X.!.|
00000020  b9 51 90 81 d0 8f 7e 3c  cd 7b b8 00 00 04 cc a8  |.Q....~<.{......|
00000030  00 ff 01 00 00 28 00 0b  00 04 03 00 01 02 00 0a  |.....(..........|
00000040  00 0c 00 0a 00 1d 00 17  00 1e 00 19 00 18 00 16  |................|

    byte b2 = readAndCheckByte();
    byte b3 = readAndCheckByte();
    byte b4 = readAndCheckByte();
    byte b5 = readAndCheckByte();
    byte b6 = readAndCheckByte();
    byte b7 = readAndCheckByte();
    byte b8 = readAndCheckByte();

    return Longs.fromBytes(b8, b7, b6, b5, b4, b3, b2, b1);
  }

  /**
   * Reads a {@code float} as specified by {@link DataInputStream#readFloat()}, except using

00000090  01 16 03 03 00 40 c9 64  79 e7 15 1d 30 15 95 89  |.....@.dy...0...|
000000a0  b1 9b 12 42 69 4b 22 20  54 5a aa b6 71 02 1c 3f  |...BiK" TZ..q..?|
000000b0  7c b5 66 07 b5 1f 55 96  3f ce 47 1f 66 52 d8 6b  ||.f...U.?.G.fR.k|
000000c0  65 71 c0 4e 0b 7e 55 e0  f5 af 42 29 af 2b 1d 0e  |eq.N.~U...B).+..|
000000d0  e6 96 cd 7b fc d3                                 |...{..|
>>> Flow 4 (server to client)

    byte b2 = readAndCheckByte();
    byte b3 = readAndCheckByte();
    byte b4 = readAndCheckByte();
    byte b5 = readAndCheckByte();
    byte b6 = readAndCheckByte();
    byte b7 = readAndCheckByte();
    byte b8 = readAndCheckByte();

    return Longs.fromBytes(b8, b7, b6, b5, b4, b3, b2, b1);
  }

  /**
   * Reads a {@code float} as specified by {@link DataInputStream#readFloat()}, except using

000000e0  45 00 17 00 41 04 1e 18  37 ef 0d 19 51 88 35 75  |E...A...7...Q.5u|
000000f0  71 b5 e5 54 5b 12 2e 8f  09 67 fd a7 24 20 3e b2  |q..T[....g..$ >.|
00000100  56 1c ce 97 28 5e f8 2b  2d 4f 9e f1 07 9f 6c 4b  |V...(^.+-O....lK|
00000110  5b 83 56 e2 32 42 e9 58  b6 d7 49 a6 b5 68 1a 41  |[.V.2B.X..I..h.A|
00000120  03 56 6b dc 5a 89                                 |.Vk.Z.|
>>> Flow 4 (server to client)