Source file src/crypto/des/const.go

     1	// Copyright 2010 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// Package des implements the Data Encryption Standard (DES) and the
     6	// Triple Data Encryption Algorithm (TDEA) as defined
     7	// in U.S. Federal Information Processing Standards Publication 46-3.
     8	//
     9	// DES is cryptographically broken and should not be used for secure
    10	// applications.
    11	package des
    12	
    13	// Used to perform an initial permutation of a 64-bit input block.
    14	var initialPermutation = [64]byte{
    15		6, 14, 22, 30, 38, 46, 54, 62,
    16		4, 12, 20, 28, 36, 44, 52, 60,
    17		2, 10, 18, 26, 34, 42, 50, 58,
    18		0, 8, 16, 24, 32, 40, 48, 56,
    19		7, 15, 23, 31, 39, 47, 55, 63,
    20		5, 13, 21, 29, 37, 45, 53, 61,
    21		3, 11, 19, 27, 35, 43, 51, 59,
    22		1, 9, 17, 25, 33, 41, 49, 57,
    23	}
    24	
    25	// Used to perform a final permutation of a 4-bit preoutput block. This is the
    26	// inverse of initialPermutation
    27	var finalPermutation = [64]byte{
    28		24, 56, 16, 48, 8, 40, 0, 32,
    29		25, 57, 17, 49, 9, 41, 1, 33,
    30		26, 58, 18, 50, 10, 42, 2, 34,
    31		27, 59, 19, 51, 11, 43, 3, 35,
    32		28, 60, 20, 52, 12, 44, 4, 36,
    33		29, 61, 21, 53, 13, 45, 5, 37,
    34		30, 62, 22, 54, 14, 46, 6, 38,
    35		31, 63, 23, 55, 15, 47, 7, 39,
    36	}
    37	
    38	// Used to expand an input block of 32 bits, producing an output block of 48
    39	// bits.
    40	var expansionFunction = [48]byte{
    41		0, 31, 30, 29, 28, 27, 28, 27,
    42		26, 25, 24, 23, 24, 23, 22, 21,
    43		20, 19, 20, 19, 18, 17, 16, 15,
    44		16, 15, 14, 13, 12, 11, 12, 11,
    45		10, 9, 8, 7, 8, 7, 6, 5,
    46		4, 3, 4, 3, 2, 1, 0, 31,
    47	}
    48	
    49	// Yields a 32-bit output from a 32-bit input
    50	var permutationFunction = [32]byte{
    51		16, 25, 12, 11, 3, 20, 4, 15,
    52		31, 17, 9, 6, 27, 14, 1, 22,
    53		30, 24, 8, 18, 0, 5, 29, 23,
    54		13, 19, 2, 26, 10, 21, 28, 7,
    55	}
    56	
    57	// Used in the key schedule to select 56 bits
    58	// from a 64-bit input.
    59	var permutedChoice1 = [56]byte{
    60		7, 15, 23, 31, 39, 47, 55, 63,
    61		6, 14, 22, 30, 38, 46, 54, 62,
    62		5, 13, 21, 29, 37, 45, 53, 61,
    63		4, 12, 20, 28, 1, 9, 17, 25,
    64		33, 41, 49, 57, 2, 10, 18, 26,
    65		34, 42, 50, 58, 3, 11, 19, 27,
    66		35, 43, 51, 59, 36, 44, 52, 60,
    67	}
    68	
    69	// Used in the key schedule to produce each subkey by selecting 48 bits from
    70	// the 56-bit input
    71	var permutedChoice2 = [48]byte{
    72		42, 39, 45, 32, 55, 51, 53, 28,
    73		41, 50, 35, 46, 33, 37, 44, 52,
    74		30, 48, 40, 49, 29, 36, 43, 54,
    75		15, 4, 25, 19, 9, 1, 26, 16,
    76		5, 11, 23, 8, 12, 7, 17, 0,
    77		22, 3, 10, 14, 6, 20, 27, 24,
    78	}
    79	
    80	// 8 S-boxes composed of 4 rows and 16 columns
    81	// Used in the DES cipher function
    82	var sBoxes = [8][4][16]uint8{
    83		// S-box 1
    84		{
    85			{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
    86			{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
    87			{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
    88			{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13},
    89		},
    90		// S-box 2
    91		{
    92			{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
    93			{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
    94			{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
    95			{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9},
    96		},
    97		// S-box 3
    98		{
    99			{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
   100			{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
   101			{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
   102			{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12},
   103		},
   104		// S-box 4
   105		{
   106			{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
   107			{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
   108			{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
   109			{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14},
   110		},
   111		// S-box 5
   112		{
   113			{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
   114			{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
   115			{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
   116			{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3},
   117		},
   118		// S-box 6
   119		{
   120			{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
   121			{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
   122			{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
   123			{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13},
   124		},
   125		// S-box 7
   126		{
   127			{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
   128			{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
   129			{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
   130			{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12},
   131		},
   132		// S-box 8
   133		{
   134			{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
   135			{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
   136			{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
   137			{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11},
   138		},
   139	}
   140	
   141	// Size of left rotation per round in each half of the key schedule
   142	var ksRotations = [16]uint8{1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1}
   143	

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