440 lines
15 KiB
Ruby
440 lines
15 KiB
Ruby
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module Cipher
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#
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# = Brief
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#
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# The Cipher::DES class allows for encryption and decryption of plain
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# text using the "Data Encryption Standard". This version is the modified
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# version which is part of the VNC authentication scheme.
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#
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# Usage is pretty straight forward:
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#
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# des = Cipher::DES.new 'mysecretkey', :encrypt
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# str = des.update 'plain text'
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# str << des.update 'more plain text'
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# str << final
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#
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# Or just use the shortcut class methods:
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#
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# str = Cipher::DES.encrypt 'mysecretkey', 'plain text'
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#
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# = About
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#
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# This code was ported from the file "d3des.c", for portability reasons.
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# It is not expected to be quick, but is only being used currently for the
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# VNC authentication handshake. If you wanted to cipher a lot of text, you
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# should probably compile the original C as an extension.
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#
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# I've included the following copyright info from the C source verbatim:
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#
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# This is D3DES (V5.09) by Richard Outerbridge with the double and
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# triple-length support removed for use in VNC. Also the bytebit[] array
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# has been reversed so that the most significant bit in each byte of the
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# key is ignored, not the least significant.
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#
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# These changes are:
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# Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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#
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# D3DES (V5.09)
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#
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# A portable, public domain, version of the Data Encryption Standard.
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#
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# Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.
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# Thanks to: Dan Hoey for his excellent Initial and Inverse permutation
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# code; Jim Gillogly & Phil Karn for the DES key schedule code; Dennis
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# Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,
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# for humouring me on.
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#
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# Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.
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# (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.
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#
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class DES
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BLOCK_SIZE = 8
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attr_reader :key, :mode
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# Create a des cipher object. +key+ should be cipher key to use, and +mode+ should
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# be either <tt>:encrypt</tt> or <tt>:decrypt</tt>.
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#
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# It will expand +key+ to be 8 bytes by padding with null bytes. If it is longer than
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# 8 bytes, the additional data is discarded.
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def initialize key, mode
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unless [:encrypt, :decrypt].include? mode
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raise ArgumentError, 'invalid mode argument - %s' % mode
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end
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@mode = mode
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# ensure key is 8 bytes. pad with nulls as needed
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key = key[0, BLOCK_SIZE]
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key << 0.chr * (BLOCK_SIZE - key.length)
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@key = key
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# now expand the key schedule
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@keys = self.class.send :prepare_key_stage2, self.class.send(:prepare_key_stage1, key, mode)
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# this internal buffer is used because we must process data in chunks of 8 bytes
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@buf = ''
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end
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# This updates the cipher with +data+, returning any available ciphered output. The +data+ is
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# processed in blocks of 8 bytes, so any residual is added to an internal buffer.
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def update data
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result = ''
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data = @buf + data unless @buf.empty?
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num_blocks, residual = data.length.divmod BLOCK_SIZE
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num_blocks.times do |i|
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block = data[i * BLOCK_SIZE, BLOCK_SIZE].unpack('N2')
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result << self.class.send(:desfunc, block, @keys).pack('N2')
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end
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@buf = residual == 0 ? '' : data[-residual..-1]
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result
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end
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# This flushes the internal buffer by padding it out with null bytes, and doing a final
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# DES round. Note that this means the ciphered text is always padded out to a multiple of
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# 8 bytes.
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def final
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if @buf.empty?
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''
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else
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update 0.chr * (BLOCK_SIZE - @buf.length)
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end
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end
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# A shortcut method to create a cipher object using +key+, and fully encrypt +data+
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def self.encrypt key, data
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des = new key, :encrypt
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des.update(data) << des.final
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end
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# A shortcut method to create a cipher object using +key+, and fully decrypt +data+
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def self.decrypt key, data
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des = new key, :decrypt
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des.update(data) << des.final
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end
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class << self #:nodoc: all
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BYTEBIT = [
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01, 02, 04, 010, 020, 040, 0100, 0200
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]
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BIGBYTE = [
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0x800000, 0x400000, 0x200000, 0x100000,
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0x080000, 0x040000, 0x020000, 0x010000,
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0x008000, 0x004000, 0x002000, 0x001000,
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0x000800, 0x000400, 0x000200, 0x000100,
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0x000080, 0x000040, 0x000020, 0x000010,
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0x000008, 0x000004, 0x000002, 0x000001
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]
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# Use the key schedule specified in the Standard (ANSI X3.92-1981).
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PC1 = [
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56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
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9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
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62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
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13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
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]
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TOTROT = [
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1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
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]
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PC2 = [
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13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
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22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
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40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
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43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
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]
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private
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#
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# Prepares +key+ to be used
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#
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# +key+:: String
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# +mode+:: :encrypt or :decrypt
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#
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# Thanks to James Gillogly & Phil Karn!
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#
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# corresponds to "deskey"
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#
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def prepare_key_stage1 key, mode
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pcr = [nil] * 56
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kn = [nil] * 32
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pc1m = (0...56).map do |j|
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l = PC1[j]
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m = l & 07
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(key[l >> 3] & BYTEBIT[m]) != 0 ? 1 : 0;
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end
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16.times do |i|
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m = mode == :encrypt ? i << 1 : (15 - i) << 1
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n = m + 1
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kn[m] = kn[n] = 0
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28.times do |j|
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l = (j + TOTROT[i]) % 28
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pcr[j] = pc1m[l]
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pcr[j + 28] = pc1m[l + 28]
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end
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24.times do |j|
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kn[m] |= BIGBYTE[j] if pcr[PC2[j]] != 0
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kn[n] |= BIGBYTE[j] if pcr[PC2[j+24]] != 0
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end
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end
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kn
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end
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# corresponds to "cookey"
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def prepare_key_stage2(raw1)
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cook = []
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16.times do |i|
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a = raw1[i * 2 + 0]
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b = raw1[i * 2 + 1]
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x = (a & 0x00fc0000) << 6
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x |= (a & 0x00000fc0) << 10
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x |= (b & 0x00fc0000) >> 10
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x |= (b & 0x00000fc0) >> 6
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cook << x
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x = (a & 0x0003f000) << 12
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x |= (a & 0x0000003f) << 16
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x |= (b & 0x0003f000) >> 4
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x |= (b & 0x0000003f)
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cook << x
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end
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cook
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end
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SP1 = [
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0x01010400, 0x00000000, 0x00010000, 0x01010404,
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0x01010004, 0x00010404, 0x00000004, 0x00010000,
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0x00000400, 0x01010400, 0x01010404, 0x00000400,
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0x01000404, 0x01010004, 0x01000000, 0x00000004,
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0x00000404, 0x01000400, 0x01000400, 0x00010400,
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0x00010400, 0x01010000, 0x01010000, 0x01000404,
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0x00010004, 0x01000004, 0x01000004, 0x00010004,
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0x00000000, 0x00000404, 0x00010404, 0x01000000,
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0x00010000, 0x01010404, 0x00000004, 0x01010000,
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0x01010400, 0x01000000, 0x01000000, 0x00000400,
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0x01010004, 0x00010000, 0x00010400, 0x01000004,
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0x00000400, 0x00000004, 0x01000404, 0x00010404,
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0x01010404, 0x00010004, 0x01010000, 0x01000404,
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0x01000004, 0x00000404, 0x00010404, 0x01010400,
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0x00000404, 0x01000400, 0x01000400, 0x00000000,
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0x00010004, 0x00010400, 0x00000000, 0x01010004
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]
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SP2 = [
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0x80108020, 0x80008000, 0x00008000, 0x00108020,
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0x00100000, 0x00000020, 0x80100020, 0x80008020,
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0x80000020, 0x80108020, 0x80108000, 0x80000000,
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0x80008000, 0x00100000, 0x00000020, 0x80100020,
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0x00108000, 0x00100020, 0x80008020, 0x00000000,
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0x80000000, 0x00008000, 0x00108020, 0x80100000,
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0x00100020, 0x80000020, 0x00000000, 0x00108000,
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0x00008020, 0x80108000, 0x80100000, 0x00008020,
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0x00000000, 0x00108020, 0x80100020, 0x00100000,
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0x80008020, 0x80100000, 0x80108000, 0x00008000,
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0x80100000, 0x80008000, 0x00000020, 0x80108020,
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0x00108020, 0x00000020, 0x00008000, 0x80000000,
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0x00008020, 0x80108000, 0x00100000, 0x80000020,
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0x00100020, 0x80008020, 0x80000020, 0x00100020,
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0x00108000, 0x00000000, 0x80008000, 0x00008020,
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0x80000000, 0x80100020, 0x80108020, 0x00108000
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]
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SP3 = [
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0x00000208, 0x08020200, 0x00000000, 0x08020008,
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0x08000200, 0x00000000, 0x00020208, 0x08000200,
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0x00020008, 0x08000008, 0x08000008, 0x00020000,
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0x08020208, 0x00020008, 0x08020000, 0x00000208,
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0x08000000, 0x00000008, 0x08020200, 0x00000200,
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0x00020200, 0x08020000, 0x08020008, 0x00020208,
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0x08000208, 0x00020200, 0x00020000, 0x08000208,
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0x00000008, 0x08020208, 0x00000200, 0x08000000,
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0x08020200, 0x08000000, 0x00020008, 0x00000208,
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0x00020000, 0x08020200, 0x08000200, 0x00000000,
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0x00000200, 0x00020008, 0x08020208, 0x08000200,
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0x08000008, 0x00000200, 0x00000000, 0x08020008,
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0x08000208, 0x00020000, 0x08000000, 0x08020208,
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0x00000008, 0x00020208, 0x00020200, 0x08000008,
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0x08020000, 0x08000208, 0x00000208, 0x08020000,
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0x00020208, 0x00000008, 0x08020008, 0x00020200
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]
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SP4 = [
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802080, 0x00800081, 0x00800001, 0x00002001,
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0x00000000, 0x00802000, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00800080, 0x00800001,
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0x00000001, 0x00002000, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002001, 0x00002080,
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0x00800081, 0x00000001, 0x00002080, 0x00800080,
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0x00002000, 0x00802080, 0x00802081, 0x00000081,
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0x00800080, 0x00800001, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00000000, 0x00802000,
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0x00002080, 0x00800080, 0x00800081, 0x00000001,
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802081, 0x00000081, 0x00000001, 0x00002000,
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0x00800001, 0x00002001, 0x00802080, 0x00800081,
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0x00002001, 0x00002080, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002000, 0x00802080
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]
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SP5 = [
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0x00000100, 0x02080100, 0x02080000, 0x42000100,
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0x00080000, 0x00000100, 0x40000000, 0x02080000,
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0x40080100, 0x00080000, 0x02000100, 0x40080100,
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0x42000100, 0x42080000, 0x00080100, 0x40000000,
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0x02000000, 0x40080000, 0x40080000, 0x00000000,
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0x40000100, 0x42080100, 0x42080100, 0x02000100,
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0x42080000, 0x40000100, 0x00000000, 0x42000000,
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0x02080100, 0x02000000, 0x42000000, 0x00080100,
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0x00080000, 0x42000100, 0x00000100, 0x02000000,
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0x40000000, 0x02080000, 0x42000100, 0x40080100,
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0x02000100, 0x40000000, 0x42080000, 0x02080100,
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0x40080100, 0x00000100, 0x02000000, 0x42080000,
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0x42080100, 0x00080100, 0x42000000, 0x42080100,
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0x02080000, 0x00000000, 0x40080000, 0x42000000,
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0x00080100, 0x02000100, 0x40000100, 0x00080000,
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0x00000000, 0x40080000, 0x02080100, 0x40000100
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]
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SP6 = [
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0x20000010, 0x20400000, 0x00004000, 0x20404010,
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0x20400000, 0x00000010, 0x20404010, 0x00400000,
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0x20004000, 0x00404010, 0x00400000, 0x20000010,
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0x00400010, 0x20004000, 0x20000000, 0x00004010,
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0x00000000, 0x00400010, 0x20004010, 0x00004000,
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0x00404000, 0x20004010, 0x00000010, 0x20400010,
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0x20400010, 0x00000000, 0x00404010, 0x20404000,
|
||
|
|
0x00004010, 0x00404000, 0x20404000, 0x20000000,
|
||
|
|
0x20004000, 0x00000010, 0x20400010, 0x00404000,
|
||
|
|
0x20404010, 0x00400000, 0x00004010, 0x20000010,
|
||
|
|
0x00400000, 0x20004000, 0x20000000, 0x00004010,
|
||
|
|
0x20000010, 0x20404010, 0x00404000, 0x20400000,
|
||
|
|
0x00404010, 0x20404000, 0x00000000, 0x20400010,
|
||
|
|
0x00000010, 0x00004000, 0x20400000, 0x00404010,
|
||
|
|
0x00004000, 0x00400010, 0x20004010, 0x00000000,
|
||
|
|
0x20404000, 0x20000000, 0x00400010, 0x20004010
|
||
|
|
]
|
||
|
|
|
||
|
|
SP7 = [
|
||
|
|
0x00200000, 0x04200002, 0x04000802, 0x00000000,
|
||
|
|
0x00000800, 0x04000802, 0x00200802, 0x04200800,
|
||
|
|
0x04200802, 0x00200000, 0x00000000, 0x04000002,
|
||
|
|
0x00000002, 0x04000000, 0x04200002, 0x00000802,
|
||
|
|
0x04000800, 0x00200802, 0x00200002, 0x04000800,
|
||
|
|
0x04000002, 0x04200000, 0x04200800, 0x00200002,
|
||
|
|
0x04200000, 0x00000800, 0x00000802, 0x04200802,
|
||
|
|
0x00200800, 0x00000002, 0x04000000, 0x00200800,
|
||
|
|
0x04000000, 0x00200800, 0x00200000, 0x04000802,
|
||
|
|
0x04000802, 0x04200002, 0x04200002, 0x00000002,
|
||
|
|
0x00200002, 0x04000000, 0x04000800, 0x00200000,
|
||
|
|
0x04200800, 0x00000802, 0x00200802, 0x04200800,
|
||
|
|
0x00000802, 0x04000002, 0x04200802, 0x04200000,
|
||
|
|
0x00200800, 0x00000000, 0x00000002, 0x04200802,
|
||
|
|
0x00000000, 0x00200802, 0x04200000, 0x00000800,
|
||
|
|
0x04000002, 0x04000800, 0x00000800, 0x00200002
|
||
|
|
]
|
||
|
|
|
||
|
|
SP8 = [
|
||
|
|
0x10001040, 0x00001000, 0x00040000, 0x10041040,
|
||
|
|
0x10000000, 0x10001040, 0x00000040, 0x10000000,
|
||
|
|
0x00040040, 0x10040000, 0x10041040, 0x00041000,
|
||
|
|
0x10041000, 0x00041040, 0x00001000, 0x00000040,
|
||
|
|
0x10040000, 0x10000040, 0x10001000, 0x00001040,
|
||
|
|
0x00041000, 0x00040040, 0x10040040, 0x10041000,
|
||
|
|
0x00001040, 0x00000000, 0x00000000, 0x10040040,
|
||
|
|
0x10000040, 0x10001000, 0x00041040, 0x00040000,
|
||
|
|
0x00041040, 0x00040000, 0x10041000, 0x00001000,
|
||
|
|
0x00000040, 0x10040040, 0x00001000, 0x00041040,
|
||
|
|
0x10001000, 0x00000040, 0x10000040, 0x10040000,
|
||
|
|
0x10040040, 0x10000000, 0x00040000, 0x10001040,
|
||
|
|
0x00000000, 0x10041040, 0x00040040, 0x10000040,
|
||
|
|
0x10040000, 0x10001000, 0x10001040, 0x00000000,
|
||
|
|
0x10041040, 0x00041000, 0x00041000, 0x00001040,
|
||
|
|
0x00001040, 0x00040040, 0x10000000, 0x10041000
|
||
|
|
]
|
||
|
|
|
||
|
|
def desfunc block, keys
|
||
|
|
leftt = block[0]
|
||
|
|
right = block[1]
|
||
|
|
|
||
|
|
work = ((leftt >> 4) ^ right) & 0x0f0f0f0f
|
||
|
|
right ^= work
|
||
|
|
leftt ^= (work << 4)
|
||
|
|
work = ((leftt >> 16) ^ right) & 0x0000ffff
|
||
|
|
right ^= work
|
||
|
|
leftt ^= (work << 16)
|
||
|
|
work = ((right >> 2) ^ leftt) & 0x33333333
|
||
|
|
leftt ^= work
|
||
|
|
right ^= (work << 2)
|
||
|
|
work = ((right >> 8) ^ leftt) & 0x00ff00ff
|
||
|
|
leftt ^= work
|
||
|
|
right ^= (work << 8)
|
||
|
|
right = ((right << 1) | ((right >> 31) & 1)) & 0xffffffff
|
||
|
|
work = (leftt ^ right) & 0xaaaaaaaa
|
||
|
|
leftt ^= work
|
||
|
|
right ^= work
|
||
|
|
leftt = ((leftt << 1) | ((leftt >> 31) & 1)) & 0xffffffff
|
||
|
|
|
||
|
|
8.times do |i|
|
||
|
|
work = (right << 28) | (right >> 4)
|
||
|
|
work ^= keys[i * 4 + 0]
|
||
|
|
fval = SP7[ work & 0x3f]
|
||
|
|
fval |= SP5[(work >> 8) & 0x3f]
|
||
|
|
fval |= SP3[(work >> 16) & 0x3f]
|
||
|
|
fval |= SP1[(work >> 24) & 0x3f]
|
||
|
|
work = right ^ keys[i * 4 + 1]
|
||
|
|
fval |= SP8[ work & 0x3f]
|
||
|
|
fval |= SP6[(work >> 8) & 0x3f]
|
||
|
|
fval |= SP4[(work >> 16) & 0x3f]
|
||
|
|
fval |= SP2[(work >> 24) & 0x3f]
|
||
|
|
leftt ^= fval
|
||
|
|
work = (leftt << 28) | (leftt >> 4)
|
||
|
|
work ^= keys[i * 4 + 2]
|
||
|
|
fval = SP7[ work & 0x3f]
|
||
|
|
fval |= SP5[(work >> 8) & 0x3f]
|
||
|
|
fval |= SP3[(work >> 16) & 0x3f]
|
||
|
|
fval |= SP1[(work >> 24) & 0x3f]
|
||
|
|
work = leftt ^ keys[i * 4 + 3]
|
||
|
|
fval |= SP8[ work & 0x3f]
|
||
|
|
fval |= SP6[(work >> 8) & 0x3f]
|
||
|
|
fval |= SP4[(work >> 16) & 0x3f]
|
||
|
|
fval |= SP2[(work >> 24) & 0x3f]
|
||
|
|
right ^= fval
|
||
|
|
end
|
||
|
|
|
||
|
|
right = ((right << 31) | (right >> 1)) & 0xffffffff
|
||
|
|
work = (leftt ^ right) & 0xaaaaaaaa
|
||
|
|
leftt ^= work
|
||
|
|
right ^= work
|
||
|
|
leftt = ((leftt << 31) | (leftt >> 1)) & 0xffffffff
|
||
|
|
work = ((leftt >> 8) ^ right) & 0x00ff00ff
|
||
|
|
right ^= work
|
||
|
|
leftt ^= (work << 8)
|
||
|
|
work = ((leftt >> 2) ^ right) & 0x33333333
|
||
|
|
right ^= work
|
||
|
|
leftt ^= (work << 2)
|
||
|
|
work = ((right >> 16) ^ leftt) & 0x0000ffff
|
||
|
|
leftt ^= work
|
||
|
|
right ^= (work << 16)
|
||
|
|
work = ((right >> 4) ^ leftt) & 0x0f0f0f0f
|
||
|
|
leftt ^= work
|
||
|
|
right ^= (work << 4)
|
||
|
|
|
||
|
|
[right, leftt]
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|