101 lines
2.7 KiB
Ruby
101 lines
2.7 KiB
Ruby
#!/usr/bin/ruby
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# shavs_test.rb
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=begin
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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=end
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shift_values = [ 5, 36, 13, 58, 26, 53, 11, 59,
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56, 28, 46, 44, 20, 35, 42, 50,
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38, 48, 34, 26, 33, 39, 29, 33,
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30, 20, 14, 12, 49, 27, 26, 51,
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50, 43, 15, 58, 8, 41, 11, 39,
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53, 31, 27, 7, 42, 14, 9, 35,
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55, 25, 33, 34, 28, 17, 58, 47,
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43, 25, 8, 43, 7, 6, 7, 49,
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37, 46, 18, 25, 47, 18, 32, 27,
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40, 13, 57, 60, 48, 25, 45, 58,
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16, 14, 21, 44, 51, 43, 19, 37,
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22, 13, 12, 9, 9, 42, 18, 48,
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38, 52, 32, 59, 35, 40, 2, 53,
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12, 57, 54, 34, 41, 15, 56, 56 ]
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def transform_shift(value)
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byteshift = (value+3)/8
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singleshift = value%8
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if singleshift>4
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# byteshift += 1
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singleshift -= 8
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end
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return [singleshift, byteshift]
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end
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def transform_singleshift(value)
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if(value>=0)
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return value
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end
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return 0x08+(value*-1)
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end
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bs_hist = Hash.new
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bs_hist.default = 0
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ss_hist = Hash.new
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ss_hist.default = 0
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shift_values.each{|v|
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a = transform_shift(v)
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printf("%2d = %2d * 8 %+2d\n", v, a[1], a[0])
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bs_hist[a[1]] += 1
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ss_hist[a[0]] += 1
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}
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puts("byteshift histogram:")
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for i in 0..7
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printf("%d: %4d\n", i, bs_hist[i])
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end
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puts("singleshift histogram:")
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for i in -3..4
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printf("%+d: %4d\n", i, ss_hist[i])
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end
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puts "\ntransformed:"
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(0..shift_values.length-1).each{|i|
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puts " for 256 bit:" if i==0
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puts " for 512 bit:" if i==16
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puts " for 1024 bit:" if i==16+32
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a = transform_shift(shift_values[i])
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a[0] = transform_singleshift(a[0])
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printf("0x%01x%01x, ", a[1], a[0])
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puts("") if (i%8==7)
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}
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puts "\ntransformed (decryption):"
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(0..shift_values.length-1).each{|i|
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puts " for 256 bit:" if i==0
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puts " for 512 bit:" if i==16
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puts " for 1024 bit:" if i==16+32
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a = transform_shift(shift_values[(i/8)*8+7-(i%8)])
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a[0] = transform_singleshift(a[0])
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printf("0x%01x%01x, ", a[1], a[0])
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puts("") if (i%8==7)
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}
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