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// ======================================================================
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// DES encryption/decryption
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// package file with functions
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// Copyright (C) 2012 Torsten Meissner
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//-----------------------------------------------------------------------
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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 2 of the License, or
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// (at your option) any later version.
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//
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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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//
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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, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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// ======================================================================
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function [0:63] ip (input [0:63] data);
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begin
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ip = {data[57], data[49], data[41], data[33], data[25], data[17], data[ 9], data[1],
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data[59], data[51], data[43], data[35], data[27], data[19], data[11], data[3],
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data[61], data[53], data[45], data[37], data[29], data[21], data[13], data[5],
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data[63], data[55], data[47], data[39], data[31], data[23], data[15], data[7],
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data[56], data[48], data[40], data[32], data[24], data[16], data[ 8], data[0],
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data[58], data[50], data[42], data[34], data[26], data[18], data[10], data[2],
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data[60], data[52], data[44], data[36], data[28], data[20], data[12], data[4],
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data[62], data[54], data[46], data[38], data[30], data[22], data[14], data[6]};
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end
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endfunction
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function [0:63] ipn (input [0:63] data);
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begin
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ipn = {data[39], data[7], data[47], data[15], data[55], data[23], data[63], data[31],
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data[38], data[6], data[46], data[14], data[54], data[22], data[62], data[30],
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data[37], data[5], data[45], data[13], data[53], data[21], data[61], data[29],
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data[36], data[4], data[44], data[12], data[52], data[20], data[60], data[28],
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data[35], data[3], data[43], data[11], data[51], data[19], data[59], data[27],
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data[34], data[2], data[42], data[10], data[50], data[18], data[58], data[26],
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data[33], data[1], data[41], data[ 9], data[49], data[17], data[57], data[25],
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data[32], data[0], data[40], data[ 8], data[48], data[16], data[56], data[24]};
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end
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endfunction
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function [0:47] e (input [0:31] data);
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begin
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e = {data[31], data[ 0], data[ 1], data[ 2], data[ 3], data[ 4],
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data[ 3], data[ 4], data[ 5], data[ 6], data[ 7], data[ 8],
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data[ 7], data[ 8], data[ 9], data[10], data[11], data[12],
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data[11], data[12], data[13], data[14], data[15], data[16],
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data[15], data[16], data[17], data[18], data[19], data[20],
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data[19], data[20], data[21], data[22], data[23], data[24],
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data[23], data[24], data[25], data[26], data[27], data[28],
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data[27], data[28], data[29], data[30], data[31], data[ 0]};
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end
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endfunction
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