183 lines
7.1 KiB
ObjectPascal
183 lines
7.1 KiB
ObjectPascal
{******************************************************************************}
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{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
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{******************************************************************************}
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{* A binary compatible (with Total Commander) implementation of SFV *}
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{******************************************************************************}
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{* Copyright (C) 2011 Alexander Koblov (alexx2000@mail.ru) *}
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{* Permission is hereby granted, free of charge, to any person obtaining a *}
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{* copy of this software and associated documentation files (the "Software"), *}
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{* to deal in the Software without restriction, including without limitation *}
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{* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
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{* and/or sell copies of the Software, and to permit persons to whom the *}
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{* Software is furnished to do so, subject to the following conditions: *}
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{* *}
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{* The above copyright notice and this permission notice shall be included in *}
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{* all copies or substantial portions of the Software. *}
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{* *}
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{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
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{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
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{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
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{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
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{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
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{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
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{* DEALINGS IN THE SOFTWARE. *}
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{******************************************************************************}
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unit DCPsfv;
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{$mode objfpc}{$h+}
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interface
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uses
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Classes, Sysutils, DCPcrypt2, DCPconst;
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type
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TDCP_sfv = class(TDCP_hash)
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protected
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CurrentHash: LongWord;
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public
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class function GetId: integer; override;
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class function GetAlgorithm: string; override;
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class function GetHashSize: integer; override;
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class function SelfTest: boolean; override;
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procedure Init; override;
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procedure Burn; override;
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procedure Update(const Buffer; Size: longword); override;
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procedure Final(var Digest); override;
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end;
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{******************************************************************************}
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{******************************************************************************}
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implementation
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{$R-}{$Q-}
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const
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sfv_table : array[Byte] of cardinal = (
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$00000000, $77073096, $ee0e612c, $990951ba, $076dc419,
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$706af48f, $e963a535, $9e6495a3, $0edb8832, $79dcb8a4,
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$e0d5e91e, $97d2d988, $09b64c2b, $7eb17cbd, $e7b82d07,
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$90bf1d91, $1db71064, $6ab020f2, $f3b97148, $84be41de,
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$1adad47d, $6ddde4eb, $f4d4b551, $83d385c7, $136c9856,
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$646ba8c0, $fd62f97a, $8a65c9ec, $14015c4f, $63066cd9,
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$fa0f3d63, $8d080df5, $3b6e20c8, $4c69105e, $d56041e4,
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$a2677172, $3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b,
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$35b5a8fa, $42b2986c, $dbbbc9d6, $acbcf940, $32d86ce3,
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$45df5c75, $dcd60dcf, $abd13d59, $26d930ac, $51de003a,
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$c8d75180, $bfd06116, $21b4f4b5, $56b3c423, $cfba9599,
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$b8bda50f, $2802b89e, $5f058808, $c60cd9b2, $b10be924,
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$2f6f7c87, $58684c11, $c1611dab, $b6662d3d, $76dc4190,
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$01db7106, $98d220bc, $efd5102a, $71b18589, $06b6b51f,
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$9fbfe4a5, $e8b8d433, $7807c9a2, $0f00f934, $9609a88e,
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$e10e9818, $7f6a0dbb, $086d3d2d, $91646c97, $e6635c01,
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$6b6b51f4, $1c6c6162, $856530d8, $f262004e, $6c0695ed,
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$1b01a57b, $8208f4c1, $f50fc457, $65b0d9c6, $12b7e950,
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$8bbeb8ea, $fcb9887c, $62dd1ddf, $15da2d49, $8cd37cf3,
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$fbd44c65, $4db26158, $3ab551ce, $a3bc0074, $d4bb30e2,
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$4adfa541, $3dd895d7, $a4d1c46d, $d3d6f4fb, $4369e96a,
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$346ed9fc, $ad678846, $da60b8d0, $44042d73, $33031de5,
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$aa0a4c5f, $dd0d7cc9, $5005713c, $270241aa, $be0b1010,
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$c90c2086, $5768b525, $206f85b3, $b966d409, $ce61e49f,
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$5edef90e, $29d9c998, $b0d09822, $c7d7a8b4, $59b33d17,
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$2eb40d81, $b7bd5c3b, $c0ba6cad, $edb88320, $9abfb3b6,
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$03b6e20c, $74b1d29a, $ead54739, $9dd277af, $04db2615,
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$73dc1683, $e3630b12, $94643b84, $0d6d6a3e, $7a6a5aa8,
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$e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1, $f00f9344,
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$8708a3d2, $1e01f268, $6906c2fe, $f762575d, $806567cb,
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$196c3671, $6e6b06e7, $fed41b76, $89d32be0, $10da7a5a,
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$67dd4acc, $f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5,
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$d6d6a3e8, $a1d1937e, $38d8c2c4, $4fdff252, $d1bb67f1,
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$a6bc5767, $3fb506dd, $48b2364b, $d80d2bda, $af0a1b4c,
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$36034af6, $41047a60, $df60efc3, $a867df55, $316e8eef,
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$4669be79, $cb61b38c, $bc66831a, $256fd2a0, $5268e236,
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$cc0c7795, $bb0b4703, $220216b9, $5505262f, $c5ba3bbe,
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$b2bd0b28, $2bb45a92, $5cb36a04, $c2d7ffa7, $b5d0cf31,
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$2cd99e8b, $5bdeae1d, $9b64c2b0, $ec63f226, $756aa39c,
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$026d930a, $9c0906a9, $eb0e363f, $72076785, $05005713,
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$95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38, $92d28e9b,
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$e5d5be0d, $7cdcefb7, $0bdbdf21, $86d3d2d4, $f1d4e242,
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$68ddb3f8, $1fda836e, $81be16cd, $f6b9265b, $6fb077e1,
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$18b74777, $88085ae6, $ff0f6a70, $66063bca, $11010b5c,
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$8f659eff, $f862ae69, $616bffd3, $166ccf45, $a00ae278,
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$d70dd2ee, $4e048354, $3903b3c2, $a7672661, $d06016f7,
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$4969474d, $3e6e77db, $aed16a4a, $d9d65adc, $40df0b66,
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$37d83bf0, $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9,
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$bdbdf21c, $cabac28a, $53b39330, $24b4a3a6, $bad03605,
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$cdd70693, $54de5729, $23d967bf, $b3667a2e, $c4614ab8,
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$5d681b02, $2a6f2b94, $b40bbe37, $c30c8ea1, $5a05df1b,
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$2d02ef8d);
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class function TDCP_sfv.GetHashSize: integer;
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begin
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Result:= 32;
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end;
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class function TDCP_sfv.GetId: integer;
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begin
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Result:= DCP_sfv;
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end;
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class function TDCP_sfv.GetAlgorithm: string;
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begin
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Result:= 'SFV';
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end;
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class function TDCP_sfv.SelfTest: boolean;
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const
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Test1Out: array[0..3] of byte=($35,$24,$41,$C2);
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Test2Out: array[0..3] of byte=($4C,$27,$50,$BD);
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var
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TestHash: TDCP_sfv;
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TestOut: array[0..3] of byte;
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begin
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dcpFillChar(TestOut, SizeOf(TestOut), 0);
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TestHash:= TDCP_sfv.Create(nil);
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TestHash.Init;
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TestHash.UpdateStr('abc');
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TestHash.Final(TestOut);
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Result:= CompareMem(@TestOut,@Test1Out,Sizeof(Test1Out));
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TestHash.Init;
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TestHash.UpdateStr('abcdefghijklmnopqrstuvwxyz');
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TestHash.Final(TestOut);
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Result:= CompareMem(@TestOut,@Test2Out,Sizeof(Test2Out)) and Result;
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TestHash.Free;
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end;
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procedure TDCP_sfv.Init;
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begin
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Burn;
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CurrentHash:= $FFFFFFFF;
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fInitialized:= true;
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end;
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procedure TDCP_sfv.Burn;
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begin
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CurrentHash:= 0;
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fInitialized:= false;
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end;
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procedure TDCP_sfv.Update(const Buffer; Size: longword);
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var
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I: LongWord;
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Bytes: PByte;
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begin
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Bytes:= @Buffer;
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for I:= 0 to Size - 1 do
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begin
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CurrentHash:= ((CurrentHash shr 8) and $00FFFFFF) xor
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(sfv_table[(CurrentHash xor Bytes[I]) and $000000FF]);
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end;
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end;
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procedure TDCP_sfv.Final(var Digest);
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begin
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if not fInitialized then
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raise EDCP_hash.Create('Hash not initialized');
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CurrentHash:= not CurrentHash;
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CurrentHash:= SwapEndian(CurrentHash);
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Move(CurrentHash,Digest,Sizeof(CurrentHash));
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Burn;
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end;
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end.
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