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- {******************************************************************************}
- {* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
- {******************************************************************************}
- {* A binary compatible implementation of MD4 **********************************}
- {******************************************************************************}
- {* Copyright (c) 1999-2002 David Barton *}
- {* Permission is hereby granted, free of charge, to any person obtaining a *}
- {* copy of this software and associated documentation files (the "Software"), *}
- {* to deal in the Software without restriction, including without limitation *}
- {* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
- {* and/or sell copies of the Software, and to permit persons to whom the *}
- {* Software is furnished to do so, subject to the following conditions: *}
- {* *}
- {* The above copyright notice and this permission notice shall be included in *}
- {* all copies or substantial portions of the Software. *}
- {* *}
- {* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
- {* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
- {* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
- {* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
- {* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
- {* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
- {* DEALINGS IN THE SOFTWARE. *}
- {******************************************************************************}
- unit DCPmd4;
-
- interface
- uses
- Classes, Sysutils, DCPcrypt2, DCPconst;
-
- type
- TDCP_md4= class(TDCP_hash)
- protected
- LenHi, LenLo: longword;
- Index: DWord;
- CurrentHash: array[0..3] of DWord;
- HashBuffer: array[0..63] of byte;
- procedure Compress;
- public
- class function GetId: integer; override;
- class function GetAlgorithm: string; override;
- class function GetHashSize: integer; override;
- class function SelfTest: boolean; override;
- procedure Init; override;
- procedure Burn; override;
- procedure Update(const Buffer; Size: longword); override;
- procedure Final(var Digest); override;
- end;
-
-
-
- {******************************************************************************}
- {******************************************************************************}
- implementation
- {$R-}{$Q-}
-
- function LRot32(a, b: longword): longword;
- begin
- Result:= (a shl b) or (a shr (32-b));
- end;
-
- procedure TDCP_md4.Compress;
- var
- Data: array[0..15] of dword;
- A, B, C, D: dword;
- begin
- Move(HashBuffer,Data,Sizeof(Data));
- A:= CurrentHash[0];
- B:= CurrentHash[1];
- C:= CurrentHash[2];
- D:= CurrentHash[3];
-
- A:= LRot32(A + (D xor (B and (C xor D))) + Data[ 0],3);
- D:= LRot32(D + (C xor (A and (B xor C))) + Data[ 1],7);
- C:= LRot32(C + (B xor (D and (A xor B))) + Data[ 2],11);
- B:= LRot32(B + (A xor (C and (D xor A))) + Data[ 3],19);
- A:= LRot32(A + (D xor (B and (C xor D))) + Data[ 4],3);
- D:= LRot32(D + (C xor (A and (B xor C))) + Data[ 5],7);
- C:= LRot32(C + (B xor (D and (A xor B))) + Data[ 6],11);
- B:= LRot32(B + (A xor (C and (D xor A))) + Data[ 7],19);
- A:= LRot32(A + (D xor (B and (C xor D))) + Data[ 8],3);
- D:= LRot32(D + (C xor (A and (B xor C))) + Data[ 9],7);
- C:= LRot32(C + (B xor (D and (A xor B))) + Data[10],11);
- B:= LRot32(B + (A xor (C and (D xor A))) + Data[11],19);
- A:= LRot32(A + (D xor (B and (C xor D))) + Data[12],3);
- D:= LRot32(D + (C xor (A and (B xor C))) + Data[13],7);
- C:= LRot32(C + (B xor (D and (A xor B))) + Data[14],11);
- B:= LRot32(B + (A xor (C and (D xor A))) + Data[15],19);
-
- A:= LRot32(A + ((B and C) or (B and D) or (C and D)) + Data[ 0] + $5a827999,3);
- D:= LRot32(D + ((A and B) or (A and C) or (B and C)) + Data[ 4] + $5a827999,5);
- C:= LRot32(C + ((D and A) or (D and B) or (A and B)) + Data[ 8] + $5a827999,9);
- B:= LRot32(B + ((C and D) or (C and A) or (D and A)) + Data[12] + $5a827999,13);
- A:= LRot32(A + ((B and C) or (B and D) or (C and D)) + Data[ 1] + $5a827999,3);
- D:= LRot32(D + ((A and B) or (A and C) or (B and C)) + Data[ 5] + $5a827999,5);
- C:= LRot32(C + ((D and A) or (D and B) or (A and B)) + Data[ 9] + $5a827999,9);
- B:= LRot32(B + ((C and D) or (C and A) or (D and A)) + Data[13] + $5a827999,13);
- A:= LRot32(A + ((B and C) or (B and D) or (C and D)) + Data[ 2] + $5a827999,3);
- D:= LRot32(D + ((A and B) or (A and C) or (B and C)) + Data[ 6] + $5a827999,5);
- C:= LRot32(C + ((D and A) or (D and B) or (A and B)) + Data[10] + $5a827999,9);
- B:= LRot32(B + ((C and D) or (C and A) or (D and A)) + Data[14] + $5a827999,13);
- A:= LRot32(A + ((B and C) or (B and D) or (C and D)) + Data[ 3] + $5a827999,3);
- D:= LRot32(D + ((A and B) or (A and C) or (B and C)) + Data[ 7] + $5a827999,5);
- C:= LRot32(C + ((D and A) or (D and B) or (A and B)) + Data[11] + $5a827999,9);
- B:= LRot32(B + ((C and D) or (C and A) or (D and A)) + Data[15] + $5a827999,13);
-
- A:= LRot32(A + (B xor C xor D) + Data[ 0] + $6ed9eba1,3);
- D:= LRot32(D + (A xor B xor C) + Data[ 8] + $6ed9eba1,9);
- C:= LRot32(C + (D xor A xor B) + Data[ 4] + $6ed9eba1,11);
- B:= LRot32(B + (C xor D xor A) + Data[12] + $6ed9eba1,15);
- A:= LRot32(A + (B xor C xor D) + Data[ 2] + $6ed9eba1,3);
- D:= LRot32(D + (A xor B xor C) + Data[10] + $6ed9eba1,9);
- C:= LRot32(C + (D xor A xor B) + Data[ 6] + $6ed9eba1,11);
- B:= LRot32(B + (C xor D xor A) + Data[14] + $6ed9eba1,15);
- A:= LRot32(A + (B xor C xor D) + Data[ 1] + $6ed9eba1,3);
- D:= LRot32(D + (A xor B xor C) + Data[ 9] + $6ed9eba1,9);
- C:= LRot32(C + (D xor A xor B) + Data[ 5] + $6ed9eba1,11);
- B:= LRot32(B + (C xor D xor A) + Data[13] + $6ed9eba1,15);
- A:= LRot32(A + (B xor C xor D) + Data[ 3] + $6ed9eba1,3);
- D:= LRot32(D + (A xor B xor C) + Data[11] + $6ed9eba1,9);
- C:= LRot32(C + (D xor A xor B) + Data[ 7] + $6ed9eba1,11);
- B:= LRot32(B + (C xor D xor A) + Data[15] + $6ed9eba1,15);
-
- Inc(CurrentHash[0],A);
- Inc(CurrentHash[1],B);
- Inc(CurrentHash[2],C);
- Inc(CurrentHash[3],D);
- Index:= 0;
- FillChar(HashBuffer,Sizeof(HashBuffer),0);
- end;
-
- class function TDCP_md4.GetHashSize: integer;
- begin
- Result:= 128;
- end;
-
- class function TDCP_md4.GetId: integer;
- begin
- Result:= DCP_md4;
- end;
-
- class function TDCP_md4.GetAlgorithm: string;
- begin
- Result:= 'MD4';
- end;
-
- class function TDCP_md4.SelfTest: boolean;
- const
- Test1Out: array[0..15] of byte=
- ($a4,$48,$01,$7a,$af,$21,$d8,$52,$5f,$c1,$0a,$e8,$7a,$a6,$72,$9d);
- Test2Out: array[0..15] of byte=
- ($d7,$9e,$1c,$30,$8a,$a5,$bb,$cd,$ee,$a8,$ed,$63,$df,$41,$2d,$a9);
- var
- TestHash: TDCP_md4;
- TestOut: array[0..19] of byte;
- begin
- TestHash:= TDCP_md4.Create(nil);
- TestHash.Init;
- TestHash.UpdateStr('abc');
- TestHash.Final(TestOut);
- Result:= CompareMem(@TestOut,@Test1Out,Sizeof(Test1Out));
- TestHash.Init;
- TestHash.UpdateStr('abcdefghijklmnopqrstuvwxyz');
- TestHash.Final(TestOut);
- Result:= CompareMem(@TestOut,@Test2Out,Sizeof(Test2Out)) and Result;
- TestHash.Free;
- end;
-
- procedure TDCP_md4.Init;
- begin
- Burn;
- CurrentHash[0]:= $67452301;
- CurrentHash[1]:= $efcdab89;
- CurrentHash[2]:= $98badcfe;
- CurrentHash[3]:= $10325476;
- fInitialized:= true;
- end;
-
- procedure TDCP_md4.Burn;
- begin
- LenHi:= 0; LenLo:= 0;
- Index:= 0;
- FillChar(HashBuffer,Sizeof(HashBuffer),0);
- FillChar(CurrentHash,Sizeof(CurrentHash),0);
- fInitialized:= false;
- end;
-
- procedure TDCP_md4.Update(const Buffer; Size: longword);
- var
- PBuf: ^byte;
- begin
- if not fInitialized then
- raise EDCP_hash.Create('Hash not initialized');
-
- Inc(LenHi,Size shr 29);
- Inc(LenLo,Size*8);
- if LenLo< (Size*8) then
- Inc(LenHi);
-
- PBuf:= @Buffer;
- while Size> 0 do
- begin
- if (Sizeof(HashBuffer)-Index)<= DWord(Size) then
- begin
- Move(PBuf^,HashBuffer[Index],Sizeof(HashBuffer)-Index);
- Dec(Size,Sizeof(HashBuffer)-Index);
- Inc(PBuf,Sizeof(HashBuffer)-Index);
- Compress;
- end
- else
- begin
- Move(PBuf^,HashBuffer[Index],Size);
- Inc(Index,Size);
- Size:= 0;
- end;
- end;
- end;
-
- procedure TDCP_md4.Final(var Digest);
- begin
- if not fInitialized then
- raise EDCP_hash.Create('Hash not initialized');
- HashBuffer[Index]:= $80;
- if Index>= 56 then
- Compress;
- PDWord(@HashBuffer[56])^:= LenLo;
- PDWord(@HashBuffer[60])^:= LenHi;
- Compress;
- Move(CurrentHash,Digest,Sizeof(CurrentHash));
- Burn;
- end;
-
- end.
-