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+{
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+ Translation of the SAMBA md4 code for FreePascal
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+ Copyright (C) 2006 by Ivo Steinmann
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+ Ported from SAMBA/source/lib/md4.c:
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+
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+ Unix SMB/CIFS implementation.
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+ a implementation of MD4 designed for use in the SMB authentication protocol
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+ Copyright (C) Andrew Tridgell 1997-1998.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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+}
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+
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+unit md4;
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+
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+{$mode objfpc}
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+
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+interface
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+
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+type
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+ TMD4Hash = packed array[0..15] of byte;
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+
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+// NOTE: _out is expected to be a 16 bytes array
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+procedure mdfour({out} var _out: TMD4Hash; {in} _in: PByte; {in} n: Integer); overload;
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+procedure mdfour({out} const _out: PByte; {in} _in: PByte; {in} n: Integer); overload;
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+
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+implementation
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+
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+procedure mdfour({out} var _out: TMD4Hash; {in} _in: PByte; {in} n: Integer);
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+begin
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+ mdfour(@_out, _in, n);
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+end;
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+
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+
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+(*
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+ * produce a md4 message digest from data of length n bytes
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+ *)
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+
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+procedure mdfour({out} const _out: PByte; {in} _in: PByte; {in} n: Integer);
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+var
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+ A, B, C, D: Longword;
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+
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+
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+ (* this applies md4 to 64 byte chunks *)
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+ procedure mdfour64({in} const M: PLongword);
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+
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+ function F(X, Y, Z: Longword): Longword; inline;
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+ begin
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+ Result := (X and Y) or ((not X) and Z)
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+ end;
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+
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+ function G(X, Y, Z: Longword): Longword; inline;
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+ begin
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+ Result := (X and Y) or (X and Z) or (Y and Z);
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+ end;
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+
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+ function H(X, Y, Z: Longword): Longword; inline;
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+ begin
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+ Result := X xor Y xor Z;
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+ end;
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+
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+ function lshift(X: Longword; S: Integer): Longword; inline;
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+ begin
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+ x := x and $FFFFFFFF;
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+ Result := ((x shl s) and $FFFFFFFF) or (x shr (32-s));
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+ end;
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+
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+ procedure ROUND1(var a: Longword; b, c, d, k: Longword; s: Integer); inline;
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+ begin
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+ a := lshift(a + F(b,c,d) + M[k], s);
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+ end;
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+
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+ procedure ROUND2(var a: Longword; b, c, d, k: Longword; s: Integer); inline;
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+ begin
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+ a := lshift(a + G(b,c,d) + M[k] + $5A827999, s);
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+ end;
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+
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+ procedure ROUND3(var a: Longword; b, c, d, k: Longword; s: Integer); inline;
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+ begin
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+ a := lshift(a + H(b,c,d) + M[k] + $6ED9EBA1, s);
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+ end;
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+
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+ var
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+ AA : Longword;
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+ BB : Longword;
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+ CC : Longword;
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+ DD : Longword;
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+ begin
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+ AA := A;
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+ BB := B;
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+ CC := C;
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+ DD := D;
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+
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+ ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
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+ ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
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+ ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
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+ ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
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+ ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
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+ ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
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+ ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
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+ ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
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+
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+ ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
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+ ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
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+ ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
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+ ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
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+ ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
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+ ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
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+ ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
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+ ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
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+
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+ ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
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+ ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
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+ ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
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+ ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
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+ ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
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+ ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
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+ ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
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+ ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
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+
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+ A := A + AA;
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+ B := B + BB;
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+ C := C + CC;
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+ D := D + DD;
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+ end;
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+
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+ procedure copy64({out} const M: PLongword; {in} const _in: PByte);
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+ var
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+ i: Integer;
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+ begin
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+ for i := 0 to 15 do
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+ M[i] := (_in[i*4+3] shl 24) or (_in[i*4+2] shl 16) or (_in[i*4+1] shl 8) or (_in[i*4+0] shl 0);
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+ end;
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+
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+ procedure copy4({out} const _out: PByte; {in} const x: Longword);
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+ begin
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+ _out[0] := x and $FF;
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+ _out[1] := (x shr 8) and $FF;
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+ _out[2] := (x shr 16) and $FF;
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+ _out[3] := (x shr 24) and $FF;
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+ end;
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+
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+var
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+ buf : array[0..127] of Byte;
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+ M : array[0..15] of Longword;
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+ bb : Longword;
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+begin
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+ bb := n * 8;
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+
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+ A := $67452301;
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+ B := $efcdab89;
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+ C := $98badcfe;
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+ D := $10325476;
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+
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+ while n > 64 do
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+ begin
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+ copy64(@M, _in);
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+ mdfour64(@M);
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+ Inc(_in, 64);
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+ Dec(n, 64);
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+ end;
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+
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+ FillChar(buf, sizeof(buf), 0);
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+ Move(_in[0], buf, n);
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+ buf[n] := $80;
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+
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+ if n <= 55 then
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+ begin
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+ copy4(@buf[56], bb);
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+ copy64(@M, @buf);
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+ mdfour64(@M);
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+ end else begin
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+ copy4(@buf[120], bb);
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+ copy64(@M, @buf);
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+ mdfour64(@M);
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+ copy64(@M, @buf[64]);
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+ mdfour64(@M);
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+ end;
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+
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+ FillChar(buf, sizeof(buf), 0);
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+ copy64(@M, @buf);
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+
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+ copy4(@_out[0], A);
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+ copy4(@_out[4], B);
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+ copy4(@_out[8], C);
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+ copy4(@_out[12], D);
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+end;
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+
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+end.
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ivost