hedgewars/uSHA.pas
author nemo
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2007 Andrey Korotaev <unC0Rr@gmail.com>
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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; version 2 of the License
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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unit uSHA;
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interface
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uses SDLh;
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type TSHA1Context = packed record
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                    H: array[0..4] of LongWord;
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                    Length, CurrLength: Int64;
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                    Buf: array[0..63] of byte;
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                    end;
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     TSHA1Digest =  array[0..4] of LongWord;
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procedure SHA1Init(var Context: TSHA1Context);
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procedure SHA1Update(var Context: TSHA1Context; Buf: PByteArray; Length: LongWord);
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procedure SHA1UpdateLongwords(var Context: TSHA1Context; Buf: PLongwordArray; Length: LongWord);
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function  SHA1Final(Context: TSHA1Context): TSHA1Digest;
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implementation
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function rol(x: LongWord; y: Byte): LongWord;
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begin
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  rol:= (X shl y) or (X shr (32 - y))
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end;
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function Ft(t, b, c, d: LongWord): LongWord;
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begin
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case t of
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      0..19: Ft := (b and c) or ((not b) and d);
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     20..39: Ft :=  b xor c xor d;
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     40..59: Ft := (b and c) or (b and d) or (c and d);
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     else    Ft :=  b xor c xor d;
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  end;
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end;
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function Kt(t: Byte): LongWord;
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begin
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  case t of
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     0..19: Kt := $5A827999;
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    20..39: Kt := $6ED9EBA1;
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    40..59: Kt := $8F1BBCDC;
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  else
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    Kt := $CA62C1D6
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  end;
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end;
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procedure SHA1Hash(var Context: TSHA1Context);
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var S: array[0..4 ] of LongWord;
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    W: array[0..79] of LongWord;
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    i, t: LongWord;
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begin
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move(Context.H, S, sizeof(S));
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for i:= 0 to 15 do
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    SDLNet_Write32(PLongWordArray(@Context.Buf)^[i], @W[i]);
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for i := 16 to 79 do
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    W[i] := rol(W[i - 3] xor W[i - 8] xor W[i - 14] xor W[i - 16], 1);
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for i := 0 to 79 do
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    begin
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    t:= rol(S[0], 5) + Ft(i, S[1], S[2], S[3]) + S[4] + W[i] + Kt(i);
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    S[4]:= S[3];
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    S[3]:= S[2];
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    S[2]:= rol(S[1], 30);
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    S[1]:= S[0];
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    S[0]:= t
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    end;
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for i := 0 to 4 do
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    Context.H[i]:= Context.H[i] + S[i]
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end;
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procedure SHA1Init(var Context: TSHA1Context);
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begin
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  with Context do
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       begin
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       Length    := 0;
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       CurrLength:= 0;
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       H[0]:= $67452301;
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       H[1]:= $EFCDAB89;
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       H[2]:= $98BADCFE;
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       H[3]:= $10325476;
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       H[4]:= $C3D2E1F0
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  end
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end;
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procedure SHA1Update(var Context: TSHA1Context; Buf: PByteArray; Length: LongWord);
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var i: Longword;
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begin
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for i:= 0 to Pred(Length) do
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    begin
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    Context.Buf[Context.CurrLength]:= Buf^[i];
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    inc(Context.CurrLength);
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    if Context.CurrLength = 64 then
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       begin
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       SHA1Hash(Context);
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       inc(Context.Length, 512);
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       Context.CurrLength:= 0
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       end
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    end
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end;
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procedure SHA1UpdateLongwords(var Context: TSHA1Context; Buf: PLongwordArray; Length: LongWord);
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var i: Longword;
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begin
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for i:= 0 to Pred(Length div 4) do
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    begin
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    SDLNet_Write32(Buf^[i], @Context.Buf[Context.CurrLength]);
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    inc(Context.CurrLength, 4);
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    if Context.CurrLength = 64 then
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       begin
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       SHA1Hash(Context);
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       inc(Context.Length, 512);
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       Context.CurrLength:= 0
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       end
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    end
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end;
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function  SHA1Final(Context: TSHA1Context): TSHA1Digest;
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var i: LongWord;
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begin
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Context.Length:= Context.Length + Context.CurrLength shl 3;
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Context.Buf[Context.CurrLength]:= $80;
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inc(Context.CurrLength);
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if Context.CurrLength > 56 then
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   begin
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   FillChar(Context.Buf[Context.CurrLength], 64 - Context.CurrLength, 0);
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   Context.CurrLength:= 64;
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   SHA1Hash(Context);
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   Context.CurrLength:=0
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   end;
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FillChar(Context.Buf[Context.CurrLength], 56 - Context.CurrLength, 0);
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for i:= 56 to 63 do
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    Context.Buf[i] := (Context.Length shr ((63 - i) * 8)) and $FF;
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SHA1Hash(Context);
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for i:= 0 to 4 do SHA1Final[i]:= Context.H[i];
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FillChar(Context, sizeof(Context), 0)
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end;
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end.