author | unc0rr |
Sat, 26 Jun 2010 16:57:43 +0400 | |
changeset 3564 | 7c583c88327b |
parent 3407 | dcc129c4352e |
permissions | -rw-r--r-- |
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(* |
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* Hedgewars, a free turn based strategy game |
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* Copyright (c) 2004-2010 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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{$INCLUDE "options.inc"} |
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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 := $CA62C1D6 |
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end; |
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end; |
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procedure SHA1Hash(var Context: TSHA1Context); |
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var S: array[0..4 ] of LongWord; |
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W: array[0..79] of LongWord; |
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i, t: LongWord; |
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begin |
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{$HINTS OFF} |
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move(Context.H, S, sizeof(S)); |
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{$HINTS ON} |
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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 |
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SHA1Final[i]:= Context.H[i]; |
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FillChar(Context, sizeof(Context), 0) |
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end; |
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end. |