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73 lines
2.8 KiB
PHTML
73 lines
2.8 KiB
PHTML
(*************************************************************************
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Include file for AES_ENCR.PAS - AES_Encrypt for Pascal16/Full tables
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Version Date Author Modification
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------- -------- ------- ------------------------------------------
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0.10 09.07.06 W.Ehrhardt Initial version from AES_ENCR.PAS
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0.11 16.11.08 we Use Ptr2Inc from BTypes
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**************************************************************************)
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(**** (C) Copyright 2002-2006 Wolfgang Ehrhardt -- see copying_we.txt ****)
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{Normally used for TP5/5.5 (and during development BP7)}
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{---------------------------------------------------------------------------}
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procedure AES_Encrypt(var ctx: TAESContext; {$ifdef CONST} const {$else} var {$endif} BI: TAESBlock; var BO: TAESBlock);
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{-encrypt one block, not checked: key must be encryption key}
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label done;
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var
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pK: PWA4; {pointer to loop rount key}
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r: integer;
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t,s: TAESBlock;
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begin
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{Setup key pointer}
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pK := PWA4(@ctx.RK);
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{Initialize with input block}
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TWA4(s)[0] := TWA4(BI)[0] xor pK^[0];
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TWA4(s)[1] := TWA4(BI)[1] xor pK^[1];
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TWA4(s)[2] := TWA4(BI)[2] xor pK^[2];
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TWA4(s)[3] := TWA4(BI)[3] xor pK^[3];
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inc(Ptr2Inc(pK), 4*sizeof(longint));
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r := 1;
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while true do begin
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TWA4(t)[0] := Te0[s[0*4+0]] xor Te1[s[1*4+1]] xor Te2[s[2*4+2]] xor Te3[s[3*4+3]] xor pK^[0];
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TWA4(t)[1] := Te0[s[1*4+0]] xor Te1[s[2*4+1]] xor Te2[s[3*4+2]] xor Te3[s[0*4+3]] xor pK^[1];
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TWA4(t)[2] := Te0[s[2*4+0]] xor Te1[s[3*4+1]] xor Te2[s[0*4+2]] xor Te3[s[1*4+3]] xor pK^[2];
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TWA4(t)[3] := Te0[s[3*4+0]] xor Te1[s[0*4+1]] xor Te2[s[1*4+2]] xor Te3[s[2*4+3]] xor pK^[3];
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inc(Ptr2Inc(pK), 4*sizeof(longint));
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inc(r);
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if r>=ctx.rounds then goto done;
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TWA4(s)[0] := Te0[t[0*4+0]] xor Te1[t[1*4+1]] xor Te2[t[2*4+2]] xor Te3[t[3*4+3]] xor pK^[0];
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TWA4(s)[1] := Te0[t[1*4+0]] xor Te1[t[2*4+1]] xor Te2[t[3*4+2]] xor Te3[t[0*4+3]] xor pK^[1];
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TWA4(s)[2] := Te0[t[2*4+0]] xor Te1[t[3*4+1]] xor Te2[t[0*4+2]] xor Te3[t[1*4+3]] xor pK^[2];
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TWA4(s)[3] := Te0[t[3*4+0]] xor Te1[t[0*4+1]] xor Te2[t[1*4+2]] xor Te3[t[2*4+3]] xor pK^[3];
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inc(Ptr2Inc(pK), 4*sizeof(longint));
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inc(r);
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end;
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done:
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s[00] := SBox[t[0*4+0]];
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s[01] := SBox[t[1*4+1]];
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s[02] := SBox[t[2*4+2]];
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s[03] := SBox[t[3*4+3]];
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s[04] := SBox[t[1*4+0]];
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s[05] := SBox[t[2*4+1]];
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s[06] := SBox[t[3*4+2]];
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s[07] := SBox[t[0*4+3]];
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s[08] := SBox[t[2*4+0]];
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s[09] := SBox[t[3*4+1]];
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s[10] := SBox[t[0*4+2]];
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s[11] := SBox[t[1*4+3]];
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s[12] := SBox[t[3*4+0]];
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s[13] := SBox[t[0*4+1]];
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s[14] := SBox[t[1*4+2]];
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s[15] := SBox[t[2*4+3]];
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TWA4(BO)[0] := TWA4(s)[0] xor pK^[0];
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TWA4(BO)[1] := TWA4(s)[1] xor pK^[1];
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TWA4(BO)[2] := TWA4(s)[2] xor pK^[2];
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TWA4(BO)[3] := TWA4(s)[3] xor pK^[3];
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end;
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