mirror of
https://github.com/StephenGenusa/DCPCrypt.git
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5fc435d45f
DCPCrypt by David Barton updated and tested with Delphi 2009, 2010, XE, XE2, XE3, XE4, XE5 by Warren Postma. Updated for XE7 by Stephen Genusa.
192 lines
7.1 KiB
ObjectPascal
192 lines
7.1 KiB
ObjectPascal
{******************************************************************************}
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{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
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{******************************************************************************}
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{* A Base64 encoding/decoding unit ********************************************}
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{******************************************************************************}
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{* Copyright (c) 1999-2002 David Barton *}
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{* Permission is hereby granted, free of charge, to any person obtaining a *}
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{* copy of this software and associated documentation files (the "Software"), *}
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{* to deal in the Software without restriction, including without limitation *}
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{* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
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{* and/or sell copies of the Software, and to permit persons to whom the *}
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{* Software is furnished to do so, subject to the following conditions: *}
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{* *}
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{* The above copyright notice and this permission notice shall be included in *}
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{* all copies or substantial portions of the Software. *}
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{* *}
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{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
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{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
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{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
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{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
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{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
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{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
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{* DEALINGS IN THE SOFTWARE. *}
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{******************************************************************************}
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unit DCPbase64;
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interface
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uses
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{$ifdef NEXTGEN_FIXES}
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ORawByteString,
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{$endif}
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Sysutils;
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function Base64EncodeStr(const Value: AnsiString): AnsiString; overload;
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{ Encode a string into Base64 format }
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function Base64DecodeStr(const Value: AnsiString): AnsiString; overload;
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{ Decode a Base64 format string }
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{$IFDEF UNICODE}
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function Base64EncodeStr(const Value: UnicodeString): UnicodeString; overload;
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{ Encode a Unicode string into Base64 format }
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function Base64DecodeStr(const Value: UnicodeString): UnicodeString; overload;
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{ Decode a Base64 format Unicode string }
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{$ENDIF}
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function Base64Encode(pInput: pointer; pOutput: pointer; Size: longint): longint;
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{ Encode a lump of raw data (output is (4/3) times bigger than input) }
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function Base64Decode(pInput: pointer; pOutput: pointer; Size: longint): longint;
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{ Decode a lump of raw data }
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{******************************************************************************}
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{******************************************************************************}
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implementation
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{$Q-}{$R-}
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const
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B64: array[0..63] of byte= (65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
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81,82,83,84,85,86,87,88,89,90,97,98,99,100,101,102,103,104,105,106,107,108,
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109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,
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54,55,56,57,43,47);
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function Base64Encode(pInput: pointer; pOutput: pointer; Size: longint): longint;
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var
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i, iptr, optr: integer;
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Input, Output: PByteArray;
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begin
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Input:= PByteArray(pInput); Output:= PByteArray(pOutput);
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iptr:= 0; optr:= 0;
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for i:= 1 to (Size div 3) do
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begin
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Output^[optr+0]:= B64[Input^[iptr] shr 2];
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Output^[optr+1]:= B64[((Input^[iptr] and 3) shl 4) + (Input^[iptr+1] shr 4)];
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Output^[optr+2]:= B64[((Input^[iptr+1] and 15) shl 2) + (Input^[iptr+2] shr 6)];
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Output^[optr+3]:= B64[Input^[iptr+2] and 63];
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Inc(optr,4); Inc(iptr,3);
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end;
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case (Size mod 3) of
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1: begin
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Output^[optr+0]:= B64[Input^[iptr] shr 2];
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Output^[optr+1]:= B64[(Input^[iptr] and 3) shl 4];
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Output^[optr+2]:= byte('=');
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Output^[optr+3]:= byte('=');
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end;
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2: begin
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Output^[optr+0]:= B64[Input^[iptr] shr 2];
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Output^[optr+1]:= B64[((Input^[iptr] and 3) shl 4) + (Input^[iptr+1] shr 4)];
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Output^[optr+2]:= B64[(Input^[iptr+1] and 15) shl 2];
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Output^[optr+3]:= byte('=');
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end;
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end;
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Result:= ((Size+2) div 3) * 4;
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end;
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function Base64EncodeStr(const Value: AnsiString): AnsiString;
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begin
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{$IFDEF NEXTGEN}
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Result.SetLength( ((AnsiLength(Value)+2) div 3) * 4);
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Base64Encode(@Value.GetBuffer[0],@Result.GetBuffer[0],AnsiLength(Value));
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{$ELSE}
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SetLength(Result,((Length(Value)+2) div 3) * 4);
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Base64Encode(@Value[1],@Result[1],Length(Value));
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{$ENDIF}
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end;
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{$IFDEF UNICODE}
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function Base64EncodeStr(const Value: UnicodeString): UnicodeString;
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var
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temp: AnsiString;
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begin
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{$IFDEF NEXTGEN}
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temp.SetLength(((Length(Value)*SizeOf(Value[1])+2) div 3) * 4);
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Base64Encode(@Value[1],@temp.GetBuffer[0],Length(Value)*SizeOf(Value[1]));
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{$ELSE}
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SetLength(temp,(((Length(Value)*SizeOf(Value[1])+2) div 3) * 4));
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Base64Encode(@Value[1],@temp[1],Length(Value)*SizeOf(Value[1]));
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{$ENDIF}
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Result:= UnicodeString(temp);
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end;
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{$ENDIF}
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function Base64Decode(pInput: pointer; pOutput: pointer; Size: longint): longint;
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var
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i, j, iptr, optr: integer;
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Temp: array[0..3] of byte;
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Input, Output: PByteArray;
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begin
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Input:= PByteArray(pInput); Output:= PByteArray(pOutput);
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iptr:= 0; optr:= 0;
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Result:= 0;
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for i:= 1 to (Size div 4) do
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begin
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for j:= 0 to 3 do
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begin
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case Input^[iptr] of
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65..90 : Temp[j]:= Input^[iptr] - Ord('A');
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97..122: Temp[j]:= Input^[iptr] - Ord('a') + 26;
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48..57 : Temp[j]:= Input^[iptr] - Ord('0') + 52;
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43 : Temp[j]:= 62;
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47 : Temp[j]:= 63;
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61 : Temp[j]:= $FF;
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end;
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Inc(iptr);
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end;
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Output^[optr]:= (Temp[0] shl 2) or (Temp[1] shr 4);
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Result:= optr+1;
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if (Temp[2]<> $FF) and (Temp[3]= $FF) then
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begin
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Output^[optr+1]:= (Temp[1] shl 4) or (Temp[2] shr 2);
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Result:= optr+2;
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Inc(optr)
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end
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else if (Temp[2]<> $FF) then
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begin
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Output^[optr+1]:= (Temp[1] shl 4) or (Temp[2] shr 2);
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Output^[optr+2]:= (Temp[2] shl 6) or Temp[3];
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Result:= optr+3;
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Inc(optr,2);
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end;
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Inc(optr);
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end;
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end;
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function Base64DecodeStr(const Value: AnsiString): AnsiString;
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begin
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{$IFDEF NEXTGEN}
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Result.SetLength((AnsiLength(Value) div 4) * 3);
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Result.SetLength(Base64Decode(@Value.GetBuffer[0],@Result.GetBuffer[0],AnsiLength(Value)));
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{$ELSE}
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SetLength(Result,(Length(Value) div 4) * 3);
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SetLength(Result,Base64Decode(@Value[1],@Result[1],Length(Value)));
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{$ENDIF}
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end;
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{$IFDEF UNICODE}
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function Base64DecodeStr(const Value: UnicodeString): UnicodeString;
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var
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temp: AnsiString;
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begin
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temp:= AnsiString(Value);
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{$IFDEF NEXTGEN}
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SetLength(Result,(AnsiLength(temp) div 4) * 3);
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SetLength(Result,Base64Decode(@temp.GetBuffer[0],@Result[1],AnsiLength(temp)) div SizeOf(Result[1]));
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{$ELSE}
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SetLength(Result,(Length(temp) div 4) * 3);
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SetLength(Result,Base64Decode(@temp[1],@Result[1],Length(temp)) div SizeOf(Result[1]));
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{$ENDIF}
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end;
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{$ENDIF}
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end.
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