{
* This Source Code Form is subject to the terms of the Mozilla Public License,
* v. 2.0. If a copy of the MPL was not distributed with this file, You can
* obtain one at http://mozilla.org/MPL/2.0/
*
* Copyright (C) 2010-2012, Peter Johnson (www.delphidabbler.com).
*
* $Rev$
* $Date$
*
* Static class that encrypts and decrypts binary data. Acts as a facade to the
* actual encryption engine.
*
* All code that requires encryption should use this class rather than making
* calls the the actual the encryption engine.
}
unit UEncryptor;
interface
uses
// Delphi
SysUtils,
// Project
UBaseObjects;
type
{
TEncryptor:
Static class that encrypts and decrypts binary data. Acts as a facade to the
actual encryption engine.
}
TEncryptor = class(TNoConstructObject)
strict private
const cEncryptKey = 46723; // Key used for encryption / decryption
class function BytesToRawString(const Bytes: TBytes): RawByteString;
{Copies the bytes from a byte array into a raw byte string.
@param Bytes [in] Bytes to be copied.
@return Raw byte string containing bytes.
}
class function RawStringToBytes(const Str: RawByteString): TBytes;
{Copies the bytes from a raw byte string into a byte array.
@param Str [in] Raw byte string to be copied.
@return Byte array containing bytes from string.
}
public
class function Encrypt(const Bytes: TBytes): TBytes;
{Encrypts data from a byte array.
@param Bytes [in] Array of bytes to be encrypted.
@return Byte array containing encrypted data.
}
class function Decrypt(const Bytes: TBytes): TBytes;
{Decrypts data from a byte array.
@param Bytes [in] Array of encrypted bytes to be decrypted.
@return Byte array containing decrypted data.
}
end;
implementation
uses
// 3rd party
UEncrypt;
{ TEncryptor }
class function TEncryptor.BytesToRawString(const Bytes: TBytes): RawByteString;
{Copies the bytes from a byte array into a raw byte string.
@param Bytes [in] Bytes to be copied.
@return Raw byte string containing bytes.
}
begin
SetLength(Result, Length(Bytes));
if Length(Bytes) > 0 then
Move(Bytes[0], Result[1], Length(Bytes));
end;
class function TEncryptor.Decrypt(const Bytes: TBytes): TBytes;
{Decrypts data from a byte array.
@param Bytes [in] Array of encrypted bytes to be decrypted.
@return Byte array containing decrypted data.
}
begin
Result := RawStringToBytes(
UEncrypt.Decrypt(
BytesToRawString(Bytes), cEncryptKey
)
);
end;
class function TEncryptor.Encrypt(const Bytes: TBytes): TBytes;
{Encrypts data from a byte array.
@param Bytes [in] Array of bytes to be encrypted.
@return Byte array containing encrypted data.
}
begin
Result := RawStringToBytes(
UEncrypt.Encrypt(
BytesToRawString(Bytes), cEncryptKey
)
);
end;
class function TEncryptor.RawStringToBytes(const Str: RawByteString): TBytes;
{Copies the bytes from a raw byte string into a byte array.
@param Str [in] Raw byte string to be copied.
@return Byte array containing bytes from string.
}
begin
SetLength(Result, Length(Str));
if Length(Str) > 0 then
Move(Str[1], Result[0], Length(Str));
end;
end.
