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delphiaes

I want to encrypt TidBytes with AES

I am using Tforge and Delphi and I am trying to encrypt TidBytes with AES

var Key,MyBytearray: ByteArray;
MyTidBytes:TidBytes;

Key:= ByteArray.FromText('1234567890123456');

EncryptedText:= TCipher.AES.ExpandKey(Key, CTR_ENCRYPT or PADDING_NONE).EncryptByteArray(MyBytearray);

This code works fine with ByteArray but I want to use it with idBytes is this possible?

How I will convert ByteArray to TidBytes?

Solution

  • ByteArray is declared as a record that internally holds an IBytes interfaced object wrapping the byte data. TIdBytes is declared as a simple dynamic array instead. As such, you can't directly typecast between them. You must copy the raw bytes back and forth.

    You can do that manually, eg:

    MyBytearray := ...;
MyTidBytes := RawToBytes(MyBytearray.Raw^, MyBytearray.Len);
// RawToBytes() is an Indy function in the IdGlobal unit...

...

MyTidBytes := ...;
MyBytearray := ByteArray.FromBytes(MyTidBytes);
// FromBytes() accepts any type of raw byte array as input, including dynamic arrays ...

    Or, alternatively, ByteArray has Implicit conversion operators for TBytes, and TIdBytes is typecast-compatible with TBytes as they are both dynamic arrays, eg:

    MyBytearray := ...;
TBytes(MyTidBytes) := MyBytearray;

...

MyTidBytes := ...;
MyBytearray := TBytes(MyTidBytes);