[fpc-pascal] Saving and reading TBlowfish crypted text

[Ewald]

On 17 Mar 2015, at 10:50, Graeme Geldenhuys wrote:

> On 2015-03-16 20:05, Antonio Sanguigni wrote:
>>   en.WriteAnsiString(Memo1.Lines.Text);
>>   fs.WriteBuffer(Pointer(s1.DataString)^, length(s1.DataString));
>>   en.Free;
> 
> Maybe you decryption isn't working because the encrypted text you
> created isn't complete.
> 
> Normally you need to call Flush to write the remaining bytes before you
> free the TBlowFishEncryptStream instance.

The docs state that it is called automatically upon destruction:
"Flush is called automatically when the stream is destroyed, so there is no need to call it after all data was written and the stream is no longer needed."
    -- http://www.freepascal.org/docs-html/fcl/blowfish/tblowfishencryptstream.flush.html


A question related to this thread: what mode-of-operation do the TBlowFishStream descendants use? e.g. EBC, CBC, STR, OFB, ...  (abbreviations taken from http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation)

It is not documented at http://www.freepascal.org/docs-html/fcl/blowfish/tblowfishencryptstream.html I think.

--
Ewald