How to change THash.Hash at runtime

Question

How can I change the default THash.Hash algorythm from trhe default SHA-1 to MD5?

The following does not works:

var
  StringHash: THash;
begin
  StringHash.Create(nil);
  StringHash.Hash := 'MD5';
end;

---

Edit:

Yes you are all right: I apologize for not having mentioned the fact that THash is a class of the new TurboPower LockBox 3.

My apologies again for this omission!

Anyway Sean has already given the answer I was looking for.

Thank you all

Answer 1

Assuming that you are referring to the THash component of TurboPower Lockbox, you can select the hashing algorithm at run-time like so:

function FindHashOfBananaBananaBanana: TBytes;
var
  StringHash: THash;
  Lib: TCrypographicLibrary;
begin
StringHash := THash.Create( nil);
Lib := TCrypographicLibrary( nil);
try
  StringHash.CryptoLibrary := Lib;
  StringHash.HashId := SHA512_ProgId; // Find constants for other algorithms
                                      //  in unit uTPLb_Constants.
  StringHash.HashAnsiString('Banana banana banana');
  SetLength( result, StringHash.HashOutputValue.Size);
  StringHash.HashOutputValue.Read( result[0], StringHash.HashOutputValue.Size);
  StringHash.Burn
finally
  StringHash.Free;
  Lib.Free
  end
end;