How to hash using DCPcrypt? - delphi

Question

I have scowered the net trying to find an example of a function, how to hash text with Sha1 and DCPcrypt.
I have the below example. Seems to pop up the whole time.
But it returns chinese characters every time. Please assist in corecting the function.
function TForm1.EncryptThis(aString : string) : string;
var
Cipher: TDCP_cast256;
KeyStr: string;
begin
KeyStr:= '';
Cipher:= TDCP_cast256.Create(Self);
Cipher.InitStr(KeyStr,TDCP_sha1);
result := Cipher.EncryptString(aString);
Cipher.Burn;
Cipher.Free;
end;
UPDATE:
Using the links and info belowe, I built these functions. But as I said, This does not make alot of sense to me. So please excuse the ignorance.
THe code however does not work. Its output is: 3F3F3F3F3F3F3F3F3F3F00000000000000000000 whereas it should be 40bd001563085fc35165329ea1ff5c5ecbdbbeef since i told the program to has 123.
Please help.
function CalcDigest(text: string): string;
var
x: TDCP_hash;
begin
x := TDCP_sha1.Create(nil);
try
x.Init;
x.UpdateStr(text);
SetLength(Result, x.GetHashSize div 8);
x.Final(Result[1]);
finally
x.Free;
end;
end;
function String2Hex(const Buffer: Ansistring): string;
begin
SetLength(result, 2*Length(Buffer));
BinToHex(#Buffer[1], PWideChar(#result[1]), Length(Buffer));
end;
procedure TForm1.Button1Click(Sender: TObject);
var
I: Integer;
begin
memo2.Lines.Add(String2Hex(CalcDigest(memo1.Lines.Strings[0])));
end;

Answer 1

Judging by this, you can do it this way:
function CalcDigest(text: string): string;
var
x: TDCP_hash;
begin
x := TDCP_sha1.Create(nil);
try
x.Init;
x.UpdateStr(text);
SetLength(Result, x.GetHashSize div 8);
x.Final(Result[1]);
finally
x.Free;
end;
end;
You may want to encode the hash before printing, because the output is binary. See for example this question.

Answer 2

I am not very familiar with DCPCrypt. You can also use other libraries.
1) Indy - usually included in Delphi
function SHA1Text(const s: string): string;
begin
with TIdHashSHA1.Create do
try
Result:=LowerCase(HashStringAsHex(s));
finally
Free;
end;
end;
2) Wolfgang Ehrhardt's libraries (fastest as far as I know) from
http://www.wolfgang-ehrhardt.de/crchash_en.html
function SHA1Text(const s: string): string;
var
Context: THashContext;
SHA1Digest: TSHA1Digest;
begin
SHA1Init(Context);
SHA1Update(Context, pChar(s), length(s));
SHA1Final(Context, SHA1Digest);
Result:=HexStr(#SHA1Digest, SizeOf(SHA1Digest));
end;
NOTE: it is from Delphi 7. You will need to update it if you use unicode Delphi.