Delphi ActiveX

Duplicate Java HMAC-SHA1 using Chilkat

See more Encryption Examples

This example uses Chilkat to produce the same results as this Java code:

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

public void hmacSignatureExample() throws NoSuchAlgorithmException,
InvalidKeyException {

final String method = "POST";
final Long epoch = 1456765639015L; // Hardcoding for this example
final String uri = "/api/v5/policy/1234567890";
final String newline = "\n";

final String privateKey = "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra
/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw==";
final String publicKey = "16baedbe244b6c063968850716afb319a";

// Prepare the signature
final String plainText = method + newline + epoch + newline + uri + newline;

// Hash the plaintext with the private key
final byte[] keyBytes = privateKey.getBytes();
final Key key = new SecretKeySpec(keyBytes, 0, keyBytes.length, "HmacSHA1");
final Mac mac = Mac.getInstance("HmacSHA1");
mac.init(key);
String signatureHash = new String(Hex.encodeHex(mac.doFinal(plainText.
getBytes())));

// Prefix with public key
signatureHash = publicKey + ":" + signatureHash;

// Base64 encode to produce AUTHORIZATION
final String authorization = new String(Base64.encodeBase64(signatureHash.
getBytes()));
}

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
privateKey: WideString;
publicKey: WideString;
plainText: WideString;
crypt: TChilkatCrypt2;
hmacHex: WideString;
sbSignatureHash: TChilkatStringBuilder;
authorization: WideString;

begin
success := 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This is clearly in base64 encoding.
privateKey := 'qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw==';

// This is clearly in the hex encoding.
publicKey := '16baedbe244b6c063968850716afb319a';

plainText := 'POST' + #10 + '1456765639015' + #10 + '/api/v5/policy/1234567890' + #10;

crypt := TChilkatCrypt2.Create(Self);

// We want HMAC-SHA1.
crypt.MacAlgorithm := 'HMAC';
crypt.HashAlgorithm := 'SHA1';

// The Java code (above) is literally using the us-ascii chars of the base64 string as the HMAC key.
// (It is NOT using the base64 decoded bytes.)
crypt.SetMacKeyEncoded(privateKey,'us-ascii');

// We want our HMAC-SHA1 output to be a hex string.
crypt.EncodingMode := 'hex_lower';

hmacHex := crypt.MacStringENC(plainText);

Memo1.Lines.Add(hmacHex);

// The expected result is: dd3e8440f6b550f152156ea5e12d3e20b262adae

sbSignatureHash := TChilkatStringBuilder.Create(Self);
sbSignatureHash.Append(publicKey);
sbSignatureHash.Append(':');
sbSignatureHash.Append(hmacHex);

authorization := sbSignatureHash.GetEncoded('base64','utf-8');
Memo1.Lines.Add('Authorization: ' + authorization);

// The expected result is:  MTZiYWVkYmUyNDRiNmMwNjM5Njg4NTA3MTZhZmIzMTlhOmRkM2U4NDQwZjZiNTUwZjE1MjE1NmVhNWUxMmQzZTIwYjI2MmFkYWU=
end;