Java

RSA Sign using a Private Key on a USB Token or Smartcard

See more Apple Keychain Examples

Create an RSA signature using a private key stored on a USB token or smartcard.

Note: On MacOS and iOS, this example requires Chilkat v10.1.2 or later when the Apple Keychain is used as the underlying means to do the signing.

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
        // this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

        // Chilkat automatically detects and determines the way in which the HSM is used,
        // which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

        Cert cert = new Cert();

        // Set the token/smartcard PIN prior to loading.
        cert.setSmartCardPin("123456");

        // Specify the certificate by its common name.
        try {
            cert.loadFromSmartcard("cn=chilkat-rsa-2048");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Signing with cert: " + cert.getSubjectCN());

        // Create data to be hashed and signed.
        BinData bd = new BinData();
        for (int i = 0; i <= 100; i++) {
            bd.appendEncoded("000102030405060708090A0B0C0D0E0F", "hex");
        }

        Rsa rsa = new Rsa();

        // Use the certificate's private key for signing.
        try {
            rsa.setX509Cert(cert, true);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Sign the SHA-256 hash of the contents of bd.
        BinData bdSig = new BinData();
        try {
            rsa.signBd(bd, "sha256", bdSig);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The RSA signature is equal in length to the size of the RSA key.
        System.out.println("Output signature size in bits = " + (bdSig.getNumBytes() * 8));

        // We can save the signature for later verification..
        bdSig.writeFile("rsaSignatures/test1.sig");

        // See the example to verify the RSA signature:
        // Verfies an RSA Signature
    }
}