Java Requires Chilkat v11.0.0+

RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // This example will duplicate the following Java code:
        //
        // Signature sign = Signature.getInstance("SHA256withRSA");
        // sign.initSign(privateKey);
        // sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
        //
        // ...
        // byte[] resultado = sign.sign();
        // sello = encodeByteArrayToBase64(resultado);
        //

        // Load an RSA private key for signing.
        // You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
        PrivateKey privKey = new PrivateKey();
        try {
            privKey.loadAnyFormatFile("qa_data/pem/rsa_passwd.pem", "passwd");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Rsa rsa = new Rsa();
        rsa.usePrivateKey(privKey);

        String originalData = "This is the string to be hashed an RSA signed.";

        // Indicate that we want the iso-8859-1 byte representation of the string to be signed
        rsa.setCharset("iso-8859-1");

        // We want the RSA signature in base64 format
        rsa.setEncodingMode("base64");

        String sigBase64 = rsa.signStringENC(originalData, "sha256");
        System.out.println(sigBase64);
    }
}