Java

Load RSA Public Key from Hex Modulus and Exponent

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Load an RSA public key from a hex modulus and exponent. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.PublicKey;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        // Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
        String modulus = "BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429";

        String exponent = "00000003";

        // We'll need to re-encode from hex to base64..
        BinData bdModulus = new BinData();
        bdModulus.appendEncoded(modulus, "hex");
        BinData bdExponent = new BinData();
        bdExponent.appendEncoded(exponent, "hex");

        Xml xml = new Xml();
        xml.setTag("RsaKeyValue");
        xml.newChild2("Modulus", bdModulus.getEncoded("base64"));
        xml.newChild2("Exponent", bdExponent.getEncoded("base64"));

        // Now load into the pubkey object..
        PublicKey pubkey = new PublicKey();
        try {
            pubkey.loadFromString(xml.getXml());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Success.");
    }
}