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. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // 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..
    CkBinData bdModulus = new CkBinData();
    bdModulus.AppendEncoded(modulus,"hex");
    CkBinData bdExponent = new CkBinData();
    bdExponent.AppendEncoded(exponent,"hex");

    CkXml xml = new CkXml();
    xml.put_Tag("RsaKeyValue");
    xml.NewChild2("Modulus",bdModulus.getEncoded("base64"));
    xml.NewChild2("Exponent",bdExponent.getEncoded("base64"));

    // Now load into the pubkey object..
    CkPublicKey pubkey = new CkPublicKey();
    success = pubkey.LoadFromString(xml.getXml());
    if (success == false) {
        System.out.println(pubkey.lastErrorText());
        return;
        }

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