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(Java) Create PKCS1 RSA Signature with PEM Private Key

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

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

    CkPrivateKey pkey = new CkPrivateKey();

    // Load the private key from an RSA PEM file:
    boolean success = pkey.LoadPemFile("pvkey2_rsa.pem");

    String pkeyXml;
    // Get the private key in XML format:
    pkeyXml = pkey.getXml();

    CkRsa rsa = new CkRsa();

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKey(pkeyXml);
    if (success != true) {
        System.out.println(rsa.lastErrorText());
        return;
        }

    // This example will sign a string, and receive the signature
    // in a hex-encoded string.  Therefore, set the encoding mode
    // to "hex":
    rsa.put_EncodingMode("hex");

    // If some other non-Chilkat software is going to verify
    // the signature, it is important to match the byte-ordering.
    // The LittleEndian property may be set to true
    // for little-endian byte ordering, 
    // or false  for big-endian byte ordering.
    // Microsoft apps typically use little-endian, while
    // OpenSSL and other services (such as Amazon CloudFront)
    // use big-endian.
    rsa.put_LittleEndian(false);

    String strData = "This is the string to be signed.";

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "md5", "sha256",
    // "sha384", and "sha512".
    String hexSig = rsa.signStringENC(strData,"sha-1");

    System.out.println(hexSig);

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

 

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