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(Java) RSA Encrypt and Decrypt Strings

Java sample code to RSA public-key encrypt and decrypt strings using public and private keys.

Chilkat Java Downloads

Java Libs for Windows, Linux, MAC OS X, Solaris,
FreeBSD, ARM Embedded Linux, and PowerLinux

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[])
  {
    CkRsa rsa = new CkRsa();

    boolean success = rsa.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println("RSA component unlock failed");
        return;
    }

    //  This example also generates the public and private
    //  keys to be used in the RSA encryption.
    //  Normally, you would generate a key pair once,
    //  and distribute the public key to your partner.
    //  Anything encrypted with the public key can be
    //  decrypted with the private key.  The reverse is
    //  also true: anything encrypted using the private
    //  key can be decrypted using the public key.

    //  Generate a 1024-bit key.  Chilkat RSA supports
    //  key sizes ranging from 512 bits to 4096 bits.
    success = rsa.GenerateKey(1024);
    if (success != true) {
        System.out.println(rsa.lastErrorText());
        return;
    }

    //  Keys are exported in XML format:
    String publicKey = rsa.exportPublicKey();
    String privateKey = rsa.exportPrivateKey();

    String plainText = "Encrypting and decrypting should be easy!";

    //  Start with a new RSA object to demonstrate that all we
    //  need are the keys previously exported:
    CkRsa rsaEncryptor = new CkRsa();

    //  Encrypted output is always binary.  In this case, we want
    //  to encode the encrypted bytes in a printable string.
    //  Our choices are "hex", "base64", "url", "quoted-printable".
    rsaEncryptor.put_EncodingMode("hex");

    //  We'll encrypt with the public key and decrypt with the private
    //  key.  It's also possible to do the reverse.
    success = rsaEncryptor.ImportPublicKey(publicKey);

    boolean usePrivateKey = false;
    String encryptedStr = rsaEncryptor.encryptStringENC(plainText,usePrivateKey);
    System.out.println(encryptedStr);

    //  Now decrypt:
    CkRsa rsaDecryptor = new CkRsa();

    rsaDecryptor.put_EncodingMode("hex");
    success = rsaDecryptor.ImportPrivateKey(privateKey);

    usePrivateKey = true;
    String decryptedStr = rsaDecryptor.decryptStringENC(encryptedStr,usePrivateKey);

    System.out.println(decryptedStr);

  }
}

 

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