Java

RSA Decrypt using PEM

See more RSA Examples

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file. 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;

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

    CkRsa rsa = new CkRsa();

    CkPrivateKey key = new CkPrivateKey();

    // Load an RSA private key from an unencrypted PEM file:
    // (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

    success = key.LoadPemFile("qa_data/rsa/decryptTest/priv.pem");
    if (success == false) {
        System.out.println(key.lastErrorText());
        return;
        }

    // Make the key available to the RSA object
    success = rsa.UsePrivateKey(key);
    if (success == false) {
        System.out.println(rsa.lastErrorText());
        return;
        }

    String encryptedStr = "pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA==";

    rsa.put_EncodingMode("base64");

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

    System.out.println("Decrypted:");
    System.out.println(decryptedStr);
  }
}