(Java) Load an SSH Key from a File (Many Formats Supported)

Demonstrates how to load an SSH public or private key object from a file. The file can be in any of the following formats:

• OpenSSH private key
• OpenSSH public key
• PuTTY private key
• RFC 4716 public key

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris 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[])
  {
    CkSshKey sshkey = new CkSshKey();

    // First, use the LoadText convenience method to load a text file (of any SSH key format)
    // into a string:
    String strKey = sshkey.loadText("../mySshKeys/myKey.txt");

    // Next, load the key into the SSH key object.

    // If the key is an OpenSSH private key:
    // (In actuality, the From* methods will automatically detect the format and load
    // the key correctly.  For example, if a PuTTY private key is passed to FromOpenSshPrivateKey,
    // it  will still load correctly.)
    boolean success = sshkey.FromOpenSshPrivateKey(strKey);
    if (success != true) {
        System.out.println(sshkey.lastErrorText());
        }
    else {
        System.out.println("Loaded OpenSSH private key.");
        return;
        }

    // If the key is an OpenSSH public key:
    success = sshkey.FromOpenSshPublicKey(strKey);
    if (success != true) {
        System.out.println(sshkey.lastErrorText());
        }
    else {
        System.out.println("Loaded OpenSSH public key.");
        return;
        }

    // If the key is a PuTTY private key:
    success = sshkey.FromPuttyPrivateKey(strKey);
    if (success != true) {
        System.out.println(sshkey.lastErrorText());
        }
    else {
        System.out.println("Loaded PuTTY private key.");
        return;
        }

    // If the key is an RFC 4716 public key:
    success = sshkey.FromRfc4716PublicKey(strKey);
    if (success != true) {
        System.out.println(sshkey.lastErrorText());
        }
    else {
        System.out.println("Loaded RFC 4716 public key.");
        }
  }
}