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(Java) RSA Sign with PKCS8 Encrypted KeyDemonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). Note: This example requires Chilkat v11.0.0 or greater.
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. CkPrivateKey privKey = new CkPrivateKey(); // Load the private key from an RSA PEM file: success = privKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789"); if (success == false) { System.out.println(privKey.lastErrorText()); return; } CkRsa rsa = new CkRsa(); // Import the private key into the RSA component: success = rsa.UsePrivateKey(privKey); if (success == false) { 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"); String strData = "This is the string to be signed."; // Sign the string using the sha256 hash algorithm. // Other valid choices are sha1, sha384, sha512 and others. String hexSig = rsa.signStringENC(strData,"sha256"); if (rsa.get_LastMethodSuccess() == false) { System.out.println(rsa.lastErrorText()); return; } System.out.println(hexSig); // Now verify with the public key. // This example shows how to use the public key from // a digital certificate (.cer file) CkCert cert = new CkCert(); success = cert.LoadFromFile("raul_publicKey.cer"); if (success == false) { System.out.println(cert.lastErrorText()); return; } CkPublicKey pubKey = new CkPublicKey(); cert.GetPublicKey(pubKey); CkRsa rsa2 = new CkRsa(); success = rsa2.UsePublicKey(pubKey); if (success == false) { System.out.println(rsa2.lastErrorText()); return; } // Verify the signature against the original data: rsa2.put_EncodingMode("hex"); success = rsa2.VerifyStringENC(strData,"sha256",hexSig); if (success == false) { System.out.println(rsa2.lastErrorText()); return; } System.out.println("Signature verified!"); // Verify with incorrect data: success = rsa2.VerifyStringENC("something else","sha256",hexSig); if (success != true) { System.out.println("Signature not verified! (which was expected in this case)"); } else { System.out.println("Hmmm... that's not right..."); } } } |
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