Java Development

[ashishjmeshram]

Hi

I can read RSA publick key from PEM file but how can I read Private key also?

Here is my code to read Publick Key.

public static byte[] readFile(String fileName) {
	byte[] data = null;
	try {
		Class classs = Class
				.forName("CryptographyUtil");
		InputStream is = classs.getResourceAsStream(fileName);
		int len = is.available();
		data = new byte[len];
		is.read(data);
	} catch (Exception ex) {
		ex.printStackTrace();
	}
	return data;
}

public static RSAPublicKey readPublicKey() {
	String encodedMsg = new String(readFile("/PublicKey.pem"));
	RSAPublicKey publicKey = null;
	X509Certificate clientCert = null;
	
	byte[] certBuf = null;

	try {
		certBuf = Base64InputStream.decode(encodedMsg);
	} catch (Exception ex) {
		ex.printStackTrace();
	}
	try {
		clientCert = new X509Certificate(certBuf);
		publicKey = (RSAPublicKey) clientCert.getPublicKey();
	} catch (CertificateParsingException ex) {
		ex.printStackTrace();
	} catch (InvalidCryptoSystemException ex) {
		ex.printStackTrace();
	}
	return publicKey;
}

First I read the File using readFile method(). I get all file content in byte[]. Which then i use to get the publick key.

How do I get the private key?

Please help.

[ashishjmeshram]

Actually, if you see this line

clientCert = new X509Certificate(certBuf);
publicKey = (RSAPublicKey) clientCert.getPublicKey();

X509Certificate has method to get the publick key but not the private key.

Is there any way to get the private key also?

Thanks.