Java Development

[digitalhuman]

Since I was stuck with this for weeks I will help you all out with my working example code. Hope you enjoy it. I really don't want to put you in the same tunnel where I was. Cause you simply can't find anything about this on the internet. Well, not with using your own existing public and private keys.

Now, lets start.

Convert your Private PEM key to DER using openssl

1) openssl pkcs8 -topk8 -inform PEM -outform DER -in my.private.key -nocrypt > pkcs8_private_key.der

2) we will get the public key of your PEM .crt (Certificate file)

//Here what I did and use

openssl pkcs8 -topk8 -inform PEM -outform DER -in my.private.key -nocrypt > pkcs8_private_key.der

//First get the private key
RSAPrivateKey privKey = privKey = (RSAPrivateKey)PKCS8_PrivateKeyDecoder.decode(getClass().getResourceAsStream("pkcs8_private_key.der"), "PKCS8");

//Now get the public key from our PEM RSA certificate
InputStream stream = getClass().getResourceAsStream("sams.crt");
byte[] base64bytes = new byte[stream.available()];
stream.read(base64bytes, 0, base64bytes.length);
stream.close();

X509Certificate cert = (X509Certificate) CertificateUtilities.readCertificateFile("X509", base64bytes);
pubKey = (RSAPublicKey) cert.getPublicKey();

//Initiate the Crypto system
RSACryptoSystem crypt = crypt = new RSACryptoSystem(2048);  //I used 2048 bits keys


//Example method to encrypt data with the above objects

public String encrypt(String data){
	try{	
		if(data.length() > 0){
			NoCopyByteArrayOutputStream out = new NoCopyByteArrayOutputStream();
			data = data.trim();
			byte[] plain = data.getBytes();		
			RSAEncryptorEngine eng = new RSAEncryptorEngine(this.pubKey);
			PKCS1FormatterEngine fengine = new PKCS1FormatterEngine(eng);
			
			BlockEncryptor cryptoStream = new BlockEncryptor(fengine, out);
			cryptoStream.write( plain, 0, plain.length );
			cryptoStream.flush();
			cryptoStream.close();
			out.close();
			
			byte[] cipherText = out.getByteArray();
			
			String encMessage = Base64OutputStream.encodeAsString(cipherText, 0, cipherText.length, false, false);
			return encMessage;
		}else{
			return "";
		}
	}
	catch(Exception err){
		System.err.println(err.toString());
		return "";
	}
}

Also, i you need help with anything. Contact me on twitter: @digital_human or visit my blog: http://victorangelier.blogspot.com

[simon_hain]

that looks very helpful. maybe you could create a knowledge base article from it?

[digitalhuman]

Yes I can, where and howto do it?

[simon_hain]

http://supportforums.blackberry.com/t5/BlackBerry-World-Development/How-to-create-your-own-article-a...

[digitalhuman]

You are way to fast Thx

[digitalhuman]

Consider it done.