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inside custom component

Java Development

Posts: 31
Registered: ‎08-05-2011
My Device: 9550
My Carrier: Vodafone

Getting PEM key to form an instance of RSA Public key



I had posted this in other thread, but felt dat this should be started in a new thread.


My Question is how to get that PEM key from the webservice

I get the public key from the webservice its like this


// the key goes here

-----END PUBLIC KEY-----


I remove the other tags to get the Public key form the rest of the string so as to retrive the public key.



    public static RSAPublicKey readPublicKey(String strPEMKey) {

        RSAPublicKey publicKey = null;
        X509Certificate clientCert = null;

        byte[] certBuf = null;

        try {

            certBuf = Base64InputStream.decode(strPEMKey);

        } catch (Exception ex) {

        try {

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


//But i get the public key as NULL always


        } catch (CertificateParsingException ex) {
        } catch (InvalidCryptoSystemException ex) {
        return publicKey;




My signature verification function is as follows


    public static boolean verify(RSAPublicKey publicKey, byte[] data,
            byte[] signature) throws CryptoException {
        PKCS1SignatureVerifier verifier = new PKCS1SignatureVerifier(publicKey,
                signature, 0);
        return verifier.verify();


This method is from the AdvancedCryptoDeveloperLab.java class that i found on the Developers forum and it is dhared by many users in other thread also.


I want to verify the RSA signature that is sent by other webservice using the verify() function above. I have the the "RSA Signature" stored in a string and the "Plaintext" in other string that i converted to bytes to Verify the signature. But the Public Key is always giving me as NULL.

Can any one help me here...Please.

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Posts: 12
Registered: ‎01-22-2013
My Device: 9900
My Carrier: GiffGaff

Re: Getting PEM key to form an instance of RSA Public key

hi there, did you manage to find a solution for this? if yes. please could you share your experience