/**
* Initializes this cipher with a key and a source of randomness. The cipher is initialized for
* one of the following four operations: encryption, decryption, key wrapping or key unwrapping,
* depending on the value of <code>opmode</code>.
*
* <p>If this cipher (including its underlying feedback or padding scheme) requires any random
* bytes, it will get them from <code>random</code>.
*
* @param opmode the operation mode of this cipher (this is one of the following: <code>
* ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>), <code>WRAP_MODE</code> or <code>
* UNWRAP_MODE</code>)
* @param key the encryption key
* @param random the source of randomness
* @exception InvalidKeyException if the given key is inappropriate for initializing this cipher
*/
protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException {
try {
core.init(opmode, key, (AlgorithmParameterSpec) null, random);
} catch (InvalidAlgorithmParameterException ie) {
InvalidKeyException ike = new InvalidKeyException("requires PBE parameters");
ike.initCause(ie);
throw ike;
}
}
public Boolean verifySignature(byte[] originalData, byte[] signedData) {
boolean verified = false;
try {
Signature sig = Signature.getInstance("SHA1withDSA", "SUN");
sig.initVerify(getPublicKey());
sig.update(originalData, 0, originalData.length);
verified = sig.verify(signedData);
} catch (SignatureException ex) {
ex.printStackTrace();
Logger.getLogger(SignatureVerifier.class.getName()).log(Level.SEVERE, null);
} catch (InvalidKeyException ex) {
ex.printStackTrace();
Logger.getLogger(SignatureVerifier.class.getName()).log(Level.SEVERE, null);
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
Logger.getLogger(SignatureVerifier.class.getName()).log(Level.SEVERE, null);
} catch (NoSuchProviderException ex) {
ex.printStackTrace();
Logger.getLogger(SignatureVerifier.class.getName()).log(Level.SEVERE, null);
}
return verified;
}