/**
* Zero argument constructor for generation a key pair There will be a public key and a private
* key available
*
* @throws KOAException This exception will be thrown when there is a problem with generation a
* key pair
*/
public KOAKeyPair() throws KOAException {
try {
KEYPAIR_KEY_LENGTH = TechnicalProps.getIntProperty(TechnicalProps.RSA_KEY_LENGTH);
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEYPAIR_GENERATOR_ALGORITHM);
keyPairGen.initialize(KEYPAIR_KEY_LENGTH);
keyPair = keyPairGen.generateKeyPair();
} catch (NoSuchAlgorithmException nsae) {
// KOALogHelper.logError ("KOAKeyPair", "Cannot generate key pair", nsae);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_GENERATE, nsae);
}
}
/**
* Constructor for decryption of a key. Only the public of private key of the <code>keyType</code>
* will be available the other will return null
*
* @param password The password used for decryption
* @param criptKey A stream with the encrypted key
* @param keyType The type of the key public (<code>PUBLIC_KEY</code>) or private (<code>
* PRIVATE_KEY</code>)
* @throws KOAException This exception will be thrown when there is a problem with decryption
*/
public KOAKeyPair(String password, InputStream cryptKey, int keyType) throws KOAException {
try {
KEYPAIR_KEY_LENGTH = TechnicalProps.getIntProperty(TechnicalProps.RSA_KEY_LENGTH);
PBEParameterSpec paramSpec = new PBEParameterSpec(SALT, 20);
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory kf = SecretKeyFactory.getInstance(KEY_ENCRIPTION_AKGORITHM);
SecretKey passwordKey = kf.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance(KEY_ENCRIPTION_AKGORITHM);
cipher.init(Cipher.UNWRAP_MODE, passwordKey, paramSpec);
byte[] dummy = new byte[128];
int length;
ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
while ((length = cryptKey.read(dummy)) != -1) {
byteArray.write(dummy, 0, length);
}
if (keyType == PRIVATE_KEY) {
Key unwrappedKey =
cipher.unwrap(byteArray.toByteArray(), KEYPAIR_GENERATOR_ALGORITHM, keyType);
keyPair = new KeyPair(null, (PrivateKey) unwrappedKey);
} else if (keyType == PUBLIC_KEY) {
Key unwrappedKey =
cipher.unwrap(byteArray.toByteArray(), KEYPAIR_GENERATOR_ALGORITHM, keyType);
keyPair = new KeyPair((PublicKey) unwrappedKey, null);
} else {
throw new InvalidKeyException("criptKey does not represent a wrapped key of type keyType");
}
} catch (NoSuchAlgorithmException nsae) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", nsae);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, nsae);
} catch (NoSuchPaddingException nspe) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", nspe);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, nspe);
} catch (InvalidKeySpecException ikse) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", ikse);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, ikse);
} catch (InvalidKeyException ike) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", ike);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, ike);
} catch (InvalidAlgorithmParameterException iape) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", iape);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, iape);
} catch (IOException ioe) {
KOALogHelper.logError("KOAKeyPair", "Cannot decrypt key pair", ioe);
throw new KOAException(ErrorConstants.SECURITY_KEYPAIR_DECRYPT, ioe);
}
}