Examples of java.security.KeyException

java.security.KeyException
This is the basic key exception. @see Key @see InvalidKeyException @see KeyManagementException @version 1.20 05/11/17 @author Benjamin Renaud


            try {
                factory = KeyFactory.getInstance("DSA");
                return factory.generatePublic(pubKeySpec);
            } catch (GeneralSecurityException e) {
                throw new KeyException("Unable to derive public key from DSA private key", e);
            }
        } else if (key instanceof RSAPrivateCrtKey) {
            RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;
            RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(rsaKey.getModulus(), rsaKey.getPublicExponent());


            try {
                factory = KeyFactory.getInstance("RSA");
                return factory.generatePublic(pubKeySpec);
            } catch (GeneralSecurityException e) {
                throw new KeyException("Unable to derive public key from RSA private key", e);
            }
        } else {
            throw new KeyException("Private key was not a DSA or RSA key");
        }
    }

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     * 
     * @throws KeyException thrown if the key can not be decoded
     */
    public static PrivateKey decodePrivateKey(File key, char[] password) throws KeyException {
        if (!key.exists()) {
            throw new KeyException("Key file " + key.getAbsolutePath() + " does not exist");
        }


        if (!key.canRead()) {
            throw new KeyException("Key file " + key.getAbsolutePath() + " is not readable");
        }


        try {
            return decodePrivateKey(DatatypeHelper.fileToByteArray(key), password);
        } catch (IOException e) {
            throw new KeyException("Error reading Key file " + key.getAbsolutePath(), e);
        }
    }

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    public static PrivateKey decodePrivateKey(byte[] key, char[] password) throws KeyException {
        try {
            PKCS8Key deocodedKey = new PKCS8Key(key, password);
            return deocodedKey.getPrivateKey();
        } catch (GeneralSecurityException e) {
            throw new KeyException("Unable to decode private key", e);
        }
    }

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     * @throws KeyException thrown if there is an error constructing key
     */
    public static RSAPrivateKey buildJavaRSAPrivateKey(String base64EncodedKey)  throws KeyException {
        PrivateKey key =  buildJavaPrivateKey(base64EncodedKey);
        if (! (key instanceof RSAPrivateKey)) {
            throw new KeyException("Generated key was not an RSAPrivateKey instance");
        }
        return (RSAPrivateKey) key;
    }

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     * @throws KeyException thrown if there is an error constructing key
     */
    public static DSAPrivateKey buildJavaDSAPrivateKey(String base64EncodedKey)  throws KeyException {
        PrivateKey key =  buildJavaPrivateKey(base64EncodedKey);
        if (! (key instanceof DSAPrivateKey)) {
            throw new KeyException("Generated key was not a DSAPrivateKey instance");
        }
        return (DSAPrivateKey) key;
    }

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    public static PublicKey buildKey(KeySpec keySpec, String keyAlgorithm) throws KeyException {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance(keyAlgorithm);
            return keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new KeyException(keyAlgorithm + "algorithm is not supported by the JCE", e);
        } catch (InvalidKeySpecException e) {
            throw new KeyException("Invalid key information", e);
        }
    }

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     * @throws KeyException thrown if the key algorithm is not supported by the JCE or the key spec does not
     *             contain valid information
     */
    public static PublicKey getDSAKey(DSAKeyValue keyDescriptor) throws KeyException {
        if (! hasCompleteDSAParams(keyDescriptor)) {
            throw new KeyException("DSAKeyValue element did not contain at least one of DSA parameters P, Q or G");
        }
        
        BigInteger gComponent = keyDescriptor.getG().getValueBigInt();
        BigInteger pComponent = keyDescriptor.getP().getValueBigInt();
        BigInteger qComponent = keyDescriptor.getQ().getValueBigInt();

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        try {
            KeyFactory keyFactory = KeyFactory.getInstance(keyAlgorithm);
            return keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            log.error(keyAlgorithm + " algorithm is not supported by this VM", e);
            throw new KeyException(keyAlgorithm + "algorithm is not supported by the JCE", e);
        } catch (InvalidKeySpecException e) {
            log.error("Invalid key information", e);
            throw new KeyException("Invalid key information", e);
        }
    }

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        } else if (algorithm.equals("RSA")) {
            return new DOMKeyValue.RSA(key);
        } else if (algorithm.equals("EC")) {
            return new DOMKeyValue.EC(key);
        } else {
            throw new KeyException("unsupported key algorithm: " + algorithm);
        }
    }

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        }
    }


    public PublicKey getPublicKey() throws KeyException {
        if (publicKey == null) {
            throw new KeyException("can't convert KeyValue to PublicKey");
        } else {
            return publicKey;
        }
    }

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