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

     * @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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     * @throws KeyException thrown if there is an error constructing key
     */
    public static ECPrivateKey buildJavaECPrivateKey(String base64EncodedKey)  throws KeyException {
        PrivateKey key =  buildJavaPrivateKey(base64EncodedKey);
        if (! (key instanceof ECPrivateKey)) {
            throw new KeyException("Generated key was not an ECPrivateKey instance");
        }
        return (ECPrivateKey) 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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     */
    public static PublicKey getKey(DEREncodedKeyValue keyValue) throws KeyException{
        String[] supportedKeyTypes = { "RSA", "DSA", "EC"};
        
        if (keyValue.getValue() == null) {
            throw new KeyException("No data found in key value element");
        }
        byte[] encodedKey = Base64.decode(keyValue.getValue());


        // Iterate over the supported key types until one produces a public key.
        for (String keyType : supportedKeyTypes) {
            try {
                KeyFactory keyFactory = KeyFactory.getInstance(keyType);
                X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey);
                PublicKey publicKey = keyFactory.generatePublic(keySpec);
                if (publicKey != null) {
                    return publicKey;
                }
            } catch (NoSuchAlgorithmException e) {
                // ignore
            } catch (InvalidKeySpecException e) {
                // ignore
            }
        }
        throw new KeyException("DEREncodedKeyValue did not contain a supported key type");
    }

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          Constructor ctor = secretKeySpecClass.getDeclaredConstructor(signature);
          secretKey = ctor.newInstance(args);
      }
      catch(Exception e)
      {
          throw new KeyException("Failed to create SecretKeySpec from session key, msg="+e.getMessage());
      }
      catch(Throwable e)
      {
         throw new KeyException("Unexpected exception during SecretKeySpec creation, msg="+e.getMessage());
      }
      return secretKey;
   }

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            throw new NoSuchAlgorithmException("Algorithm URI'" + algoURI + "' is invalid for key generation");
        }
        Integer keyLength = getKeyLengthFromURI(algoURI);
        if (keyLength == null) {
            log.error("Key length could not be determined from algorithm URI, can't generate key");
            throw new KeyException("Key length not determinable from algorithm URI, could not generate new key");
        }
        KeyGenerator keyGenerator = KeyGenerator.getInstance(jceAlgorithmName);
        keyGenerator.init(keyLength);
        return keyGenerator.generateKey();
    }

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        try {
            return buildKey(keySpec, "EC");
        }
        catch (KeyException ex) {
        }
        throw new KeyException("Unsupported key type.");
    }

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