Example usage for javax.crypto KeyGenerator generateKey

Introduction

In this page you can find the example usage for javax.crypto KeyGenerator generateKey.

Prototype

public final SecretKey generateKey() 

Source Link

Document

Generates a secret key.

Usage

From source file:eap.util.EDcodeUtil.java

private static byte[] genHmacKey(String algorithm) {
    try {//  www  .ja  va 2 s  . c om
        KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm, provider);
        SecretKey secretKey = keyGenerator.generateKey();

        return secretKey.getEncoded();
    } catch (NoSuchAlgorithmException e) {
        throw new IllegalArgumentException("No such algorithm [" + algorithm + "]");
    }
}

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From source file:net.jmhertlein.core.crypto.Keys.java

/**
 * Generates a new AES key using the system's default SecureRandom
 *
 * @param bits/*w  ww. j a  va 2s. c o  m*/
 *
 * @return the AES key, or null if the AES algorithm is not available on the system
 */
public static SecretKey newAESKey(int bits) {
    KeyGenerator keyGen;

    try {
        keyGen = KeyGenerator.getInstance("AES");
    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(Keys.class.getName()).log(Level.SEVERE, null, ex);
        return null;
    }

    keyGen.init(bits);

    return keyGen.generateKey();
}

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From source file:org.opensaml.xml.security.XMLSecurityHelper.java

/**
 * Generates a random Java JCE symmetric Key object from the specified XML Encryption algorithm URI.
 * /* w w  w .  ja  v  a  2s.co m*/
 * @param algoURI The XML Encryption algorithm URI
 * @return a randomly-generated symmetric Key
 * @throws NoSuchAlgorithmException thrown if the specified algorithm is invalid
 * @throws KeyException thrown if the length of the key to generate could not be determined
 */
public static SecretKey generateSymmetricKey(String algoURI) throws NoSuchAlgorithmException, KeyException {
    Logger log = getLogger();
    String jceAlgorithmName = getKeyAlgorithmFromURI(algoURI);
    if (StringSupport.isNullOrEmpty(jceAlgorithmName)) {
        log.error("Mapping from algorithm URI '" + algoURI
                + "' to key algorithm not available, key generation failed");
        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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From source file:org.openmrs.util.Security.java

/**
 * generate a new secret key; should only be called once in order to not invalidate all
 * encrypted data//  ww w .j av a2  s  .  c  o m
 *
 * @return generated secret key byte array
 * @since 1.9
 */
public static byte[] generateNewSecretKey() {
    // Get the KeyGenerator
    KeyGenerator kgen = null;
    try {
        kgen = KeyGenerator.getInstance(OpenmrsConstants.ENCRYPTION_KEY_SPEC);
    } catch (NoSuchAlgorithmException e) {
        throw new APIException("could.not.generate.cipher.key", null, e);
    }
    kgen.init(128); // 192 and 256 bits may not be available

    // Generate the secret key specs.
    SecretKey skey = kgen.generateKey();

    return skey.getEncoded();
}

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From source file:org.openTwoFactor.clientExt.edu.internet2.middleware.morphString.Crypto.java

/**
 * Generate a key./* ww  w  . j a v a 2  s.c  om*/
 * @param cipherName the name of the cipher, if null will default to "AES"
 * @param keybits the number of bits in the key, if null will default to 128
 * @return the bytes comprising the key
 */
public static byte[] generateKeyBytes(String cipherName, Integer keybits) {
    KeyGenerator keyGenerator = null;
    cipherName = cipherName == null ? "AES" : cipherName;
    try {
        keyGenerator = KeyGenerator.getInstance(cipherName);
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("Failed to create KeyGenerator for cipherName=" + cipherName, e);
    }
    keyGenerator.init(keybits == null ? 128 : keybits); // 192 and 256 bits may not be available

    // Generate the secret key specs.
    SecretKey secretKey = keyGenerator.generateKey();
    byte[] keyBytes = secretKey.getEncoded();

    return keyBytes;
}

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From source file:com.owncloud.android.utils.EncryptionUtils.java

public static byte[] generateKey() {
    KeyGenerator keyGenerator;
    try {//from www  .  j  a  v  a  2  s.  com
        keyGenerator = KeyGenerator.getInstance(AES);
        keyGenerator.init(128);

        return keyGenerator.generateKey().getEncoded();
    } catch (NoSuchAlgorithmException e) {
        Log_OC.e(TAG, e.getMessage());
    }

    return null;
}

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From source file:org.opensaml.xml.security.SecurityHelper.java

/**
 * Generates a random Java JCE symmetric Key object from the specified XML Encryption algorithm URI.
 * //w  ww  . ja  v  a  2  s.c om
 * @param algoURI The XML Encryption algorithm URI
 * @return a randomly-generated symmetric Key
 * @throws NoSuchAlgorithmException thrown if the specified algorithm is invalid
 * @throws KeyException thrown if the length of the key to generate could not be determined
 */
public static SecretKey generateSymmetricKey(String algoURI) throws NoSuchAlgorithmException, KeyException {
    String jceAlgorithmName = getKeyAlgorithmFromURI(algoURI);
    if (DatatypeHelper.isEmpty(jceAlgorithmName)) {
        log.error("Mapping from algorithm URI '" + algoURI
                + "' to key algorithm not available, key generation failed");
        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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From source file:eap.util.EDcodeUtil.java

private static byte[] aes(byte[] data, byte[] key, int keyLen, int opMode) {
    try {//from  w  w  w  . ja v  a2 s .c  o  m
        KeyGenerator kgen = KeyGenerator.getInstance("AES", provider);
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); // provider
        secureRandom.setSeed(key);
        kgen.init(keyLen, secureRandom);
        SecretKey secretKey = kgen.generateKey();
        SecretKeySpec keySpec = new SecretKeySpec(secretKey.getEncoded(), "AES");

        /* mode:   ECB/CBC/PCBC/CTR/CTS/CFB/CFB8 to CFB128/OFB/OBF8 to OFB128<br/> 
        * padding: Nopadding/PKCS5Padding/ISO10126Padding
        */
        Cipher cipher = Cipher.getInstance("AES", provider); // ECB/PKCS5Padding
        cipher.init(opMode, keySpec);

        return cipher.doFinal(data);
    } catch (Exception e) {
        throw new IllegalArgumentException(e.getMessage(), e);
    }

    //      // we're using Bouncy Castle
    //       Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider())
    //
    //       // create our key specification
    //       val secretKeySpec = new SecretKeySpec(hexStringToByteArray(hexEncodedKey), "AES")
    //        
    //       // create an AES engine in CTR mode (no padding)
    //       val aes = Cipher.getInstance("AES/CTR/NoPadding", BouncyCastleProvider.PROVIDER_NAME)
    //        
    //       // initialize the AES engine in encrypt mode with the key and IV
    //       aes.init(Cipher.ENCRYPT_MODE, secretKeySpec, new IvParameterSpec(hexStringToByteArray(hexEncodedIv)))
    //        
    //       // encrypt the message and return the encrypted byte array
    //       aes.doFinal(hexStringToByteArray(hexEncodedMessage))
}

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From source file:org.apache.myfaces.shared_ext202patch.util.StateUtils.java

private static byte[] findSecret(String secret, String algorithm) {
    byte[] bytes = null;

    if (secret == null) {
        try {/* w ww  . j  a  v a 2  s .c  om*/
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            bytes = kg.generateKey().getEncoded();

            if (log.isLoggable(Level.FINE))
                log.fine("generated random password of length " + bytes.length);
        } catch (NoSuchAlgorithmException e) {
            // Generate random password length 8, 
            int length = 8;
            bytes = new byte[length];
            new Random().nextBytes(bytes);

            if (log.isLoggable(Level.FINE))
                log.fine("generated random password of length " + length);
        }
    } else {
        bytes = new Base64().decode(secret.getBytes());
    }

    return bytes;
}

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From source file:org.apache.myfaces.shared_ext202patch.util.StateUtils.java

private static byte[] findMacSecret(String secret, String algorithm) {
    byte[] bytes = null;

    if (secret == null) {
        try {/*from w  ww.  j  a va2s .  co m*/
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            bytes = kg.generateKey().getEncoded();

            if (log.isLoggable(Level.FINE))
                log.fine("generated random mac password of length " + bytes.length);
        } catch (NoSuchAlgorithmException e) {
            // Generate random password length 8, 
            int length = 8;
            bytes = new byte[length];
            new Random().nextBytes(bytes);

            if (log.isLoggable(Level.FINE))
                log.fine("generated random mac password of length " + length);
        }
    } else {
        bytes = new Base64().decode(secret.getBytes());
    }

    return bytes;
}

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