Example usage for java.security Key getAlgorithm

Introduction

In this page you can find the example usage for java.security Key getAlgorithm.

Prototype

public String getAlgorithm();

Source Link

Document

Returns the standard algorithm name for this key.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    // Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = "input".getBytes();
    byte[] ivBytes = "1234567812345678".getBytes();

    Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
    KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
    generator.init(128);//www .  ja  va  2  s .  co m
    Key encryptionKey = generator.generateKey();
    System.out.println("key : " + new String(encryptionKey.getEncoded()));

    cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
    ctLength += cipher.doFinal(cipherText, ctLength);
    Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
    ptLength += cipher.doFinal(plainText, ptLength);
    System.out.println("plain : " + new String(plainText));
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    byte[] input = "www.java2s.com".getBytes();

    byte[] ivBytes = new byte[] { 0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x01 };/*ww  w  . j  a  va2s.c  o m*/

    Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
    KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");

    generator.init(192);

    Key encryptionKey = generator.generateKey();

    System.out.println("key   : " + Utils.toHex(encryptionKey.getEncoded()));
    System.out.println("input : " + new String(input));

    // encryption pass
    cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
    ctLength += cipher.doFinal(cipherText, ctLength);

    // decryption pass
    Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
    ptLength += cipher.doFinal(plainText, ptLength);
    System.out.println("plain : " + new String(plainText) + " bytes: " + ptLength);
}

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From source file:Main.java

/**
 * Returns true if the key is an elliptic curve public or private key.
 *//*from  w ww.  j  a  v  a2  s . c o  m*/
public static boolean isEcKey(Key key) {
    return "EC".equals(key.getAlgorithm());
}

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From source file:Main.java

/**
 * Returns true if the key is an RSA public or private key.
 *//*w  ww.j a v  a2s .c  o  m*/
public static boolean isRsaKey(Key key) {
    return "RSA".equals(key.getAlgorithm());
}

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From source file:Main.java

public static String formatKey(Key key) {
    String algo = key.getAlgorithm();
    String fmt = key.getFormat();
    byte[] encoded = key.getEncoded();
    return "Key[algorithm=" + algo + ", format=" + fmt + ", bytes=" + encoded.length + "]";
}

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From source file:Main.java

private static String getSignatureAlgorithm(Key key) throws Exception {
    if ("EC".equals(key.getAlgorithm())) {
        int curveSize;
        KeyFactory factory = KeyFactory.getInstance("EC");

        if (key instanceof PublicKey) {
            ECPublicKeySpec spec = factory.getKeySpec(key, ECPublicKeySpec.class);
            curveSize = spec.getParams().getCurve().getField().getFieldSize();
        } else if (key instanceof PrivateKey) {
            ECPrivateKeySpec spec = factory.getKeySpec(key, ECPrivateKeySpec.class);
            curveSize = spec.getParams().getCurve().getField().getFieldSize();
        } else {//from   w  w w. j a  v a2 s.  c  o m
            throw new InvalidKeySpecException();
        }

        if (curveSize <= 256) {
            return "SHA256withECDSA";
        } else if (curveSize <= 384) {
            return "SHA384withECDSA";
        } else {
            return "SHA512withECDSA";
        }
    } else if ("RSA".equals(key.getAlgorithm())) {
        return "SHA256withRSA";
    } else {
        throw new IllegalArgumentException("Unsupported key type " + key.getAlgorithm());
    }
}

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From source file:com.kuzumeji.platform.standard.SecurityServiceTest.java

private static String dumpKeyPair(final Key key) {
    return MessageFormat.format("?:{0} ?:{1} ?:{2}", key.getAlgorithm(), key.getFormat(),
            Hex.encodeHexString(key.getEncoded()));
}

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From source file:com.google.api.auth.DefaultJwksSupplierTest.java

private static void assertKeysEqual(Key expected, Key actual) {
    assertEquals(expected.getAlgorithm(), actual.getAlgorithm());
    assertEquals(new String(Hex.encode(expected.getEncoded())), new String(Hex.encode(actual.getEncoded())));
    assertEquals(expected.getFormat(), actual.getFormat());
}

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From source file:net.fender.crypto.CryptoUtil.java

/**
 * NB: Ciphers are not thread safe. Don't reuse the instance returned by
 * this method in multiple threads.//  ww w.j  ava2s. c o  m
 * 
 * @param keyName
 * @param mode
 * @return
 * @throws GeneralSecurityException
 */
public static Cipher getSystemPropertyCipher(String keyName, int mode) throws GeneralSecurityException {
    Key key = getSystemPropertyKey(keyName);
    Cipher cipher = Cipher.getInstance(key.getAlgorithm());
    cipher.init(mode, key);
    return cipher;
}

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From source file:net.fender.crypto.CryptoUtil.java

/**
 * @param keyName// w  w w  .j a  va  2s  .c om
 * @param plaintext
 * @return
 * @throws GeneralSecurityException
 */
public static String encryptUsingSystemPropertyKey(String keyName, String plaintext)
        throws GeneralSecurityException {
    Key key = getSystemPropertyKey(keyName);
    Cipher cipher = Cipher.getInstance(key.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] encryptedByes = cipher.doFinal(plaintext.getBytes());
    String encrypted = new String(Base64.encodeBase64(encryptedByes));
    return encrypted;
}

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