/**
* encryption

* Encrypt with the public key
*
* @param data
* @param sdkEphemPubKey
* @return
* @throws Exception
*/
public static String encrypt(byte[] data) throws Exception {
String ef = UUID.randomUUID().toString();
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(“EC”);

	// Initialize the key generator according to the ecnodeRules rule
	// Generates a 128-bit random source based on an array of bytes passed in
	SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
	random.setSeed(ef.getBytes());
	keyPairGenerator.initialize(256, random);
	
	// Generates a temporary key pair
	KeyPair keyPair = keyPairGenerator.generateKeyPair();
	System.out.println("Generates a temporary key pair " + keyPair);
	
	// The public key of the temporary key pair
	ECPublicKey ecPublicKey = (ECPublicKey) keyPair.getPublic();
	System.out.println("public key: " + ecPublicKey);
	
	// The private key of the temporary key pair
	ECPrivateKey ecPrivateKey = (ECPrivateKey) keyPair.getPrivate();
	System.out.println("private key: " + ecPrivateKey);
	ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(ecPublicKey.getW(), ecPublicKey.getParams());
	System.out.println("ecPublicKeySpec : " + ecPublicKeySpec);
	
	// Encrypt data
	// TODO Chipher does not support EC algorithm failed to implement
	Cipher cipher = new NullCipher();
	
	// Cipher.getInstance(ALGORITHM, keyFactory.getProvider());
	cipher.init(Cipher.ENCRYPT_MODE, ecPublicKey, ecPublicKeySpec.getParams());
	byte[] bytes = cipher.doFinal(data);
	String dataString = fromBytesToHex(bytes);
	return dataString;
}

主方法调用加密
public static void main(String[] args) {
String a ="{“messageType”:“a”,“messageVersion”:“b”,“threeDSRequestorID”:“c”,“acctNumber”:“d”}";
byte[] b = a.getBytes();
System.out.println(“11b:”+b);
try {
String axs = encrypt(b);
System.out.println(axs);
} catch (Exception e) {
e.printStackTrace();
}
}
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