aes Encrypt Hex - Android java.security

Android examples for java.security:AES

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Description

aes Encrypt Hex

Demo Code


import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Locale;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;

public class Main{
    /**//from w w w.j av  a  2s .  co m
     * UTF-8
     */
    public static final String UTF_8 = "UTF-8";
    
    public static String aesEncryptHex(String content, String key)
            throws Exception {
        if (StringUtils.isBlank(content) || StringUtils.isBlank(key)) {
            throw new Exception("illegal params.");
        }
        return bytesToHexString(aes(Cipher.ENCRYPT_MODE,
                content.getBytes(UTF_8), key.getBytes(UTF_8)));
    }
    
    public static String bytesToHexString(byte[] bytes) {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < bytes.length; ++i) {
            int v = bytes[i] & 0xff;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }
    
    public static byte[] aes(int opmode, byte[] content, byte[] key)
            throws Exception {
        SecureRandom secureRandom = null;
        secureRandom = SecureRandom.getInstance("SHA1PRNG", "Crypto");
        secureRandom.setSeed(key);
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128, secureRandom);
        Cipher cipher = Cipher.getInstance("AES/ECB/ZeroBytePadding");
        cipher.init(opmode, new SecretKeySpec(kgen.generateKey()
                .getEncoded(), "AES"));
        return cipher.doFinal(content);
    }
}

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