com.firefly.wechat.utils.AesUtils Maven / Gradle / Ivy

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package com.firefly.wechat.utils;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.Security;

/**
 * @author Pengtao Qiu
 */
abstract public class AesUtils {

    static {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    }

    public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", BouncyCastleProvider.PROVIDER_NAME);
            Key sKeySpec = new SecretKeySpec(keyByte, "AES");
            cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));
            return cipher.doFinal(content);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }

    public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
        AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
        params.init(new IvParameterSpec(iv));
        return params;
    }
}