微信小程序手机号java解密encryptedData

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import java.security.AlgorithmParameters;

import java.security.Security;

import java.security.spec.AlgorithmParameterSpec;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;



@Slf4j
public class DecodeSessionKeyUtil {


    
    public static JSONObject decryptData(String encryptedData, String iv, String sessionKey) {
        // 被加密的数据
        byte[] dataByte = base64.decode(encryptedData);
        // 加密秘钥
        byte[] keyByte = base64.decode(sessionKey);
        // 偏移量
        byte[] ivByte = base64.decode(iv);
        try {
            // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSONObject.parseObject(result);
            }
        } catch (Exception e) {
            log.error("==== 解密出错{}",e.getMessage());
        }
        return null;
    }
}