org.scene.wx.provider.WxDecryptUtils Maven / Gradle / Ivy

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package org.scene.wx.provider;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;


class WxDecryptUtils {


    private static String AesDecrypt(String src, byte[] key, byte[] ivParameter) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec(ivParameter);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] encrypted1 = Base64.getDecoder().decode(src);//先用base64解密
        byte[] original = cipher.doFinal(encrypted1);
        return new String(original, StandardCharsets.UTF_8);
    }


    public static String decryptData(String sessionKey, String encryptedData, String iv) {
        byte[] sKey = Base64.getDecoder().decode(sessionKey);
        byte[] ivKey = Base64.getDecoder().decode(iv);

        try {
            return AesDecrypt(encryptedData, sKey, ivKey);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}