微信小程序获取手机号解密详解(100%)

public static void main(String[] args) throws Exception {
    String sessionKey = " ";
    String encryptedData = " ";
    String iv = " ";
    String decrypt = AESUtils.decrypt(encryptedData, sessionKey, iv, "UTF-8");
    System.out.println(decrypt);
}


public class AESUtils {

    public static String decrypt(String encryptedData, String sessionKey, String iv, String encodingFormat) throws Exception {

        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

            BASE64Decoder base64Decoder = new BASE64Decoder();

            byte[] _encryptedData = base64Decoder.decodeBuffer(encryptedData);

            byte[] _sessionKey = base64Decoder.decodeBuffer(sessionKey);

            byte[] _iv = base64Decoder.decodeBuffer(iv);

            SecretKeySpec secretKeySpec = new SecretKeySpec(_sessionKey, "AES");

            IvParameterSpec ivParameterSpec = new IvParameterSpec(_iv);

            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);

            byte[] original = cipher.doFinal(_encryptedData);

            byte[] bytes = WxPKCS7Encoder.decode(original);

            String originalString = new String(bytes, encodingFormat);  return originalString;

        } catch (Exception ex) {

            ex.printStackTrace();
            return null;

        }

    }

}

 

 

public class WxPKCS7Encoder {


    static Charset CHARSET = Charset.forName("utf-8");

    static int BLOCK_SIZE = 32;

    /**
     * 获得对明文进行补位填充的字节.
     *
     * @param count 需要进行填充补位操作的明文字节个数
     * @return 补齐用的字节数组
     */
    static byte[] encode(int count) {
        // 计算需要填充的位数
        int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
        if (amountToPad == 0) {
            amountToPad = BLOCK_SIZE;
        }
        // 获得补位所用的字符
        char padChr = chr(amountToPad);
        String tmp = new String();
        for (int index = 0; index < amountToPad; index++) {
            tmp += padChr;
        }
        return tmp.getBytes(CHARSET);
    }

    /**
     * 删除解密后明文的补位字符
     *
     * @param decrypted 解密后的明文
     * @return 删除补位字符后的明文
     */
    static byte[] decode(byte[] decrypted) {
        int pad = (int) decrypted[decrypted.length - 1];
        if (pad < 1 || pad > 32) {
            pad = 0;
        }
        return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
    }

    /**
     * 将数字转化成ASCII码对应的字符，用于对明文进行补码
     *
     * @param a 需要转化的数字
     * @return 转化得到的字符
     */
    static char chr(int a) {

        byte target = (byte) (a & 0xFF);

        return (char) target;

    }
}