如何在java中对mpesa passcode进行散列和编码

Question

我正在尝试动态生成一个密码，该密码将随每个api请求一起发送到mpesa api。根据文档，我需要首先连接提供的密钥与时间戳和商家id，然后做一个sha256来获得一个哈希密码，然后我应该编码到base64然而，在Java中这样做返回一个错误的编码字符串，而在PHP中类似的过程和代码工作，我会错在哪里呢？

import org.apache.commons.codec.binary.Base64;
import org.apache.cxf.headers.Header;
import org.apache.cxf.jaxb.JAXBDataBinding;
import javax.xml.bind.JAXBException;
import javax.xml.namespace.QName;
import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;



public class CheckoutHeaderBuilder {

    public static Header buildHeader(String merchantId, String passKey, String timestamp) throws JAXBException, NoSuchAlgorithmException, UnsupportedEncodingException {
    String hashedEncodedPass = Base64.encodeBase64String(MessageDigest.getInstance("SHA-256").digest((merchantId + passKey + timestamp).getBytes("utf-8")));

    List<Header> headers = new ArrayList<>();
    CheckOutHeader checkOutHeader = new CheckOutHeader();
    checkOutHeader.setTIMESTAMP(timestamp);
    checkOutHeader.setMERCHANTID(merchantId);
    checkOutHeader.setPASSWORD(hashedEncodedPass);
    return new Header(new QName("tns:ns", "CheckOutHeader"), checkOutHeader, new JAXBDataBinding(CheckOutHeader.class));

    }

}

Answer 1

嗨，Japheth Ongeri Inkalimeva，你不需要使用SHA256加密。在发送Lipa na M-Pesa Online Payment API请求时，您可能不需要设置新密码。

我已经修改了你的代码，删除了SHA256加密。

import org.apache.commons.codec.binary.Base64;
import org.apache.cxf.headers.Header;
import org.apache.cxf.jaxb.JAXBDataBinding;
import javax.xml.bind.JAXBException;
import javax.xml.namespace.QName;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;


public class CheckoutHeaderBuilder  {

    public static Header buildHeader(String merchantId, String passKey, String timestamp) throws JAXBException, NoSuchAlgorithmException, UnsupportedEncodingException {
    String hashedEncodedPass = Base64.encodeBase64String((merchantId + passKey + timestamp).getBytes("utf-8"));

    List<Header> headers = new ArrayList<>();
    CheckOutHeader checkOutHeader = new CheckOutHeader();
    checkOutHeader.setTIMESTAMP(timestamp);
    checkOutHeader.setMERCHANTID(merchantId);
    checkOutHeader.setPASSWORD(hashedEncodedPass);
    return new Header(new QName("tns:ns", "CheckOutHeader"), checkOutHeader, new JAXBDataBinding(CheckOutHeader.class));

    }

}

Answer 2

示例编码SHA256

import java.nio.charset.StandardCharsets;
import com.google.common.hash.Hashing;

String password = “123456”;
Hashing.sha256().hashString(password, StandardCharsets.UTF_8).toString();

希望能帮到你

Answer 3

您可以通过以下方式对Mpesa的密码进行编码：

import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class MpesaUtils {

    public static String getMpesaEncodedPassword(String lipaNaMpesaShortCode,
                              String password, String timeStamp) {
        StringBuilder sb = new StringBuilder();
        sb.append(lipaNaMpesaShortCode).append(password).append(timeStamp);

        byte[] bytes = sb.toString().getBytes(StandardCharsets.ISO_8859_1);
        return Base64.getEncoder().encodeToString(bytes);
    }
}

使用示例：

    String lnmShortCode = "your lipa na mpesa short code here";
    String password = "your password here";
    String timeStamp = getTimeStamp();

    String encodedPassword = MpesaUtils.getMpesaEncodedPassword(lnmShortCode, password, timeStamp);