美团企业版免登签名

1. Java签名示例

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.21</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.7</version>
</dependency>

import org.apache.commons.lang3.RandomStringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URLEncoder;
import java.security.interfaces.RSAPrivateKey;
import java.text.SimpleDateFormat;
import java.util.Date;

//调用该类main方法前，需要通过com.meituan.sqt.h5Access.RsaUtil.main生成公钥和私钥
public class SqtH5Access {
    private static Logger logger = LoggerFactory.getLogger(SqtH5Access.class);
    /**
     * 获取h5免登url
     * @param url 美团企业版接口地址
     * @param privateKey 私钥，可通过RsaUtil.genKey()生成
     * @param appkey
     * @param entId 企业Id，美团企业版提供
     * @param productType
     * @param staffNo 该字段与企业员工唯一标志对应，可能为staffPhoneNo字段
     */
    public static String getH5AccessUrl(String url, String privateKey, String appkey, Integer entId, String productType, String staffNo){
        try {
            // params是待签名文本，包括所有需要签名的参数，不包括value为空的参数、signature参数
            // 另外，params中，每一个键值对按key从a-z进行排序，首字母相同，则比较下一个，以此类推
            String params =  "appKey=" + appkey + "&entId=" + entId + "&nounce=" + getNounce() + "&productType=" + productType + "&requestTime=" + getRequestTime()  + "&staffNo=" + staffNo;
            RSAPrivateKey rsaPrivateKey = RsaUtil.loadPrivateKey(privateKey);
            String signature = RsaUtil.sign(params.getBytes(), rsaPrivateKey);
            //signature参数需encode
            String h5AccessUrl = url+"?"+params + "&signature="+ URLEncoder.encode(signature,"utf-8");
            return h5AccessUrl;
        } catch (Exception e) {
            logger.error("获取h5AccessUrl失败",e);
        }
        return null;
    }
    private static String getRequestTime(){
        SimpleDateFormat formatter= new SimpleDateFormat("yyyyMMddHHmmss");
        Date now = new Date(System.currentTimeMillis());
        return formatter.format(now);
    }
    private static String getNounce(){
        return RandomStringUtils.random(36, true, true);
    }


    public static void main(String[] args) {
        //接口地址
        String url = "https://m-sqt.meituan.com/open/commonaccess/access";
        //美团企业版提供
        String appkey = null;
        //私钥，通过 com.meituan.sqt.h5Access.RsaUtil.main 生成
        String privateKey = null;
        // 企业Id，美团企业版提供
        Integer entId = null;
        // 详情见业务接口描述
        String productType = null;
        // 与企业员工唯一标志对应，可能为staffPhoneNo字段
        String staffNo = null;
        String h5AccessUrl = SqtH5Access.getH5AccessUrl(url, privateKey, appkey, entId, productType, staffNo);
        System.out.println(h5AccessUrl);
    }
}

2. 签名工具类

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.21</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.7</version>
</dependency>

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class RsaUtil {

    public static final String ENCRYPT_ALGORTHM = "RSA";
    public static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;


    public static void genKey() throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ENCRYPT_ALGORTHM);
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();

        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

        //公钥 发送给美团企业版
        String publicKeyStr = new String(Base64.encodeBase64(publicKey.getEncoded()));
        //私钥 企业保存 用于签名
        String privateKeyStr = new String(Base64.encodeBase64(privateKey.getEncoded()));
        System.out.println("公钥，发送给美团企业版：" + publicKeyStr);
        System.out.println("私钥，企业保存：" + privateKeyStr);
    }



    public static RSAPublicKey loadPublicKey(String publicKeyStr) throws Exception {
        try {
            byte[] buffer = Base64.decodeBase64(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance(ENCRYPT_ALGORTHM);
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法", e);
        } catch (InvalidKeySpecException e) {
            throw new Exception("公钥非法", e);
        } catch (NullPointerException e) {
            throw new Exception("公钥数据为空", e);
        }
    }

    public static RSAPrivateKey loadPrivateKey(String privateKeyStr) throws Exception {
        try {
            byte[] buffer = Base64.decodeBase64(privateKeyStr);
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法", e);
        } catch (InvalidKeySpecException e) {
            throw new Exception("私钥非法", e);
        } catch (NullPointerException e) {
            throw new Exception("私钥数据为空", e);
        }
    }

    /**
     * 用私钥对信息生成数字签名
     *
     * @param data
     *            //加密数据
     * @param privateKey
     *            //私钥
     * @return
     * @throws Exception
     */
    public static String sign(byte[] data, RSAPrivateKey privateKey) throws Exception {

        // 用A方私钥对信息生成数字签名
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateKey);
        signature.update(data);

        return Base64.encodeBase64String(signature.sign());
    }

    /**
     * 用公钥验证签名
     *
     * @param data
     *            //加密数据
     * @param publicKey
     *            //公钥
     * @param sign
     *            //签名
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeyException
     * @throws SignatureException
     * @throws Exception
     */
    public static boolean validate(byte[] data, RSAPublicKey publicKey, String sign) throws Exception {

        Signature signature;
        signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(publicKey);
        signature.update(data);

        return signature.verify(Base64.decodeBase64(sign));

    }

    public static boolean validate(byte[] data, String publicKey, String sign) throws Exception {

        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(loadPublicKey(publicKey));
        signature.update(data);

        return signature.verify(Base64.decodeBase64(sign));
    }
    /**
     * <P>
     * 私钥解密
     * </p>
     *
     * @param privateKey 私钥
     * @return
     * @throws Exception
     */
    public static String decryptByPrivateKey(String encryptedString, RSAPrivateKey privateKey)
            throws Exception {
        Cipher cipher = Cipher.getInstance(ENCRYPT_ALGORTHM);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] encryptedData  = Base64.decodeBase64(encryptedString);
        int inputLen = encryptedData.length;
        byte[] decryptedData;
        ByteArrayOutputStream out = null;
        try {
            out = new ByteArrayOutputStream();
            int offSet = 0;
            byte[] cache;
            int i = 0;
            // 对数据分段解密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                    cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_DECRYPT_BLOCK;
            }
            decryptedData = out.toByteArray();
        } finally {
            out.close();
        }
        return new String(decryptedData, "UTF-8");
    }

    /**
     * <p>
     * 公钥解密
     * </p>
     *
     * @param publicKey 公钥
     * @return
     * @throws Exception
     */
    public static String decryptByPublicKey(String encryptedString, RSAPublicKey publicKey)
            throws Exception {
        Cipher cipher = Cipher.getInstance(ENCRYPT_ALGORTHM);
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] encryptedData = Base64.decodeBase64(encryptedString);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = null;
        byte[] decryptedData;
        try {
            out = new ByteArrayOutputStream();
            int offSet = 0;
            byte[] cache;
            int i = 0;
            // 对数据分段解密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                    cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_DECRYPT_BLOCK;
            }
            decryptedData = out.toByteArray();
        } finally {
            out.close();
        }

        return  new String(decryptedData, "UTF-8");
    }

    /**
     * <p>
     * 公钥加密
     * </p>
     *
     * @param publicKey 公钥
     * @return
     * @throws Exception
     */
    public static String encryptByPublicKey(String plainText, RSAPublicKey publicKey)
            throws Exception {
        byte[] data = plainText.getBytes("UTF-8");
        // 对数据加密
        Cipher cipher = Cipher.getInstance(ENCRYPT_ALGORTHM);
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int inputLen = data.length;
        ByteArrayOutputStream out = null;
        byte[] encryptedData;
        try {
            out = new ByteArrayOutputStream();
            int offSet = 0;
            byte[] cache;
            int i = 0;
            // 对数据分段加密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                    cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_ENCRYPT_BLOCK;
            }
            encryptedData = out.toByteArray();
        } finally {
            out.close();
        }
        return  Base64.encodeBase64String(encryptedData);
    }

    /**
     * <p>
     * 私钥加密
     * </p>
     *
     * @param privateKey
     * @return
     * @throws Exception
     */
    public static String encryptByPrivateKey(String plainText, RSAPrivateKey privateKey)
            throws Exception {
        byte[] data = plainText.getBytes("UTF-8");
        Cipher cipher = Cipher.getInstance(ENCRYPT_ALGORTHM);
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        int inputLen = data.length;
        ByteArrayOutputStream out = null;
        byte[] encryptedData;
        try {
            out = new ByteArrayOutputStream();
            int offSet = 0;
            byte[] cache;
            int i = 0;
            // 对数据分段加密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                    cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_ENCRYPT_BLOCK;
            }
            encryptedData = out.toByteArray();
        } finally {
            out.close();
        }

        return Base64.encodeBase64String(encryptedData);
    }

    //获取公钥和私钥
    public static void main(String[] args) throws Exception {
        genKey();
    }
}