/**
 * 生成签名信息
 * @param secretKey 产品私钥
 * @param params 接口请求参数名和参数值map，不包括signature参数名
 * @return
 */
public static String genSignature(String secretKey, Map<String, String> params){
    // 1. 参数名按照ASCII码表升序排序
    String[] keys = params.keySet().toArray(new String[0]);
    Arrays.sort(keys);

    // 2. 按照排序拼接参数名与参数值
    StringBuilder sb = new StringBuilder();
    for (String key : keys) {
        sb.append(key).append(params.get(key));
    }
    // 3. 将secretKey拼接到最后
    sb.append(secretKey);

    // 4. MD5是128位长度的摘要算法，转换为十六进制之后长度为32字符
    return DigestUtils.md5Hex(sb.toString().getBytes("UTF-8"));
}

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""生成签名信息
Args:
    secretKey 产品私钥
    params 接口请求参数，不包括signature参数
"""
def gen_signature(secretKey, params=None):
        params_str = ""
        for k in sorted(params.keys()):
            params_str += str(k)+ str(params[k])

        params_str += secretKey
        # python2 语法：  return hashlib.md5(params_str).hexdigest()
        return hashlib.md5(params_str.encode("utf-8")).hexdigest()

/**
 * 生成签名信息
 * $secretKey 产品私钥
 * $params 接口请求参数，不包括signature参数
 */
function gen_signature($secretKey,$params){
    ksort($params);
    $buff="";
    foreach($params as $key=>$value){
        $buff .=$key;
        $buff .=$value;
    }
    $buff .= $secretKey;
    return md5(mb_convert_encoding($buff, "utf8", "auto"));
}

// 根据secretKey和parameters生成签名
public static String genSignature(String secretKey, Dictionary<String, String> parameters)
{
    parameters = parameters.OrderBy(o => o.Key).ToDictionary(o => o.Key, p => p.Value);
    StringBuilder builder = new StringBuilder();
    foreach (KeyValuePair<String, String> kv in parameters)
    {
        builder.Append(kv.Key).Append(kv.Value);
    }
    builder.Append(secretKey);
    String tmp = builder.ToString();
    MD5 md5 = new MD5CryptoServiceProvider();
    byte[] result = md5.ComputeHash(Encoding.UTF8.GetBytes(tmp));
    builder.Clear();
    foreach (byte b in result)
    {
        builder.Append(b.ToString("x2").ToLower());
    }
    return builder.ToString();
}

var genSignature=function(secretKey,paramsJson){
    var sorter=function(paramsJson){
        var sortedJson={};
        var sortedKeys=Object.keys(paramsJson).sort();
        for(var i=0;i<sortedKeys.length;i++){
            sortedJson[sortedKeys[i]] = paramsJson[sortedKeys[i]]
        }
        return sortedJson;
    }
    var sortedParam=sorter(paramsJson);
    var needSignatureStr="";
    for(var key in sortedParam){
        var value=sortedParam[key];
        needSignatureStr=needSignatureStr+key+value;
    }
    needSignatureStr+=secretKey;
    var md5er = crypto.createHash('md5');//MD5加密工具
    md5er.update(needSignatureStr,"UTF-8");
    return md5er.digest('hex');
};

//根据secretKey和parameters生成签名

func genSignature(secretKey string, params map[string]string) string {
	var keys []string
	for key, _ := range params {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	buf := bytes.NewBufferString("")
	for _, key := range keys {
		buf.WriteString(key + params[key])
	}
	buf.WriteString(secretKey)
	has := md5.Sum(buf.Bytes())
	return fmt.Sprintf("%x", has)
}