/**
package main
import (
    "github.com/google/uuid"
    "time"
    "crypto/hmac"
    "crypto/sha256"
    "encoding/hex"
)**/
//AK，SK为接入时分配的APPID及秘钥，接入方根据实际情况改变取值 
//重要：不要在客户端暴露SK，否则有信息泄露等一系列安全风险
ak := "lf2a69d4dff7dc9f3a462719da8bb943";
sk := "yf4xqjv0bspsrlzh2hq6yxibqauvaciq";
//nonce跟据业务实际情况指定
nonce := uuid.New().String()
//时间戳为精确到秒，故JAVA需要转换
timestamp := time.Now().Unix()
signType := "HMAC-SHA256";
contentMd5 := "57e37568a871d537d25cd19a9dc10cb7";
//此种拼接效率效低，这里为了更好的展示，故采用字符串相加方式，业务式可根据自己的需求调整算法
joinedString := ak + "&" + timestamp + "&" + nonce + "&" + signType + "&" + contentMd5

//以sk为密钥进行hmac_sha256加密，业务方可自行选择类库，这里只列出一种方式
keys := []byte(sk)
h := hmac.New(sha256.New,keys)
h.Write([]byte(joinedString))

sign := hex.EncodeToString(h.Sum(nil))

//AK，SK为接入时分配的APPID及秘钥，接入方根据实际情况改变取值 
//重要：不要在客户端暴露SK，否则有信息泄露等一系列安全风险
String ak = "lf2a69d4dff7dc9f3a462719da8bb943";
String sk = "yf4xqjv0bspsrlzh2hq6yxibqauvaciq";
//nonce跟据业务实际情况指定
String nonce = UUIDGenerator.getUUID();

String timestamp = String.valueOf(date.getTime()/1000);
String signType = "HMAC-SHA256";
String contentMd5 = "57e37568a871d537d25cd19a9dc10cb7";
//此种拼接效率效低，这里为了更好的展示，故采用字符串相加方式，业务式可根据自己的需求调整算法
String joinedString = ak + "&" + timestamp + "&" + nonce + "&" + signType + "&" + contentMd5

//以sk为密钥进行hmac_sha256加密，业务方可自行选择类库，这里只列出一种方式
ac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
sha256_HMAC.init(sk);
byte[] array = sha256_HMAC.doFinal(data.getBytes(StandardCharsets.UTF_8));
StringBuilder sb = new StringBuilder();
for (byte item : array) {
    sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
}
String sign = sb.toString();

//AK，SK为接入时分配的APPID及秘钥，接入方根据实际情况改变取值 
//重要：不要在客户端暴露SK，否则有信息泄露等一系列安全风险
$ak = "lf2a69d4dff7dc9f3a462719da8bb943";
$sk = "yf4xqjv0bspsrlzh2hq6yxibqauvaciq";
//nonce跟据业务实际情况指定
$nonce = com_create_guid();
$timestamp = time();
$signType = "HMAC-SHA256";
$contentMd5 = "57e37568a871d537d25cd19a9dc10cb7";
$joinedString = $ak ."&" . $timestamp . "&" . $nonce . "&" . $signType . "&" . $contentMd5
$sign =  hash_hmac('sha256',$joinedString, $sk);

package main
import (
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
)

type Content struct {
    A string `json:"a"`
    B int32 `json:"b"`
    C string `json:"c"`
}
type Body struct {
    BxeoContent Content `json:"bxeoContent"`
}

func main()  {
    bodyArr := &Body{Content{A:"abc",B:123,C:"中文示例",}
    //body 为请求body的内容 ，此时为{"bxeoContent":{"a":"abc","b":123,"c":"中文示例"}}
    body, _ := json.Marshal(bodyArr)
    //md5body为准备进行md5计算的内容
    md5Body,_ := json.Marshal(bodyArr.BxeoContent)
    //contentMd5为header中md5的值 
    contentMd5 := md5.Sum(md5Body)
}

$arrParams = array();
$arrParams['a'] = "abc";
$arrParams['b'] = 123;
$arrParams['c'] = "中文示例";
$arrBody = array(
    'bxeoContent' => $arrParams,
);

$body= json_encode($arrBody);
$contentMd5 = md5(stripslashes(json_encode($arrParams, JSON_UNESCAPED_UNICODE)));