Go

package main

import (
    "fmt"
    "time"
    "strconv"
    "crypto/hmac"
    "crypto/sha512"
    "io/ioutil"
    "net/http"
    "encoding/hex"
    "net/url"
    "strings"
)

var key = "<your_key>"
var secret = "<your_secret>"

func main() {

    uri := "https://api.zaif.jp/tapi"
    values := url.Values{}
    values.Add("method", "get_info")
    values.Add("nonce", strconv.FormatInt(time.Now().Unix(), 10))

    encodedParams := values.Encode()
    req, _ := http.NewRequest("POST", uri, strings.NewReader(encodedParams))

    hash := hmac.New(sha512.New, []byte(secret))
    hash.Write([]byte(encodedParams))
    signature := hex.EncodeToString(hash.Sum(nil))

    req.Header.Add("Key", key)
    req.Header.Add("Sign", signature)
    client := new(http.Client)
    resp, _ := client.Do(req)
    defer resp.Body.Close()

    byteArray, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(byteArray))
}