package string

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"strings"
)

func HmacSha256Hex(key, strToSign string) string {
	hasher := hmac.New(sha256.New, []byte(key))
	hasher.Write([]byte(strToSign))
	return hex.EncodeToString(hasher.Sum(nil))
}

func ToLower(str string) string {
	return strings.ToLower(str)
}

func ToUpper(str string) string {
	return strings.ToUpper(str)
}