58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
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package fadada
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"sort"
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"strings"
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)
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const (
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signTypeHMACSHA256 = "HMAC-SHA256"
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apiSubVersion = "5.1"
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)
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// SignByMap 法大大 HMAC-SHA256 签名（与官方 SDK 算法一致）
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// 1) 对 map key 字典序排序，拼接 key=value&...（跳过空值）
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// 2) signText = hex(SHA256(signContent))
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// 3) signKey = HMAC-SHA256(timestamp, appSecret) 原始字节
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// 4) signature = lowercase(hex(HMAC-SHA256(signText, signKey)))
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func SignByMap(headMap map[string]string, timestamp, appSecret string) string {
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signContent := sortMapForSign(headMap)
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signText := sha256Hex(signContent)
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secretSigning := hmacSHA256Bytes(timestamp, []byte(appSecret))
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return strings.ToLower(hmacSHA256Hex(signText, secretSigning))
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}
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func sortMapForSign(headMap map[string]string) string {
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keys := make([]string, 0, len(headMap))
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for k := range headMap {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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parts := make([]string, 0, len(keys))
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for _, k := range keys {
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if v := headMap[k]; v != "" {
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parts = append(parts, k+"="+v)
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}
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}
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return strings.Join(parts, "&")
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}
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func sha256Hex(src string) string {
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sum := sha256.Sum256([]byte(src))
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return hex.EncodeToString(sum[:])
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}
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func hmacSHA256Bytes(data string, secret []byte) []byte {
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h := hmac.New(sha256.New, secret)
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h.Write([]byte(data))
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return h.Sum(nil)
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}
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func hmacSHA256Hex(data string, secret []byte) string {
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return hex.EncodeToString(hmacSHA256Bytes(data, secret))
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}
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