From 249a81b2f4c9e84b5228484e26dff6678b149e43 Mon Sep 17 00:00:00 2001
From: renzhiyuan <465386466@qq.com>
Date: Mon, 17 Aug 2026 17:18:13 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=96=87=E4=BB=B6:=20intelli?=
 =?UTF-8?q?gence=5Ffinance=5Fv1/crypto.go?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

---
 intelligence_finance_v1/crypto.go | 67 +++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 intelligence_finance_v1/crypto.go

diff --git a/intelligence_finance_v1/crypto.go b/intelligence_finance_v1/crypto.go
new file mode 100644
index 0000000..24ac219
--- /dev/null
+++ b/intelligence_finance_v1/crypto.go
@@ -0,0 +1,67 @@
+package intelligence_finance_v1
+
+import (
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"math/big"
+	"sort"
+	"strings"
+	"time"
+)
+
+// GenerateTimestamp 生成秒级时间戳字符串
+func GenerateTimestamp() string {
+	return fmt.Sprintf("%d", time.Now().Unix())
+}
+
+// GenerateNonce 生成指定长度的加密安全随机字符串
+func GenerateNonce(length int) (string, error) {
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	b := make([]byte, length)
+	for i := range b {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
+		if err != nil {
+			return "", err
+		}
+		b[i] = charset[num.Int64()]
+	}
+	return string(b), nil
+}
+
+// HmacSHA256Base64 使用HmacSHA256算法对数据进行签名，返回Base64编码结果
+func HmacSHA256Base64(secret, data string) string {
+	mac := hmac.New(sha256.New, []byte(secret))
+	mac.Write([]byte(data))
+	return base64.StdEncoding.EncodeToString(mac.Sum(nil))
+}
+
+// BuildSignString 按字典序排序拼接参数（排除空值和签名字段）
+func BuildSignString(params map[string]string) string {
+	keys := make([]string, 0, len(params))
+	for k, v := range params {
+		if v != "" && k != "sign" && k != "signature" && k != "x-bfl-signature" {
+			keys = append(keys, k)
+		}
+	}
+	sort.Strings(keys)
+
+	var parts []string
+	for _, k := range keys {
+		parts = append(parts, fmt.Sprintf("%s=%s", k, params[k]))
+	}
+	return strings.Join(parts, "&")
+}
+
+// BuildSignStringOrdered 按固定顺序拼接参数
+func BuildSignStringOrdered(params map[string]string, orderedKeys []string) string {
+	var parts []string
+	for _, k := range orderedKeys {
+		if v, ok := params[k]; ok && v != "" {
+			parts = append(parts, fmt.Sprintf("%s=%s", k, v))
+		}
+	}
+	return strings.Join(parts, "&")
+}
\ No newline at end of file