From 39a8373a17fbd232fc861948fbb8917a5df4895e Mon Sep 17 00:00:00 2001
From: renzhiyuan <465386466@qq.com>
Date: Thu, 23 Jul 2026 17:07:10 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=96=87=E4=BB=B6:=20ymt=5Fv?=
 =?UTF-8?q?3/crypto.go?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ymt_v3/crypto.go | 550 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 550 insertions(+)
 create mode 100644 ymt_v3/crypto.go

diff --git a/ymt_v3/crypto.go b/ymt_v3/crypto.go
new file mode 100644
index 0000000..3b02972
--- /dev/null
+++ b/ymt_v3/crypto.go
@@ -0,0 +1,550 @@
+package ymt_v3
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/aes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/json"
+	"encoding/pem"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strings"
+	"time"
+)
+
+// ============================================================
+// 时间戳工具
+// ============================================================
+
+// GenerateTimestamp 生成格式为 yyyy-MM-dd HH:mm:ss 的时间戳
+func GenerateTimestamp() string {
+	return time.Now().Format("2006-01-02 15:04:05")
+}
+
+// ============================================================
+// PKCS7 填充/去填充
+// ============================================================
+
+func pkcs7Padding(data []byte, blockSize int) []byte {
+	padding := blockSize - len(data)%blockSize
+	padText := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(data, padText...)
+}
+
+func pkcs7UnPadding(data []byte) ([]byte, error) {
+	length := len(data)
+	if length == 0 {
+		return nil, fmt.Errorf("数据为空")
+	}
+	padding := int(data[length-1])
+	if padding > length || padding == 0 {
+		return nil, fmt.Errorf("无效的填充")
+	}
+	for i := length - padding; i < length; i++ {
+		if data[i] != byte(padding) {
+			return nil, fmt.Errorf("无效的填充")
+		}
+	}
+	return data[:length-padding], nil
+}
+
+// ============================================================
+// AES-ECB 加密/解密
+// ============================================================
+
+// AESECBEncrypt AES-ECB模式加密，返回base64编码
+func AESECBEncrypt(plaintext []byte, key []byte) (string, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", fmt.Errorf("创建AES cipher失败: %v", err)
+	}
+
+	padded := pkcs7Padding(plaintext, aes.BlockSize)
+
+	ciphertext := make([]byte, len(padded))
+	for i := 0; i < len(padded); i += aes.BlockSize {
+		block.Encrypt(ciphertext[i:i+aes.BlockSize], padded[i:i+aes.BlockSize])
+	}
+
+	return base64.StdEncoding.EncodeToString(ciphertext), nil
+}
+
+// AESECBDecrypt AES-ECB模式解密，输入base64编码
+func AESECBDecrypt(encryptedData string, key []byte) ([]byte, error) {
+	ciphertext, err := base64.StdEncoding.DecodeString(encryptedData)
+	if err != nil {
+		return nil, fmt.Errorf("base64解码失败: %v", err)
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, fmt.Errorf("创建AES cipher失败: %v", err)
+	}
+
+	if len(ciphertext)%aes.BlockSize != 0 {
+		return nil, fmt.Errorf("密文长度不是块大小的整数倍")
+	}
+
+	plaintext := make([]byte, len(ciphertext))
+	for i := 0; i < len(ciphertext); i += aes.BlockSize {
+		block.Decrypt(plaintext[i:i+aes.BlockSize], ciphertext[i:i+aes.BlockSize])
+	}
+
+	plaintext, err = pkcs7UnPadding(plaintext)
+	if err != nil {
+		return nil, fmt.Errorf("去除填充失败: %v", err)
+	}
+
+	return plaintext, nil
+}
+
+// ============================================================
+// SM4-CBC 加密/解密（纯Go实现，无外部依赖）
+// ============================================================
+
+// SM4CBCEncrypt SM4-CBC模式加密，返回base64编码（IV前置）
+func SM4CBCEncrypt(plaintext []byte, key []byte) (string, error) {
+	if len(key) != 16 {
+		return "", fmt.Errorf("SM4密钥长度必须为16字节")
+	}
+
+	block, err := newSM4Cipher(key)
+	if err != nil {
+		return "", fmt.Errorf("创建SM4 cipher失败: %v", err)
+	}
+
+	padded := pkcs7Padding(plaintext, block.BlockSize())
+
+	iv := make([]byte, block.BlockSize())
+	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+		return "", fmt.Errorf("生成IV失败: %v", err)
+	}
+
+	mode := newCBCEncrypter(block, iv)
+	ciphertext := make([]byte, len(padded))
+	mode.CryptBlocks(ciphertext, padded)
+
+	result := append(iv, ciphertext...)
+	return base64.StdEncoding.EncodeToString(result), nil
+}
+
+// SM4CBCDecrypt SM4-CBC模式解密，输入base64编码
+func SM4CBCDecrypt(encryptedData string, key []byte) ([]byte, error) {
+	if len(key) != 16 {
+		return nil, fmt.Errorf("SM4密钥长度必须为16字节")
+	}
+
+	data, err := base64.StdEncoding.DecodeString(encryptedData)
+	if err != nil {
+		return nil, fmt.Errorf("base64解码失败: %v", err)
+	}
+
+	block, err := newSM4Cipher(key)
+	if err != nil {
+		return nil, fmt.Errorf("创建SM4 cipher失败: %v", err)
+	}
+
+	blockSize := block.BlockSize()
+	if len(data) < blockSize {
+		return nil, fmt.Errorf("数据长度不足")
+	}
+	iv := data[:blockSize]
+	ciphertext := data[blockSize:]
+
+	mode := newCBCDecrypter(block, iv)
+	plaintext := make([]byte, len(ciphertext))
+	mode.CryptBlocks(plaintext, ciphertext)
+
+	plaintext, err = pkcs7UnPadding(plaintext)
+	if err != nil {
+		return nil, fmt.Errorf("去除填充失败: %v", err)
+	}
+
+	return plaintext, nil
+}
+
+// ============================================================
+// SM4 纯Go实现
+// ============================================================
+
+type sm4Cipher struct {
+	sk [32]uint32
+}
+
+func newSM4Cipher(key []byte) (*sm4Cipher, error) {
+	if len(key) != 16 {
+		return nil, fmt.Errorf("SM4密钥长度必须为16字节")
+	}
+	c := &sm4Cipher{}
+	c.sm4KeyInit(key)
+	return c, nil
+}
+
+func (c *sm4Cipher) BlockSize() int { return 16 }
+
+func (c *sm4Cipher) Encrypt(dst, src []byte) {
+	c.sm4OneRound(dst, src, c.sk)
+}
+
+func (c *sm4Cipher) Decrypt(dst, src []byte) {
+	var rk [32]uint32
+	for i := 0; i < 32; i++ {
+		rk[i] = c.sk[31-i]
+	}
+	c.sm4OneRound(dst, src, rk)
+}
+
+type sm4CBCEncrypter struct {
+	b  *sm4Cipher
+	iv []byte
+}
+
+func newCBCEncrypter(b *sm4Cipher, iv []byte) *sm4CBCEncrypter {
+	return &sm4CBCEncrypter{b: b, iv: append([]byte{}, iv...)}
+}
+
+func (c *sm4CBCEncrypter) CryptBlocks(dst, src []byte) {
+	blockSize := c.b.BlockSize()
+	iv := make([]byte, blockSize)
+	copy(iv, c.iv)
+	for i := 0; i < len(src); i += blockSize {
+		for j := 0; j < blockSize; j++ {
+			dst[i+j] = src[i+j] ^ iv[j]
+		}
+		c.b.Encrypt(dst[i:i+blockSize], dst[i:i+blockSize])
+		copy(iv, dst[i:i+blockSize])
+	}
+}
+
+type sm4CBCDecrypter struct {
+	b  *sm4Cipher
+	iv []byte
+}
+
+func newCBCDecrypter(b *sm4Cipher, iv []byte) *sm4CBCDecrypter {
+	return &sm4CBCDecrypter{b: b, iv: append([]byte{}, iv...)}
+}
+
+func (c *sm4CBCDecrypter) CryptBlocks(dst, src []byte) {
+	blockSize := c.b.BlockSize()
+	iv := make([]byte, blockSize)
+	copy(iv, c.iv)
+	for i := 0; i < len(src); i += blockSize {
+		c.b.Decrypt(dst[i:i+blockSize], src[i:i+blockSize])
+		for j := 0; j < blockSize; j++ {
+			dst[i+j] ^= iv[j]
+		}
+		copy(iv, src[i:i+blockSize])
+	}
+}
+
+var sm4Sbox = [256]byte{
+	0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
+	0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
+	0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
+	0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
+	0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
+	0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
+	0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
+	0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
+	0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
+	0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
+	0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
+	0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
+	0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
+	0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
+	0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
+	0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48,
+}
+
+var sm4FK = [4]uint32{0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc}
+
+var sm4CK = [32]uint32{
+	0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
+	0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
+	0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
+	0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
+	0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
+	0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
+	0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
+	0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279,
+}
+
+func (c *sm4Cipher) sm4KeyInit(key []byte) {
+	var mk [4]uint32
+	for i := 0; i < 4; i++ {
+		mk[i] = uint32(key[4*i])<<24 | uint32(key[4*i+1])<<16 | uint32(key[4*i+2])<<8 | uint32(key[4*i+3])
+	}
+
+	var k [36]uint32
+	for i := 0; i < 4; i++ {
+		k[i] = mk[i] ^ sm4FK[i]
+	}
+
+	for i := 0; i < 32; i++ {
+		k[i+4] = k[i] ^ sm4L1(k[i+1]^k[i+2]^k[i+3]^sm4CK[i])
+		c.sk[i] = k[i+4]
+	}
+}
+
+func (c *sm4Cipher) sm4OneRound(dst, src []byte, sk [32]uint32) {
+	var x [36]uint32
+	for i := 0; i < 4; i++ {
+		x[i] = uint32(src[4*i])<<24 | uint32(src[4*i+1])<<16 | uint32(src[4*i+2])<<8 | uint32(src[4*i+3])
+	}
+
+	for i := 0; i < 32; i++ {
+		x[i+4] = x[i] ^ sm4L2(x[i+1]^x[i+2]^x[i+3]^sk[i])
+	}
+
+	for i := 0; i < 4; i++ {
+		dst[4*i] = byte(x[35-i] >> 24)
+		dst[4*i+1] = byte(x[35-i] >> 16)
+		dst[4*i+2] = byte(x[35-i] >> 8)
+		dst[4*i+3] = byte(x[35-i])
+	}
+}
+
+func sm4L1(b uint32) uint32 {
+	return b ^ sm4Rotl(b, 2) ^ sm4Rotl(b, 10) ^ sm4Rotl(b, 18) ^ sm4Rotl(b, 24)
+}
+
+func sm4L2(b uint32) uint32 {
+	return b ^ sm4Rotl(b, 13) ^ sm4Rotl(b, 23)
+}
+
+func sm4Rotl(x uint32, n uint32) uint32 {
+	return (x << n) | (x >> (32 - n))
+}
+
+// ============================================================
+// RSA 签名与验签
+// ============================================================
+
+// SignWithRSA 使用RSA私钥对字符串进行签名，返回base64编码
+func SignWithRSA(signStr string, privateKeyPEM string) (string, error) {
+	block, _ := pem.Decode([]byte(privateKeyPEM))
+	if block == nil {
+		return "", fmt.Errorf("解析PEM私钥失败")
+	}
+
+	privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+	if err != nil {
+		privateKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
+		if err != nil {
+			return "", fmt.Errorf("解析私钥失败: %v", err)
+		}
+	}
+
+	rsaPrivateKey, ok := privateKey.(*rsa.PrivateKey)
+	if !ok {
+		return "", fmt.Errorf("不是RSA私钥")
+	}
+
+	h := sha256.New()
+	h.Write([]byte(signStr))
+	hashed := h.Sum(nil)
+
+	signature, err := rsa.SignPKCS1v15(rand.Reader, rsaPrivateKey, crypto.SHA256, hashed)
+	if err != nil {
+		return "", fmt.Errorf("签名失败: %v", err)
+	}
+
+	return base64.StdEncoding.EncodeToString(signature), nil
+}
+
+// VerifyWithRSA 使用RSA公钥验证签名
+func VerifyWithRSA(signStr string, sign string, publicKeyPEM string) error {
+	block, _ := pem.Decode([]byte(publicKeyPEM))
+	if block == nil {
+		return fmt.Errorf("解析PEM公钥失败")
+	}
+
+	publicKey, err := x509.ParsePKIXPublicKey(block.Bytes)
+	if err != nil {
+		publicKey, err = x509.ParsePKCS1PublicKey(block.Bytes)
+		if err != nil {
+			return fmt.Errorf("解析公钥失败: %v", err)
+		}
+	}
+
+	rsaPublicKey, ok := publicKey.(*rsa.PublicKey)
+	if !ok {
+		return fmt.Errorf("不是RSA公钥")
+	}
+
+	signBytes, err := base64.StdEncoding.DecodeString(sign)
+	if err != nil {
+		return fmt.Errorf("base64解码签名失败: %v", err)
+	}
+
+	h := sha256.New()
+	h.Write([]byte(signStr))
+	hashed := h.Sum(nil)
+
+	return rsa.VerifyPKCS1v15(rsaPublicKey, crypto.SHA256, hashed, signBytes)
+}
+
+// ============================================================
+// 业务参数加密/解密
+// ============================================================
+
+// EncryptBizParams 加密业务参数
+// 将业务参数去掉零值，按字母排序，转JSON，然后用指定算法加密
+func EncryptBizParams(params interface{}, key []byte, encryptType string) (string, error) {
+	// 将结构体转为map，去掉零值
+	m, err := structToMap(params)
+	if err != nil {
+		return "", fmt.Errorf("转换参数失败: %v", err)
+	}
+
+	// 按key排序
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	// 构建有序map
+	orderedMap := make(map[string]interface{})
+	for _, k := range keys {
+		orderedMap[k] = m[k]
+	}
+
+	// 转JSON
+	plaintext, err := json.Marshal(orderedMap)
+	if err != nil {
+		return "", fmt.Errorf("JSON序列化失败: %v", err)
+	}
+
+	// 加密
+	switch encryptType {
+	case "aes":
+		return AESECBEncrypt(plaintext, key)
+	case "sm4":
+		return SM4CBCEncrypt(plaintext, key)
+	default:
+		return "", fmt.Errorf("不支持的加密类型: %s", encryptType)
+	}
+}
+
+// DecryptBizParams 解密业务参数
+func DecryptBizParams(ciphertext string, key []byte, encryptType string) ([]byte, error) {
+	switch encryptType {
+	case "aes":
+		return AESECBDecrypt(ciphertext, key)
+	case "sm4":
+		return SM4CBCDecrypt(ciphertext, key)
+	default:
+		return nil, fmt.Errorf("不支持的加密类型: %s", encryptType)
+	}
+}
+
+// structToMap 将结构体转为map，去掉零值
+func structToMap(obj interface{}) (map[string]interface{}, error) {
+	result := make(map[string]interface{})
+
+	v := reflect.ValueOf(obj)
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+	if v.Kind() != reflect.Struct {
+		return nil, fmt.Errorf("不是结构体")
+	}
+
+	t := v.Type()
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+		value := v.Field(i)
+
+		// 获取json tag
+		jsonTag := field.Tag.Get("json")
+		if jsonTag == "" || jsonTag == "-" {
+			continue
+		}
+		name := strings.Split(jsonTag, ",")[0]
+
+		// 检查omitempty
+		opts := strings.Split(jsonTag, ",")
+		omitempty := false
+		for _, opt := range opts[1:] {
+			if opt == "omitempty" {
+				omitempty = true
+				break
+			}
+		}
+
+		// 获取实际值
+		var val interface{}
+		switch value.Kind() {
+		case reflect.String:
+			val = value.String()
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			val = value.Int()
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			val = value.Uint()
+		case reflect.Float32, reflect.Float64:
+			val = value.Float()
+		case reflect.Bool:
+			val = value.Bool()
+		case reflect.Slice, reflect.Map:
+			if value.IsNil() {
+				if omitempty {
+					continue
+				}
+				val = value.Interface()
+			} else {
+				val = value.Interface()
+			}
+		case reflect.Ptr, reflect.Interface:
+			if value.IsNil() {
+				if omitempty {
+					continue
+				}
+				val = nil
+			} else {
+				val = value.Elem().Interface()
+			}
+		default:
+			val = value.Interface()
+		}
+
+		// 检查零值
+		if omitempty && isZeroValue(val) {
+			continue
+		}
+
+		result[name] = val
+	}
+
+	return result, nil
+}
+
+// isZeroValue 判断值是否为零值
+func isZeroValue(v interface{}) bool {
+	if v == nil {
+		return true
+	}
+	rv := reflect.ValueOf(v)
+	switch rv.Kind() {
+	case reflect.String:
+		return rv.String() == ""
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return rv.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return rv.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return rv.Float() == 0
+	case reflect.Bool:
+		return !rv.Bool()
+	default:
+		return false
+	}
+}
\ No newline at end of file