添加文件: ymt_v3_2/crypto.go

This commit is contained in:
renzhiyuan 2026-07-21 15:18:56 +08:00
parent f03c51655e
commit db6a614a88
1 changed files with 246 additions and 0 deletions

246
ymt_v3_2/crypto.go Normal file
View File

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package ymt_v3_2
import (
"bytes"
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"sort"
"strings"
)
func parsePrivateKey(pemData string) (*rsa.PrivateKey, error) {
block, _ := pem.Decode([]byte(pemData))
if block == nil {
return nil, errors.New("failed to decode PEM block")
}
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
key, err = x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parse private key: %w", err)
}
}
rsaKey, ok := key.(*rsa.PrivateKey)
if !ok {
return nil, errors.New("not an RSA private key")
}
return rsaKey, nil
}
func parsePublicKey(pemData string) (*rsa.PublicKey, error) {
block, _ := pem.Decode([]byte(pemData))
if block == nil {
return nil, errors.New("failed to decode PEM block")
}
key, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parse public key: %w", err)
}
rsaKey, ok := key.(*rsa.PublicKey)
if !ok {
return nil, errors.New("not an RSA public key")
}
return rsaKey, nil
}
func marshalSortedNoZero(v interface{}) ([]byte, error) {
data, err := json.Marshal(v)
if err != nil {
return nil, err
}
var raw map[string]interface{}
if err := json.Unmarshal(data, &raw); err != nil {
return nil, err
}
filtered := removeZeroValues(raw)
keys := make([]string, 0, len(filtered))
for k := range filtered {
keys = append(keys, k)
}
sort.Strings(keys)
var buf bytes.Buffer
buf.WriteByte('{')
for i, k := range keys {
if i > 0 {
buf.WriteByte(',')
}
keyBytes, _ := json.Marshal(k)
buf.Write(keyBytes)
buf.WriteByte(':')
valBytes, err := json.Marshal(filtered[k])
if err != nil {
return nil, err
}
buf.Write(valBytes)
}
buf.WriteByte('}')
return buf.Bytes(), nil
}
func removeZeroValues(m map[string]interface{}) map[string]interface{} {
res := make(map[string]interface{})
for k, v := range m {
if isZeroValue(v) {
continue
}
if sub, ok := v.(map[string]interface{}); ok {
subFiltered := removeZeroValues(sub)
if len(subFiltered) > 0 {
res[k] = subFiltered
}
} else {
res[k] = v
}
}
return res
}
func isZeroValue(v interface{}) bool {
if v == nil {
return true
}
switch val := v.(type) {
case string:
return val == ""
case float64:
return val == 0
case bool:
return !val
case []interface{}:
return len(val) == 0
case map[string]interface{}:
return len(val) == 0
default:
return false
}
}
func aesEncryptECB(plaintext, key []byte) (string, error) {
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
blockSize := block.BlockSize()
plaintext = pkcs7Padding(plaintext, blockSize)
ciphertext := make([]byte, len(plaintext))
for i := 0; i < len(plaintext); i += blockSize {
block.Encrypt(ciphertext[i:i+blockSize], plaintext[i:i+blockSize])
}
return base64.StdEncoding.EncodeToString(ciphertext), nil
}
func aesDecryptECB(ciphertext string, key []byte) ([]byte, error) {
data, err := base64.StdEncoding.DecodeString(ciphertext)
if err != nil {
return nil, err
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
if len(data)%blockSize != 0 {
return nil, errors.New("ciphertext is not a multiple of the block size")
}
plaintext := make([]byte, len(data))
for i := 0; i < len(data); i += blockSize {
block.Decrypt(plaintext[i:i+blockSize], data[i:i+blockSize])
}
plaintext, err = pkcs7Unpadding(plaintext, blockSize)
if err != nil {
return nil, err
}
return plaintext, nil
}
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, blockSize int) ([]byte, error) {
length := len(data)
if length == 0 {
return nil, errors.New("empty data")
}
padding := int(data[length-1])
if padding > blockSize || padding == 0 {
return nil, errors.New("invalid padding")
}
for i := length - padding; i < length; i++ {
if data[i] != byte(padding) {
return nil, errors.New("invalid padding")
}
}
return data[:length-padding], nil
}
func rsaSign(data []byte, privateKey *rsa.PrivateKey) (string, error) {
hashed := sha256.Sum256(data)
signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, hashed[:])
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(signature), nil
}
func rsaVerify(data []byte, sign string, publicKey *rsa.PublicKey) error {
signBytes, err := base64.StdEncoding.DecodeString(sign)
if err != nil {
return err
}
hashed := sha256.Sum256(data)
return rsa.VerifyPKCS1v15(publicKey, crypto.SHA256, hashed[:], signBytes)
}
func (c *Client) VerifyCallbackSign(appID, timestamp, sign string, callbackData map[string]interface{}) error {
filtered := removeZeroValues(callbackData)
keys := make([]string, 0, len(filtered))
for k := range filtered {
keys = append(keys, k)
}
sort.Strings(keys)
var buf bytes.Buffer
buf.WriteByte('{')
for i, k := range keys {
if i > 0 {
buf.WriteByte(',')
}
keyBytes, _ := json.Marshal(k)
buf.Write(keyBytes)
buf.WriteByte(':')
valBytes, err := json.Marshal(filtered[k])
if err != nil {
return err
}
buf.Write(valBytes)
}
buf.WriteByte('}')
plaintext := buf.Bytes()
ciphertext, err := aesEncryptECB(plaintext, c.aesKey)
if err != nil {
return err
}
signStr := appID + timestamp + ciphertext
return rsaVerify([]byte(signStr), sign, c.publicKey)
}
var _ = cipher.NewCBCEncrypter
var _ = strings.ReplaceAll