first commit

pkg/lzkit/crypto/tianyuan_crypto.go

@@ -0,0 +1,102 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"io"
+)
+
+// TianyuanEncrypt 天远数据AES-128-CBC加密，返回Base64编码的字符串
+// 与Node.js中的aesEncrypt函数对应
+func TianyuanEncrypt(plainText []byte, keyHex string) (string, error) {
+	// 将16进制密钥转换为字节
+	keyBuffer, err := hex.DecodeString(keyHex)
+	if err != nil {
+		return "", err
+	}
+
+	// 创建AES密码器
+	block, err := aes.NewCipher(keyBuffer)
+	if err != nil {
+		return "", err
+	}
+
+	blockSize := block.BlockSize() // AES块大小为16字节
+
+	// 生成随机IV
+	iv := make([]byte, blockSize)
+	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+		return "", err
+	}
+
+	// 创建CBC加密器
+	mode := cipher.NewCBCEncrypter(block, iv)
+
+	// PKCS7填充
+	paddedText := PKCS7Padding(plainText, blockSize)
+
+	// 加密
+	encrypted := make([]byte, len(paddedText))
+	mode.CryptBlocks(encrypted, paddedText)
+
+	// 将IV和加密数据连接在一起，然后Base64编码
+	result := append(iv, encrypted...)
+	return base64.StdEncoding.EncodeToString(result), nil
+}
+
+// TianyuanDecrypt 天远数据AES-128-CBC解密，返回解密后的字节数组
+// 与Node.js中的aesDecrypt函数对应
+func TianyuanDecrypt(encryptedText, keyHex string) ([]byte, error) {
+	// 将16进制密钥转换为字节
+	keyBuffer, err := hex.DecodeString(keyHex)
+	if err != nil {
+		return nil, err
+	}
+
+	// Base64解码
+	encryptedBuffer, err := base64.StdEncoding.DecodeString(encryptedText)
+	if err != nil {
+		return nil, err
+	}
+
+	// 创建AES密码器
+	block, err := aes.NewCipher(keyBuffer)
+	if err != nil {
+		return nil, err
+	}
+
+	blockSize := block.BlockSize()
+
+	// 检查数据长度
+	if len(encryptedBuffer) < blockSize {
+		return nil, errors.New("encrypted text too short")
+	}
+
+	// 提取IV和加密数据
+	iv := encryptedBuffer[:blockSize]
+	encryptedData := encryptedBuffer[blockSize:]
+
+	// 检查加密数据长度是否为块大小的倍数
+	if len(encryptedData)%blockSize != 0 {
+		return nil, errors.New("encrypted data is not a multiple of the block size")
+	}
+
+	// 创建CBC解密器
+	mode := cipher.NewCBCDecrypter(block, iv)
+
+	// 解密
+	decrypted := make([]byte, len(encryptedData))
+	mode.CryptBlocks(decrypted, encryptedData)
+
+	// 去除PKCS7填充
+	result, err := PKCS7UnPadding(decrypted)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}