feat(all): v1.0

pkg/lzkit/crypto/crypto.go

@@ -0,0 +1,105 @@
+package crypto
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/md5"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"io"
+)
+
+// PKCS7填充
+func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+
+// 去除PKCS7填充
+func PKCS7UnPadding(origData []byte) ([]byte, error) {
+	length := len(origData)
+	if length == 0 {
+		return nil, errors.New("input data error")
+	}
+	unpadding := int(origData[length-1])
+	if unpadding > length {
+		return nil, errors.New("unpadding size is invalid")
+	}
+
+	// 检查填充字节是否一致
+	for i := 0; i < unpadding; i++ {
+		if origData[length-1-i] != byte(unpadding) {
+			return nil, errors.New("invalid padding")
+		}
+	}
+
+	return origData[:(length - unpadding)], nil
+}
+
+// AES CBC模式加密，Base64传入传出
+func AesEncrypt(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, blockSize+len(plainText))
+	iv := cipherText[:blockSize] // 使用前blockSize字节作为IV
+	_, err = io.ReadFull(rand.Reader, iv)
+	if err != nil {
+		return "", err
+	}
+
+	mode := cipher.NewCBCEncrypter(block, iv)
+	mode.CryptBlocks(cipherText[blockSize:], plainText)
+
+	return base64.StdEncoding.EncodeToString(cipherText), nil
+}
+
+// AES CBC模式解密，Base64传入传出
+func AesDecrypt(cipherTextBase64 string, key []byte) ([]byte, error) {
+	cipherText, err := base64.StdEncoding.DecodeString(cipherTextBase64)
+	if err != nil {
+		return nil, err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	blockSize := block.BlockSize()
+	if len(cipherText) < blockSize {
+		return nil, errors.New("ciphertext too short")
+	}
+
+	iv := cipherText[:blockSize]
+	cipherText = cipherText[blockSize:]
+
+	if len(cipherText)%blockSize != 0 {
+		return nil, errors.New("ciphertext is not a multiple of the block size")
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(cipherText, cipherText)
+
+	plainText, err := PKCS7UnPadding(cipherText)
+	if err != nil {
+		return nil, err
+	}
+
+	return plainText, nil
+}
+
+// Md5Encrypt 用于对传入的message进行MD5加密
+func Md5Encrypt(message string) string {
+	hash := md5.New()
+	hash.Write([]byte(message))              // 将字符串转换为字节切片并写入
+	return hex.EncodeToString(hash.Sum(nil)) // 将哈希值转换为16进制字符串并返回
+}