79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
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package utils
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"io"
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)
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// 加密函数
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func EncryptCode(plainText string, key string) (string, error) {
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// 创建 AES 块加密器
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 将原始文本转为字节数组
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plainTextBytes := []byte(plainText)
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// 创建加密用的 GCM (Galois/Counter Mode)
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aesGCM, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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// 创建随机的 nonce，长度必须为 GCM 的 nonceSize
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nonce := make([]byte, aesGCM.NonceSize())
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if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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// 加密数据并附带 nonce
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cipherText := aesGCM.Seal(nonce, nonce, plainTextBytes, nil)
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// 将加密后的内容用 base64 编码
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return base64.StdEncoding.EncodeToString(cipherText), nil
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}
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// 解密函数
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func DecryptCode(cipherText string, key string) (string, error) {
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// 解码 base64 编码的密文
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cipherTextBytes, err := base64.StdEncoding.DecodeString(cipherText)
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if err != nil {
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return "", err
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}
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// 创建 AES 块加密器
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 创建加密用的 GCM
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aesGCM, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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// 分离 nonce 和加密数据
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nonceSize := aesGCM.NonceSize()
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if len(cipherTextBytes) < nonceSize {
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return "", fmt.Errorf("cipherText too short")
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}
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nonce, cipherTextBytes := cipherTextBytes[:nonceSize], cipherTextBytes[nonceSize:]
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// 解密数据
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plainTextBytes, err := aesGCM.Open(nil, nonce, cipherTextBytes, nil)
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if err != nil {
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return "", err
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}
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// 返回解密后的明文
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return string(plainTextBytes), nil
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}
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