88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package main
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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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"errors"
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"io"
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)
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func padToLength(s string, length int, padChar rune) string {
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if len(s) >= length {
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return s
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}
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// 计算需要填充的字符数
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padding := make([]rune, length-len(s))
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for i := range padding {
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padding[i] = padChar
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}
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// 将原字符串和填充字符组合起来
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return s + string(padding)
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}
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// 加密函数
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func encrypt(key []byte, text string) (string, error) {
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plaintext := []byte(text)
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// 创建一个新的cipher.Block
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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// 创建一个新的GCM模式的加密器
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gcm, 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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// 创建一个nonce（随机数）
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nonce := make([]byte, gcm.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
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ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
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// 返回Base64编码的加密字符串
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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 decrypt(key []byte, encryptedText string) (string, error) {
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// 解码Base64字符串
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ciphertext, err := base64.StdEncoding.DecodeString(encryptedText)
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if err != nil {
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return "", err
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}
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// 创建一个新的cipher.Block
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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// 创建一个新的GCM模式的解密器
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gcm, 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和实际加密数据
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nonceSize := gcm.NonceSize()
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if len(ciphertext) < nonceSize {
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return "", errors.New("ciphertext too short")
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}
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nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return "", err
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}
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return string(plaintext), nil
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}
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