76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
// 提供自定义的随机密钥自解密加密算法支持，算法代号：Spiral。
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package spiral
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import (
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"errors"
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"fmt"
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"strings"
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"archgrid.xyz/ag/toolsbox/encryption"
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"archgrid.xyz/ag/toolsbox/encryption/aes"
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"archgrid.xyz/ag/toolsbox/hash/sha512"
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verifyCode "archgrid.xyz/ag/toolsbox/random/verify_code"
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"archgrid.xyz/ag/toolsbox/serialize/base64"
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)
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type Strength int
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const (
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Compatible Strength = iota
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Enhanced
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)
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// 根据给定的密钥字符串生成加解密使用的密钥。
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func generateKey(key string) []byte {
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keyBytes := sha512.Sha512([]byte(key))
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return keyBytes[4:36]
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}
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// 对给定的数据进行加密。
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func Encrypt(data string, strength ...Strength) (string, error) {
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var ivGen aes.IVGenerator
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if append(strength, Enhanced)[0] == Compatible {
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ivGen = aes.PrefixIVGenerator
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} else {
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ivGen = aes.XorIVGenerator
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}
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key := verifyCode.RandStr(20)
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keyBytes := generateKey(key)
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cipherData, err := aes.Encrypt([]byte(data), keyBytes, encryption.PKCS7Padding, ivGen)
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if err != nil {
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return "", fmt.Errorf("加密计算失败，%w", err)
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}
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var result strings.Builder
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result.WriteString("[")
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result.WriteString(key)
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result.WriteString(base64.ToBase64(cipherData))
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return result.String(), nil
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}
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// 对给定的数据进行解密。
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func Decrypt(data string, strength ...Strength) (string, error) {
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var ivGen aes.IVGenerator
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if append(strength, Enhanced)[0] == Compatible {
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ivGen = aes.PrefixIVGenerator
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} else {
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ivGen = aes.XorIVGenerator
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}
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if message, found := strings.CutPrefix(data, "["); found {
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if len(message) > 20 {
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keySeed := message[:20]
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key := generateKey(keySeed)
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cipherData, err := base64.FromBase64(message[20:])
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if err != nil {
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return "", fmt.Errorf("密文损坏无法解析，%w", err)
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}
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plainText, err := aes.Decrypt(cipherData, key, encryption.PKCS7Padding, ivGen)
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if err != nil {
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return "", fmt.Errorf("密文解密计算失败，%w", err)
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}
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return string(plainText), nil
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}
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return "", errors.New("密文缺损，无法完成解密。")
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}
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return data, nil
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}
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