37 lines
1020 B
Go
37 lines
1020 B
Go
package captcha
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import (
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"encoding/base64"
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"fmt"
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"time"
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"ycc-server/pkg/lzkit/crypto"
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)
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// GenerateEncryptedSceneID 生成加密的场景ID
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// 格式: sceneId×tamp&expireTime -> AES-256-CBC + PKCS7 -> Base64(IV + ciphertext)
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func GenerateEncryptedSceneID(sceneId, ekey string, expireSeconds int) (string, error) {
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// 参数校验
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if expireSeconds <= 0 || expireSeconds > 86400 {
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expireSeconds = 3600 // 默认1小时
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}
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// 构建明文: sceneId×tamp&expireTime
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ts := time.Now().Unix()
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plaintext := fmt.Sprintf("%s&%d&%d", sceneId, ts, expireSeconds)
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// 解码 ekey（Base64 -> 32字节密钥）
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keyBytes, err := base64.StdEncoding.DecodeString(ekey)
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if err != nil {
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return "", fmt.Errorf("decode ekey error: %w", err)
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}
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// 验证密钥长度（AES-256 需要 32 字节）
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if len(keyBytes) != 32 {
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return "", fmt.Errorf("invalid ekey length, need 32 bytes after base64 decode, got %d", len(keyBytes))
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}
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// 使用 AES 加密
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return crypto.AesEncrypt([]byte(plaintext), keyBytes)
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}
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