82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
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package private
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import (
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"context"
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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"strings"
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"time"
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pb "git.apinb.com/bsm-apps/cloud/pb"
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"git.apinb.com/bsm-sdk/core/errcode"
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"git.apinb.com/bsm-sdk/core/service"
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)
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// 解密数据
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func DecryptData(ctx context.Context, in *pb.DataRequest) (reply *pb.StatusReply, err error) {
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// parse authorization meta.
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_, err = service.ParseMetaCtx(ctx, nil)
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if err != nil {
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return nil, err
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}
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// validate request
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if strings.TrimSpace(in.Data) == "" {
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return nil, errcode.ErrInvalidArgument
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}
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if strings.TrimSpace(in.Key) == "" {
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return nil, errcode.ErrInvalidArgument
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}
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// logic code
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// 解码base64数据
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ciphertext, err := base64.StdEncoding.DecodeString(in.Data)
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if err != nil {
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return nil, errcode.ErrInvalidArgument
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}
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key := []byte(in.Key)
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if len(key) != 32 {
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// 如果密钥长度不是32字节，进行填充或截断
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if len(key) < 32 {
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for len(key) < 32 {
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key = append(key, 0)
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}
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} else {
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key = key[:32]
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}
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, errcode.ErrInternal
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}
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// 使用GCM模式进行解密
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, errcode.ErrInternal
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}
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// 检查数据长度
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if len(ciphertext) < gcm.NonceSize() {
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return nil, errcode.ErrInvalidArgument
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}
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// 分离nonce和密文
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nonce := ciphertext[:gcm.NonceSize()]
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ciphertext = ciphertext[gcm.NonceSize():]
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// 解密数据
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, errcode.ErrInvalidArgument
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}
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return &pb.StatusReply{
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Details: string(plaintext),
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Timeseq: time.Now().UnixMilli(),
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}, nil
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}
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