70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
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package cryptfs
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import (
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"path/filepath"
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"io/ioutil"
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"fmt"
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"strings"
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)
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// readDirIV - read the "gocryptfs.diriv" file from "dir" (absolute path)
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func (be *CryptFS) readDirIV(dir string) (iv []byte, err error) {
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ivfile := filepath.Join(dir, DIRIV_FILENAME)
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iv, err = ioutil.ReadFile(ivfile)
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if err != nil {
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Warn.Printf("readDirIV: %v\n", err)
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return nil, err
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}
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if len(iv) != DIRIV_LEN {
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return nil, fmt.Errorf("readDirIV: Invalid length %d\n", len(iv))
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}
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return iv, nil
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}
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// EncryptPathDirIV - encrypt path using CBC with DirIV
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func (be *CryptFS) EncryptPathDirIV(plainPath string, rootDir string) (string, error) {
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if be.plaintextNames {
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return plainPath, nil
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}
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// Empty string means root directory
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if plainPath == "" {
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return plainPath, nil
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}
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var wd = rootDir
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var encryptedNames []string
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plainNames := strings.Split(plainPath, "/")
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for _, plainName := range plainNames {
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iv, err := be.readDirIV(wd)
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if err != nil {
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return "", err
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}
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encryptedName := be.encryptName(plainName, iv)
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encryptedNames = append(encryptedNames, encryptedName)
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wd = filepath.Join(wd, encryptedName)
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}
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return filepath.Join(encryptedNames...), nil
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}
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// DecryptPathDirIV - encrypt path using CBC with DirIV
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func (be *CryptFS) DecryptPathDirIV(encryptedPath string, rootDir string) (string, error) {
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if be.plaintextNames {
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return encryptedPath, nil
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}
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var wd = rootDir
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var plainNames []string
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encryptedNames := strings.Split(encryptedPath, "/")
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for _, encryptedName := range encryptedNames {
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iv, err := be.readDirIV(wd)
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if err != nil {
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return "", err
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}
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plainName, err := be.decryptName(encryptedName, iv)
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if err != nil {
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return "", err
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}
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plainNames = append(plainNames, plainName)
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wd = filepath.Join(wd, encryptedName)
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}
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return filepath.Join(plainNames...), nil
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}
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