Major refactoring: Split up "cryptfs" into several internal packages

"git status" for reference:

deleted:    cryptfs/cryptfs.go
deleted:    cryptfs/names_core.go
modified:   integration_tests/cli_test.go
modified:   integration_tests/helpers.go
renamed:    cryptfs/config_file.go -> internal/configfile/config_file.go
renamed:    cryptfs/config_test.go -> internal/configfile/config_test.go
renamed:    cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore
renamed:    cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf
renamed:    cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf
renamed:    cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf
renamed:    cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf
renamed:    cryptfs/kdf.go -> internal/configfile/kdf.go
renamed:    cryptfs/kdf_test.go -> internal/configfile/kdf_test.go
renamed:    cryptfs/cryptfs_content.go -> internal/contentenc/content.go
new file:   internal/contentenc/content_api.go
renamed:    cryptfs/content_test.go -> internal/contentenc/content_test.go
renamed:    cryptfs/file_header.go -> internal/contentenc/file_header.go
renamed:    cryptfs/intrablock.go -> internal/contentenc/intrablock.go
renamed:    cryptfs/address_translation.go -> internal/contentenc/offsets.go
new file:   internal/cryptocore/crypto_api.go
renamed:    cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go
renamed:    cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go
renamed:    cryptfs/nonce.go -> internal/cryptocore/nonce.go
renamed:    cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go
renamed:    cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash
renamed:    cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go
new file:   internal/nametransform/name_api.go
new file:   internal/nametransform/names_core.go
renamed:    cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go
renamed:    cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go
renamed:    cryptfs/names_test.go -> internal/nametransform/names_test.go
new file:   internal/nametransform/pad16.go
renamed:    cryptfs/log.go -> internal/toggledlog/log.go
renamed:    cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go
renamed:    cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go
modified:   main.go
modified:   masterkey.go
modified:   pathfs_frontend/file.go
modified:   pathfs_frontend/file_holes.go
modified:   pathfs_frontend/fs.go
modified:   pathfs_frontend/fs_dir.go
modified:   pathfs_frontend/names.go
modified:   test.bash

1 files changed, 0 insertions, 140 deletions

diff --git a/cryptfs/names_diriv.go b/cryptfs/names_diriv.go
deleted file mode 100644
index 276316c..0000000
--- a/cryptfs/names_diriv.go
+++ /dev/null
@@ -1,140 +0,0 @@
-package cryptfs
-
-import (
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-)
-
-// A simple one-entry DirIV cache
-type dirIVCache struct {
-	// Invalidated?
-	cleared bool
-	// The DirIV
-	iv []byte
-	// Directory the DirIV belongs to
-	dir string
-	// Ecrypted version of "dir"
-	translatedDir string
-	// Synchronisation
-	lock sync.RWMutex
-}
-
-// lookup - fetch entry for "dir" from the cache
-func (c *dirIVCache) lookup(dir string) (bool, []byte, string) {
-	c.lock.RLock()
-	defer c.lock.RUnlock()
-	if !c.cleared && c.dir == dir {
-		return true, c.iv, c.translatedDir
-	}
-	return false, nil, ""
-}
-
-// store - write entry for "dir" into the caches
-func (c *dirIVCache) store(dir string, iv []byte, translatedDir string) {
-	c.lock.Lock()
-	defer c.lock.Unlock()
-	c.cleared = false
-	c.iv = iv
-	c.dir = dir
-	c.translatedDir = translatedDir
-}
-
-func (c *dirIVCache) Clear() {
-	c.lock.Lock()
-	defer c.lock.Unlock()
-	c.cleared = true
-}
-
-// readDirIV - read the "gocryptfs.diriv" file from "dir" (absolute ciphertext path)
-func (be *CryptFS) ReadDirIV(dir string) (iv []byte, readErr error) {
-	ivfile := filepath.Join(dir, DIRIV_FILENAME)
-	Debug.Printf("ReadDirIV: reading %s\n", ivfile)
-	iv, readErr = ioutil.ReadFile(ivfile)
-	if readErr != nil {
-		// The directory may have been concurrently deleted or moved. Failure to
-		// read the diriv is not an error in that case.
-		_, statErr := os.Stat(dir)
-		if os.IsNotExist(statErr) {
-			Debug.Printf("ReadDirIV: Dir %s was deleted under our feet", dir)
-		} else {
-			// This should not happen
-			Warn.Printf("ReadDirIV: Dir exists but diriv does not: %v\n", readErr)
-		}
-		return nil, readErr
-	}
-	if len(iv) != DIRIV_LEN {
-		return nil, fmt.Errorf("ReadDirIV: Invalid length %d\n", len(iv))
-	}
-	return iv, nil
-}
-
-// WriteDirIV - create diriv file inside "dir" (absolute ciphertext path)
-// This function is exported because it is used from pathfs_frontend, main,
-// and also the automated tests.
-func WriteDirIV(dir string) error {
-	iv := RandBytes(DIRIV_LEN)
-	file := filepath.Join(dir, DIRIV_FILENAME)
-	// 0444 permissions: the file is not secret but should not be written to
-	return ioutil.WriteFile(file, iv, 0444)
-}
-
-// EncryptPathDirIV - encrypt path using EME with DirIV
-func (be *CryptFS) EncryptPathDirIV(plainPath string, rootDir string, eme bool) (cipherPath string, err error) {
-	// Empty string means root directory
-	if plainPath == "" {
-		return plainPath, nil
-	}
-	// Check if the DirIV is cached
-	parentDir := filepath.Dir(plainPath)
-	found, iv, cParentDir := be.DirIVCache.lookup(parentDir)
-	if found {
-		//fmt.Print("h")
-		baseName := filepath.Base(plainPath)
-		cBaseName := be.encryptName(baseName, iv, eme)
-		cipherPath = cParentDir + "/" + cBaseName
-		return cipherPath, nil
-	}
-	// Walk the directory tree
-	var wd = rootDir
-	var encryptedNames []string
-	plainNames := strings.Split(plainPath, "/")
-	for _, plainName := range plainNames {
-		iv, err = be.ReadDirIV(wd)
-		if err != nil {
-			return "", err
-		}
-		encryptedName := be.encryptName(plainName, iv, eme)
-		encryptedNames = append(encryptedNames, encryptedName)
-		wd = filepath.Join(wd, encryptedName)
-	}
-	// Cache the final DirIV
-	cipherPath = strings.Join(encryptedNames, "/")
-	cParentDir = filepath.Dir(cipherPath)
-	be.DirIVCache.store(parentDir, iv, cParentDir)
-	return cipherPath, nil
-}
-
-// DecryptPathDirIV - decrypt path using EME with DirIV
-func (be *CryptFS) DecryptPathDirIV(encryptedPath string, rootDir string, eme bool) (string, error) {
-	var wd = rootDir
-	var plainNames []string
-	encryptedNames := strings.Split(encryptedPath, "/")
-	Debug.Printf("DecryptPathDirIV: decrypting %v\n", encryptedNames)
-	for _, encryptedName := range encryptedNames {
-		iv, err := be.ReadDirIV(wd)
-		if err != nil {
-			return "", err
-		}
-		plainName, err := be.decryptName(encryptedName, iv, eme)
-		if err != nil {
-			return "", err
-		}
-		plainNames = append(plainNames, plainName)
-		wd = filepath.Join(wd, encryptedName)
-	}
-	return filepath.Join(plainNames...), nil
-}