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, 56 deletions

diff --git a/cryptfs/file_header.go b/cryptfs/file_header.go
deleted file mode 100644
index fe4ac56..0000000
--- a/cryptfs/file_header.go
+++ /dev/null
@@ -1,56 +0,0 @@
-package cryptfs
-
-// Per-file header
-//
-// Format: [ "Version" uint16 big endian ] [ "Id" 16 random bytes ]
-
-import (
-	"encoding/binary"
-	"fmt"
-)
-
-const (
-	HEADER_CURRENT_VERSION = 2                                  // Current on-disk-format version
-	HEADER_VERSION_LEN     = 2                                  // uint16
-	HEADER_ID_LEN          = 16                                 // 128 bit random file id
-	HEADER_LEN             = HEADER_VERSION_LEN + HEADER_ID_LEN // Total header length
-)
-
-type FileHeader struct {
-	Version uint16
-	Id      []byte
-}
-
-// Pack - serialize fileHeader object
-func (h *FileHeader) Pack() []byte {
-	if len(h.Id) != HEADER_ID_LEN || h.Version != HEADER_CURRENT_VERSION {
-		panic("FileHeader object not properly initialized")
-	}
-	buf := make([]byte, HEADER_LEN)
-	binary.BigEndian.PutUint16(buf[0:HEADER_VERSION_LEN], h.Version)
-	copy(buf[HEADER_VERSION_LEN:], h.Id)
-	return buf
-
-}
-
-// ParseHeader - parse "buf" into fileHeader object
-func ParseHeader(buf []byte) (*FileHeader, error) {
-	if len(buf) != HEADER_LEN {
-		return nil, fmt.Errorf("ParseHeader: invalid length: got %d, want %d", len(buf), HEADER_LEN)
-	}
-	var h FileHeader
-	h.Version = binary.BigEndian.Uint16(buf[0:HEADER_VERSION_LEN])
-	if h.Version != HEADER_CURRENT_VERSION {
-		return nil, fmt.Errorf("ParseHeader: invalid version: got %d, want %d", h.Version, HEADER_CURRENT_VERSION)
-	}
-	h.Id = buf[HEADER_VERSION_LEN:]
-	return &h, nil
-}
-
-// RandomHeader - create new fileHeader object with random Id
-func RandomHeader() *FileHeader {
-	var h FileHeader
-	h.Version = HEADER_CURRENT_VERSION
-	h.Id = RandBytes(HEADER_ID_LEN)
-	return &h
-}