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, 83 deletions

diff --git a/cryptfs/cryptfs.go b/cryptfs/cryptfs.go
deleted file mode 100644
index 3a40e29..0000000
--- a/cryptfs/cryptfs.go
+++ /dev/null
@@ -1,83 +0,0 @@
-package cryptfs
-
-// CryptFS is the crypto backend of GoCryptFS
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"fmt"
-)
-
-const (
-	PROGRAM_NAME = "gocryptfs"
-
-	DEFAULT_PLAINBS = 4096
-	KEY_LEN         = 32 // AES-256
-	AUTH_TAG_LEN    = 16
-	DIRIV_LEN       = 16 // identical to AES block size
-	DIRIV_FILENAME  = "gocryptfs.diriv"
-)
-
-type CryptFS struct {
-	blockCipher cipher.Block
-	gcm         cipher.AEAD
-	gcmIVLen    int
-	gcmIVGen    nonceGenerator
-	plainBS     uint64
-	cipherBS    uint64
-	// Stores an all-zero block of size cipherBS
-	allZeroBlock []byte
-	// DirIV cache for filename encryption
-	DirIVCache dirIVCache
-}
-
-func NewCryptFS(key []byte, useOpenssl bool, plaintextNames bool, GCMIV128 bool) *CryptFS {
-
-	if len(key) != KEY_LEN {
-		panic(fmt.Sprintf("Unsupported key length %d", len(key)))
-	}
-
-	b, err := aes.NewCipher(key)
-	if err != nil {
-		panic(err)
-	}
-
-	// We want the IV size in bytes
-	gcmIV := 96 / 8
-	if GCMIV128 {
-		gcmIV = 128 / 8
-	}
-
-	var gcm cipher.AEAD
-	if useOpenssl {
-		gcm = opensslGCM{key}
-	} else {
-		gcm, err = goGCMWrapper(b, gcmIV)
-		if err != nil {
-			panic(err)
-		}
-	}
-
-	plainBS := DEFAULT_PLAINBS
-	cipherBS := plainBS + gcmIV + AUTH_TAG_LEN
-
-	return &CryptFS{
-		blockCipher:  b,
-		gcm:          gcm,
-		gcmIVLen:     gcmIV,
-		gcmIVGen:     nonceGenerator{nonceLen: gcmIV},
-		plainBS:      uint64(plainBS),
-		cipherBS:     uint64(cipherBS),
-		allZeroBlock: make([]byte, cipherBS),
-	}
-}
-
-// Get plaintext block size
-func (be *CryptFS) PlainBS() uint64 {
-	return be.plainBS
-}
-
-// Per-block storage overhead
-func (be *CryptFS) BlockOverhead() uint64 {
-	return be.cipherBS - be.plainBS
-}