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Hardcore Sushi 3 years ago
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.DS_Store
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ehthumbs.db
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/app/release
.gradle
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*.apk
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*.a
*.so

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LICENSE.txt
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
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README.md
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# DroidFS
DroidFS is an implementation of encrypted overlay filesystems for Android.
It allows you to store files and folder in encrypted virtual volumes so that you can share them, store them in the cloud or simply access them more securely.
It currently only supports [gocryptfs](https://github.com/rfjakob/gocryptfs) but support for [CryFS](https://github.com/cryfs/cryfs) is expected to be added soon.<br>
DroidFS require Android API level 21+ (Android Lollipop).
# Disclamer
DroidFS is provided "as is", without any warranty of any kind.
It shouldn't be considered an absolute safe way to store files.
DroidFS cannot protect you from screen recording apps, keyloggers, apk backdooring, compromised root accesses, memory dumps etc.
Do not use this app with volumes containing sensitive data unless you know exactly what you are doing.
# Unsafe features
DroidFS allows you to enable/disable unsafe features to fit your needs between security and comfort.
It is strongly recommended to read the documentation of a feature before enabling it.
#### Allow screenshots:
Disable the secure flag of DroidFS activities. This will allow you to take screenshots from the app, but will also allow other apps to record the screen while using DroidFS.
Note: apps with root access don't care about this flag: they can take screenshots or record the screen of any app without any permissions.
#### Allow opening files with other applications:
Decrypt and open file using external apps. This require writing the plain file to disk (DroidFS internal storage).
#### Allow exporting files:
Decrypt and write file to disk (external storage). Any app with storage permissions can access exported files.
#### Allow sharing files via the android share menu:
Decrypt and share file with other apps. This require writing the plain file to disk (DroidFS internal storage).
#### Allow saving password hash using fingerprint:
Generate an AES-256 GCM key in the Android Keystore (protected by fingerprint authentication), then use it to encrypt the volume password hash and store it to the DroidFS internal storage. This require Android v6.0+
# Download
You can download the latest version [here](https://github.com/hardcore-sushi/DroidFS/releases).
# Build
Most of the original gocryptfs code was used as is (written in Go) and compiled to native code. That's why you need [Go](https://golang.org) and the [Android Native Development Kit (NDK)](https://developer.android.com/ndk/) to build DroidFS from source.
#### Install Requirements
- [Android Studio](https://developer.android.com/studio/)
- [Android NDK and CMake](https://developer.android.com/studio/projects/install-ndk)
- [Go](https://golang.org/doc/install)
#### Download Sources
```
$ git clone https://github.com/hardcore-sushi/DroidFS.git
```
Gocryptfs need openssl to work:
```
$ cd DroidFS/app/libgocryptfs
$ wget -qO - https://www.openssl.org/source/openssl-1.1.1g.tar.gz | tar -xvzf -
```
#### Build
First, we need to build libgocryptfs.<br>
Retrieve your Android NDK installation path, usually someting like "\<Android SDK path\>/ndk/\<NDK version\>".
```
$ cd DroidFS/app/libgocryptfs
$ env ANDROID_NDK_HOME="<your ndk path>" OPENSSL_PATH="./openssl-1.1.1g" ./build.sh
```
Then, open the DroidFS project with Android Studio.<br>
If a device (virtual or physical) is connected, just click on "Run".<br>
If you want to generate a signed APK, you can follow this [post](https://stackoverflow.com/a/28938286).

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cmake_minimum_required(VERSION 3.4.1)
add_library(
gocryptfs
SHARED
IMPORTED
)
set_target_properties(
gocryptfs
PROPERTIES IMPORTED_LOCATION
${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/libgocryptfs.so
)
add_library(
gocryptfs_jni
SHARED
src/main/native/gocryptfs_jni.c
)
target_link_libraries(
gocryptfs_jni
gocryptfs
)
include_directories(
${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/
)

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apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 29
buildToolsVersion "30.0.0"
defaultConfig {
applicationId "sushi.hardcore.droidfs"
minSdkVersion 21
targetSdkVersion 28
versionCode 1
versionName "1.0"
ndk {
abiFilters 'x86_64', 'armeabi-v7a', 'arm64-v8a'
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path file('CMakeLists.txt')
}
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.0'
implementation 'androidx.appcompat:appcompat:1.1.0'
testImplementation 'junit:junit:4.12'
implementation 'androidx.sqlite:sqlite:2.1.0'
implementation 'androidx.preference:preference:1.1.1'
implementation 'com.github.clans:fab:1.6.4'
implementation 'com.jaredrummler:cyanea:1.0.2'
}

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openssl*
lib
include
build

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app/libgocryptfs/build.sh
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#!/bin/bash
if [ -z ${ANDROID_NDK_HOME+x} ]; then
echo "Error: \$ANDROID_NDK_HOME is not defined."
elif [ -z ${OPENSSL_PATH+x} ]; then
echo "Error: \$OPENSSL_PATH is not defined."
else
NDK_BIN_PATH="$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin"
declare -a ABIs=("x86_64" "arm64-v8a" "armeabi-v7a")
compile_openssl(){
if [ ! -d "./lib/$1" ]; then
if [ "$1" = "x86_64" ]; then
OPENSSL_ARCH="android-x86_64"
elif [ "$1" = "arm64-v8a" ]; then
OPENSSL_ARCH="android-arm64"
elif [ "$1" = "armeabi-v7a" ]; then
OPENSSL_ARCH="android-arm"
else
echo "Invalid ABI: $1"
exit
fi
export CFLAGS=-D__ANDROID_API__=21
export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH
(cd "$OPENSSL_PATH" && if [ -f "Makefile" ]; then make clean; fi && ./Configure $OPENSSL_ARCH -D__ANDROID_API__=21 no-stdio && make build_libs)
mkdir -p "./lib/$1" && cp "$OPENSSL_PATH/libcrypto.a" "$OPENSSL_PATH/libssl.a" "./lib/$1"
mkdir -p "./include/$1" && cp -r "$OPENSSL_PATH"/include/* "./include/$1/"
fi
}
compile_for_arch(){
compile_openssl $1
MAIN_PACKAGE="main.go"
if [ "$1" = "x86_64" ]; then
CFN="x86_64-linux-android21-clang"
elif [ "$1" = "arm64-v8a" ]; then
CFN="aarch64-linux-android21-clang"
export GOARCH=arm64
export GOARM=7
elif [ "$1" = "armeabi-v7a" ]; then
CFN="armv7a-linux-androideabi21-clang"
export GOARCH=arm
export GOARM=7
MAIN_PACKAGE="main32.go"
#patch arch specific code
sed "s/C.malloc(C.ulong/C.malloc(C.uint/g" main.go > $MAIN_PACKAGE
sed -i "s/st.Mtim.Sec/int64(st.Mtim.Sec)/g" $MAIN_PACKAGE
else
echo "Invalid ABI: $1"
exit
fi
export CC="$NDK_BIN_PATH/$CFN"
export CXX="$NDK_BIN_PATH/$CFN++"
export CGO_ENABLED=1
export GOOS=android
export CGO_CFLAGS="-I ${PWD}/include/$1"
export CGO_LDFLAGS="-Wl,-soname=libgocryptfs.so -L${PWD}/lib/$1"
go build -o build/$1/libgocryptfs.so -buildmode=c-shared $MAIN_PACKAGE
if [ $MAIN_PACKAGE = "main32.go" ]; then
rm $MAIN_PACKAGE
fi
}
if [ "$#" -eq 1 ]; then
compile_for_arch $1
else
for abi in ${ABIs[@]}; do
echo "Compiling for $abi..."
compile_for_arch $abi
done
fi
echo "Done."
fi

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// Package cryptocore wraps OpenSSL and Go GCM crypto and provides
// a nonce generator.
package cryptocore
import (
"crypto/aes"
"crypto/cipher"
"crypto/sha512"
"fmt"
"log"
"runtime"
"../eme"
"../siv_aead"
"../stupidgcm"
)
const (
// KeyLen is the cipher key length in bytes. 32 for AES-256.
KeyLen = 32
// AuthTagLen is the length of a GCM auth tag in bytes.
AuthTagLen = 16
)
// AEADTypeEnum indicates the type of AEAD backend in use.
type AEADTypeEnum int
const (
// BackendOpenSSL specifies the OpenSSL backend.
BackendOpenSSL AEADTypeEnum = 3
// BackendGoGCM specifies the Go based GCM backend.
BackendGoGCM AEADTypeEnum = 4
// BackendAESSIV specifies an AESSIV backend.
BackendAESSIV AEADTypeEnum = 5
)
// CryptoCore is the low level crypto implementation.
type CryptoCore struct {
// EME is used for filename encryption.
EMECipher *eme.EMECipher
// GCM or AES-SIV. This is used for content encryption.
AEADCipher cipher.AEAD
// Which backend is behind AEADCipher?
AEADBackend AEADTypeEnum
// GCM needs unique IVs (nonces)
IVGenerator *nonceGenerator
IVLen int
}
// New returns a new CryptoCore object or panics.
//
// Even though the "GCMIV128" feature flag is now mandatory, we must still
// support 96-bit IVs here because they were used for encrypting the master
// key in gocryptfs.conf up to gocryptfs v1.2. v1.3 switched to 128 bits.
//
// Note: "key" is either the scrypt hash of the password (when decrypting
// a config file) or the masterkey (when finally mounting the filesystem).
func New(key []byte, aeadType AEADTypeEnum, IVBitLen int, useHKDF bool, forceDecode bool) *CryptoCore {
if len(key) != KeyLen {
log.Panic(fmt.Sprintf("Unsupported key length %d", len(key)))
}
// We want the IV size in bytes
IVLen := IVBitLen / 8
// Initialize EME for filename encryption.
var emeCipher *eme.EMECipher
var err error
{
var emeBlockCipher cipher.Block
if useHKDF {
emeKey := HkdfDerive(key, HkdfInfoEMENames, KeyLen)
emeBlockCipher, err = aes.NewCipher(emeKey)
for i := range emeKey {
emeKey[i] = 0
}
} else {
emeBlockCipher, err = aes.NewCipher(key)
}
if err != nil {
log.Panic(err)
}
emeCipher = eme.New(emeBlockCipher)
}
// Initialize an AEAD cipher for file content encryption.
var aeadCipher cipher.AEAD
if aeadType == BackendOpenSSL || aeadType == BackendGoGCM {
var gcmKey []byte
if useHKDF {
gcmKey = HkdfDerive(key, hkdfInfoGCMContent, KeyLen)
} else {
gcmKey = append([]byte{}, key...)
}
switch aeadType {
case BackendOpenSSL:
if IVLen != 16 {
log.Panic("stupidgcm only supports 128-bit IVs")
}
aeadCipher = stupidgcm.New(gcmKey, forceDecode)
case BackendGoGCM:
goGcmBlockCipher, err := aes.NewCipher(gcmKey)
if err != nil {
log.Panic(err)
}
aeadCipher, err = cipher.NewGCMWithNonceSize(goGcmBlockCipher, IVLen)
if err != nil {
log.Panic(err)
}
}
for i := range gcmKey {
gcmKey[i] = 0
}
} else if aeadType == BackendAESSIV {
if IVLen != 16 {
// SIV supports any nonce size, but we only use 16.
log.Panic("AES-SIV must use 16-byte nonces")
}
// AES-SIV uses 1/2 of the key for authentication, 1/2 for
// encryption, so we need a 64-bytes key for AES-256. Derive it from
// the 32-byte master key using HKDF, or, for older filesystems, with
// SHA256.
var key64 []byte
if useHKDF {
key64 = HkdfDerive(key, hkdfInfoSIVContent, siv_aead.KeyLen)
} else {
s := sha512.Sum512(key)
key64 = s[:]
}
aeadCipher = siv_aead.New(key64)
for i := range key64 {
key64[i] = 0
}
} else {
log.Panic("unknown backend cipher")
}
return &CryptoCore{
EMECipher: emeCipher,
AEADCipher: aeadCipher,
AEADBackend: aeadType,
IVGenerator: &nonceGenerator{nonceLen: IVLen},
IVLen: IVLen,
}
}
type wiper interface {
Wipe()
}
// Wipe tries to wipe secret keys from memory by overwriting them with zeros
// and/or setting references to nil.
//
// This is not bulletproof due to possible GC copies, but
// still raises to bar for extracting the key.
func (c *CryptoCore) Wipe() {
be := c.AEADBackend
if be == BackendOpenSSL || be == BackendAESSIV {
// We don't use "x, ok :=" because we *want* to crash loudly if the
// type assertion fails.
w := c.AEADCipher.(wiper)
w.Wipe()
}
// We have no access to the keys (or key-equivalents) stored inside the
// Go stdlib. Best we can is to nil the references and force a GC.
c.AEADCipher = nil
c.EMECipher = nil
runtime.GC()
}

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package cryptocore
import (
"crypto/sha256"
"log"
"golang.org/x/crypto/hkdf"
)
const (
// "info" data that HKDF mixes into the generated key to make it unique.
// For convenience, we use a readable string.
HkdfInfoEMENames = "EME filename encryption"
hkdfInfoGCMContent = "AES-GCM file content encryption"
hkdfInfoSIVContent = "AES-SIV file content encryption"
)
// hkdfDerive derives "outLen" bytes from "masterkey" and "info" using
// HKDF-SHA256 (RFC 5869).
// It returns the derived bytes or panics.
func HkdfDerive(masterkey []byte, info string, outLen int) (out []byte) {
h := hkdf.New(sha256.New, masterkey, nil, []byte(info))
out = make([]byte, outLen)
n, err := h.Read(out)
if n != outLen || err != nil {
log.Panicf("hkdfDerive: hkdf read failed, got %d bytes, error: %v", n, err)
}
return out
}

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package cryptocore
import (
"crypto/rand"
"encoding/binary"
"log"
)
// RandBytes gets "n" random bytes from /dev/urandom or panics
func RandBytes(n int) []byte {
b := make([]byte, n)
_, err := rand.Read(b)
if err != nil {
log.Panic("Failed to read random bytes: " + err.Error())
}
return b
}
// RandUint64 returns a secure random uint64
func RandUint64() uint64 {
b := RandBytes(8)
return binary.BigEndian.Uint64(b)
}
type nonceGenerator struct {
nonceLen int // bytes
}
// Get a random "nonceLen"-byte nonce
func (n *nonceGenerator) Get() []byte {
return randPrefetcher.read(n.nonceLen)
}

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package cryptocore
import (
"bytes"
"log"
"sync"
)
// Number of bytes to prefetch.
// 512 looks like a good compromise between throughput and latency - see
// randsize_test.go for numbers.
const prefetchN = 512
func init() {
randPrefetcher.refill = make(chan []byte)
go randPrefetcher.refillWorker()
}
type randPrefetcherT struct {
sync.Mutex
buf bytes.Buffer
refill chan []byte
}
func (r *randPrefetcherT) read(want int) (out []byte) {
out = make([]byte, want)
r.Lock()
// Note: don't use defer, it slows us down!
have, err := r.buf.Read(out)
if have == want && err == nil {
r.Unlock()
return out
}
// Buffer was empty -> re-fill
fresh := <-r.refill
if len(fresh) != prefetchN {
log.Panicf("randPrefetcher: refill: got %d bytes instead of %d", len(fresh), prefetchN)
}
r.buf.Reset()
r.buf.Write(fresh)
have, err = r.buf.Read(out)
if have != want || err != nil {
log.Panicf("randPrefetcher could not satisfy read: have=%d want=%d err=%v", have, want, err)
}
r.Unlock()
return out
}
func (r *randPrefetcherT) refillWorker() {
for {
r.refill <- RandBytes(prefetchN)
}
}
var randPrefetcher randPrefetcherT

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language: go
go:
- 1.11.x # Debian 10 "Buster"
- 1.12.x # Ubuntu 19.10
- 1.13.x # Debian 11 "Bullseye"
- stable
script:
- go build
- ./test.bash

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The MIT License (MIT)
Copyright (c) 2015 Jakob Unterwurzacher
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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EME for Go [![Build Status](https://travis-ci.org/rfjakob/eme.svg?branch=master)](https://travis-ci.org/rfjakob/eme) [![GoDoc](https://godoc.org/github.com/rfjakob/eme?status.svg)](https://godoc.org/github.com/rfjakob/eme) ![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)
==========
**EME** (ECB-Mix-ECB or, clearer, **Encrypt-Mix-Encrypt**) is a wide-block
encryption mode developed by Halevi
and Rogaway in 2003 [[eme]](#eme).
EME uses multiple invocations of a block cipher to construct a new
cipher of bigger block size (in multiples of 16 bytes, up to 2048 bytes).
Quoting from the original [[eme]](#eme) paper:
> We describe a block-cipher mode of operation, EME, that turns an n-bit block cipher into
> a tweakable enciphering scheme that acts on strings of mn bits, where m ∈ [1..n]. The mode is
> parallelizable, but as serial-efficient as the non-parallelizable mode CMC [6]. EME can be used
> to solve the disk-sector encryption problem. The algorithm entails two layers of ECB encryption
> and a “lightweight mixing” in between. We prove EME secure, in the reduction-based sense of
> modern cryptography.
Figure 2 from the [[eme]](#eme) paper shows an overview of the transformation:
[![Figure 2 from [eme]](paper-eme-fig2.png)](#)
This is an implementation of EME in Go, complete with test vectors from IEEE [[p1619-2]](#p1619-2)
and Halevi [[eme-32-testvec]](#eme-32-testvec).
It has no dependencies outside the standard library.
Is it patentend?
----------------
In 2007, the UC Davis has decided to abandon [[patabandon]](#patabandon)
the patent application [[patappl]](#patappl) for EME.
Related algorithms
------------------
**EME-32** is EME with the cipher set to AES and the length set to 512.
That is, EME-32 [[eme-32-pdf]](#eme-32-pdf) is a subset of EME.
**EME2**, also known as EME\* [[emestar]](#emestar), is an extended version of EME
that has built-in handling for data that is not a multiple of 16 bytes
long.
EME2 has been selected for standardization in IEEE P1619.2 [[p1619.2]](#p1619.2).
References
----------
#### [eme]
*A Parallelizable Enciphering Mode*
Shai Halevi, Phillip Rogaway, 28 Jul 2003
https://eprint.iacr.org/2003/147.pdf
Note: This is the original EME paper. EME is specified for an arbitrary
number of block-cipher blocks. EME-32 is a concrete implementation of
EME with a fixed length of 32 AES blocks.
#### [eme-32-email]
*Re: EME-32-AES with editorial comments*
Shai Halevi, 07 Jun 2005
http://grouper.ieee.org/groups/1619/email/msg00310.html
#### [eme-32-pdf]
*Draft Standard for Tweakable Wide-block Encryption*
Shai Halevi, 02 June 2005
http://grouper.ieee.org/groups/1619/email/pdf00020.pdf
Note: This is the latest version of the EME-32 draft that I could find. It
includes test vectors and C source code.
#### [eme-32-testvec]
*Re: Test vectors for LRW and EME*
Shai Halevi, 16 Nov 2004
http://grouper.ieee.org/groups/1619/email/msg00218.html
#### [emestar]
*EME\*: extending EME to handle arbitrary-length messages with associated data*
Shai Halevi, 27 May 2004
https://eprint.iacr.org/2004/125.pdf
#### [patabandon]
*Re: [P1619-2] Non-awareness patent statement made by UC Davis*
Mat Ball, 26 Nov 2007
http://grouper.ieee.org/groups/1619/email-2/msg00005.html
#### [patappl]
*Block cipher mode of operation for constructing a wide-blocksize block cipher from a conventional block cipher*
US patent application US20040131182
http://www.google.com/patents/US20040131182
#### [p1619-2]
*IEEE P1619.2™/D9 Draft Standard for Wide-Block Encryption for Shared Storage Media*
IEEE, Dec 2008
http://siswg.net/index2.php?option=com_docman&task=doc_view&gid=156&Itemid=41
Note: This is a draft version. The final version is not freely available
and must be bought from IEEE.
Package Changelog
-----------------
v1.1.1, 2020-04-13
* Update `go vet` call in `test.bash` to work on recent Go versions
* No code changes
v1.1, 2017-03-05
* Add eme.New() / \*EMECipher convenience wrapper
* Improve panic message and parameter wording
v1.0, 2015-12-08
* Stable release

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#!/bin/bash -eu
go test -bench=.

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app/libgocryptfs/gocryptfs_internal/eme/eme.go
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// EME (ECB-Mix-ECB or, clearer, Encrypt-Mix-Encrypt) is a wide-block
// encryption mode developed by Halevi and Rogaway.
//
// It was presented in the 2003 paper "A Parallelizable Enciphering Mode" by
// Halevi and Rogaway.
//
// EME uses multiple invocations of a block cipher to construct a new cipher
// of bigger block size (in multiples of 16 bytes, up to 2048 bytes).
package eme
import (
"crypto/cipher"
"log"
)
type directionConst bool
const (
// Encrypt "inputData"
DirectionEncrypt = directionConst(true)
// Decrypt "inputData"
DirectionDecrypt = directionConst(false)
)
// multByTwo - GF multiplication as specified in the EME-32 draft
func multByTwo(out []byte, in []byte) {
if len(in) != 16 {
panic("len must be 16")
}
tmp := make([]byte, 16)
tmp[0] = 2 * in[0]
if in[15] >= 128 {
tmp[0] = tmp[0] ^ 135
}
for j := 1; j < 16; j++ {
tmp[j] = 2 * in[j]
if in[j-1] >= 128 {
tmp[j] += 1
}
}
copy(out, tmp)
}
func xorBlocks(out []byte, in1 []byte, in2 []byte) {
if len(in1) != len(in2) {
log.Panicf("len(in1)=%d is not equal to len(in2)=%d", len(in1), len(in2))
}
for i := range in1 {
out[i] = in1[i] ^ in2[i]
}
}
// aesTransform - encrypt or decrypt (according to "direction") using block
// cipher "bc" (typically AES)
func aesTransform(dst []byte, src []byte, direction directionConst, bc cipher.Block) {
if direction == DirectionEncrypt {
bc.Encrypt(dst, src)
return
} else if direction == DirectionDecrypt {
bc.Decrypt(dst, src)
return
}
}
// tabulateL - calculate L_i for messages up to a length of m cipher blocks
func tabulateL(bc cipher.Block, m int) [][]byte {
/* set L0 = 2*AESenc(K; 0) */
eZero := make([]byte, 16)
Li := make([]byte, 16)
bc.Encrypt(Li, eZero)
LTable := make([][]byte, m)
// Allocate pool once and slice into m pieces in the loop
pool := make([]byte, m*16)
for i := 0; i < m; i++ {
multByTwo(Li, Li)
LTable[i] = pool[i*16 : (i+1)*16]
copy(LTable[i], Li)
}
return LTable
}
// Transform - EME-encrypt or EME-decrypt, according to "direction"
// (defined in the constants DirectionEncrypt and DirectionDecrypt).
// The data in "inputData" is en- or decrypted with the block ciper "bc" under
// "tweak" (also known as IV).
//
// The tweak is used to randomize the encryption in the same way as an
// IV. A use of this encryption mode envisioned by the authors of the
// algorithm was to encrypt each sector of a disk, with the tweak
// being the sector number. If you encipher the same data with the
// same tweak you will get the same ciphertext.
//
// The result is returned in a freshly allocated slice of the same
// size as inputData.
//
// Limitations:
// * The block cipher must have block size 16 (usually AES).
// * The size of "tweak" must be 16
// * "inputData" must be a multiple of 16 bytes long
// If any of these pre-conditions are not met, the function will panic.
//
// Note that you probably don't want to call this function directly and instead
// use eme.New(), which provides conventient wrappers.
func Transform(bc cipher.Block, tweak []byte, inputData []byte, direction directionConst) []byte {
// In the paper, the tweak is just called "T". Call it the same here to
// make following the paper easy.
T := tweak
// In the paper, the plaintext data is called "P" and the ciphertext is
// called "C". Because encryption and decryption are virtually identical,
// we share the code and always call the input data "P" and the output data
// "C", regardless of the direction.
P := inputData
if bc.BlockSize() != 16 {
log.Panicf("Using a block size other than 16 is not implemented")
}
if len(T) != 16 {
log.Panicf("Tweak must be 16 bytes long, is %d", len(T))
}
if len(P)%16 != 0 {
log.Panicf("Data P must be a multiple of 16 long, is %d", len(P))
}
m := len(P) / 16
if m == 0 || m > 16*8 {
log.Panicf("EME operates on 1 to %d block-cipher blocks, you passed %d", 16*8, m)
}
C := make([]byte, len(P))
LTable := tabulateL(bc, m)
PPj := make([]byte, 16)
for j := 0; j < m; j++ {
Pj := P[j*16 : (j+1)*16]
/* PPj = 2**(j-1)*L xor Pj */
xorBlocks(PPj, Pj, LTable[j])
/* PPPj = AESenc(K; PPj) */
aesTransform(C[j*16:(j+1)*16], PPj, direction, bc)
}
/* MP =(xorSum PPPj) xor T */
MP := make([]byte, 16)
xorBlocks(MP, C[0:16], T)
for j := 1; j < m; j++ {
xorBlocks(MP, MP, C[j*16:(j+1)*16])
}
/* MC = AESenc(K; MP) */
MC := make([]byte, 16)
aesTransform(MC, MP, direction, bc)
/* M = MP xor MC */
M := make([]byte, 16)
xorBlocks(M, MP, MC)
CCCj := make([]byte, 16)
for j := 1; j < m; j++ {
multByTwo(M, M)
/* CCCj = 2**(j-1)*M xor PPPj */
xorBlocks(CCCj, C[j*16:(j+1)*16], M)
copy(C[j*16:(j+1)*16], CCCj)
}
/* CCC1 = (xorSum CCCj) xor T xor MC */
CCC1 := make([]byte, 16)
xorBlocks(CCC1, MC, T)
for j := 1; j < m; j++ {
xorBlocks(CCC1, CCC1, C[j*16:(j+1)*16])
}
copy(C[0:16], CCC1)
for j := 0; j < m; j++ {
/* CCj = AES-enc(K; CCCj) */
aesTransform(C[j*16:(j+1)*16], C[j*16:(j+1)*16], direction, bc)
/* Cj = 2**(j-1)*L xor CCj */
xorBlocks(C[j*16:(j+1)*16], C[j*16:(j+1)*16], LTable[j])
}
return C
}
// EMECipher provides EME-Encryption and -Decryption functions that are more
// convenient than calling Transform directly.
type EMECipher struct {
bc cipher.Block
}
// New returns a new EMECipher object. "bc" must have a block size of 16,
// or subsequent calls to Encrypt and Decrypt will panic.
func New(bc cipher.Block) *EMECipher {
return &EMECipher{
bc: bc,
}
}
// Encrypt is equivalent to calling Transform with direction=DirectionEncrypt.
func (e *EMECipher) Encrypt(tweak []byte, inputData []byte) []byte {
return Transform(e.bc, tweak, inputData, DirectionEncrypt)
}
// Decrypt is equivalent to calling Transform with direction=DirectionDecrypt.
func (e *EMECipher) Decrypt(tweak []byte, inputData []byte) []byte {
return Transform(e.bc, tweak, inputData, DirectionDecrypt)
}

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// Package exitcodes contains all well-defined exit codes that gocryptfs
// can return.
package exitcodes
import (
"fmt"
"os"
)
const (
// Usage - usage error like wrong cli syntax, wrong number of parameters.
Usage = 1
// 2 is reserved because it is used by Go panic
// 3 is reserved because it was used by earlier gocryptfs version as a generic
// "mount" error.
// CipherDir means that the CIPHERDIR does not exist, is not empty, or is not
// a directory.
CipherDir = 6
// Init is an error on filesystem init
Init = 7
// LoadConf is an error while loading gocryptfs.conf
LoadConf = 8
// ReadPassword means something went wrong reading the password
ReadPassword = 9
// MountPoint error means that the mountpoint is invalid (not empty etc).
MountPoint = 10
// Other error - please inspect the message
Other = 11
// PasswordIncorrect - the password was incorrect when mounting or when
// changing the password.
PasswordIncorrect = 12
// ScryptParams means that scrypt was called with invalid parameters
ScryptParams = 13
// MasterKey means that something went wrong when parsing the "-masterkey"
// command line option
MasterKey = 14
// SigInt means we got SIGINT
SigInt = 15
// PanicLogNotEmpty means the panic log was not empty when we were unmounted
PanicLogNotEmpty = 16
// ForkChild means forking the worker child failed
ForkChild = 17
// OpenSSL means you tried to enable OpenSSL, but we were compiled without it.
OpenSSL = 18
// FuseNewServer - this exit code means that the call to fuse.NewServer failed.
// This usually means that there was a problem executing fusermount, or
// fusermount could not attach the mountpoint to the kernel.
FuseNewServer = 19
// CtlSock - the control socket file could not be created.
CtlSock = 20
// Downgraded to a warning in gocryptfs v1.4
//PanicLogCreate = 21
// PasswordEmpty - we received an empty password
PasswordEmpty = 22
// OpenConf - the was an error opening the gocryptfs.conf file for reading
OpenConf = 23
// WriteConf - could not write the gocryptfs.conf
WriteConf = 24
// Profiler - error occurred when trying to write cpu or memory profile or
// execution trace
Profiler = 25
// FsckErrors - the filesystem check found errors
FsckErrors = 26
// DeprecatedFS - this filesystem is deprecated
DeprecatedFS = 27
// skip 28
// ExcludeError - an error occurred while processing "-exclude"
ExcludeError = 29
// DevNull means that /dev/null could not be opened
DevNull = 30
)
// Err wraps an error with an associated numeric exit code
type Err struct {
error
code int
}
// NewErr returns an error containing "msg" and the exit code "code".
func NewErr(msg string, code int) Err {
return Err{
error: fmt.Errorf(msg),
code: code,
}
}
// Exit extracts the numeric exit code from "err" (if available) and exits the
// application.
func Exit(err error) {
err2, ok := err.(Err)
if !ok {