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|
||||
"proc-macro2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "rand_core"
|
||||
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||||
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|
||||
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|
||||
dependencies = [
|
||||
"getrandom",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "ring"
|
||||
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
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||||
dependencies = [
|
||||
"cc",
|
||||
"libc",
|
||||
"once_cell",
|
||||
"spin",
|
||||
"untrusted",
|
||||
"web-sys",
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "rustcryptfs"
|
||||
version = "0.0.1"
|
||||
dependencies = [
|
||||
"aes-gcm",
|
||||
"anyhow",
|
||||
"base64",
|
||||
"cipher 0.4.3",
|
||||
"clap",
|
||||
"hkdf",
|
||||
"log",
|
||||
"rustls",
|
||||
"scrypt",
|
||||
"serde",
|
||||
"serde_json",
|
||||
"sha2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
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||||
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||||
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||||
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||||
dependencies = [
|
||||
"log",
|
||||
"ring",
|
||||
"sct",
|
||||
"webpki",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "ryu"
|
||||
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||||
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||||
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||||
|
||||
[[package]]
|
||||
name = "salsa20"
|
||||
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||||
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||||
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||||
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|
||||
"cipher 0.3.0",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "scrypt"
|
||||
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|
||||
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|
||||
checksum = "e73d6d7c6311ebdbd9184ad6c4447b2f36337e327bda107d3ba9e3c374f9d325"
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||||
dependencies = [
|
||||
"hmac",
|
||||
"password-hash",
|
||||
"pbkdf2",
|
||||
"salsa20",
|
||||
"sha2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "sct"
|
||||
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||||
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||||
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||||
dependencies = [
|
||||
"ring",
|
||||
"untrusted",
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||||
]
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||||
|
||||
[[package]]
|
||||
name = "serde"
|
||||
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||||
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||||
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||||
dependencies = [
|
||||
"serde_derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "serde_derive"
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||||
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||||
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||||
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||||
dependencies = [
|
||||
"proc-macro2",
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||||
"quote",
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||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "serde_json"
|
||||
version = "1.0.78"
|
||||
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||||
checksum = "d23c1ba4cf0efd44be32017709280b32d1cea5c3f1275c3b6d9e8bc54f758085"
|
||||
dependencies = [
|
||||
"itoa",
|
||||
"ryu",
|
||||
"serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "sha2"
|
||||
version = "0.10.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "55deaec60f81eefe3cce0dc50bda92d6d8e88f2a27df7c5033b42afeb1ed2676"
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||||
dependencies = [
|
||||
"cfg-if",
|
||||
"cpufeatures",
|
||||
"digest",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "spin"
|
||||
version = "0.5.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
|
||||
|
||||
[[package]]
|
||||
name = "strsim"
|
||||
version = "0.10.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
|
||||
|
||||
[[package]]
|
||||
name = "subtle"
|
||||
version = "2.4.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.86"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
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||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-xid",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "termcolor"
|
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"winapi-util",
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]
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|
||||
[[package]]
|
||||
name = "textwrap"
|
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source = "registry+https://github.com/rust-lang/crates.io-index"
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|
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[[package]]
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name = "typenum"
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[[package]]
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name = "unicode-xid"
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[[package]]
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name = "universal-hash"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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]
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|
||||
[[package]]
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name = "untrusted"
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[[package]]
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[[package]]
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[[package]]
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name = "wasm-bindgen"
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"cfg-if",
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||||
"wasm-bindgen-macro",
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||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-backend"
|
||||
version = "0.2.79"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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||||
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||||
dependencies = [
|
||||
"bumpalo",
|
||||
"lazy_static",
|
||||
"log",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"wasm-bindgen-shared",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-macro"
|
||||
version = "0.2.79"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2f4203d69e40a52ee523b2529a773d5ffc1dc0071801c87b3d270b471b80ed01"
|
||||
dependencies = [
|
||||
"quote",
|
||||
"wasm-bindgen-macro-support",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-macro-support"
|
||||
version = "0.2.79"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bfa8a30d46208db204854cadbb5d4baf5fcf8071ba5bf48190c3e59937962ebc"
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||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"wasm-bindgen-backend",
|
||||
"wasm-bindgen-shared",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-shared"
|
||||
version = "0.2.79"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "3d958d035c4438e28c70e4321a2911302f10135ce78a9c7834c0cab4123d06a2"
|
||||
|
||||
[[package]]
|
||||
name = "web-sys"
|
||||
version = "0.3.56"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c060b319f29dd25724f09a2ba1418f142f539b2be99fbf4d2d5a8f7330afb8eb"
|
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dependencies = [
|
||||
"js-sys",
|
||||
"wasm-bindgen",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "webpki"
|
||||
version = "0.22.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f095d78192e208183081cc07bc5515ef55216397af48b873e5edcd72637fa1bd"
|
||||
dependencies = [
|
||||
"ring",
|
||||
"untrusted",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-util"
|
||||
version = "0.1.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
|
||||
dependencies = [
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
[package]
|
||||
name = "rustcryptfs"
|
||||
version = "0.0.1"
|
||||
edition = "2021"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
anyhow = "1.0.53"
|
||||
base64 = "0.13.0"
|
||||
rustls = "0.20.2"
|
||||
scrypt = "0.8"
|
||||
serde = { version = "1.0.136", features = ["derive"] }
|
||||
serde_json = "1.0.78"
|
||||
aes-gcm = "0.9.4"
|
||||
hkdf = "0.12.2"
|
||||
sha2 = "0.10.2"
|
||||
cipher = "0.4.3"
|
||||
clap = { version = "3.1.18", features = ["derive"] }
|
||||
log = "0.4.17"
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
use clap::{Parser, Subcommand};
|
||||
|
||||
#[derive(Debug, Parser)]
|
||||
#[clap(author, version, about, long_about = None)]
|
||||
pub(crate) struct Args {
|
||||
#[clap(subcommand)]
|
||||
pub(crate) command: Commands,
|
||||
}
|
||||
|
||||
#[derive(Debug, Subcommand)]
|
||||
pub(crate) enum Commands {
|
||||
/// Decrypt a file
|
||||
Decrypt(DecryptCommand),
|
||||
}
|
||||
|
||||
#[derive(Debug, Parser)]
|
||||
pub(crate) struct DecryptCommand {
|
||||
/// The file to decrypt
|
||||
pub(crate) file_path : String,
|
||||
|
||||
/// Path to the gocryptfs.conf
|
||||
#[clap(short('c'), long)]
|
||||
pub(crate) gocryptfs_conf_path : Option<String>,
|
||||
|
||||
/// The password
|
||||
#[clap(short, long)]
|
||||
pub(crate) password : Option<String>
|
||||
}
|
||||
|
|
@ -0,0 +1,124 @@
|
|||
use std::collections::HashSet;
|
||||
|
||||
use aes_gcm::{
|
||||
aead::{generic_array::GenericArray, AeadInPlace},
|
||||
aes::Aes256,
|
||||
AesGcm, Key, NewAead,
|
||||
};
|
||||
use hkdf::Hkdf;
|
||||
|
||||
#[derive(serde::Deserialize, Debug, PartialEq, Eq, Hash)]
|
||||
pub(crate) enum FeatureFlag {
|
||||
/// FlagPlaintextNames indicates that filenames are unencrypted.
|
||||
PlaintextNames,
|
||||
/// FlagDirIV indicates that a per-directory IV file is used.
|
||||
DirIV,
|
||||
/// FlagEMENames indicates EME (ECB-Mix-ECB) filename encryption.
|
||||
///
|
||||
/// This flag is mandatory since gocryptfs v1.0.
|
||||
EMENames,
|
||||
/// FlagGCMIV128 indicates 128-bit GCM IVs.
|
||||
///
|
||||
/// This flag is mandatory since gocryptfs v1.0, except when XChaCha20Poly1305 is used.
|
||||
GCMIV128,
|
||||
/// FlagLongNames allows file names longer than 175 bytes.
|
||||
LongNames,
|
||||
/// FlagLongNameMax sets a custom name length limit, names longer than that will be hashed.
|
||||
LongNameMax,
|
||||
/// FlagAESSIV selects an AES-SIV based crypto backend.
|
||||
AESSIV,
|
||||
/// FlagRaw64 enables raw (unpadded) base64 encoding for file names.
|
||||
Raw64,
|
||||
/// FlagHKDF enables HKDF-derived keys for use with GCM, EME and SIV
|
||||
/// instead of directly using the master key (GCM and EME) or the SHA-512
|
||||
/// hashed master key (SIV).
|
||||
///
|
||||
/// Note that this flag does not change the password hashing algorithm
|
||||
/// which always is scrypt.
|
||||
HKDF,
|
||||
/// FlagFIDO2 means that "-fido2" was used when creating the filesystem.
|
||||
///
|
||||
/// The masterkey is protected using a FIDO2 token instead of a password.
|
||||
FIDO2,
|
||||
/// FlagXChaCha20Poly1305 means we use XChaCha20-Poly1305 file content encryption
|
||||
XChaCha20Poly1305,
|
||||
}
|
||||
|
||||
#[derive(serde::Deserialize, Debug)]
|
||||
pub(crate) struct CryptConf {
|
||||
#[serde(rename = "Creator")]
|
||||
creator: String,
|
||||
#[serde(rename = "EncryptedKey")]
|
||||
encrypted_key: String,
|
||||
#[serde(rename = "ScryptObject")]
|
||||
pub scrypt_object: ScryptObject,
|
||||
#[serde(rename = "Version")]
|
||||
version: u8,
|
||||
#[serde(rename = "FeatureFlags")]
|
||||
feature_flags: HashSet<FeatureFlag>,
|
||||
}
|
||||
|
||||
impl CryptConf {
|
||||
pub(crate) fn get_master_key(&self, password: &[u8]) -> anyhow::Result<Vec<u8>> {
|
||||
let block = base64::decode(&self.encrypted_key)?;
|
||||
let key = self.scrypt_object.get_hkdf_key(password)?;
|
||||
|
||||
let nonce = &block[..16];
|
||||
let tag = &block[block.len() - 16..];
|
||||
let ciphertext = &block[16..block.len() - 16];
|
||||
|
||||
let mut buf = Vec::from(ciphertext);
|
||||
|
||||
let aes = AesGcm::<Aes256, cipher::consts::U16>::new(Key::from_slice(&key));
|
||||
|
||||
aes.decrypt_in_place_detached(
|
||||
GenericArray::from_slice(&nonce),
|
||||
&[0u8, 0, 0, 0, 0, 0, 0, 0],
|
||||
&mut buf,
|
||||
GenericArray::from_slice(tag),
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
pub(crate) fn have_feature_flag(&self, flag: &FeatureFlag) -> bool {
|
||||
self.feature_flags.contains(flag)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(serde::Deserialize, Debug)]
|
||||
pub(crate) struct ScryptObject {
|
||||
#[serde(rename = "Salt")]
|
||||
salt: String,
|
||||
#[serde(rename = "N")]
|
||||
n: u32,
|
||||
#[serde(rename = "R")]
|
||||
r: u32,
|
||||
#[serde(rename = "P")]
|
||||
p: u32,
|
||||
#[serde(rename = "KeyLen")]
|
||||
key_len: u32,
|
||||
}
|
||||
|
||||
impl ScryptObject {
|
||||
pub(crate) fn get_hkdf_key(&self, password: &[u8]) -> anyhow::Result<Vec<u8>> {
|
||||
let mut key = [0u8; 32];
|
||||
|
||||
let params = scrypt::Params::new((self.n as f64).log2() as u8, self.r, self.p)?;
|
||||
|
||||
scrypt::scrypt(
|
||||
password,
|
||||
&base64::decode(&self.salt).unwrap(),
|
||||
¶ms,
|
||||
&mut key,
|
||||
)?;
|
||||
|
||||
let hdkf = Hkdf::<sha2::Sha256>::new(None, &key);
|
||||
|
||||
hdkf.expand(b"AES-GCM file content encryption", &mut key)
|
||||
.unwrap();
|
||||
|
||||
Ok(key.to_vec())
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
use aes_gcm::{
|
||||
aead::generic_array::GenericArray, aes::Aes256, AeadInPlace, NewAead, AesGcm,
|
||||
};
|
||||
use cipher::consts::U32;
|
||||
use hkdf::Hkdf;
|
||||
|
||||
pub struct ContentEnc {
|
||||
key: GenericArray<u8, U32>,
|
||||
iv_len: usize,
|
||||
}
|
||||
|
||||
impl ContentEnc {
|
||||
pub fn new(master_key: &[u8], iv_len: u8) -> Self {
|
||||
let mut key = [0u8; 32];
|
||||
let hdkf = Hkdf::<sha2::Sha256>::new(None, &master_key);
|
||||
hdkf.expand(b"AES-GCM file content encryption", &mut key)
|
||||
.unwrap();
|
||||
|
||||
Self {
|
||||
key: GenericArray::from(key),
|
||||
iv_len: iv_len as usize,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn decrypt_block(
|
||||
&self,
|
||||
block: &[u8],
|
||||
block_number: u64,
|
||||
file_id: Option<&[u8]>,
|
||||
) -> anyhow::Result<Vec<u8>> {
|
||||
// TODO NOT BOX
|
||||
if block.len() == 0 {
|
||||
return Ok(block.into());
|
||||
}
|
||||
|
||||
if block.iter().all(|f| *f == 0) {
|
||||
todo!("black hole")
|
||||
}
|
||||
|
||||
if block.len() < self.iv_len {
|
||||
return Err(anyhow::Error::msg("Block is too short"));
|
||||
}
|
||||
|
||||
let nonce = &block[..self.iv_len];
|
||||
let tag = &block[block.len() - self.iv_len..];
|
||||
let ciphertext = &block[self.iv_len..block.len() - self.iv_len];
|
||||
|
||||
if nonce.iter().all(|f| *f == 0) {
|
||||
return Err(anyhow::Error::msg("all-zero nonce"));
|
||||
}
|
||||
|
||||
let mut buf = Vec::from(ciphertext);
|
||||
|
||||
let mut aad = Vec::from(block_number.to_be_bytes());
|
||||
if let Some(file_id) = file_id {
|
||||
aad.extend(file_id);
|
||||
}
|
||||
|
||||
let aes = AesGcm::<Aes256, cipher::consts::U16>::new(&self.key);
|
||||
|
||||
aes.decrypt_in_place_detached(
|
||||
GenericArray::from_slice(nonce),
|
||||
&aad,
|
||||
&mut buf,
|
||||
GenericArray::from_slice(tag),
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
return Ok(buf);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
use std::{
|
||||
fs::{self, File},
|
||||
io::{BufWriter, Read, Write},
|
||||
path::{Path, PathBuf},
|
||||
};
|
||||
|
||||
use anyhow::Context;
|
||||
use args::DecryptCommand;
|
||||
use clap::Parser;
|
||||
|
||||
use crate::content_enc::ContentEnc;
|
||||
|
||||
mod args;
|
||||
mod config;
|
||||
mod content_enc;
|
||||
|
||||
fn main() -> anyhow::Result<()> {
|
||||
let args = args::Args::parse();
|
||||
log::debug!("{:?}", args);
|
||||
|
||||
match &args.command {
|
||||
args::Commands::Decrypt(c) => decrypt_file(c),
|
||||
}
|
||||
}
|
||||
|
||||
fn decrypt_file(c: &DecryptCommand) -> anyhow::Result<()> {
|
||||
let file_path = Path::new(&c.file_path);
|
||||
let config_path = c
|
||||
.gocryptfs_conf_path
|
||||
.as_ref()
|
||||
.map(|p| PathBuf::from(p))
|
||||
.unwrap_or_else(|| file_path.parent().unwrap().join("gocryptfs.conf"));
|
||||
|
||||
let content = fs::read_to_string(config_path)?;
|
||||
|
||||
let conf: config::CryptConf =
|
||||
serde_json::from_str(&content).context("Failed to decode configuration")?;
|
||||
|
||||
let mut file = File::open(file_path).unwrap();
|
||||
|
||||
let master_key = conf.get_master_key(c.password.as_ref().unwrap().as_bytes())?;
|
||||
|
||||
let enc = ContentEnc::new(&master_key, 16);
|
||||
|
||||
let mut buf = [0u8; 18];
|
||||
let n = file.read(&mut buf)?;
|
||||
let id = if n < 18 { None } else { Some(&buf[2..]) };
|
||||
|
||||
let mut buf = [0u8; 4096 + 32];
|
||||
let stdout = std::io::stdout();
|
||||
let mut stdout = BufWriter::new(stdout.lock());
|
||||
|
||||
let mut block_index = 0;
|
||||
loop {
|
||||
let n = file.read(&mut buf)?;
|
||||
let res = enc.decrypt_block(&buf[..n], block_index, id)?;
|
||||
|
||||
stdout.write_all(&res)?;
|
||||
|
||||
if res.len() == 0 {
|
||||
break;
|
||||
}
|
||||
|
||||
block_index += 1;
|
||||
}
|
||||
stdout.flush()?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
Loading…
Reference in New Issue