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move encryption key maker into LegacySdaCompatible impl

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This commit is contained in:
Carson McManus 2021-08-19 17:15:10 -04:00
parent e611e31ad3
commit 71edb794c1
1 changed files with 29 additions and 21 deletions
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50
src/encryption.rs
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@ -6,25 +6,9 @@ use ring::rand::SecureRandom;
use serde::{Deserialize, Serialize};
use thiserror::Error;
const PBKDF2_ITERATIONS: u32 = 50000; // This is excessive, but necessary to maintain compatibility with SteamDesktopAuthenticator.
const SALT_LENGTH: usize = 8;
const KEY_SIZE_BYTES: usize = 32;
const IV_LENGTH: usize = 16;
fn get_encryption_key(passkey: &String, salt: &String) -> anyhow::Result<[u8; KEY_SIZE_BYTES]> {
let password_bytes = passkey.as_bytes();
let salt_bytes = base64::decode(salt)?;
let mut full_key: [u8; KEY_SIZE_BYTES] = [0u8; KEY_SIZE_BYTES];
pbkdf2::derive(
pbkdf2::PBKDF2_HMAC_SHA1,
std::num::NonZeroU32::new(PBKDF2_ITERATIONS).unwrap(),
&salt_bytes,
password_bytes,
&mut full_key,
);
return Ok(full_key);
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EntryEncryptionParams {
#[serde(rename = "encryption_iv")]
@ -53,7 +37,7 @@ impl EntryEncryptionParams {
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum EncryptionScheme {
/// Encryption scheme that is compatible with SteamDesktopAuthenticator.
LegacySdaCompatible = 0,
LegacySdaCompatible = -1,
}
impl Default for EncryptionScheme {
@ -78,6 +62,28 @@ pub trait EntryEncryptor {
/// Encryption scheme that is compatible with SteamDesktopAuthenticator.
pub struct LegacySdaCompatible;
impl LegacySdaCompatible {
const PBKDF2_ITERATIONS: u32 = 50000; // This is excessive, but necessary to maintain compatibility with SteamDesktopAuthenticator.
const KEY_SIZE_BYTES: usize = 32;
fn get_encryption_key(
passkey: &String,
salt: &String,
) -> anyhow::Result<[u8; Self::KEY_SIZE_BYTES]> {
let password_bytes = passkey.as_bytes();
let salt_bytes = base64::decode(salt)?;
let mut full_key: [u8; Self::KEY_SIZE_BYTES] = [0u8; Self::KEY_SIZE_BYTES];
pbkdf2::derive(
pbkdf2::PBKDF2_HMAC_SHA1,
std::num::NonZeroU32::new(Self::PBKDF2_ITERATIONS).unwrap(),
&salt_bytes,
password_bytes,
&mut full_key,
);
return Ok(full_key);
}
}
type Aes256Cbc = Cbc<Aes256, NoPadding>;
impl EntryEncryptor for LegacySdaCompatible {
// ngl, this logic sucks ass. its kinda annoying that the logic is not completely symetric.
@ -87,7 +93,7 @@ impl EntryEncryptor for LegacySdaCompatible {
params: &EntryEncryptionParams,
plaintext: Vec<u8>,
) -> anyhow::Result<Vec<u8>, EntryEncryptionError> {
let key = get_encryption_key(&passkey.into(), &params.salt)?;
let key = Self::get_encryption_key(&passkey.into(), &params.salt)?;
let iv = base64::decode(&params.iv)?;
let cipher = Aes256Cbc::new_from_slices(&key, &iv)?;
@ -116,7 +122,7 @@ impl EntryEncryptor for LegacySdaCompatible {
params: &EntryEncryptionParams,
ciphertext: Vec<u8>,
) -> anyhow::Result<Vec<u8>, EntryEncryptionError> {
let key = get_encryption_key(&passkey.into(), &params.salt)?;
let key = Self::get_encryption_key(&passkey.into(), &params.salt)?;
let iv = base64::decode(&params.iv)?;
let cipher = Aes256Cbc::new_from_slices(&key, &iv)?;
@ -181,14 +187,16 @@ mod tests {
#[test]
fn test_encryption_key() {
assert_eq!(
get_encryption_key(&"password".into(), &"GMhL0N2hqXg=".into()).unwrap(),
LegacySdaCompatible::get_encryption_key(&"password".into(), &"GMhL0N2hqXg=".into())
.unwrap(),
base64::decode("KtiRa4/OxW83MlB6URf+Z8rAGj7CBY+pDlwD/NuVo6Y=")
.unwrap()
.as_slice()
);
assert_eq!(
get_encryption_key(&"password".into(), &"wTzTE9A6aN8=".into()).unwrap(),
LegacySdaCompatible::get_encryption_key(&"password".into(), &"wTzTE9A6aN8=".into())
.unwrap(),
base64::decode("Dqpej/3DqEat0roJaHmu3luYgDzRCUmzX94n4fqvWj8=")
.unwrap()
.as_slice()