pq/libfreemkv
1
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Drop six unused crates, and align the rest with the workspace

Browse Source 
Two problems, both invisible until the whole graph is looked at together.

DEAD: num-bigint, sha2, num-traits, num-integer, cmac and cbc are
declared here and referenced nowhere -- not in src, tests or benches.
They were being compiled, audited and offered version bumps forever for
no reason. Removing beats bumping.

cbc nearly survived the sweep: a substring search for "cbc" matches 44
occurrences of ycbcr_to_rgb in the DVD subtitle decoder, so it looked
used. Only a word-boundary search exposed it.

SKEW: this crate was the outlier on every shared dependency -- aes 0.8,
rand 0.8, base64 0.22.1 and zip 2 against 0.9 / 0.10 / 0.23 / 8
elsewhere. Cargo cannot unify across a major version, so it compiled
BOTH: 32 duplicated crates in the freemkv binary's graph, including two
complete AES implementations (aes 0.8 + 0.9, cipher 0.4 + 0.5), two
digest stacks and two getrandom. Two crypto stacks in one product is
worth removing on its own.

The aes bump is an API rename -- BlockCipher-prefixed traits, Array for
GenericArray -- and the obvious translation uses Array::from_slice,
which the new version deprecates and clippy's -D warnings would reject.
These use the From<[T; N]> conversion the crate points at instead.

3441 tests pass in debug and release. The AACS crypto here is covered by
known-answer tests, so a byte-order or sizing mistake in that rename
could not have passed.
This commit is contained in:
Matthew Jackson
2026-08-09 18:37:24 -07:00
parent b17761a24e
commit f434b9cf2c
5 changed files with 47 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/aacs/content.rs
+10 -6
View File
@@ -4,7 +4,7 @@
#[cfg(test)]
use aes::Aes128;
#[cfg(test)]
use aes::cipher::{KeyInit, generic_array::GenericArray};
use aes::cipher::{Array, KeyInit};
use super::crypto::{aes_cbc_decrypt, aes_cbc_encrypt, aes_ecb_encrypt};
// Only this module's test fixtures build CBC ciphertext by hand now — the
@@ -418,7 +418,7 @@ pub(crate) fn decrypt_bus(unit: &mut [u8], read_data_key: &[u8; 16]) {
mod tests {
use super::super::crypto::aes_ecb_decrypt;
use super::*;
use aes::cipher::BlockEncrypt; // test fixtures build ciphertext directly
use aes::cipher::BlockCipherEncrypt; // test fixtures build ciphertext directly
/// [`encrypt_unit`] is the exact inverse of [`decrypt_unit`]: whatever an
/// authoring caller encrypts, the read path must recover byte-for-byte.
@@ -725,7 +725,7 @@ mod tests {
}
// CBC encrypt bytes 16..6143
let cipher = Aes128::new(GenericArray::from_slice(&encrypt_key));
let cipher = Aes128::new(&encrypt_key.into());
let mut prev = AACS_IV;
let num_blocks = (ALIGNED_UNIT_LEN - 16) / 16;
for i in 0..num_blocks {
@@ -733,7 +733,9 @@ mod tests {
for j in 0..16 {
plain[off + j] ^= prev[j];
}
let mut block = GenericArray::clone_from_slice(&plain[off..off + 16]);
let mut chunk = [0u8; 16];
chunk.copy_from_slice(&plain[off..off + 16]);
let mut block: Array<u8, _> = chunk.into();
cipher.encrypt_block(&mut block);
plain[off..off + 16].copy_from_slice(&block);
prev.copy_from_slice(&plain[off..off + 16]);
@@ -1496,7 +1498,7 @@ mod tests {
let plain = unit.clone();
// Forward: CBC-encrypt unit[s+16 .. s+2048] per sector under AACS IV.
let cipher = Aes128::new(GenericArray::from_slice(&rdk));
let cipher = Aes128::new(&rdk.into());
for s in (0..ALIGNED_UNIT_LEN).step_by(SECTOR_BYTES) {
let mut prev = AACS_IV;
let body = s + 16;
@@ -1507,7 +1509,9 @@ mod tests {
for j in 0..16 {
unit[off + j] ^= prev[j];
}
let mut blk = GenericArray::clone_from_slice(&unit[off..off + 16]);
let mut chunk = [0u8; 16];
chunk.copy_from_slice(&unit[off..off + 16]);
let mut blk: Array<u8, _> = chunk.into();
cipher.encrypt_block(&mut blk);
unit[off..off + 16].copy_from_slice(&blk);
prev.copy_from_slice(&unit[off..off + 16]);
src/aacs/crypto.rs
+10 -8
View File
@@ -8,7 +8,7 @@
//! content / keys / variant modules.
use aes::Aes128;
use aes::cipher::{BlockDecrypt, BlockEncrypt, KeyInit, generic_array::GenericArray};
use aes::cipher::{Array, BlockCipherDecrypt, BlockCipherEncrypt, KeyInit};
/// Fixed IV used by AACS for all AES-CBC operations. [C] §2.1.2 (default CBC IV, `iv0`).
pub(crate) const AACS_IV: [u8; 16] = [
@@ -39,13 +39,13 @@ pub(crate) fn new_cipher_for(key: &[u8; 16]) -> Aes128 {
fn new_cipher(key: &[u8; 16]) -> Aes128 {
#[cfg(test)]
KEY_EXPANSIONS.with(|c| c.set(c.get() + 1));
Aes128::new(GenericArray::from_slice(key))
Aes128::new(&(*key).into())
}
/// AES-128-ECB encrypt a single 16-byte block. [C] §2.1.1 (`AES-128E`).
pub(crate) fn aes_ecb_encrypt(key: &[u8; 16], data: &[u8; 16]) -> [u8; 16] {
let cipher = Aes128::new(GenericArray::from_slice(key));
let mut block = GenericArray::clone_from_slice(data);
let cipher = Aes128::new(&(*key).into());
let mut block: Array<u8, _> = (*data).into();
cipher.encrypt_block(&mut block);
let mut out = [0u8; 16];
out.copy_from_slice(&block);
@@ -54,8 +54,8 @@ pub(crate) fn aes_ecb_encrypt(key: &[u8; 16], data: &[u8; 16]) -> [u8; 16] {
/// AES-128-ECB decrypt a single 16-byte block. [C] §2.1.1 (`AES-128D`).
pub(crate) fn aes_ecb_decrypt(key: &[u8; 16], data: &[u8; 16]) -> [u8; 16] {
let cipher = Aes128::new(GenericArray::from_slice(key));
let mut block = GenericArray::clone_from_slice(data);
let cipher = Aes128::new(&(*key).into());
let mut block: Array<u8, _> = (*data).into();
cipher.decrypt_block(&mut block);
let mut out = [0u8; 16];
out.copy_from_slice(&block);
@@ -88,7 +88,7 @@ pub(crate) fn aes_cbc_encrypt(key: &[u8; 16], data: &mut [u8]) {
for j in 0..16 {
block[j] = data[offset + j] ^ prev[j];
}
let mut ga = GenericArray::clone_from_slice(&block);
let mut ga: Array<u8, _> = block.into();
cipher.encrypt_block(&mut ga);
data[offset..offset + 16].copy_from_slice(&ga);
prev.copy_from_slice(&ga);
@@ -140,7 +140,9 @@ pub(crate) fn cbc_decrypt_blocks(cipher: &Aes128, data: &mut [u8]) {
p.copy_from_slice(&data[(i - 1) * 16..i * 16]);
p
};
let mut block = GenericArray::clone_from_slice(&data[offset..offset + 16]);
let mut chunk = [0u8; 16];
chunk.copy_from_slice(&data[offset..offset + 16]);
let mut block: Array<u8, _> = chunk.into();
cipher.decrypt_block(&mut block);
for j in 0..16 {
data[offset + j] = block[j] ^ prev[j];
src/disc/mod.rs
+5 -5
View File
@@ -5416,7 +5416,7 @@ mod tests {
use crate::aacs::content::ALIGNED_UNIT_LEN;
use crate::aacs::crypto::AACS_IV;
use aes::Aes128;
use aes::cipher::{BlockEncrypt, KeyInit, generic_array::GenericArray};
use aes::cipher::{Array, BlockCipherEncrypt, KeyInit};
let mut unit = clear[..ALIGNED_UNIT_LEN].to_vec();
// Flag the unit encrypted (CPI bits on byte 0) before key derivation so
// the recovered plaintext header matches and `decrypt_unit`'s CPI gate
@@ -5424,14 +5424,14 @@ mod tests {
unit[0] |= 0xC0;
let mut header = [0u8; 16];
header.copy_from_slice(&unit[..16]);
let cipher = Aes128::new(GenericArray::from_slice(uk));
let mut blk = GenericArray::clone_from_slice(&header);
let cipher = Aes128::new(&(*uk).into());
let mut blk: Array<u8, _> = header.into();
cipher.encrypt_block(&mut blk);
let mut dk = [0u8; 16];
for i in 0..16 {
dk[i] = blk[i] ^ header[i];
}
let bc = Aes128::new(GenericArray::from_slice(&dk));
let bc = Aes128::new(&dk.into());
let mut prev = AACS_IV;
let mut i = 16;
while i + 16 <= ALIGNED_UNIT_LEN {
@@ -5439,7 +5439,7 @@ mod tests {
for j in 0..16 {
b[j] = unit[i + j] ^ prev[j];
}
let mut g = GenericArray::clone_from_slice(&b);
let mut g: Array<u8, _> = b.into();
bc.encrypt_block(&mut g);
for j in 0..16 {
unit[i + j] = g[j];