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feat: encryptor performance updated

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Hatter Jiang
2023-09-01 23:50:15 +08:00
parent 0ad4e5ce28
commit aab2c97eaa
6 changed files with 83 additions and 105 deletions
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136
src/encryptor.rs
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@@ -1,9 +1,11 @@
use aes::{Aes128, Aes192, Aes256};
use aes::cipher::{Block, BlockEncrypt, KeyInit};
use aes::cipher::generic_array::GenericArray;
use zeroize::ZeroizeOnDrop;
use ghash::GHash;
use ghash::universal_hash::UniversalHash;
use zeroize::Zeroize;
use crate::util::{gmul_128, inc_32, msb_s, normalize_nonce, u8to128};
use crate::util::{AesBlock, BLOCK_SIZE, inc_32, msb_s, normalize_nonce, u8to128};
macro_rules! define_aes_gcm_stream_encryptor_impl {
(
@@ -11,14 +13,10 @@ macro_rules! define_aes_gcm_stream_encryptor_impl {
$aesn:tt,
$key_size:tt
) => {
#[derive(ZeroizeOnDrop)]
pub struct $module {
crypto: $aesn,
cipher: $aesn,
message_buffer: Vec<u8>,
integrality_buffer: Vec<u8>,
ghash_key: u128,
ghash_val: u128,
ghash: GHash,
init_nonce: u128,
encryption_nonce: u128,
adata_len: usize,
@@ -30,128 +28,106 @@ impl $module {
let key = GenericArray::from(key);
let aes = $aesn::new(&key);
let mut ghash_key = ghash::Key::default();
aes.encrypt_block(&mut ghash_key);
let ghash = GHash::new(&ghash_key);
ghash_key.zeroize();
let mut s = Self {
crypto: aes,
cipher: aes,
message_buffer: vec![],
integrality_buffer: vec![],
ghash_key: 0,
ghash_val: 0,
ghash,
init_nonce: 0,
encryption_nonce: 0,
adata_len: 0,
message_len: 0,
};
let (ghash_key, normalized_nonce) = s.normalize_nonce(nonce);
s.ghash_key = ghash_key;
let (_, normalized_nonce) = s.normalize_nonce(nonce);
s.init_nonce = normalized_nonce;
s.encryption_nonce = normalized_nonce;
s
}
pub fn init_adata(&mut self, adata: &[u8]) {
self.integrality_buffer.extend_from_slice(adata);
self.adata_len += adata.len();
let adata_bit_len = self.adata_len * 8;
let v = 128 * ((adata_bit_len + 128 - 1) / 128) - adata_bit_len;
self.integrality_buffer.extend_from_slice(&vec![0x00; v / 8]);
if adata.len() > 0 {
self.adata_len += adata.len();
self.ghash.update_padded(adata);
}
}
pub fn update(&mut self, bytes: &[u8]) -> Vec<u8> {
self.message_buffer.extend_from_slice(bytes);
pub fn update(&mut self, message: &[u8]) -> Vec<u8> {
self.message_buffer.extend_from_slice(message);
let message_buffer_slice = self.message_buffer.as_slice();
let message_buffer_len = message_buffer_slice.len();
if message_buffer_len < 16 {
if message_buffer_slice.len() < BLOCK_SIZE {
return Vec::with_capacity(0);
}
let blocks_count = message_buffer_len / 16;
let mut encrypted_message = Vec::with_capacity(blocks_count * 16);
let blocks_count = message_buffer_slice.len() / BLOCK_SIZE;
let mut blocks = Vec::with_capacity(blocks_count);
for _ in 0..blocks_count {
self.encryption_nonce = inc_32(self.encryption_nonce);
let ctr = self.encryption_nonce.to_be_bytes();
let block = Block::<$aesn>::clone_from_slice(&ctr);
blocks.push(block);
blocks.push(Block::<AesBlock>::clone_from_slice(&ctr));
}
// println!("block site: {}", blocks.len());
self.crypto.encrypt_blocks(&mut blocks);
for i in 0..blocks_count {
// self.encryption_nonce = inc_32(self.encryption_nonce);
// let mut ctr = self.encryption_nonce.to_be_bytes();
// let block = Block::<$aesn>::from_mut_slice(&mut ctr);
// self.crypto.encrypt_block(block);
let block = &blocks[i];
let chunk = &message_buffer_slice[i * 16..(i + 1) * 16];
let y = u8to128(chunk) ^ u8to128(&block.as_slice());
encrypted_message.extend_from_slice(&y.to_be_bytes());
}
self.message_buffer = message_buffer_slice[blocks_count * 16..].to_vec();
self.integrality_buffer.extend_from_slice(&encrypted_message);
self.message_len += encrypted_message.len();
self.cipher.encrypt_blocks(&mut blocks);
self.update_integrality_buffer();
let mut encrypted_message = message_buffer_slice[0..blocks_count * BLOCK_SIZE].to_vec();
for i in 0..blocks_count {
let chunk = &mut encrypted_message[i * BLOCK_SIZE..(i + 1) * BLOCK_SIZE];
let block = blocks[i].as_slice();
for k in 0..BLOCK_SIZE {
chunk[k] ^= block[k];
}
}
self.ghash.update_padded(&encrypted_message);
self.message_buffer = message_buffer_slice[blocks_count * BLOCK_SIZE..].to_vec();
self.message_len += encrypted_message.len();
encrypted_message
}
pub fn finalize(&mut self) -> (Vec<u8>, Vec<u8>) {
let mut encrypted_message = Vec::with_capacity(16);
let mut final_encrypted_message = Vec::with_capacity(BLOCK_SIZE);
if !self.message_buffer.is_empty() {
// last block and this block len is less than 128 bits
// last block and this block len may less than 128 bits (16 bytes)
self.encryption_nonce = inc_32(self.encryption_nonce);
let mut ctr = self.encryption_nonce.to_be_bytes();
let block = Block::<$aesn>::from_mut_slice(&mut ctr);
self.crypto.encrypt_block(block);
let block = Block::<AesBlock>::from_mut_slice(&mut ctr);
self.cipher.encrypt_block(block);
let chunk = self.message_buffer.as_slice();
let msb = msb_s(chunk.len() * 8, block.as_slice());
let y = u8to128(chunk) ^ u8to128(&msb);
encrypted_message.extend_from_slice(&y.to_be_bytes()[16 - chunk.len()..16]);
self.integrality_buffer.extend_from_slice(&encrypted_message);
self.message_len += encrypted_message.len();
final_encrypted_message.extend_from_slice(&y.to_be_bytes()[16 - chunk.len()..16]);
self.ghash.update_padded(&final_encrypted_message);
self.message_len += final_encrypted_message.len();
}
let adata_bit_len = self.adata_len * 8;
let message_bit_len = self.message_len * 8;
let u = 128 * ((message_bit_len + 128 - 1) / 128) - message_bit_len;
self.integrality_buffer.extend_from_slice(&vec![0x00; u / 8]);
self.integrality_buffer.extend_from_slice(&(adata_bit_len as u64).to_be_bytes());
self.integrality_buffer.extend_from_slice(&(message_bit_len as u64).to_be_bytes());
let mut adata_and_message_len = Vec::with_capacity(BLOCK_SIZE);
adata_and_message_len.extend_from_slice(&(adata_bit_len as u64).to_be_bytes());
adata_and_message_len.extend_from_slice(&(message_bit_len as u64).to_be_bytes());
self.ghash.update_padded(&adata_and_message_len);
self.update_integrality_buffer();
assert!(self.integrality_buffer.is_empty());
let tag = self.calculate_tag();
let tag = self.compute_tag();
(encrypted_message, tag)
(final_encrypted_message, tag)
}
fn calculate_tag(&mut self) -> Vec<u8> {
fn compute_tag(&mut self) -> Vec<u8> {
let mut bs = self.init_nonce.to_be_bytes().clone();
let block = Block::<$aesn>::from_mut_slice(&mut bs);
self.crypto.encrypt_block(block);
let tag_trunk = self.ghash_val.to_be_bytes();
let block = Block::<AesBlock>::from_mut_slice(&mut bs);
self.cipher.encrypt_block(block);
let ghash = self.ghash.clone().finalize();
let tag_trunk = ghash.as_slice();
let y = u8to128(&tag_trunk) ^ u8to128(&block.as_slice());
y.to_be_bytes().to_vec()
}
fn update_integrality_buffer(&mut self) {
// self.integrality_buffer.clear();
let integrality_buffer_slice = self.integrality_buffer.as_slice();
let integrality_buffer_slice_len = integrality_buffer_slice.len();
if integrality_buffer_slice_len >= 16 {
let blocks_count = integrality_buffer_slice_len / 16;
for i in 0..blocks_count {
let buf = &integrality_buffer_slice[i * 16..(i + 1) * 16];
self.ghash_val = gmul_128(self.ghash_val ^ u8to128(buf), self.ghash_key)
}
self.integrality_buffer = integrality_buffer_slice[blocks_count * 16..].to_vec();
}
}
fn ghash_key(&mut self) -> u128 {
let mut block = [0u8; 16];
let block = Block::<$aesn>::from_mut_slice(&mut block);
self.crypto.encrypt_block(block);
let mut block = [0u8; BLOCK_SIZE];
let block = Block::<AesBlock>::from_mut_slice(&mut block);
self.cipher.encrypt_block(block);
u8to128(&block.as_slice())
}