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src/backup/crypt_setup.rs: only use compressed data if it is shorter than uncompressed

This commit is contained in:
Dietmar Maurer 2019-06-13 12:47:54 +02:00
parent f98ac774ee
commit 68ab376ae9
1 changed files with 22 additions and 32 deletions
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54
src/backup/crypt_setup.rs
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@ -11,7 +11,7 @@ use proxmox::tools;
use openssl::pkcs5::{pbkdf2_hmac, scrypt};
use openssl::hash::MessageDigest;
use openssl::symm::{decrypt_aead, Cipher, Crypter, Mode};
use std::io::{Read, Write};
use std::io::Write;
/// Encryption Configuration with secret key
///
@ -99,47 +99,37 @@ impl CryptConfig {
let mut c = Crypter::new(self.cipher, Mode::Encrypt, &self.enc_key, Some(&iv))?;
c.aad_update(b"")?; //??
let mut enc_data = if compress {
if compress {
let compr_data = zstd::block::compress(data, 1)?;
// Note: We only use compression if result is shorter
if compr_data.len() < data.len() {
let mut enc = vec![0; compr_data.len()+40+self.cipher.block_size()];
let mut enc = Vec::with_capacity(data.len()+40+self.cipher.block_size());
enc[0..8].copy_from_slice(&super::ENCR_COMPR_CHUNK_MAGIC_1_0);
enc[8..24].copy_from_slice(&iv);
enc.write_all(&super::ENCR_COMPR_CHUNK_MAGIC_1_0)?;
let count = c.update(&compr_data, &mut enc[40..])?;
let rest = c.finalize(&mut enc[(40+count)..])?;
enc.truncate(40 + count + rest);
enc.write_all(&iv)?;
enc.write_all(&[0u8;16])?; // dummy tag, update later
c.get_tag(&mut enc[24..40])?;
const BUFFER_SIZE: usize = 32*1024;
let mut comp_buf = [0u8; BUFFER_SIZE];
let mut encr_buf = [0u8; BUFFER_SIZE];
let mut zstream = zstd::stream::read::Encoder::new(data, 1)?;
loop {
let bytes = zstream.read(&mut comp_buf)?;
if bytes == 0 { break; }
let count = c.update(&comp_buf[..bytes], &mut encr_buf)?;
enc.write_all(&encr_buf[..count])?;
return Ok(enc)
}
let rest = c.finalize(&mut encr_buf)?;
if rest > 0 { enc.write_all(&encr_buf[..rest])?; }
enc
} else {
}
let mut enc = vec![0; data.len()+40+self.cipher.block_size()];
let mut enc = vec![0; data.len()+40+self.cipher.block_size()];
enc[0..8].copy_from_slice(&super::ENCRYPTED_CHUNK_MAGIC_1_0);
enc[8..24].copy_from_slice(&iv);
enc[0..8].copy_from_slice(&super::ENCRYPTED_CHUNK_MAGIC_1_0);
enc[8..24].copy_from_slice(&iv);
let count = c.update(data, &mut enc[40..])?;
let rest = c.finalize(&mut enc[(40+count)..])?;
enc.truncate(40 + count + rest);
enc
};
let count = c.update(data, &mut enc[40..])?;
let rest = c.finalize(&mut enc[(40+count)..])?;
enc.truncate(40 + count + rest);
c.get_tag(&mut enc_data[24..40])?;
c.get_tag(&mut enc[24..40])?;
Ok(enc_data)
Ok(enc)
}
/// Decompress and decrypt chunk, verify MAC.