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Add documentation for ContentEnc

This commit is contained in:
oupson 2022-10-06 17:00:50 +02:00
parent 86eba12b5a
commit 53ece0c257
Signed by: oupson
GPG Key ID: 3BD88615552EFCB7
1 changed files with 7 additions and 1 deletions
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8
rustcryptfs-lib/src/content_enc.rs
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@ -1,17 +1,21 @@
//! Utilities for file encryption.
use aes_gcm::{aead::generic_array::GenericArray, aes::Aes256, AeadInPlace, AesGcm, NewAead};
use cipher::consts::{U16, U32};
use hkdf::Hkdf;
use crate::error::{Result, DecryptError};
use crate::error::{DecryptError, Result};
type Aes256Gcm = AesGcm<Aes256, U16>;
/// ContentEnc implement all methods related to file encryption.
pub struct ContentEnc {
key: GenericArray<u8, U32>,
iv_len: usize,
}
impl ContentEnc {
/// Init a new ContentEnc from the master key and the iv len.
pub fn new(master_key: &[u8], iv_len: u8) -> Self {
let mut key = [0u8; 32];
let hdkf = Hkdf::<sha2::Sha256>::new(None, &master_key);
@ -24,6 +28,7 @@ impl ContentEnc {
}
}
/// Decrypt a encrypted block of len (iv_len + decrypted_block_size + iv_len), with the block number and the file id.
pub fn decrypt_block(
&self,
block: &[u8],
@ -70,6 +75,7 @@ impl ContentEnc {
return Ok(buf.to_vec());
}
/// Return the decrypted size of a file, based on the encrypted size.
pub fn get_real_size(encrypted_size: u64) -> u64 {
if encrypted_size == 0 {
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