go-afero-encfs/README.md

go-afero-encfs

go-afero-encfs is a afero encrypted fs implementation

In stage 1 we only encrypt file content, the file name is not encrypted.

In the future we are going to encrypt the file name also.

AES-CTR Introduction

AES-CTR algorithm is show as: https://git.hatter.ink/hatter/simple-rust-tests/src/branch/master/__crypto/aes_ctr_test/src/main.rs

Algorithm is shown as below:

let key = <Your AES encryption key>;
let iv = <Random 8 bytes>;

let plaintext = <Plaintext bytes>;
let ciphertext = <plaintext.len() bytes>;
let plaintext_block_count = ceil(plaintext / 16);

for counter in 0..plaintext_block_count {
    let iv_and_counter = iv + counter.to_be_bytes();
    let encrytped_iv_and_counter = aes_encrypt(key, iv_and_counter);

    for i in 0..encrytped_iv_and_counter {
        ciphertext[counter * 16 + i] = encrytped_iv_and_counter[i] ^ plaintext[counter * 16 + i];
    }
}

EncFile Spec

File ext *.__encfile:

{
    "iv": "<16 bytes IV in base64>"
}

if *.__encfile not found, then file is unencrypted.

Reference

Related projects:

• https://github.com/spf13/afero
• https://github.com/filebrowser/filebrowser