SMusatov
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dim
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">aes_gcm::aead::generic_array::GenericArray</span>;
<span class="kw">use</span> <span class="ident">aes_gcm::aead::Aead</span>;
<span class="kw">use</span> <span class="ident">aes_gcm::AeadInPlace</span>;
<span class="kw">use</span> <span class="ident">aes_gcm::Aes256Gcm</span>;
<span class="kw">use</span> <span class="ident">aes_gcm::NewAead</span>;

<span class="kw">use</span> <span class="ident">displaydoc::Display</span>;
<span class="kw">use</span> <span class="ident">once_cell::sync::OnceCell</span>;
<span class="kw">use</span> <span class="ident">rand::Rng</span>;
<span class="kw">use</span> <span class="ident">rand::RngCore</span>;
<span class="kw">use</span> <span class="ident">serde::Serialize</span>;
<span class="kw">use</span> <span class="ident">std::convert::TryInto</span>;
<span class="kw">use</span> <span class="ident">thiserror::Error</span>;

<span class="kw">const</span> <span class="ident">NONCE_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">12</span>;
<span class="kw">const</span> <span class="ident">TAG_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">16</span>;

<span class="doccomment">/// This is the secret key with which we sign the cookies.</span>
<span class="comment">// TODO: Generate this at first run to ensure security</span>
<span class="kw">static</span> <span class="ident">KEY</span>: <span class="ident">OnceCell</span><span class="op">&lt;</span>[<span class="ident">u8</span>; <span class="number">32</span>]<span class="op">&gt;</span> <span class="op">=</span> <span class="ident">OnceCell::new</span>();

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">generate_key</span>() -&gt; [<span class="ident">u8</span>; <span class="number">32</span>] {
    <span class="ident">rand::thread_rng</span>().<span class="ident">gen</span>()
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_key</span>(<span class="ident">k</span>: [<span class="ident">u8</span>; <span class="number">32</span>]) {
    <span class="ident">KEY</span>.<span class="ident">set</span>(<span class="ident">k</span>).<span class="ident">expect</span>(<span class="string">&quot;Failed to set secret_key&quot;</span>)
}

<span class="doccomment">/// This function should only be called from tests</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_key_fallible</span>(<span class="ident">k</span>: [<span class="ident">u8</span>; <span class="number">32</span>]) {
    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">KEY</span>.<span class="ident">set</span>(<span class="ident">k</span>);
}

<span class="kw">fn</span> <span class="ident">get_key</span>() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="ident">u8</span>; <span class="number">32</span>] {
    <span class="ident">KEY</span>.<span class="ident">get</span>().<span class="ident">expect</span>(<span class="string">&quot;key must be initialized&quot;</span>)
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Display</span>, <span class="ident">Error</span>, <span class="ident">Serialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">AuthError</span> {
    <span class="doccomment">/// Token is not base64 encoded.</span>
    <span class="ident">BadBase64</span>,
    <span class="doccomment">/// Token data is too short.</span>
    <span class="ident">ShortData</span>,
    <span class="doccomment">/// Failed to decrypt token.</span>
    <span class="ident">DecryptError</span>,
    <span class="doccomment">/// Token plaintext does not contain a UserID.</span>
    <span class="ident">PlainTextNoti64</span>,
}

<span class="doccomment">/// Function encrypts a UserID with a nonce and returns it as a base64 string to be used as a cookie/token.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">user_cookie_generate</span>(<span class="ident">user</span>: <span class="ident">i64</span>) -&gt; <span class="ident">String</span> {
    <span class="comment">// Create a vec to hold the [nonce | cookie value].</span>
    <span class="kw">let</span> <span class="ident">cookie_val</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">user</span>.<span class="ident">to_be_bytes</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="number">0</span>; <span class="ident">NONCE_LEN</span> <span class="op">+</span> <span class="ident">cookie_val</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="ident">TAG_LEN</span>];

    <span class="comment">// Split data into three: nonce, input/output, tag. Copy input.</span>
    <span class="kw">let</span> (<span class="ident">nonce</span>, <span class="ident">in_out</span>) <span class="op">=</span> <span class="ident">data</span>.<span class="ident">split_at_mut</span>(<span class="ident">NONCE_LEN</span>);
    <span class="kw">let</span> (<span class="ident">in_out</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">in_out</span>.<span class="ident">split_at_mut</span>(<span class="ident">cookie_val</span>.<span class="ident">len</span>());
    <span class="ident">in_out</span>.<span class="ident">copy_from_slice</span>(<span class="ident">cookie_val</span>);

    <span class="comment">// Fill nonce piece with random data.</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">rand::thread_rng</span>();
    <span class="ident">rng</span>.<span class="ident">try_fill_bytes</span>(<span class="ident">nonce</span>)
        .<span class="ident">expect</span>(<span class="string">&quot;couldn&#39;t random fill nonce&quot;</span>);
    <span class="kw">let</span> <span class="ident">nonce</span> <span class="op">=</span> <span class="ident">GenericArray::clone_from_slice</span>(<span class="ident">nonce</span>);

    <span class="comment">// Perform the actual sealing operation, using the cookie&#39;s name as</span>
    <span class="comment">// associated data to prevent value swapping.</span>
    <span class="kw">let</span> <span class="ident">aead</span> <span class="op">=</span> <span class="ident">Aes256Gcm::new</span>(<span class="ident">GenericArray::from_slice</span>(<span class="ident">get_key</span>()));
    <span class="kw">let</span> <span class="ident">aad_tag</span> <span class="op">=</span> <span class="ident">aead</span>
        .<span class="ident">encrypt_in_place_detached</span>(<span class="kw-2">&amp;</span><span class="ident">nonce</span>, <span class="string">b&quot;&quot;</span>, <span class="ident">in_out</span>)
        .<span class="ident">expect</span>(<span class="string">&quot;encryption failure!&quot;</span>);

    <span class="comment">// Copy the tag into the tag piece.</span>
    <span class="ident">tag</span>.<span class="ident">copy_from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">aad_tag</span>);

    <span class="comment">// Base64 encode [nonce | encrypted value | tag].</span>
    <span class="ident">base64::encode</span>(<span class="kw-2">&amp;</span><span class="ident">data</span>)
}

<span class="doccomment">/// Function decrypts a UserID which was encrypted with `user_cookie_generate`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">user_cookie_decode</span>(<span class="ident">cookie</span>: <span class="ident">String</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">i64</span>, <span class="ident">AuthError</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">base64::decode</span>(<span class="ident">cookie</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">AuthError::BadBase64</span>)<span class="question-mark">?</span>;
    <span class="kw">if</span> <span class="ident">data</span>.<span class="ident">len</span>() <span class="op">&lt;</span><span class="op">=</span> <span class="ident">NONCE_LEN</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">AuthError::ShortData</span>);
    }
    <span class="kw">let</span> (<span class="ident">nonce</span>, <span class="ident">cipher</span>) <span class="op">=</span> <span class="ident">data</span>.<span class="ident">split_at</span>(<span class="ident">NONCE_LEN</span>);
    <span class="kw">let</span> <span class="ident">aead</span> <span class="op">=</span> <span class="ident">Aes256Gcm::new</span>(<span class="ident">GenericArray::from_slice</span>(<span class="ident">get_key</span>()));
    <span class="kw">let</span> <span class="ident">plaintext</span> <span class="op">=</span> <span class="ident">aead</span>
        .<span class="ident">decrypt</span>(<span class="ident">GenericArray::from_slice</span>(<span class="ident">nonce</span>), <span class="ident">cipher</span>)
        .<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">AuthError::DecryptError</span>)<span class="question-mark">?</span>;

    <span class="prelude-val">Ok</span>(<span class="ident">i64::from_be_bytes</span>(
        <span class="ident">plaintext</span>
            .<span class="ident">try_into</span>()
            .<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">AuthError::PlainTextNoti64</span>)<span class="question-mark">?</span>,
    ))
}
</code></pre></div>
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