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</pre></div><pre class="rust"><code><span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="kw">use </span>libc::c_int;
<span class="kw">use </span>libc::c_uchar;
<span class="attr">#[allow(non_camel_case_types)]
#[repr(transparent)]
</span><span class="kw">struct </span>EVP_CIPHER_CTX {
_unused: <span class="kw-2">*mut </span>EVP_CIPHER_CTX,
}
<span class="attr">#[allow(non_camel_case_types)]
#[repr(transparent)]
</span><span class="kw">struct </span>OSSL_PARAM {
_unused: c_void,
}
<span class="kw">impl </span>Drop <span class="kw">for </span>EVP_CIPHER_CTX {
<span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="kw">unsafe </span>{ EVP_CIPHER_CTX_free(<span class="self">self</span>) }
}
}
<span class="kw">impl </span>Algorithm {
<span class="kw">pub fn </span>get_evp_aead(<span class="self">self</span>) -&gt; <span class="kw-2">*const </span>EVP_AEAD {
<span class="kw">match </span><span class="self">self </span>{
Algorithm::AES128_GCM =&gt; <span class="kw">unsafe </span>{ EVP_aes_128_gcm() },
Algorithm::AES256_GCM =&gt; <span class="kw">unsafe </span>{ EVP_aes_256_gcm() },
Algorithm::ChaCha20_Poly1305 =&gt; <span class="kw">unsafe </span>{ EVP_chacha20_poly1305() },
}
}
}
<span class="kw">impl </span>Open {
<span class="kw">pub fn </span>open_with_u64_counter(
<span class="kw-2">&amp;</span><span class="self">self</span>, counter: u64, ad: <span class="kw-2">&amp;</span>[u8], buf: <span class="kw-2">&amp;mut </span>[u8],
) -&gt; <span class="prelude-ty">Result</span>&lt;usize&gt; {
<span class="kw">if </span><span class="macro">cfg!</span>(feature = <span class="string">"fuzzing"</span>) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(buf.len());
}
<span class="kw">let </span>in_buf = buf.to_owned(); <span class="comment">// very inefficient
</span><span class="kw">let </span>tag_len = <span class="self">self</span>.alg().tag_len();
<span class="kw">let </span><span class="kw-2">mut </span>cipher_len = buf.len();
<span class="kw">let </span>nonce = make_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.packet.nonce, counter);
<span class="comment">// Set the IV len.
</span><span class="kw">const </span>EVP_CTRL_AEAD_SET_IVLEN: i32 = <span class="number">0x9</span>;
<span class="kw">let </span><span class="kw-2">mut </span>rc = <span class="kw">unsafe </span>{
EVP_CIPHER_CTX_ctrl(
<span class="self">self</span>.packet.ctx,
EVP_CTRL_AEAD_SET_IVLEN,
nonce.len() <span class="kw">as </span>i32,
std::ptr::null_mut(),
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
rc = <span class="kw">unsafe </span>{
EVP_CipherInit_ex2(
<span class="self">self</span>.packet.ctx,
std::ptr::null_mut(), <span class="comment">// already set
</span><span class="self">self</span>.packet.key.as_ptr(),
nonce[..].as_ptr(),
<span class="self">Self</span>::DECRYPT <span class="kw">as </span>i32,
std::ptr::null(),
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="kw">let </span><span class="kw-2">mut </span>olen: i32 = <span class="number">0</span>;
<span class="kw">if </span>!ad.is_empty() {
rc = <span class="kw">unsafe </span>{
EVP_CipherUpdate(
<span class="self">self</span>.packet.ctx,
std::ptr::null_mut(),
<span class="kw-2">&amp;mut </span>olen,
ad.as_ptr(),
ad.len() <span class="kw">as </span>i32,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
}
<span class="kw">if </span>cipher_len &lt; tag_len {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
cipher_len -= tag_len;
rc = <span class="kw">unsafe </span>{
EVP_CipherUpdate(
<span class="self">self</span>.packet.ctx,
buf.as_mut_ptr(),
<span class="kw-2">&amp;mut </span>olen,
in_buf.as_ptr(),
cipher_len <span class="kw">as </span>i32,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="kw">let </span>plaintext_len = olen <span class="kw">as </span>usize;
<span class="kw">const </span>EVP_CTRL_AEAD_SET_TAG: i32 = <span class="number">0x11</span>;
rc = <span class="kw">unsafe </span>{
EVP_CIPHER_CTX_ctrl(
<span class="self">self</span>.packet.ctx,
EVP_CTRL_AEAD_SET_TAG,
tag_len <span class="kw">as </span>i32,
buf[cipher_len..].as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>c_void,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
rc = <span class="kw">unsafe </span>{
EVP_CipherFinal_ex(
<span class="self">self</span>.packet.ctx,
buf[plaintext_len..].as_mut_ptr(),
<span class="kw-2">&amp;mut </span>olen,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="prelude-val">Ok</span>(plaintext_len + olen <span class="kw">as </span>usize)
}
}
<span class="kw">impl </span>Seal {
<span class="kw">pub fn </span>seal_with_u64_counter(
<span class="kw-2">&amp;</span><span class="self">self</span>, counter: u64, ad: <span class="kw-2">&amp;</span>[u8], buf: <span class="kw-2">&amp;mut </span>[u8], in_len: usize,
extra_in: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>[u8]&gt;,
) -&gt; <span class="prelude-ty">Result</span>&lt;usize&gt; {
<span class="kw">if </span><span class="macro">cfg!</span>(feature = <span class="string">"fuzzing"</span>) {
<span class="kw">if let </span><span class="prelude-val">Some</span>(extra) = extra_in {
buf[in_len..in_len + extra.len()].copy_from_slice(extra);
<span class="kw">return </span><span class="prelude-val">Ok</span>(in_len + extra.len());
}
<span class="kw">return </span><span class="prelude-val">Ok</span>(in_len);
}
<span class="comment">// very inefficient
</span><span class="kw">let </span>in_buf = buf.to_owned();
<span class="kw">let </span>nonce = make_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.packet.nonce, counter);
<span class="comment">// Set the IV len.
</span><span class="kw">const </span>EVP_CTRL_AEAD_SET_IVLEN: i32 = <span class="number">0x9</span>;
<span class="kw">let </span><span class="kw-2">mut </span>rc = <span class="kw">unsafe </span>{
EVP_CIPHER_CTX_ctrl(
<span class="self">self</span>.packet.ctx,
EVP_CTRL_AEAD_SET_IVLEN,
nonce.len() <span class="kw">as </span>i32,
std::ptr::null_mut(),
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
rc = <span class="kw">unsafe </span>{
EVP_CipherInit_ex2(
<span class="self">self</span>.packet.ctx,
std::ptr::null_mut(), <span class="comment">// already set
</span><span class="self">self</span>.packet.key.as_ptr(),
nonce[..].as_ptr(),
<span class="self">Self</span>::ENCRYPT <span class="kw">as </span>i32,
std::ptr::null(),
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="kw">let </span>tag_len = <span class="self">self</span>.alg().tag_len();
<span class="kw">let </span><span class="kw-2">mut </span>olen: i32 = <span class="number">0</span>;
<span class="kw">let </span><span class="kw-2">mut </span>rc;
<span class="kw">if </span>!ad.is_empty() {
rc = <span class="kw">unsafe </span>{
EVP_CipherUpdate(
<span class="self">self</span>.packet.ctx,
std::ptr::null_mut(),
<span class="kw-2">&amp;mut </span>olen,
ad.as_ptr(),
ad.len() <span class="kw">as </span>i32,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="comment">// We had AD but we couldn't set it.
</span><span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
}
<span class="kw">let </span><span class="kw-2">mut </span>ciphertext_len: usize = <span class="number">0</span>;
rc = <span class="kw">unsafe </span>{
EVP_CipherUpdate(
<span class="self">self</span>.packet.ctx,
buf.as_mut_ptr(),
<span class="kw-2">&amp;mut </span>olen,
in_buf.as_ptr(),
in_len <span class="kw">as </span>i32,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
};
ciphertext_len += olen <span class="kw">as </span>usize;
<span class="kw">let </span>len = olen <span class="kw">as </span>usize;
rc = <span class="kw">unsafe </span>{
EVP_CipherFinal_ex(
<span class="self">self</span>.packet.ctx,
buf[len..].as_mut_ptr(),
<span class="kw-2">&amp;mut </span>olen,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
ciphertext_len += olen <span class="kw">as </span>usize;
<span class="kw">const </span>EVP_CTRL_AEAD_GET_TAG: i32 = <span class="number">0x10</span>;
rc = <span class="kw">unsafe </span>{
EVP_CIPHER_CTX_ctrl(
<span class="self">self</span>.packet.ctx,
EVP_CTRL_AEAD_GET_TAG,
tag_len <span class="kw">as </span>i32,
buf[ciphertext_len..].as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>c_void,
)
};
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="prelude-val">Ok</span>(in_len + tag_len)
}
}
<span class="kw">fn </span>make_evp_cipher_ctx_basic(
alg: Algorithm, enc: u32,
) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="kw-2">*mut </span>EVP_CIPHER_CTX&gt; {
<span class="kw">let </span>ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX = <span class="kw">unsafe </span>{
<span class="kw">let </span>cipher: <span class="kw-2">*const </span>EVP_AEAD = alg.get_evp_aead();
<span class="kw">let </span>ctx = EVP_CIPHER_CTX_new();
<span class="kw">if </span>ctx.is_null() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
<span class="kw">let </span>rc = EVP_CipherInit_ex2(
ctx,
cipher,
std::ptr::null_mut(),
std::ptr::null_mut(),
enc <span class="kw">as </span>c_int, <span class="comment">// Following calls can use -1 once this is set.
</span>std::ptr::null(),
);
<span class="kw">if </span>rc != <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::CryptoFail);
}
ctx
};
<span class="prelude-val">Ok</span>(ctx)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>PacketKey {
ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX,
nonce: Vec&lt;u8&gt;,
<span class="comment">// Note: We'd need the key for later use as it is needed by the openssl API.
// TODO: check if we can avoid this and get the key when needed and not
// have it stored here.
</span>key: Vec&lt;u8&gt;,
}
<span class="kw">impl </span>PacketKey {
<span class="kw">pub fn </span>new(
algo: Algorithm, key: Vec&lt;u8&gt;, iv: Vec&lt;u8&gt;, enc: u32,
) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{
ctx: make_evp_cipher_ctx_basic(algo, enc)<span class="question-mark">?</span>,
nonce: iv,
key,
})
}
<span class="kw">pub fn </span>from_secret(aead: Algorithm, secret: <span class="kw-2">&amp;</span>[u8], enc: u32) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
<span class="kw">let </span>key_len = aead.key_len();
<span class="kw">let </span>nonce_len = aead.nonce_len();
<span class="kw">let </span><span class="kw-2">mut </span>key = <span class="macro">vec!</span>[<span class="number">0</span>; key_len];
<span class="kw">let </span><span class="kw-2">mut </span>iv = <span class="macro">vec!</span>[<span class="number">0</span>; nonce_len];
derive_pkt_key(aead, secret, <span class="kw-2">&amp;mut </span>key)<span class="question-mark">?</span>;
derive_pkt_iv(aead, secret, <span class="kw-2">&amp;mut </span>iv)<span class="question-mark">?</span>;
<span class="self">Self</span>::new(aead, key, iv, enc)
}
}
<span class="kw">unsafe impl </span>std::marker::Send <span class="kw">for </span>PacketKey {}
<span class="kw">unsafe impl </span>std::marker::Sync <span class="kw">for </span>PacketKey {}
<span class="kw">extern </span>{
<span class="comment">// EVP
</span><span class="kw">fn </span>EVP_aes_128_gcm() -&gt; <span class="kw-2">*const </span>EVP_AEAD;
<span class="kw">fn </span>EVP_aes_256_gcm() -&gt; <span class="kw-2">*const </span>EVP_AEAD;
<span class="kw">fn </span>EVP_chacha20_poly1305() -&gt; <span class="kw-2">*const </span>EVP_AEAD;
<span class="comment">// EVP_CIPHER_CTX
</span><span class="kw">fn </span>EVP_CIPHER_CTX_new() -&gt; <span class="kw-2">*mut </span>EVP_CIPHER_CTX;
<span class="kw">fn </span>EVP_CIPHER_CTX_free(ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX);
<span class="kw">fn </span>EVP_CipherInit_ex2(
ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX, cipher: <span class="kw-2">*const </span>EVP_AEAD, key: <span class="kw-2">*const </span>c_uchar,
iv: <span class="kw-2">*const </span>c_uchar, enc: c_int, params: <span class="kw-2">*const </span>OSSL_PARAM,
) -&gt; c_int;
<span class="kw">fn </span>EVP_CIPHER_CTX_ctrl(
ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX, type_: i32, arg: i32, ptr: <span class="kw-2">*mut </span>c_void,
) -&gt; c_int;
<span class="kw">fn </span>EVP_CipherUpdate(
ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX, out: <span class="kw-2">*mut </span>c_uchar, outl: <span class="kw-2">*mut </span>c_int,
in_: <span class="kw-2">*const </span>c_uchar, inl: i32,
) -&gt; c_int;
<span class="kw">fn </span>EVP_CipherFinal_ex(
ctx: <span class="kw-2">*mut </span>EVP_CIPHER_CTX, out: <span class="kw-2">*mut </span>c_uchar, outl: <span class="kw-2">*mut </span>c_int,
) -&gt; c_int;
}
</code></pre></div></section></main></body></html>