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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>Botan - Your C++ Crypto Library of Choice</title>
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<body>
<div class="reveal">
<div class="slides">
<section>
<h1>Botan</h1>
<h3>Your C++ Crypto Library Of Choice</h3>
<p>
<small>Slides by <a href="http://twitter.com/securitykernel">@securitykernel</a></small>
</p>
</section>
<section>
<h2>Japanese for "peony"</h2>
<img src="img/peony.jpg" width="70%" height="70%" alt="Source: Wikipedia"/>
</section>
<section>
<ul>
<li>C++11</li>
<li>First release 2001</li>
<li>License: Simplified BSD</li>
<li>Handbook, Doxygen API doc</li>
<li>Self-contained, no dependencies</li>
<li>Development on GitHub</li>
<li>1 Maintainer, several contributors (including me :))</li>
</ul>
</section>
<section>
<h2>2 Branches</h2>
<ul>
<li>Stable (1.10)</li>
<ul>
<li>C++98</li>
</ul>
<li>Development (1.11)</li>
<ul>
<li>API changes possible</li>
<li>C++11 compiler required</li>
<li>Monthly releases</li>
<li>Will eventually become 2.0</li>
</ul>
</ul>
</section>
<section>
<section>
<h2>Features</h2>
</section>
<section>
<h2>Block Ciphers</h2>
<p>e.g., AES-GCM, ChaCha20Poly1305</p>
</section>
<section>
<h2>TLS/PKI</h2>
<ul>
<li>TLS/DTLS 1.0-1.2</li>
<li>X.509v3 certs and CRLs</li>
<li>PKIX cert path validation</li>
<li>OCSP</li>
<li>PKCS#10 CSRs</li>
</ul>
</section>
<section>
<h2>Public Key Crypto</h2>
<ul>
<li>e.g., RSA and ECC (NIST, Brainpool, Curve25519)</li>
<li>QC-resistant McEliece KEM</li>
<li>QC-resistant Merkle signatures (coming soon)</li>
</ul>
</section>
<section>
<h2>Other</h2>
<ul>
<li>Hash functions: e.g., SHA-1, SHA-2, SHA-3</li>
<li>KDFs: e.g., PBKDF2</li>
<li>Password hashing: e.g., bcrypt, passhash9 (PBKDF-based)</li>
<li>TPM 1.2, PKCS#11 support</li>
</ul>
</section>
</section>
<section>
<h2>Platforms</h2>
<ul>
<p>AIX, Android, Cygwin, Darwin (iOS/macOS),
<p>BSD, Haiku, HP-UX, Hurd, IRIX, Linux, Mingw,
<p>QNX, Solaris, Windows</p>
</ul>
</section>
<section>
<h2>Bindings</h2>
<ul>
<li>C89</li>
<li>Python</li>
<li>OCaml</li>
<li>Node.js</li>
</ul>
</section>
<section>
<h2>Design</h2>
<ul>
<li>Divided into modules, e.g., AES, ECDSA, TLS</li>
<li>Well-defined interfaces, e.g., <i>BlockCipher</i>, <i>HashFunction</i></li>
<li>3 Components:</li>
<ul>
<li>Library</li>
<li>CLI</li>
<li>Testsuite (82% coverage)</li>
</ul>
<li>Engine-like concept ("providers"), e.g., OpenSSL</li>
</ul>
</section>
<section>
<section>
<h2>Providers</h2>
<ul>
<li>Idea: Provide alternative implementations of certain algorithms</li>
<li>Choose implementation variant at runtime</li>
<li>Available providers choosen during configure, compiled in</li>
<li>"base" provider (default): Botan's software implementation</li>
<li>Priority of providers compile-time configurable</li>
</ul>
</section>
<section>
<h2>Available Providers</h2>
<ul>
<li>OpenSSL: block ciphers, ECDSA, hash functions, RC4, RSA</li>
<li>PKCS11: ECDH, ECDSA, RNG, RSA, X.509</li>
<li>TPM (WIP)</li>
</ul>
<pre><code class="cpp">
// sign and verify using openssl provider
Botan::AutoSeeded_RNG rng;
Botan::RSA_PrivateKey key(rng, 2048);
Botan::secure_vector<uint8_t> in { 0x01, 0x02, 0x03 };
Botan::PK_Signer signer(key, "EMSA4(SHA-256)",
Botan::IEEE_1363, "openssl");
std::vector<uint8_t> sig = signer.sign_message(in, rng);
Botan::PK_Verifier verifier(key, "EMSA4(SHA-256)",
Botan::IEEE_1363, "openssl");
bool ok = verifier.verify_message(in, sig);
</code></pre>
</section>
</section>
<section>
<h2>Random Number Generation</h2>
<ul>
<li>HMAC_RNG (RFC 5869 variant), HMAC_DRBG (NIST), System_RNG</li>
<li>AutoSeeded_RNG (HMAC_DRBG, automatically seeded)</li>
<li>Entropy sources:</li>
<ul>
<li>/dev/random / CryptGenRandom</li>
<li>Timestamp (highres)</li>
<li>rdrand</li>
<li>rdseed</li>
<li>Can feed arbitrary additional entropy</li>
</ul>
<li>Pass RandomNumberGenerator& whenever random numbers needed</li>
</section>
<section>
<h2>Building</h2>
<pre><code class="bash">
./configure.py --help
./configure.py [--enable-modules=] [--disable-modules=]
[--with-openssl] ...
make
./botan-test
# Tests all ok
./botan
</code></pre>
</section>
<section>
<section>
<h2>Examples</h2>
</section>
<section>
<h2>ECDSA sign</h2>
<pre><code class="cpp">
Botan::AutoSeeded_RNG rng;
Botan::ECDSA_PrivateKey key(rng, Botan::EC_Group("brainpool512r1"));
Botan::secure_vector<Botan::byte> in { 0x01, 0x02, 0x03 };
Botan::PK_Signer signer(key, "EMSA1(SHA-256)", Botan::IEEE_1363);
std::vector<Botan::byte> sig = signer.sign_message(in, rng);
Botan::PK_Verifier verifier(key, "EMSA1(SHA-256)", Botan::IEEE_1363);
bool ok = verifier.verify_message(in, sig);
</code></pre>
</section>
<section>
<h2>AES encrypt</h2>
<pre><code class="cpp">
std::unique_ptr<Botan::AEAD_Mode> enc(
Botan::get_aead("AES-256/GCM", Botan::ENCRYPTION));
Botan::AutoSeeded_RNG rng;
Botan::secure_vector<uint8_t> key = rng.random_vec(32);
Botan::secure_vector<uint8_t> nonce = rng.random_vec(32);
enc->set_key(key);
//enc->set_associated_data_vec(ad);
enc->start(nonce);
Botan::secure_vector<uint8_t> buf(32, 0xFE);
enc->finish(buf); // encrypts in-place
</code></pre>
</section>
<section>
<h2>SHA-256</h2>
<pre><code class="cpp">
std::unique_ptr<Botan::HashFunction> sha256(
Botan::HashFunction::create("SHA-256"));
sha256->update("123");
sha256->update("456");
Botan::secure_vector<uint8_t> digest = sha256->final();
</code></pre>
</section>
<section>
<h2>More Examples?</h2>
<ul>
<li>https://botan.randombit.net/manual/</li>
<li><i>src/tests/*</i></li>
</ul>
</section>
</section>
<section>
<h2>Botan vs. Crypto++</h2>
<table>
<tr>
<td>Practical interfaces</td>
<td>Academic interfaces</td>
</tr>
<tr>
<td>TLS</td>
<td>No TLS</td>
</tr>
<tr>
<td>X.509</td>
<td>No X.509</td>
</tr>
<tr>
<td>PKCS#11, TPM support</td>
<td>No HSM support</td>
</tr>
<tr>
<td>Provider concept</td>
<td>No such thing</td>
</tr>
<tr>
<td>Bindings</td>
<td>No bindings</td>
</tr>
</table>
</section>
<section>
<h2>Crypto++: AES encrypt</h2>
<pre><code class="cpp">
CryptoPP::GCM<CryptoPP::AES>::Encryption e;
e.SetKeyWithIV(key, sizeof(key), iv, sizeof(iv));
CryptoPP::AuthenticatedEncryptionFilter ef(e,
new CryptoPP::StringSink( cipher ), false, TAG_SIZE);
ef.ChannelPut("AAD", (const byte*)adata.data(), adata.size());
ef.ChannelMessageEnd("AAD");
ef.ChannelPut("", (const byte*)pdata.data(), pdata.size());
ef.ChannelMessageEnd("");
CryptoPP::StringSource(cipher, true,
new CryptoPP::HexEncoder(
new CryptoPP::StringSink(encoded), true, 16, " " ));
</code></pre>
</section>
<section>
<h2>Contributions welcome!</h2>
<ul>
<li>Review code</li>
<li>Use static analyzers</li>
<li>Fuzz (see https://github.com/randombit/botan-fuzzers)</li>
<li>mod_botan?</li>
<li>strongswan plugin?</li>
<li>More: doc/todo.rst</li>
</ul>
</section>
<section>
<h2>Slides and example code</h2>
<p><small><a href="https://github.com/cordney/botan-pottcpp">https://github.com/cordney/botan-pottcpp</a></small></p>
</section>
<section>
<h2>Thank you. Questions?</h2>
</section>
</div>
</div>
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