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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/secp256k1/secp256k1.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Secp256k1</h1></header><article><div><span><p><a href="https://github.com/bitcoin-core/secp256k1">Libsecp256k1</a> is used to preform cryptographic operations on the secp256k1 curve.
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This is the curve that bitcoin uses. There is a <em>signficant</em> speedup when using this library compared to java crypto libraries
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like bouncy castle.</p>
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<p>In bitcoin-s, we support native binaries for libsecp256k1</p>
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<ol>
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<li><a href="../../secp256k1jni/natives/linux_32">linux 32 bit</a></li>
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<li><a href="../../secp256k1jni/natives/linux_64">linux 64 bit</a></li>
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<li><a href="../../secp256k1jni/natives/osx_64">mac osx 64 bit</a></li>
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<li><a href="../../secp256k1jni/natives/windows_64">windows 64 bit</a></li>
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</ol>
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<p>Bitcoin-s uses a zero dependency library called <a href="https://github.com/scijava/native-lib-loader"><code>native-lib-loader</code></a>.
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That does the appropriate loading of the library onto your classpath to be accessed.</p>
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<h4><a class="anchor" aria-hidden="true" id="using-libsecp256k1"></a><a href="#using-libsecp256k1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using libsecp256k1</h4>
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<p>To tell if you have access to libsecp256k1 you can do the following</p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">val</span> isEnabled = org.bitcoin.<span class="hljs-type">Secp256k1Context</span>.isEnabled()
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println(<span class="hljs-string">s"Secp256k1Context.isEnabled=<span class="hljs-subst">${isEnabled}</span>"</span>)
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</code></pre>
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<p>If libsecp256k1 is enabled, you can use <a href="../../secp256k1jni/src/main/java/org/bitcoin/NativeSecp256k1.java">NativeSecp256k1</a>
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with static method defined in the class.</p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">val</span> privKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
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<span class="hljs-keyword">val</span> pubKey = privKey.publicKey
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<span class="hljs-keyword">val</span> dataToSign = <span class="hljs-type">DoubleSha256Digest</span>.empty
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<span class="hljs-keyword">val</span> signature = <span class="hljs-type">NativeSecp256k1</span>.sign(dataToSign.bytes.toArray, privKey.bytes.toArray)
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<span class="hljs-keyword">val</span> verify = <span class="hljs-type">NativeSecp256k1</span>.verify(dataToSign.bytes.toArray, signature, pubKey.bytes.toArray)
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println(<span class="hljs-string">s"Verified with NativeSecp256k1 signature=<span class="hljs-subst">${verify}</span>"</span>)
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<span class="hljs-comment">//you can also just directly sign with the ECKey interface:</span>
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<span class="hljs-keyword">val</span> signature2 = privKey.sign(dataToSign)
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<span class="hljs-keyword">val</span> verified2 = pubKey.verify(dataToSign, signature2)
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println(<span class="hljs-string">s"Verified with NativeSecp256k1 again=<span class="hljs-subst">${verified2}</span>"</span>)
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</code></pre>
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<h3><a class="anchor" aria-hidden="true" id="when-libsecp256k1-isnt-available-or-you-want-to-turn-it-off"></a><a href="#when-libsecp256k1-isnt-available-or-you-want-to-turn-it-off" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When libsecp256k1 isn't available, or you want to turn it off</h3>
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<p>There are two reasons you wouldn't want to use libsecp256k1</p>
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<ol>
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<li>You don't trust the pre-compiled binaries we are using</li>
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<li>Your OS/arch is not supported</li>
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</ol>
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<p>There are two ways you can circumvent libsecp256k1</p>
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<ol>
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<li>Set <code>DISABLE_SECP256K1=true</code> in your environment variables. This will force <code>Secp256k1Context.isEnabled()</code> to return false</li>
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<li>Call Bouncy castle methods in <code>ECKey</code>.</li>
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</ol>
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<p>Here is an example of calling bouncy castle methods in <code>ECKey</code></p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">val</span> privKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
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<span class="hljs-comment">// privKey: ECPrivateKey = Masked(ECPrivateKeyImpl)</span>
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<span class="hljs-keyword">val</span> publicKey = privKey.publicKeyWithBouncyCastle
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<span class="hljs-comment">// publicKey: ECPublicKey = ECPublicKey(03b12dbe31d79acc699af9ea0c741ab1e98d821a885ad8690cfc2f9921decc771b)</span>
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<span class="hljs-keyword">val</span> dataToSign = <span class="hljs-type">DoubleSha256Digest</span>.empty
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<span class="hljs-comment">// dataToSign: DoubleSha256Digest = DoubleSha256Digest(0000000000000000000000000000000000000000000000000000000000000000)</span>
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<span class="hljs-keyword">val</span> signature = privKey.signWithBouncyCastle(dataToSign.bytes)
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<span class="hljs-comment">// signature: ECDigitalSignature = ECDigitalSignature(30440220042bb6ce44f919a759e341f4f87e6ccd074253161e50d1d84668da68fbfb3f2a022036c759496f425b24446c79240dcc8fc1fe3c5c4ae2619fcb960efae98e37df26)</span>
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<span class="hljs-keyword">val</span> verified = publicKey.verifyWithBouncyCastle(dataToSign.bytes, signature)
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<span class="hljs-comment">// verified: Boolean = true</span>
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println(<span class="hljs-string">s"Verified with bouncy castle=<span class="hljs-subst">${verified}</span>"</span>)
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<span class="hljs-comment">// Verified with bouncy castle=true</span>
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</code></pre>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-5-25 by Ben Carman</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/rpc/rpc-bitcoind"><span class="arrow-prev">← </span><span>bitcoind/Bitcoin Core</span></a><a class="docs-next button" href="/docs/testkit/testkit"><span>Testkit</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/favicon.ico" alt="bitcoin-s" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/getting-started">Getting Started</a><a href="/docs/en/core/core-intro">Guides</a><a href="/api/org/bitcoins">API Reference</a></div><div><h5>Community</h5><a href="/en/users.html">User Showcase</a><a href="https://join.slack.com/t/suredbits/shared_invite/enQtNDEyMjY3MTg1MTg3LTYyYjkwOGUzMDQ4NDAwZjE1M2I3MmQyNWNlZjNlYjg4OGRjYTRjNWUwNjRjNjg4Y2NjZjAxYjU1N2JjMTU1YWM" target="_blank" rel="noreferrer noopener">Slack</a><a href="https://gitter.im/bitcoin-s-core/">Gitter chat</a></div><div><h5>More</h5><a href="https://github.com/bitcoin-s/bitcoin-s">GitHub</a><a class="github-button" href="https://github.com/bitcoin-s/bitcoin-s" data-icon="octicon-star" data-count-href="/bitcoin-s/bitcoin-s-core/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 Suredbits & the bitcoin-s developers</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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