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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/crypto/adaptor-signatures.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Adaptor Signatures</h1></header><article><div><span><p>Bitcoin-S now has support for <a href="https://github.com/discreetlogcontracts/dlcspecs/blob/03bf7095c2016e1ce9c9fb612920872d4456f179/ECDSA-adaptor.md">ECDSA Adaptor Signatures</a>.</p>
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<p>There are four relevant functions to adaptor signatures:</p>
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<ul>
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<li><code>sign</code> (aka encrypt)
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<ul>
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<li>This function belongs to <code>ECPrivateKey</code> and creates an adaptor signature given a message (<code>ByteVector</code>) and an adaptor point (<code>ECPublicKey</code>).</li>
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</ul></li>
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<li><code>verify</code>
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<ul>
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<li>Verifies an adaptor signature given the signing public key, the message and the adaptor point.</li>
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</ul></li>
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<li><code>complete</code> (aka decrypt)
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<ul>
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<li>This function belongs to <code>ECPrivateKey</code> and computes a valid ECDSA signature given a valid adaptor signature whose adaptor point is this private key's public key.</li>
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</ul></li>
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<li><code>extract</code> (aka recover)
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<ul>
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<li>This function belongs to <code>ECPublicKey</code> and computes the adaptor secret (private key to this public key) given a valid adaptor signature for this adaptor point, and the valid ECDSA signature computed using <code>complete</code>.</li>
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</ul></li>
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</ul>
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<p>The following code shows each function to do with adaptor signature usage:</p>
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<pre><code class="hljs css language-scala"><span class="hljs-comment">// Alice generages an adaptor signature using her private key and the adaptor point</span>
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<span class="hljs-keyword">val</span> adaptorSig = privKey.adaptorSign(adaptorPoint, msg)
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<span class="hljs-comment">// Bob verifies this adaptor signature using Alice's public key and the adaptor point</span>
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require(pubKey.adaptorVerify(msg, adaptorPoint, adaptorSig))
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<span class="hljs-comment">// Bob computes a valid ECDSA signature using the adaptorSignature, which he knows</span>
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<span class="hljs-keyword">val</span> sig = adaptorSecret.completeAdaptorSignature(adaptorSig)
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<span class="hljs-comment">// Anyone can validate this signature</span>
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require(pubKey.verify(msg, sig))
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<span class="hljs-comment">// Alice can compute the adaptor secret from the signatures</span>
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<span class="hljs-keyword">val</span> secret = adaptorPoint.extractAdaptorSecret(adaptorSig, sig)
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require(secret == adaptorSecret)
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</code></pre>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 4/23/2021 by Nadav Kohen</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/crypto/sign"><span class="arrow-prev">← </span><span>Sign API</span></a><a class="docs-next button" href="/docs/fee-provider/fee-provider"><span>Fee Provider</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/zt-eavycu0x-WQL7XOakzQo8tAy7jHHZUw" 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 © 2021 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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