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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/sign.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Sign API</h1></header><article><div><span><h3><a class="anchor" aria-hidden="true" id="the-sign-apiapiorgbitcoinscryptosign"></a><a href="#the-sign-apiapiorgbitcoinscryptosign" 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>The <a href="/api/org/bitcoins/crypto/Sign"><code>Sign</code> API</a></h3>
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<p>This is the API we define to sign things with. It takes in an arbitrary byte vector and returns a <code>Future[ECDigitalSignature]</code>. The reason we incorporate <code>Future</code>s here is for extensibility of this API. We would like to provide implementations of this API for hardware devices, which need to be asynchronous since they may require user input.</p>
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<p>From <a href="/api/org/bitcoins/crypto/Sign">Sign.scala</a>:</p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">import</span> scodec.bits._
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<span class="hljs-keyword">import</span> org.bitcoins.crypto._
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<span class="hljs-keyword">import</span> scala.concurrent._
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<span class="hljs-keyword">import</span> scala.concurrent.duration._
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<span class="hljs-class"><span class="hljs-keyword">trait</span> <span class="hljs-title">Sign</span> </span>{
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<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">signFunction</span></span>: <span class="hljs-type">ByteVector</span> => <span class="hljs-type">Future</span>[<span class="hljs-type">ECDigitalSignature</span>]
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<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">signFuture</span></span>(bytes: <span class="hljs-type">ByteVector</span>): <span class="hljs-type">Future</span>[<span class="hljs-type">ECDigitalSignature</span>] =
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signFunction(bytes)
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<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">sign</span></span>(bytes: <span class="hljs-type">ByteVector</span>): <span class="hljs-type">ECDigitalSignature</span> = {
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<span class="hljs-type">Await</span>.result(signFuture(bytes), <span class="hljs-number">30.</span>seconds)
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}
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<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">publicKey</span></span>: <span class="hljs-type">ECPublicKey</span>
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}
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</code></pre>
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<p>The <code>ByteVector</code> that is input to the <code>signFunction</code> should be the hash that is output from <a href="/api/org/bitcoins/core/crypto/TransactionSignatureSerializer"><code>TransactionSignatureSerializer</code></a>'s <code>hashForSignature</code> method. Our in-memory <a href="/api/org/bitcoins/crypto/BaseECKey"><code>BaseECKey</code></a> types implement the <code>Sign</code> API.</p>
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<p>If you wanted to implement a new <code>Sign</code> api for a hardware wallet, you can easily pass it into the <code>TxBuilder</code>/<code>Signer</code> classes to allow for you to use those devices to sign with Bitcoin-S.</p>
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<p>This API is currently used to sign ordinary transactions with our <a href="/api/org/bitcoins/core/wallet/signer/Signer"><code>Signer</code></a>s. The <code>Signer</code> subtypes (i.e. <code>P2PKHSigner</code>) implement the specific functionality needed to produce a valid digital signature for their corresponding script type.</p>
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<h3><a class="anchor" aria-hidden="true" id="the-extsignapiorgbitcoinscryptosign-api"></a><a href="#the-extsignapiorgbitcoinscryptosign-api" 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>The <a href="/api/org/bitcoins/crypto/Sign"><code>ExtSign</code></a> API.</h3>
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<p>An <a href="/api/org/bitcoins/core/crypto/ExtKey">ExtKey</a> is a data structure that can be used to generate more keys from a parent key. For more information look at <a href="/docs/next/core/hd-keys">hd-keys.md</a></p>
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<p>You can sign with <code>ExtPrivateKey</code> the same way you could with a normal <code>ECPrivateKey</code>.</p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">import</span> org.bitcoins.core.hd._
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<span class="hljs-keyword">import</span> org.bitcoins.core.crypto._
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<span class="hljs-keyword">val</span> extPrivKey = <span class="hljs-type">ExtPrivateKey</span>(<span class="hljs-type">ExtKeyVersion</span>.<span class="hljs-type">SegWitMainNetPriv</span>)
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<span class="hljs-comment">// extPrivKey: ExtPrivateKey = Masked(ExtPrivateKeyImpl)</span>
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extPrivKey.sign(<span class="hljs-type">DoubleSha256Digest</span>.empty.bytes)
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<span class="hljs-comment">// res0: ECDigitalSignature = ECDigitalSignature(3045022100b0b91f3d573046e5cada0425b2b83a256a9cd4edce3d1fa81bda900f54a082b502203b51603e56f5992c8b08778390a4c53fec936724aeb3f4f909f23ffdb92ae36f)</span>
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<span class="hljs-keyword">val</span> path = <span class="hljs-type">BIP32Path</span>(<span class="hljs-type">Vector</span>(<span class="hljs-type">BIP32Node</span>(<span class="hljs-number">0</span>,<span class="hljs-type">HardenedType</span>.defaultOpt)))
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<span class="hljs-comment">// path: BIP32Path = m/0'</span>
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extPrivKey.sign(<span class="hljs-type">DoubleSha256Digest</span>.empty.bytes,path)
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<span class="hljs-comment">// res1: ECDigitalSignature = ECDigitalSignature(3045022100ca3673c67eb6311398d97156690d8aa49df00514a8945a4f8bd751c8e610255f02204e8194e784eeafc9b15f01865aadc0313aacb3a24be29fe9f1a9f56f13735358)</span>
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</code></pre>
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<p>With <code>ExtSign</code>, you can use <code>ExtPrivateKey</code> to sign transactions inside of <code>TxBuilder</code> since <code>UTXOSpendingInfo</code> takes in <code>Sign</code> as a parameter.</p>
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<p>You can also provide a <code>path</code> to use to derive a child <code>ExtPrivateKey</code>, and then sign with that child private key</p>
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search && search.focus();
|
||
}
|
||
});
|
||
</script><script>
|
||
var search = docsearch({
|
||
|
||
apiKey: '0a510688bf8448e19aeb380377d328d3',
|
||
indexName: 'bitcoin-s',
|
||
inputSelector: '#search_input_react'
|
||
});
|
||
</script></body></html> |