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347 lines
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<title>ecdsa - The Go Programming Language</title>
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<div class="top-heading" id="heading-wide"><a href="http://localhost:6060/">The Go Programming Language</a></div>
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<h1>Package ecdsa</h1>
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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</script>
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<div id="short-nav">
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<dl>
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<dd><code>import "crypto/ecdsa"</code></dd>
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</dl>
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<dl>
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<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
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<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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<h2 class="toggleButton" title="Click to show Overview section">Overview ▹</h2>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
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<p>
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Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as
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defined in FIPS 186-3.
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</p>
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<p>
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This implementation derives the nonce from an AES-CTR CSPRNG keyed by
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ChopMD(256, SHA2-512(priv.D || entropy || hash)). The CSPRNG key is IRO by
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a result of Coron; the AES-CTR stream is IRO under standard assumptions.
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</p>
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</div>
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</div>
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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<h2 class="toggleButton" title="Click to hide Index section">Index ▾</h2>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
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<div id="manual-nav">
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<dl>
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<dd><a href="index.html#Sign">func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r, s *big.Int, err error)</a></dd>
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<dd><a href="index.html#Verify">func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool</a></dd>
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<dd><a href="index.html#PrivateKey">type PrivateKey</a></dd>
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<dd> <a href="index.html#GenerateKey">func GenerateKey(c elliptic.Curve, rand io.Reader) (priv *PrivateKey, err error)</a></dd>
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<dd> <a href="index.html#PrivateKey.Public">func (priv *PrivateKey) Public() crypto.PublicKey</a></dd>
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<dd> <a href="index.html#PrivateKey.Sign">func (priv *PrivateKey) Sign(rand io.Reader, msg []byte, opts crypto.SignerOpts) ([]byte, error)</a></dd>
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<dd><a href="index.html#PublicKey">type PublicKey</a></dd>
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</dl>
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</div><!-- #manual-nav -->
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<h4>Package files</h4>
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<p>
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<span style="font-size:90%">
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<a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go">ecdsa.go</a>
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</span>
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</p>
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</div><!-- .expanded -->
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</div><!-- #pkg-index -->
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<h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2>
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</div> <!-- .expanded -->
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
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<p>
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In the call graph viewer below, each node
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is a function belonging to this package
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and its children are the functions it
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calls—perhaps dynamically.
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</p>
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<p>
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The root nodes are the entry points of the
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package: functions that may be called from
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outside the package.
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There may be non-exported or anonymous
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functions among them if they are called
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dynamically from another package.
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</p>
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<p>
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Click a node to visit that function's source code.
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From there you can visit its callers by
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clicking its declaring <code>func</code>
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token.
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</p>
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<p>
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Functions may be omitted if they were
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determined to be unreachable in the
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particular programs or tests that were
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analyzed.
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</p>
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<!-- Zero means show all package entry points. -->
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<ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
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</div>
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</div> <!-- #pkg-callgraph -->
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<h2 id="Sign">func <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=4284:4367#L137">Sign</a></h2>
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<pre>func Sign(rand <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>, priv *<a href="index.html#PrivateKey">PrivateKey</a>, hash []<a href="../../builtin/index.html#byte">byte</a>) (r, s *<a href="../../math/big/index.html">big</a>.<a href="../../math/big/index.html#Int">Int</a>, err <a href="../../builtin/index.html#error">error</a>)</pre>
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<p>
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Sign signs an arbitrary length hash (which should be the result of hashing a
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larger message) using the private key, priv. It returns the signature as a
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pair of integers. The security of the private key depends on the entropy of
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rand.
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</p>
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<h2 id="Verify">func <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=5960:6020#L211">Verify</a></h2>
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<pre>func Verify(pub *<a href="index.html#PublicKey">PublicKey</a>, hash []<a href="../../builtin/index.html#byte">byte</a>, r, s *<a href="../../math/big/index.html">big</a>.<a href="../../math/big/index.html#Int">Int</a>) <a href="../../builtin/index.html#bool">bool</a></pre>
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<p>
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Verify verifies the signature in r, s of hash using the public key, pub. Its
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return value records whether the signature is valid.
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</p>
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<h2 id="PrivateKey">type <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=1378:1427#L42">PrivateKey</a></h2>
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<pre>type PrivateKey struct {
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<a href="index.html#PublicKey">PublicKey</a>
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D *<a href="../../math/big/index.html">big</a>.<a href="../../math/big/index.html#Int">Int</a>
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}</pre>
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<p>
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PrivateKey represents a ECDSA private key.
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</p>
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<h3 id="GenerateKey">func <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=2606:2686#L89">GenerateKey</a></h3>
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<pre>func GenerateKey(c <a href="../elliptic/index.html">elliptic</a>.<a href="../elliptic/index.html#Curve">Curve</a>, rand <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) (priv *<a href="index.html#PrivateKey">PrivateKey</a>, err <a href="../../builtin/index.html#error">error</a>)</pre>
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<p>
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GenerateKey generates a public and private key pair.
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</p>
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<h3 id="PrivateKey.Public">func (*PrivateKey) <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=1532:1581#L52">Public</a></h3>
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<pre>func (priv *<a href="index.html#PrivateKey">PrivateKey</a>) Public() <a href="../index.html">crypto</a>.<a href="../index.html#PublicKey">PublicKey</a></pre>
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<p>
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Public returns the public key corresponding to priv.
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</p>
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<h3 id="PrivateKey.Sign">func (*PrivateKey) <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=1853:1949#L60">Sign</a></h3>
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<pre>func (priv *<a href="index.html#PrivateKey">PrivateKey</a>) Sign(rand <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>, msg []<a href="../../builtin/index.html#byte">byte</a>, opts <a href="../index.html">crypto</a>.<a href="../index.html#SignerOpts">SignerOpts</a>) ([]<a href="../../builtin/index.html#byte">byte</a>, <a href="../../builtin/index.html#error">error</a>)</pre>
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<p>
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Sign signs msg with priv, reading randomness from rand. This method is
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intended to support keys where the private part is kept in, for example, a
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hardware module. Common uses should use the Sign function in this package
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directly.
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</p>
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<h2 id="PublicKey">type <a href="http://localhost:6060/src/crypto/ecdsa/ecdsa.go?s=1274:1330#L36">PublicKey</a></h2>
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<pre>type PublicKey struct {
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<a href="../elliptic/index.html">elliptic</a>.<a href="../elliptic/index.html#Curve">Curve</a>
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X, Y *<a href="../../math/big/index.html">big</a>.<a href="../../math/big/index.html#Int">Int</a>
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}</pre>
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<p>
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PublicKey represents an ECDSA public key.
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</p>
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<div id="footer">
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Build version go1.6.<br>
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Except as <a href="https://developers.google.com/site-policies#restrictions">noted</a>,
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the content of this page is licensed under the
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Creative Commons Attribution 3.0 License,
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