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302 lines
8.9 KiB
302 lines
8.9 KiB
<!DOCTYPE html>
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<title>subtle - The Go Programming Language</title>
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<link type="text/css" rel="stylesheet" href="../../../lib/godoc/style.css">
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...
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</div><!-- #lowframe -->
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<div id="topbar" class="wide"><div class="container">
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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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<div class="top-heading" id="heading-narrow"><a href="http://localhost:6060/">Go</a></div>
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<div id="page" class="wide">
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<div class="container">
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<h1>Package subtle</h1>
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<div id="nav"></div>
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<!--
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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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license that can be found in the LICENSE file.
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-->
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<!--
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Note: Static (i.e., not template-generated) href and id
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attributes start with "pkg-" to make it impossible for
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them to conflict with generated attributes (some of which
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correspond to Go identifiers).
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-->
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<script type='text/javascript'>
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document.ANALYSIS_DATA = null;
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document.CALLGRAPH = null;
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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/subtle"</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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</dl>
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</div>
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<!-- The package's Name is printed as title by the top-level template -->
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<div id="pkg-overview" class="toggleVisible">
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<h2 class="toggleButton" title="Click to show Overview section">Overview ▹</h2>
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</div>
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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 subtle implements functions that are often useful in cryptographic
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code but require careful thought to use correctly.
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</p>
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</div>
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</div>
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<div id="pkg-index" class="toggleVisible">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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</div>
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<div class="expanded">
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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#ConstantTimeByteEq">func ConstantTimeByteEq(x, y uint8) int</a></dd>
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<dd><a href="index.html#ConstantTimeCompare">func ConstantTimeCompare(x, y []byte) int</a></dd>
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<dd><a href="index.html#ConstantTimeCopy">func ConstantTimeCopy(v int, x, y []byte)</a></dd>
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<dd><a href="index.html#ConstantTimeEq">func ConstantTimeEq(x, y int32) int</a></dd>
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<dd><a href="index.html#ConstantTimeLessOrEq">func ConstantTimeLessOrEq(x, y int) int</a></dd>
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<dd><a href="index.html#ConstantTimeSelect">func ConstantTimeSelect(v, x, y int) int</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/subtle/constant_time.go">constant_time.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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<div id="pkg-callgraph" class="toggle" style="display: none">
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<div class="collapsed">
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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="ConstantTimeByteEq">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=922:961#L21">ConstantTimeByteEq</a></h2>
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<pre>func ConstantTimeByteEq(x, y <a href="../../builtin/index.html#uint8">uint8</a>) <a href="../../builtin/index.html#int">int</a></pre>
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<p>
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ConstantTimeByteEq returns 1 if x == y and 0 otherwise.
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</p>
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<h2 id="ConstantTimeCompare">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=490:531#L2">ConstantTimeCompare</a></h2>
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<pre>func ConstantTimeCompare(x, y []<a href="../../builtin/index.html#byte">byte</a>) <a href="../../builtin/index.html#int">int</a></pre>
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<p>
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ConstantTimeCompare returns 1 iff the two slices, x
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and y, have equal contents. The time taken is a function of the length of
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the slices and is independent of the contents.
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</p>
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<h2 id="ConstantTimeCopy">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=1415:1456#L45">ConstantTimeCopy</a></h2>
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<pre>func ConstantTimeCopy(v <a href="../../builtin/index.html#int">int</a>, x, y []<a href="../../builtin/index.html#byte">byte</a>)</pre>
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<p>
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ConstantTimeCopy copies the contents of y into x (a slice of equal length)
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if v == 1. If v == 0, x is left unchanged. Its behavior is undefined if v
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takes any other value.
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</p>
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<h2 id="ConstantTimeEq">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=1092:1127#L31">ConstantTimeEq</a></h2>
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<pre>func ConstantTimeEq(x, y <a href="../../builtin/index.html#int32">int32</a>) <a href="../../builtin/index.html#int">int</a></pre>
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<p>
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ConstantTimeEq returns 1 if x == y and 0 otherwise.
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</p>
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<h2 id="ConstantTimeLessOrEq">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=1781:1820#L59">ConstantTimeLessOrEq</a></h2>
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<pre>func ConstantTimeLessOrEq(x, y <a href="../../builtin/index.html#int">int</a>) <a href="../../builtin/index.html#int">int</a></pre>
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<p>
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ConstantTimeLessOrEq returns 1 if x <= y and 0 otherwise.
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Its behavior is undefined if x or y are negative or > 2**31 - 1.
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</p>
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<h2 id="ConstantTimeSelect">func <a href="http://localhost:6060/src/crypto/subtle/constant_time.go?s=791:831#L18">ConstantTimeSelect</a></h2>
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<pre>func ConstantTimeSelect(v, x, y <a href="../../builtin/index.html#int">int</a>) <a href="../../builtin/index.html#int">int</a></pre>
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<p>
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ConstantTimeSelect returns x if v is 1 and y if v is 0.
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Its behavior is undefined if v takes any other value.
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</p>
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<div id="footer">
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Creative Commons Attribution 3.0 License,
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