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<h1> Package subtle </h1> <ul id="short-nav">
<li><code>import "crypto/subtle"</code></li>
<li><a href="#pkg-overview" class="overviewLink">Overview</a></li>
<li><a href="#pkg-index" class="indexLink">Index</a></li>
</ul> <h2 id="pkg-overview">Overview </h2> <p>Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly. </p> <h2 id="pkg-index">Index </h2> <ul id="manual-nav">
<li><a href="#ConstantTimeByteEq">func ConstantTimeByteEq(x, y uint8) int</a></li>
<li><a href="#ConstantTimeCompare">func ConstantTimeCompare(x, y []byte) int</a></li>
<li><a href="#ConstantTimeCopy">func ConstantTimeCopy(v int, x, y []byte)</a></li>
<li><a href="#ConstantTimeEq">func ConstantTimeEq(x, y int32) int</a></li>
<li><a href="#ConstantTimeLessOrEq">func ConstantTimeLessOrEq(x, y int) int</a></li>
<li><a href="#ConstantTimeSelect">func ConstantTimeSelect(v, x, y int) int</a></li>
<li><a href="#XORBytes">func XORBytes(dst, x, y []byte) int</a></li>
</ul> <h3>Package files</h3> <p> <span>constant_time.go</span> <span>xor.go</span> <span>xor_amd64.go</span> </p> <h2 id="ConstantTimeByteEq">func <span>ConstantTimeByteEq</span> </h2> <pre data-language="go">func ConstantTimeByteEq(x, y uint8) int</pre> <p>ConstantTimeByteEq returns 1 if x == y and 0 otherwise. </p>
<h2 id="ConstantTimeCompare">func <span>ConstantTimeCompare</span> </h2> <pre data-language="go">func ConstantTimeCompare(x, y []byte) int</pre> <p>ConstantTimeCompare returns 1 if the two slices, x and y, have equal contents and 0 otherwise. The time taken is a function of the length of the slices and is independent of the contents. If the lengths of x and y do not match it returns 0 immediately. </p>
<h2 id="ConstantTimeCopy">func <span>ConstantTimeCopy</span> </h2> <pre data-language="go">func ConstantTimeCopy(v int, x, y []byte)</pre> <p>ConstantTimeCopy copies the contents of y into x (a slice of equal length) if v == 1. If v == 0, x is left unchanged. Its behavior is undefined if v takes any other value. </p>
<h2 id="ConstantTimeEq">func <span>ConstantTimeEq</span> </h2> <pre data-language="go">func ConstantTimeEq(x, y int32) int</pre> <p>ConstantTimeEq returns 1 if x == y and 0 otherwise. </p>
<h2 id="ConstantTimeLessOrEq">func <span>ConstantTimeLessOrEq</span> <span title="Added in Go 1.2">1.2</span> </h2> <pre data-language="go">func ConstantTimeLessOrEq(x, y int) int</pre> <p>ConstantTimeLessOrEq returns 1 if x <= y and 0 otherwise. Its behavior is undefined if x or y are negative or > 2**31 - 1. </p>
<h2 id="ConstantTimeSelect">func <span>ConstantTimeSelect</span> </h2> <pre data-language="go">func ConstantTimeSelect(v, x, y int) int</pre> <p>ConstantTimeSelect returns x if v == 1 and y if v == 0. Its behavior is undefined if v takes any other value. </p>
<h2 id="XORBytes">func <span>XORBytes</span> <span title="Added in Go 1.20">1.20</span> </h2> <pre data-language="go">func XORBytes(dst, x, y []byte) int</pre> <p>XORBytes sets dst[i] = x[i] ^ y[i] for all i < n = min(len(x), len(y)), returning n, the number of bytes written to dst. If dst does not have length at least n, XORBytes panics without writing anything to dst. </p><div class="_attribution">
<p class="_attribution-p">
© Google, Inc.<br>Licensed under the Creative Commons Attribution License 3.0.<br>
<a href="http://golang.org/pkg/crypto/subtle/" class="_attribution-link">http://golang.org/pkg/crypto/subtle/</a>
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