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+<h1> Package sha1  </h1>     <ul id="short-nav">
+<li><code>import "crypto/sha1"</code></li>
+<li><a href="#pkg-overview" class="overviewLink">Overview</a></li>
+<li><a href="#pkg-index" class="indexLink">Index</a></li>
+<li><a href="#pkg-examples" class="examplesLink">Examples</a></li>
+</ul>     <h2 id="pkg-overview">Overview </h2> <p>Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174. </p>
+<p>SHA-1 is cryptographically broken and should not be used for secure applications. </p>     <h2 id="pkg-index">Index </h2>  <ul id="manual-nav">
+<li><a href="#pkg-constants">Constants</a></li>
+<li><a href="#New">func New() hash.Hash</a></li>
+<li><a href="#Sum">func Sum(data []byte) [Size]byte</a></li>
+</ul> <div id="pkg-examples"> <h3>Examples</h3>  <dl> <dd><a class="exampleLink" href="#example_New">New</a></dd> <dd><a class="exampleLink" href="#example_New_file">New (File)</a></dd> <dd><a class="exampleLink" href="#example_Sum">Sum</a></dd> </dl> </div> <h3>Package files</h3> <p>  <span>sha1.go</span> <span>sha1block.go</span> <span>sha1block_amd64.go</span>  </p>   <h2 id="pkg-constants">Constants</h2> <p>The blocksize of SHA-1 in bytes. </p>
+<pre data-language="go">const BlockSize = 64</pre> <p>The size of a SHA-1 checksum in bytes. </p>
+<pre data-language="go">const Size = 20</pre> <h2 id="New">func <span>New</span>  </h2> <pre data-language="go">func New() hash.Hash</pre> <p>New returns a new hash.Hash computing the SHA1 checksum. The Hash also implements <span>encoding.BinaryMarshaler</span> and <span>encoding.BinaryUnmarshaler</span> to marshal and unmarshal the internal state of the hash. </p>   <h4 id="example_New"> <span class="text">Example</span>
+</h4> <p>Code:</p> <pre class="code" data-language="go">h := sha1.New()
+io.WriteString(h, "His money is twice tainted:")
+io.WriteString(h, " 'taint yours and 'taint mine.")
+fmt.Printf("% x", h.Sum(nil))
+</pre> <p>Output:</p> <pre class="output" data-language="go">59 7f 6a 54 00 10 f9 4c 15 d7 18 06 a9 9a 2c 87 10 e7 47 bd
+</pre>      <h4 id="example_New_file"> <span class="text">Example (File)</span>
+</h4> <p>Code:</p> <pre class="code" data-language="go">
+f, err := os.Open("file.txt")
+if err != nil {
+    log.Fatal(err)
+}
+defer f.Close()
+
+h := sha1.New()
+if _, err := io.Copy(h, f); err != nil {
+    log.Fatal(err)
+}
+
+fmt.Printf("% x", h.Sum(nil))
+</pre>   <h2 id="Sum">func <span>Sum</span>  <span title="Added in Go 1.2">1.2</span> </h2> <pre data-language="go">func Sum(data []byte) [Size]byte</pre> <p>Sum returns the SHA-1 checksum of the data. </p>   <h4 id="example_Sum"> <span class="text">Example</span>
+</h4> <p>Code:</p> <pre class="code" data-language="go">data := []byte("This page intentionally left blank.")
+fmt.Printf("% x", sha1.Sum(data))
+</pre> <p>Output:</p> <pre class="output" data-language="go">af 06 49 23 bb f2 30 15 96 aa c4 c2 73 ba 32 17 8e bc 4a 96
+</pre><div class="_attribution">
+  <p class="_attribution-p">
+    &copy; Google, Inc.<br>Licensed under the Creative Commons Attribution License 3.0.<br>
+    <a href="http://golang.org/pkg/crypto/sha1/" class="_attribution-link">http://golang.org/pkg/crypto/sha1/</a>
+  </p>
+</div>