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<h1 id="nix-hash"><code>nix-hash</code></h1>
<p>Compute the cryptographic hash of a path.</p>
<h2 id="synopsis">Synopsis</h2>
<p><code>nix-hash</code> [<code>--flat</code>] [<code>--base32</code>] [<code>--truncate</code>] [<code>--type</code> <em>hashAlgo</em>] <em>path…</em></p>
<p><code>nix-hash</code> [<code>--to-base16</code>|<code>--to-base32</code>|<code>--to-base64</code>|<code>--to-sri</code>] [<code>--type</code> <em>hashAlgo</em>] <em>hash…</em></p>
<h2 id="description">Description</h2>
<p>The command <code>nix-hash</code> computes the cryptographic hash of the contents
of each <em>path</em> and prints it on standard output. By default, it computes
an MD5 hash, but other hash algorithms are available as well. The hash
is printed in hexadecimal. To generate the same hash as
<code>nix-prefetch-url</code> you have to specify multiple arguments, see below for
an example.</p>
<p>The hash is computed over a <em>serialisation</em> of each path: a dump of
the file system tree rooted at the path. This allows directories and
symlinks to be hashed as well as regular files. The dump is in the
<em>NAR format</em> produced by <a href="../nix-store/dump/"><code>nix-store
--dump</code></a>. Thus, <code>nix-hash path</code>
yields the same cryptographic hash as <code>nix-store --dump path |
md5sum</code>.</p>
<h2 id="options">Options</h2>
<ul>
<li>
<p><code>--flat</code>
Print the cryptographic hash of the contents of each regular file
<em>path</em>. That is, do not compute the hash over the dump of <em>path</em>.
The result is identical to that produced by the GNU commands
<code>md5sum</code> and <code>sha1sum</code>.</p>
</li>
<li>
<p><code>--base16</code>
Print the hash in a hexadecimal representation (default).</p>
</li>
<li>
<p><code>--base32</code>
Print the hash in a base-32 representation rather than hexadecimal.
This base-32 representation is more compact and can be used in Nix
expressions (such as in calls to <code>fetchurl</code>).</p>
</li>
<li>
<p><code>--base64</code>
Similar to --base32, but print the hash in a base-64 representation,
which is more compact than the base-32 one.</p>
</li>
<li>
<p><code>--sri</code>
Print the hash in SRI format with base-64 encoding.
The type of hash algorithm will be prepended to the hash string,
followed by a hyphen (-) and the base-64 hash body.</p>
</li>
<li>
<p><code>--truncate</code>
Truncate hashes longer than 160 bits (such as SHA-256) to 160 bits.</p>
</li>
<li>
<p><code>--type</code> <em>hashAlgo</em>
Use the specified cryptographic hash algorithm, which can be one of
<code>md5</code>, <code>sha1</code>, <code>sha256</code>, and <code>sha512</code>.</p>
</li>
<li>
<p><code>--to-base16</code>
Don’t hash anything, but convert the base-32 hash representation
<em>hash</em> to hexadecimal.</p>
</li>
<li>
<p><code>--to-base32</code>
Don’t hash anything, but convert the hexadecimal hash representation
<em>hash</em> to base-32.</p>
</li>
<li>
<p><code>--to-base64</code>
Don’t hash anything, but convert the hexadecimal hash representation
<em>hash</em> to base-64.</p>
</li>
<li>
<p><code>--to-sri</code>
Don’t hash anything, but convert the hexadecimal hash representation
<em>hash</em> to SRI.</p>
</li>
</ul>
<h2 id="examples">Examples</h2>
<p>Computing the same hash as <code>nix-prefetch-url</code>:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix-prefetch-url<span class="w"> </span>file://&lt;<span class="o">(</span><span class="nb">echo</span><span class="w"> </span><span class="nb">test</span><span class="o">)</span>
<span class="go">1lkgqb6fclns49861dwk9rzb6xnfkxbpws74mxnx01z9qyv1pjpj</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha256<span class="w"> </span>--flat<span class="w"> </span>--base32<span class="w"> </span>&lt;<span class="o">(</span><span class="nb">echo</span><span class="w"> </span><span class="nb">test</span><span class="o">)</span>
<span class="go">1lkgqb6fclns49861dwk9rzb6xnfkxbpws74mxnx01z9qyv1pjpj</span>
</code></pre></div>
<p>Computing hashes:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>mkdir<span class="w"> </span><span class="nb">test</span>
<span class="gp">$ </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;hello&quot;</span><span class="w"> </span>&gt;<span class="w"> </span>test/world
<span class="gp">$ </span>nix-hash<span class="w"> </span>test/<span class="w"> </span><span class="o">(</span>MD5<span class="w"> </span>hash<span class="p">;</span><span class="w"> </span>default<span class="o">)</span>
<span class="go">8179d3caeff1869b5ba1744e5a245c04</span>
<span class="gp">$ </span>nix-store<span class="w"> </span>--dump<span class="w"> </span>test/<span class="w"> </span><span class="p">|</span><span class="w"> </span>md5sum<span class="w"> </span><span class="o">(</span><span class="k">for</span><span class="w"> </span>comparison<span class="o">)</span>
<span class="go">8179d3caeff1869b5ba1744e5a245c04 -</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>test/
<span class="go">e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--base16<span class="w"> </span>test/
<span class="go">e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--base32<span class="w"> </span>test/
<span class="go">nvd61k9nalji1zl9rrdfmsmvyyjqpzg4</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--base64<span class="w"> </span>test/
<span class="go">5P2Lpfe76upazon+ECVVNs1g2rY=</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--sri<span class="w"> </span>test/
<span class="go">sha1-5P2Lpfe76upazon+ECVVNs1g2rY=</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha256<span class="w"> </span>--flat<span class="w"> </span>test/
<span class="go">error: reading file `test/&#39;: Is a directory</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha256<span class="w"> </span>--flat<span class="w"> </span>test/world
<span class="go">5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03</span>
</code></pre></div>
<p>Converting between hexadecimal, base-32, base-64, and SRI:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--to-base32<span class="w"> </span>e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6
<span class="go">nvd61k9nalji1zl9rrdfmsmvyyjqpzg4</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--to-base16<span class="w"> </span>nvd61k9nalji1zl9rrdfmsmvyyjqpzg4
<span class="go">e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--to-base64<span class="w"> </span>e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6
<span class="go">5P2Lpfe76upazon+ECVVNs1g2rY=</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--type<span class="w"> </span>sha1<span class="w"> </span>--to-sri<span class="w"> </span>nvd61k9nalji1zl9rrdfmsmvyyjqpzg4
<span class="go">sha1-5P2Lpfe76upazon+ECVVNs1g2rY=</span>
<span class="gp">$ </span>nix-hash<span class="w"> </span>--to-base16<span class="w"> </span>sha1-5P2Lpfe76upazon+ECVVNs1g2rY<span class="o">=</span>
<span class="go">e4fd8ba5f7bbeaea5ace89fe10255536cd60dab6</span>
</code></pre></div>
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