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<!DOCTYPE html>
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<title>Derive key</title>
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<div class='vhub' style='margin-top:10px;margin-right:20px;text-align:right;background-color:white;'><a href='https://golf-lang.com' style='border-bottom:0px'><img src='https://golf-lang.com/golf.png'/></a></div><div class='vhub' style='margin-top:10px;'> Derive key</div><hr/><span style="font-weight:bold;">Purpose</span>: Derive a key.<br/>
<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_403'>
<span class="Statement"> derive-key</span> <key><span class="Identifier"> from</span> <source><span class="Identifier"> length</span> <length> \
[<span class="Identifier"> binary</span> [ <binary> ] ] \
[<span class="Identifier"> from-length</span> <source length> ] \
[<span class="Identifier"> digest</span> <digest algorithm> ] \
[<span class="Identifier"> salt</span> <salt> [<span class="Identifier"> salt-length</span> <salt length> ] ] \
[<span class="Identifier"> iterations</span> <iterations> ]</pre>
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derive-key derives <key> from string <source> in "from" clause. If <source length> in "from-length" clause is specified, exactly <source length> bytes of <source> are used. Otherwise, the length of <source> string is used as the number of bytes (see <a href='https://golf-lang.com/string-length.html'>string-length</a>). <br/>
<br/>
The desired length of derived key is given by <length> in "length" clause. The method for key generation is PBKDF2. By default the digest used is "SHA256". You can use a different <digest algorithm> in "digest" clause (for example "SHA3-256"). To see a list of available digests:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_404'>
<span class="Comment">#get digests</span>
openssl list <span class="Special">-digest-algorithms</span></pre>
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</div><br/>
The salt for key derivation can be given with <salt> in "salt" clause. If "salt-length" clause is not specified, then the entire length of salt is used (see <a href='https://golf-lang.com/string-length.html'>string-length</a>), otherwise <salt length> bytes are used as salt.<br/>
<br/>
The number of iterations is given by <iterations> in "iterations" clause. The default is 1000 per <a href='https://www.rfc-editor.org/rfc/rfc8018'>RFC 8018</a>, though depending on your needs and the quality of <source> you may choose a different value.<br/>
<br/>
By default, the derived key is produced in a hexadecimal form, where each byte is encoded as two-character hexadecimal characters, so its length is 2*<length>. If "binary" clause is used without boolean variable <binary>, or if <binary> evaluates to true, then the output is a binary string of <length> bytes.<br/>
<br/>
Key derivation is often used when storing password-derivatives in the database (with salt), and also for symmetrical key generation.<br/>
<div class="vsub"><a id="Examples"></a>Examples</div>
Derived key is in variable "mk":<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_405'>
<span class="Statement"> random-string</span><span class="Type"> to</span> rs9<span class="Identifier"> length</span> <span class="Constant">16</span>
<span class="Statement"> derive-key</span> mk<span class="Identifier"> from</span> <span class="Constant">"clave secreta"</span><span class="Identifier"> digest</span> <span class="Constant">"sha-256"</span><span class="Identifier"> salt</span> rs9<span class="Identifier"> salt-length</span> <span class="Constant">10</span><span class="Identifier"> iterations</span> <span class="Constant">2000</span><span class="Identifier"> length</span> <span class="Constant">16</span></pre>
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<!--BEFSAL13--><div class="vsub"><a id="See also"></a>See also</div>
<a name='Encryption'></a><span style="font-weight:bold;">Encryption</span><br/>
<a href='https://golf-lang.com/decrypt-data.html'>decrypt-data</a> <br/>
<a href='https://golf-lang.com/derive-key.html'>derive-key</a> <br/>
<a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a> <br/>
<a href='https://golf-lang.com/hash-string.html'>hash-string</a> <br/>
<a href='https://golf-lang.com/hmac-string.html'>hmac-string</a> <br/>
<a href='https://golf-lang.com/random-crypto.html'>random-crypto</a> <br/>
<a href='https://golf-lang.com/random-string.html'>random-string</a> <br/>
<span style="font-weight:bold;">See all</span> <br/>
<a href='https://golf-lang.com/documentation.html'>documentation</a><br/>
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