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<!DOCTYPE html>
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<title>Hmac string</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;'> Hmac string</div><hr/><span style="font-weight:bold;">Purpose</span>: Create HMAC.<br/>
<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_524'>
<span class="Statement"> hmac-string</span> <string><span class="Type"> to</span> <result> \
<span class="Identifier"> key</span> <key> \
[<span class="Identifier"> binary</span> [ <binary> ] \
[<span class="Identifier"> digest</span> <digest algorithm> ]</pre>
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hmac-string produces by default a SHA256-based HMAC (Hash Message Authentication Code) of <string> (if "digest" clause is not used) using secret <key>, and stores the result into <result>. 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_525'>
<span class="Comment">#get digests</span>
openssl list <span class="Special">-digest-algorithms</span></pre>
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If "binary" clause is used without boolean variable <binary>, or if <binary> evaluates to true, then the <result> is a binary string that may contain null-characters. With the default SHA256, it is 32 bytes in length, while for instance with SHA3-384 it is 48 bytes in length, etc. <br/>
<br/>
Without "binary" clause, or if <binary> evaluates to false, each binary byte of HMAC is converted to two hexadecimal characters ("0"-"9" and "a"-"f"), hence <result> is twice as long as with "binary" clause. <br/>
<div class="vsub"><a id="Examples"></a>Examples</div>
String "result" will have a HMAC value of a given string, an example of which might look like "2d948cc89148ef96fa4f1876e74af4ce984423d355beb12f7fdba5383143bee0"<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_526'>
<span class="Statement"> hmac-string</span> <span class="Constant">"some data"</span><span class="Identifier"> key</span> <span class="Constant">"mykey"</span><span class="Type"> to</span> result</pre>
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Using a different digest:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_527'>
<span class="Statement"> hmac-string</span> <span class="Constant">"some data"</span><span class="Identifier"> key</span> <span class="Constant">"mykey"</span><span class="Type"> to</span> result<span class="Identifier"> digest</span> <span class="Constant">"sha3-384"</span></pre>
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Producing a binary value instead of a null-terminated hexadecimal string, and then making a Base64 string out of it:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_528'>
<span class="Statement"> hmac-string</span> <span class="Constant">"some data"</span><span class="Identifier"> key</span> <span class="Constant">"mykey"</span><span class="Identifier"> digest</span> <span class="Constant">"SHA256"</span><span class="Type"> to</span> result<span class="Identifier"> binary</span>
<span class="Statement"> encode-base64</span> result<span class="Type"> to</span> bresult</pre>
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<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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