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| valign='top' width='90' | '''Signatures'''
|<code><b>crypto:hmac</b>($message as xs:string(), $secret-key as xs:string(), algorithm as xs:string()) as xs:string()</code><br/><code><b>crypto:hmac</b>($message as xs:string(), $secret-key as xs:string(), algorithm as xs:string(), $encoding as xs:string()) as xs:string()</code>
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| valign='top' | '''Summary'''
|This function creates Creates a message authentication code via a cryptographic hash function and a secret key. $encoding must either be <code>hex</code>, <code>base64</code> or the empty string (default is <code>base64</code>) and specifies the encoding of the returned authentication code.
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| valign='top' | '''Errors'''
|<b>?</b>
|}
