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<!DOCTYPE html>
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<title>Decrypt data</title>
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<!--BEGVDOC90-->
<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;'> Decrypt data</div><hr/><span style="font-weight:bold;">Purpose</span>: Decrypt data.<br/>
<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_405'>
<span class="Statement"> decrypt-data</span> <data><span class="Type"> to</span> <result> \
[<span class="Identifier"> input-length</span> <input length> ] \
[<span class="Identifier"> binary</span> [ <binary> ] ] \
(<span class="Identifier"> password</span> <password> \
[<span class="Identifier"> salt</span> <salt> [<span class="Identifier"> salt-length</span> <salt length> ] ] \
[<span class="Identifier"> iterations</span> <iterations> ] \
[<span class="Identifier"> cipher</span> <cipher algorithm> ] \
[<span class="Identifier"> digest</span> <digest algorithm> ]
[<span class="Identifier"> cache</span> ]
[<span class="Identifier"> clear-cache</span> <clear cache> <span class="Error">)</span> \
[<span class="Identifier"> init-vector</span> <init vector> ]</pre>
<span id=golf_copied_405 style='position:absolute;right:-14px;top:-30px; cursor: pointer;visibility:hidden;background:white;'>Copied!</span>
<textarea id='golft_405' style='position: absolute;left: -500%;'></textarea>
<img src='https://golf-lang.com/golf-copy-small-1.png' id='golfb' onclick='gg_copy(golft_405, code_405, golf_copied_405)' style='position:absolute;right:0;top:0; cursor: pointer;opacity:0.5;'/>
</div><br/>
decrypt-data will decrypt <data> which must have been encrypted with <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>, or other software using the same algorithms and clauses as specified. <br/>
<br/>
If "input-length" clause is not used, then the number of bytes decrypted is the length of <data> (see <a href='https://golf-lang.com/string-length.html'>string-length</a>); if "input-length" is specified, then exactly <input length> bytes are decrypted. Password used for decryption is string <password> (in "password" clause) and it must match the password used in <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>. If "salt" clause is used, then string <salt> must match the salt used in encryption. If "init-vector" clause is used, then string <init vector> must match the IV (initialization vector) used in encryption. If "iterations" clause is used, then <iterations> must match the number used in encryption.<br/>
<br/>
The result of decryption is in <result> (in "to" clause).<br/>
<br/>
If data was encrypted in binary mode (see <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>), you must decrypt it with the same, and if it wasn't, then you must not use it in decrypt-data either. The reason for this is obvious - binary mode of encryption is encrypted data in its shortest form, and character mode (without "binary" or if <binary> evaluates to false) is the same data converted to a hexadecimal string - thus decryption must first convert such data back to binary before decrypting.<br/>
<br/>
The cipher and digest algorithms (if specified as <cipher algorithm> and <digest algorithm> in "cipher" and "digest" clauses respectively) must match what was used in <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>.<br/>
<br/>
"cache" clause is used to cache the result of key computation, so it is not computed each time decryption takes place, while "clear-cache" allows key to be re-computed every time <clear cache> evaluates to boolean true; re-computation of a key, if used, must match the usage during encryption. For more on "cache" and "clear-cache" clauses, as well as safety of encrypting/decrypting, see "Caching key" and "Safety" in <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>.<br/>
<div class="vsub"><a id="Examples"></a>Examples</div>
See <a href='https://golf-lang.com/encrypt-data.html'>encrypt-data</a>.<br/>
<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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