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<section id="krb5-c-decrypt-decrypt-data-using-a-key-operates-on-keyblock">
<h1>krb5_c_decrypt - Decrypt data using a key (operates on keyblock).<a class="headerlink" href="#krb5-c-decrypt-decrypt-data-using-a-key-operates-on-keyblock" title="Permalink to this headline">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_c_decrypt">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_c_decrypt</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock"><span class="n"><span class="pre">krb5_keyblock</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">key</span></span>, <a class="reference internal" href="../types/krb5_keyusage.html#c.krb5_keyusage" title="krb5_keyusage"><span class="n"><span class="pre">krb5_keyusage</span></span></a><span class="w"> </span><span class="n"><span class="pre">usage</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cipher_state</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_enc_data.html#c.krb5_enc_data" title="krb5_enc_data"><span class="n"><span class="pre">krb5_enc_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_c_decrypt" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param</dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>key</strong> - Encryption key</p>
<p><strong>[in]</strong> <strong>usage</strong> - Key usage (see KRB5_KEYUSAGE macros)</p>
<p><strong>[inout]</strong> <strong>cipher_state</strong> - Cipher state; specify NULL if not needed</p>
<p><strong>[in]</strong> <strong>input</strong> - Encrypted data</p>
<p><strong>[out]</strong> <strong>output</strong> - Decrypted data</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval</dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<p>This function decrypts the data block <em>input</em> and stores the output into <em>output</em> . The actual decryption key will be derived from <em>key</em> and <em>usage</em> if key derivation is specified for the encryption type. If non-null, <em>cipher_state</em> specifies the beginning state for the decryption operation, and is updated with the state to be passed as input to the next operation.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The caller must initialize <em>output</em> and allocate at least enough space for the result. The usual practice is to allocate an output buffer as long as the ciphertext, and let krb5_c_decrypt() trim <em>output->length</em> . For some enctypes, the resulting <em>output->length</em> may include padding bytes.</p>
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