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<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>
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<dt id="krb5_c_decrypt">
<a class="reference internal" href="../types/krb5_error_code.html#krb5_error_code" title="krb5_error_code">krb5_error_code</a> <tt class="descname">krb5_c_decrypt</tt><big>(</big><a class="reference internal" href="../types/krb5_context.html#krb5_context" title="krb5_context">krb5_context</a><em> context</em>, const <a class="reference internal" href="../types/krb5_keyblock.html#krb5_keyblock" title="krb5_keyblock">krb5_keyblock</a> *<em> key</em>, <a class="reference internal" href="../types/krb5_keyusage.html#krb5_keyusage" title="krb5_keyusage">krb5_keyusage</a><em> usage</em>, const <a class="reference internal" href="../types/krb5_data.html#krb5_data" title="krb5_data">krb5_data</a> *<em> cipher_state</em>, const <a class="reference internal" href="../types/krb5_enc_data.html#krb5_enc_data" title="krb5_enc_data">krb5_enc_data</a> *<em> input</em>, <a class="reference internal" href="../types/krb5_data.html#krb5_data" title="krb5_data">krb5_data</a> *<em> output</em><big>)</big><a class="headerlink" href="#krb5_c_decrypt" title="Permalink to this definition">¶</a></dt>
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<tr class="field-odd field"><th class="field-name">param:</th><td class="field-body"><p class="first"><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 <tt class="xref py py-data docutils literal"><span class="pre">KRB5_KEYUSAGE</span></tt> types)</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 class="last"><strong>[out]</strong> <strong>output</strong> - Decrypted data</p>
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<li>0 Success; otherwise - Kerberos error codes</li>
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<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="first admonition-title">Note</p>
<p class="last">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 <a class="reference internal" href="#krb5_c_decrypt" title="krb5_c_decrypt"><tt class="xref c c-func docutils literal"><span class="pre">krb5_c_decrypt()</span></tt></a> trim <em>output->length</em> . For some enctypes, the resulting <em>output->length</em> may include padding bytes.</p>
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