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  <div class="section" id="krb5-c-decrypt-iov-decrypt-data-in-place-supporting-aead-operates-on-keyblock">
<h1>krb5_c_decrypt_iov -  Decrypt data in place supporting AEAD (operates on keyblock).<a class="headerlink" href="#krb5-c-decrypt-iov-decrypt-data-in-place-supporting-aead-operates-on-keyblock" title="Permalink to this headline"></a></h1>
<dl class="function">
<dt id="c.krb5_c_decrypt_iov">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code">krb5_error_code</a> <tt class="descname">krb5_c_decrypt_iov</tt><big>(</big><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context">krb5_context</a><em>&nbsp;context</em>, const <a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock">krb5_keyblock</a> *<em>&nbsp;keyblock</em>, <a class="reference internal" href="../types/krb5_keyusage.html#c.krb5_keyusage" title="krb5_keyusage">krb5_keyusage</a><em>&nbsp;usage</em>, const <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data">krb5_data</a> *<em>&nbsp;cipher_state</em>, <a class="reference internal" href="../types/krb5_crypto_iov.html#c.krb5_crypto_iov" title="krb5_crypto_iov">krb5_crypto_iov</a> *<em>&nbsp;data</em>, size_t<em>&nbsp;num_data</em><big>)</big><a class="headerlink" href="#c.krb5_c_decrypt_iov" title="Permalink to this definition"></a></dt>
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<table class="docutils field-list" frame="void" rules="none">
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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>keyblock</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>[in]</strong> <strong>cipher_state</strong> - Cipher state; specify NULL if not needed</p>
<p><strong>[inout]</strong> <strong>data</strong> - IOV array. Modified in-place.</p>
<p class="last"><strong>[in]</strong> <strong>num_data</strong> - Size of <em>data</em></p>
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<tr class="field-odd field"><th class="field-name">retval:</th><td class="field-body"><ul class="first last simple">
<li>0   Success; otherwise - Kerberos error codes</li>
</ul>
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<p>This function decrypts the data block <em>data</em> and stores the output in-place. The actual decryption key will be derived from <em>keyblock</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. The caller must allocate the right number of krb5_crypto_iov structures before calling into this API.</p>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="#c.krb5_c_decrypt_iov" title="krb5_c_decrypt_iov"><tt class="xref c c-func docutils literal"><span class="pre">krb5_c_decrypt_iov()</span></tt></a></p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>On return from a <a class="reference internal" href="#c.krb5_c_decrypt_iov" title="krb5_c_decrypt_iov"><tt class="xref c c-func docutils literal"><span class="pre">krb5_c_decrypt_iov()</span></tt></a> call, the <em>data-&gt;length</em> in the iov structure are adjusted to reflect actual lengths of the ciphertext used. For example, if the padding length is too large, the length will be reduced. Lengths are never increased.</p>
<p class="last">This function is similar to <a class="reference internal" href="krb5_k_decrypt_iov.html#c.krb5_k_decrypt_iov" title="krb5_k_decrypt_iov"><tt class="xref c c-func docutils literal"><span class="pre">krb5_k_decrypt_iov()</span></tt></a> , but operates on keyblock <em>keyblock</em> .</p>
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