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<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="Link to this heading">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_c_decrypt_iov">
<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_iov</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">keyblock</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>, <a class="reference internal" href="../types/krb5_crypto_iov.html#c.krb5_crypto_iov" title="krb5_crypto_iov"><span class="n"><span class="pre">krb5_crypto_iov</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">data</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n"><span class="pre">num_data</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_c_decrypt_iov" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param<span class="colon">:</span></dt>
<dd class="field-odd"><p><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 KRB5_KEYUSAGE macros)</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><strong>[in]</strong> <strong>num_data</strong> - Size of <em>data</em></p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval<span class="colon">:</span></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>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="admonition-title">See also</p>
<p>krb5_c_decrypt_iov()</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>On return from a krb5_c_decrypt_iov() call, the <em>data->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>
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