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<a href="https://gitlab.com/Vrancken">Tom</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/650#note_121243602">lib/cert-cred-rawpk.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="338" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<td class="diff-line-num new new_line" data-linenumber="339" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Obtains pointers to a public/private key pair that has been stored in</span></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @cred with one of gnutls_certificate_set_key(),</span></span>
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<td class="diff-line-num new new_line" data-linenumber="341" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * gnutls_certificate_set_rawpk_key_mem() or gnutls_certificate_set_rawpk_key_file().</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * The returned keys must NOT be deallocated since they point directly</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to the keys in the credentials struct. With this function you can</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * retrieve, and if desired, overwrite a previously set key pair.</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * A correct @index can be retrieved as the return value from a</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * gnutls_certificate_set_key(), gnutls_certificate_set_rawpk_key_mem()</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * or gnutls_certificate_set_rawpk_key_file() function when the</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * %GNUTLS_CERTIFICATE_API_V2 flag is set.</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * If there is no key with the given index,</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * %GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned. If the public key</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * with the given index is not a raw public key, %GNUTLS_E_INVALID_REQUEST</span></span>
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<blockquote dir="auto" style="color: #7f8fa4; border-left-width: 3px; border-left-color: #eaeaea; border-left-style: solid; margin: 0; padding: 0 0 0 15px;">
<p>So you say it is applicable to both raw and x509. So it is ok.</p>
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<p dir="auto">Yes.</p>
<blockquote dir="auto" style="color: #7f8fa4; border-left-width: 3px; border-left-color: #eaeaea; border-left-style: solid; margin: 0; padding: 0 0 0 15px;">
<p>In that case why do we introduce the special function to get raw keys with no equivalent in the x509 set? Do you have a particular use case for it?</p>
</blockquote>
<p dir="auto">There are equivalent functions for x509 in <code>cert-cred-x509.c</code> called <code>gnutls_certificate_get_x509_key()</code> and <code>gnutls_certificate_get_x509_crt()</code>. My function for retrieving a raw public-key only retrieves both the private key and public key together (i.e. retrieves the key pair). That reduces the number of new API functions and most of the time you want to retrieve both of them anyway. You also set them together so I think it's logical to retrieve them together.</p>
<p dir="auto">If your question is why do we have <code>gnutls_certificate_get_crt_raw()</code>, that I don't know. It was already there.</p>
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