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<p dir="auto">macOS's libcrypto does not contain the define <code>EVP_CTRL_GCM_SET_TAG</code> (I looked in every SDK from 10.9 to 10.13) yet we see <a href="https://gitlab.com/search?utf8=%E2%9C%93&search=EVP_CTRL_GCM_SET_TAG&group_id=&project_id=179611&search_code=true&repository_ref=master#L142">https://gitlab.com/search?utf8=%E2%9C%93&search=EVP_CTRL_GCM_SET_TAG&group_id=&project_id=179611&search_code=true&repository_ref=master#L142</a></p>
<p dir="auto">Leading to:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">cipher-openssl-compat.c:142:29: error: use of undeclared identifier 'EVP_CTRL_GCM_SET_TAG'</span>
<span id="LC2" class="line" lang="plaintext"> EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, tag_size, </span>
<span id="LC3" class="line" lang="plaintext"> ^</span></code></pre>
<p dir="auto">I am working around it by forcing it to detect this fact via the following patch:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">--- work/configure.ac.orig 2018-12-20 15:18:12.000000000 -0600</span>
<span id="LC2" class="line" lang="plaintext">+++ work/configure.ac 2018-11-30 23:21:11.000000000 -0600</span>
<span id="LC3" class="line" lang="plaintext">@@ -344,7 +344,7 @@</span>
<span id="LC4" class="line" lang="plaintext"></span>
<span id="LC5" class="line" lang="plaintext"> # check for libcrypto - used in test programs</span>
<span id="LC6" class="line" lang="plaintext"> AC_LIB_HAVE_LINKFLAGS(crypto,, [#include <openssl/evp.h></span>
<span id="LC7" class="line" lang="plaintext">-], [EVP_CIPHER_CTX_ctrl(NULL, EVP_CTRL_GCM_SET_TAG, 0, NULL);])</span>
<span id="LC8" class="line" lang="plaintext">+], [EVP_CIPHER_CTX_init(NULL);])</span>
<span id="LC9" class="line" lang="plaintext"></span>
<span id="LC10" class="line" lang="plaintext"> AM_CONDITIONAL(HAVE_LIBCRYPTO, test "$HAVE_LIBCRYPTO" = "yes")</span>
<span id="LC11" class="line" lang="plaintext"></span>
<span id="LC12" class="line" lang="plaintext">--- work/configure.orig 2018-12-20 15:19:38.000000000 -0600</span>
<span id="LC13" class="line" lang="plaintext">+++ work/configure 2018-12-20 15:20:33.000000000 -0600</span>
<span id="LC14" class="line" lang="plaintext">@@ -15730,7 +15730,7 @@</span>
<span id="LC15" class="line" lang="plaintext"> int</span>
<span id="LC16" class="line" lang="plaintext"> main ()</span>
<span id="LC17" class="line" lang="plaintext"> {</span>
<span id="LC18" class="line" lang="plaintext">-EVP_CIPHER_CTX_init(NULL);</span>
<span id="LC19" class="line" lang="plaintext">+EVP_CIPHER_CTX_ctrl(NULL, EVP_CTRL_GCM_SET_TAG, 0, NULL);</span>
<span id="LC20" class="line" lang="plaintext"> ;</span>
<span id="LC21" class="line" lang="plaintext"> return 0;</span>
<span id="LC22" class="line" lang="plaintext"> }</span></code></pre>
<p dir="auto">.. but this means that we do not test this compatibility feature on macOS, which is unfortunate.</p>
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