bpo-30102: Call OPENSSL_add_all_algorithms_noconf (#3112)

The ssl and hashlib modules now call OPENSSL_add_all_algorithms_noconf() on
OpenSSL < 1.1.0. The function detects CPU features and enables optimizations
on some CPU architectures such as POWER8. Patch is based on research from
Gustavo Serra Scalet.

Signed-off-by: Christian Heimes <christian@python.org>

Misc/NEWS.d/next/Library/2017-08-16-21-14-31.bpo-30102.1sPqmc.rst

@@ -0,0 +1,4 @@
+The ssl and hashlib modules now call OPENSSL_add_all_algorithms_noconf() on
+OpenSSL < 1.1.0. The function detects CPU features and enables optimizations
+on some CPU architectures such as POWER8. Patch is based on research from
+Gustavo Serra Scalet.

Modules/_hashopenssl.c

@@ -1022,8 +1022,11 @@ PyInit__hashlib(void)
 {
     PyObject *m, *openssl_md_meth_names;
 
-    OpenSSL_add_all_digests();
+#ifndef OPENSSL_VERSION_1_1
+    /* Load all digest algorithms and initialize cpuid */
+    OPENSSL_add_all_algorithms_noconf();
     ERR_load_crypto_strings();
+#endif
 
     /* TODO build EVP_functions openssl_* entries dynamically based
      * on what hashes are supported rather than listing many

Modules/_ssl.c

@@ -5181,9 +5181,14 @@ PyInit__ssl(void)
         return NULL;
     PySocketModule = *socket_api;
 
+#ifndef OPENSSL_VERSION_1_1
+    /* Load all algorithms and initialize cpuid */
+    OPENSSL_add_all_algorithms_noconf();
     /* Init OpenSSL */
     SSL_load_error_strings();
     SSL_library_init();
+#endif
+
 #ifdef WITH_THREAD
 #ifdef HAVE_OPENSSL_CRYPTO_LOCK
     /* note that this will start threading if not already started */
@@ -5195,7 +5200,6 @@ PyInit__ssl(void)
     _ssl_locks_count++;
 #endif
 #endif  /* WITH_THREAD */
-    OpenSSL_add_all_algorithms();
 
     /* Add symbols to module dict */
     sslerror_type_slots[0].pfunc = PyExc_OSError;