remove unused locking functions (#4780)

* remove unused locking functions

we do all this in C when necessary

* oops, need this

src/_cffi_src/openssl/crypto.py

@@ -27,22 +27,15 @@
 static const int CRYPTO_MEM_CHECK_OFF;
 static const int CRYPTO_MEM_CHECK_ENABLE;
 static const int CRYPTO_MEM_CHECK_DISABLE;
-static const int CRYPTO_LOCK;
-static const int CRYPTO_UNLOCK;
-static const int CRYPTO_READ;
-static const int CRYPTO_LOCK_SSL;
 """
 
 FUNCTIONS = """
 int CRYPTO_mem_ctrl(int);
 
-void CRYPTO_cleanup_all_ex_data(void);
 void OPENSSL_cleanup(void);
 
-/* as of 1.1.0 OpenSSL does its own locking *angelic chorus*. These functions
-   have become macros that are no ops */
-int CRYPTO_num_locks(void);
-void CRYPTO_set_locking_callback(void(*)(int, int, const char *, int));
+/* as of 1.1.0 OpenSSL does its own locking *angelic chorus*. This function
+   is now a noop macro. We can delete this once we drop 1.0.2 support. */
 void (*CRYPTO_get_locking_callback(void))(int, int, const char *, int);
 
 /* SSLeay was removed in 1.1.0 */
@@ -56,8 +49,6 @@
 void *OPENSSL_malloc(size_t);
 void OPENSSL_free(void *);
 
-/* This was removed in 1.1.0 */
-void CRYPTO_lock(int, int, const char *, int);
 
 /* Signature changed significantly in 1.1.0, only expose there for sanity */
 int Cryptography_CRYPTO_set_mem_functions(
@@ -98,19 +89,6 @@
 static const long Cryptography_HAS_LOCKING_CALLBACKS = 1;
 #else
 static const long Cryptography_HAS_LOCKING_CALLBACKS = 0;
-#if !defined(CRYPTO_LOCK)
-static const long CRYPTO_LOCK = 0;
-#endif
-#if !defined(CRYPTO_UNLOCK)
-static const long CRYPTO_UNLOCK = 0;
-#endif
-#if !defined(CRYPTO_READ)
-static const long CRYPTO_READ = 0;
-#endif
-#if !defined(CRYPTO_LOCK_SSL)
-static const long CRYPTO_LOCK_SSL = 0;
-#endif
-void (*CRYPTO_lock)(int, int, const char *, int) = NULL;
 #endif
 
 #if CRYPTOGRAPHY_OPENSSL_LESS_THAN_110

src/cryptography/hazmat/bindings/openssl/_conditional.py

@@ -150,11 +150,6 @@ def cryptography_has_tls_st():
 
 def cryptography_has_locking_callbacks():
     return [
-        "CRYPTO_LOCK",
-        "CRYPTO_UNLOCK",
-        "CRYPTO_READ",
-        "CRYPTO_LOCK_SSL",
-        "CRYPTO_lock",
         "Cryptography_setup_ssl_threads",
     ]