crypto: Refactor nif code to use EVP interface

Using the generic EVP_* API makes it possible to unify
algorithm-specific nif functions to a single generic
function. Effectively the same change that took place on the Erlang
API in R16B01 is now applied to the C code.

The old implementation using the low-level API is kept
for compiling against old OpenSSL,
as parts of the EVP API were introduced in OpenSSL 1.0.0.

There are various minor improvements as well:
- supported algorithms are now provided by the nif code (not a mix of
  the C and Erlang code)
- remove unnecessary variables and macro definitions

Most of the changes in this commit comes from Dániel Szoboszlay
https://github.com/dszoboszlay/otp/commit/07f7056f955b324df4ace
which is part of his 'fips' branch.

Now also rebased on master branch.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/crypto/c_src/crypto_callback.c b/lib/crypto/c_src/crypto_callback.c
index e0de16074c..aab43232c9 100644
--- a/lib/crypto/c_src/crypto_callback.c
+++ b/lib/crypto/c_src/crypto_callback.c
@@ -51,8 +51,6 @@
 DLLEXPORT struct crypto_callbacks* get_crypto_callbacks(int nlocks);
 
 
-static ErlNifRWLock** lock_vec = NULL; /* Static locks used by openssl */
-
 static void nomem(size_t size, const char* op)
 {
     fprintf(stderr, "Out of memory abort. Crypto failed to %s %zu bytes.\r\n",
@@ -84,6 +82,8 @@ static void crypto_free(void* ptr)
 
 #ifdef OPENSSL_THREADS /* vvvvvvvvvvvvvvv OPENSSL_THREADS vvvvvvvvvvvvvvvv */
 
+static ErlNifRWLock** lock_vec = NULL; /* Static locks used by openssl */
+
 #include <openssl/crypto.h>
 
 static INLINE void locking(int mode, ErlNifRWLock* lock)