This fixes hash based dir lookup of ASN1/DER CRLs in OpenSSL
compatible API. The function wolfSSL_X509_load_crl_file is
called with entry->dir_type, rather than hardcoded filetype.
A new test crl was added, and existing crl 0fdb2da4.r0 was
reorganized to a new dir.
Also, completes the stub wolfSSL_X509_LOOKUP_add_dir. A new
test function test_X509_LOOKUP_add_dir was added to tests/api.c
clang-analyzer-deadcode.DeadStores in examples/server/server.c;
-Werror=use-after-free and LeakSanitizer Direct leak in tests/api.c;
nullPointerRedundantCheck in src/pk.c which identified a semantically consequential flub.
In configure.ac and CMakeLists.txt, check for the header
Security/SecTrustSettings.h. If this header is found, enable the feature. If
it isn't, disable it. For non-configure/non-CMake builds, require the user to
explicitly define HAVE_SECURITY_SECTRUSTSETTINGS_H if they want to use system
CA certs (handled in settings.h).
Don't ForceZero the output buffer before free.
ForceZero it when encryption fails.
ShrinkInputBuffer needs to zeroize input buffer even if not currently
encrypting as it may be using the buffer on wolfSSL object reuse.
Fix SP to zeroize the whole buffer.
Fix DH to check cBuf when WOLFSSL_CHECK_MEM_ZERO defined.
Reorganized the DH APIs into groups.
Reworked all DH APIs.
Improved testing of DH API.
Implemented wolfSSL_PEM_read_RSAPublicKey() and
wolfSSL_PEM_write_RSA_PUBKEY().
Fix public key PEM write implementations to use the correct
header/footer names.
Added support for "RSA PUBLIC KEY" in header and footer in DerToPemEx().
Reworked PEM read/write APIs to be independent. No longer create an EVP
to use common function - common functionality refectored out.
Similarly file APIs don't create a BIO and call the partner APIs.
Improved testing of PEM read/write APIs.
Generic read BIO from memory BIO now returns the buffer instead of
allocating memory and reading.
No longer reading chunks when a file BIO.
Added wolfssl_make_rng() to create or get get global random. All RSA and
DH APIs now use this. DH_generate_parameters() creates a random object
and use global on error rather than just using global random.
Changed implementations to use BIO_new_fp() instead of create a new BIO
and setting file pointer.
