Added PRIVATE_D version of rsa private key operation for SP
implementation for specific platforms.
WC_NO_RNG results in warnings when RNG calls don't do anything.
Added ifdef checks for variables not used otherwise.
Remove superfluous if statements like when checking ret == 0.
Change names of globals that are generic and are used locally before
global definition.
Remove definition of variable len that isn't used except as a
replacement for sz which is parameter.
Don't subtract two variables when one has just been assigned the value
of the other.
Fix shifting of signed value.
Fix parameter checking in aes.c and des3.c for platform specific code.
* Added support for running as only Client (`-c`) or Server (`-s`).
* Added support for using sockets (in addition to in memory mode `-m`).
* Fixed support for 16KB test packet (memory version needed TLS header space). Changed to default to 16KB.
* Fixed so transfer is done on each connection and there is not transfer limit (instead "shutdown" message is used).
* Made pthread support optional and based on HAVE_PTHREAD.
* Tested non-blocking support with sockets or shared memory.
To use with localhost sockets and threading use `./examples/benchmark/tls_bench`
To use with threading and in-memory use `./examples/benchmark/tls_bench -m`
To use as separate server client applications with localhost sockets use: `./examples/benchmark/tls_bench -s` and `./examples/benchmark/tls_bench -c` in separate terminals.
```
./examples/benchmark/tls_bench -?
tls_bench 3.15.7 NOTE: All files relative to wolfSSL home dir
-? Help, print this usage
-c Run as client only, no threading and uses sockets
-s Run as server only, no threading and uses sockets
-h Host (default localhost)
-P Port (default 11112)
-e List Every cipher suite available
-i Show peer info
-l <str> Cipher suite list (: delimited)
-t <num> Time <num> (seconds) to run each test (default 1)
-p <num> The packet size <num> in bytes [1-16kB] (default 16384)
-v Show verbose output
-d Enable debug messages
-T <num> Number of threaded server/client pairs (default 1)
-m Use local memory, not socket
```
Fix states in TLS 1.3 connect and accept to be monotonically increasing
by 1.
Always have a new state after a buffer is constructed to be sent.
Add non-blocking support into TLS benchmark and support TLS 1.3.
* Added new internal function `wolfSSL_GetMaxRecordSize`.
* Modified tls_bench to use dynamic buffer based on max record size.
* Added comment for DTLS maxFragment calculation.
* Feature update for tls_bench test that will allow passing in command line arguments that enable test features.
* Fix type conversion errors.
* Fixed use of uninitialized data. Declare DH arrays as const.
* Fixed some `tls_bench` build issues with various configure options.
* Moved the `WOLFSSL_PACK` and `WC_NORETURN` macros into types.h.
* Added support for `__builtin_bswap32` and `__builtin_bswap64`. Since the performance of the builtins varries by platform its off by default, but can be enabled by customer using `WOLF_ALLOW_BUILTIN`. Quick check on x86 showed the 32-bit swap performance matched, but 64-bit swap was slower.
