The SymCrypt Engine for OpenSSL allows the use of OpenSSL with SymCrypt as the provider for core cryptographic operations. It leverages the OpenSSL engine interface to override the cryptographic implementations in OpenSSL's libcrypto.so with SymCrypt's implementations. The primary motivation for this is to support FIPS certification, as vanilla OpenSSL 1.1.1 does not have a FIPS-certified cryptographic module.
Where possible the SymCrypt engine will direct OpenSSL API calls to the SymCrypt module. In cases where SymCrypt cannot (currently) support an OpenSSL API, the best effort is made to fall-back to the default OpenSSL implementation of the given function. In a few cases the engine will instead fail the call completely, as re-routing to OpenSSL's implementation is not always easy, and as with any project we have to prioritize!
The known cases where the Engine will currently fail rather than fallback to the default OpenSSL implementation are:
- Use of an AES-GCM IV which is not 12-bytes (192-bits)
- Use of unsupported digests in RSA signatures and TLS PRF
- Use of multi-prime (more than 2-prime) RSA
Important note: The code in this repository is currently undergoing validation for use in Microsoft-internal products. At this time, it has not been tested for use in other environments and should not be considered production-ready.
Follow Linux build instructions from SymCrypt repository SymCrypt to build the Linux SymCrypt module.
cp <SymCryptRepo>/bin/module/<arch>/LinuxUserMode/libsymcrypt.so ./
cmake .
make
cd SslPlay
./SslPlay
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