Add support for SM2, SM3 and SM4 #40
Description
Summary
Add support for SM2, SM3 and SM4:
- https://www.openssl.org/docs/man1.1.1/man7/SM2.html and (WIP) An implementation of the Chinese SM2 ECC openssl/openssl#4793
- https://www.openssl.org/docs/man1.1.1/man3/EVP_sm3.html and An implementation of the Chinese SM3 hash algorithm openssl/openssl#4616
- https://www.openssl.org/docs/man1.1.1/man3/EVP_sm4_ecb.html