SM2椭圆曲线公钥密码算法。第4部分：公钥加密算法-SM2 elliptic curve public key cryptography algorithms. Part 4: public key encryption algorithm

能实现椭圆曲线密码的加密解密过程，功能齐全，易于实现-Can realize the elliptic curve cryptography decipher process, function is complete, easy to realize