OpenSSL SM2 Key Assignment: EVP_PKEY_assign_SM2_KEY Function

EVP_PKEY_assign_SM2_KEY() is a function in the OpenSSL library used to assign an SM2 key pair to an EVP_PKEY structure. This function takes the EVP_PKEY structure and the SM2 key pair as input parameters and assigns the key pair to the EVP_PKEY structure. The EVP_PKEY structure represents a public or private key in OpenSSL. The SM2 key pair consists of a public and private key used for cryptographic operations using the SM2 algorithm. This function is commonly used when working with SM2 keys in OpenSSL-based applications.