evp_pkey_asym_cipher_init
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT, NULL);
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT, params);
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT, NULL);
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT, params);