M_check_autoarg
M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)