int pkey_ctrl_string(EVP_PKEY_CTX *ctx, char *value)
	{
	int rv;
	char *stmp, *vtmp = NULL;
	stmp = BUF_strdup(value);
	if (!stmp)
		return -1;
	vtmp = strchr(stmp, ':');
	if (vtmp)
		{
		*vtmp = 0;
		vtmp++;
		}
	rv = EVP_PKEY_CTX_ctrl_str(ctx, stmp, vtmp);
	OPENSSL_free(stmp);
	return rv;
	}
int pkey_ctrl_string(EVP_PKEY_CTX *ctx, char *value)
	{
	int rv;
	char *stmp, *vtmp = NULL;
	stmp = BUF_strdup(value);
	if (!stmp)
		return -1;
	vtmp = strchr(stmp, ':');
	if (vtmp)
		{
		*vtmp = 0;
		vtmp++;
		}
	rv = EVP_PKEY_CTX_ctrl_str(ctx, stmp, vtmp);
	OPENSSL_free(stmp);
	return rv;
	}