---
title: "Sign Sub Csr"
slug: "sign-sub-csr"
tags: ["Private CA"]
updated: 2026-09-17T10:25:43Z
published: 2026-09-17T10:25:43Z
canonical: "api.ncloud-docs.com/sign-sub-csr"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://api.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign Sub Csr

Available in Classic and VPC

Issue a certificate to perform the role of an intermediate CA using a CA certificate.

## Request

The following describes the request format for the endpoint. The request format is as follows:

| Method | URI |
| --- | --- |
| POST | /api/v1/ca/{caTag}/sub/sign |

### Request headers

For information about the headers common to all CA APIs, see [CA request headers](/docs/en/security-privateca#%EC%9A%94%EC%B2%AD%ED%97%A4%EB%8D%94).

### Request path parameters

You can use the following path parameters with your request:

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `caTag` | String | Required | CA tag value - See [Get CA list](/docs/en/security-privateca-getcalist) |

### Request body

The following describes the request body.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `period` | String | Required | Validity period (days) - 1 - 3650 |
| `csrPem` | String | Required | CSR (PEM) - Enter a newline character (`\n`) after `-----BEGIN CERTIFICATE REQUEST-----` and in front of `-----END CERTIFICATE REQUEST-----` |

### Request example

The following is a sample request.

```
curl --location --request POST 'https://pca.apigw.ntruss.com/api/v1/ca/********-********/sub/sign' \
--header 'x-ncp-apigw-timestamp: {Timestamp}' \
--header 'x-ncp-iam-access-key: {Access Key}' \
--header 'x-ncp-apigw-signature-v2: {API Gateway Signature}' \
--header 'Content-Type: application/json' \
--data '{
    "period": "10",
    "csrPem": "-----BEGIN CERTIFICATE REQUEST-----\n{CSR}\n-----END CERTIFICATE REQUEST-----"
}'
```

## Response

The following describes the response format.

### Response body

The following describes the response body.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `certificate` | String | - | CA certificate (PEM) |
| `caChain` | Array | - | Certificate chain (PEM) |
| `ocspResponder` | String | - | Online Certificate Status Protocol (OCSP) URL |
| `issuer` | String | - | Issuing CA (PEM) |
| `serialNo` | String | - | Certificate serial number |

### Response status codes

For information about the HTTP status codes common to all CA APIs, see [CA response status codes](/docs/en/security-privateca#%EC%9D%91%EB%8B%B5%EC%83%81%ED%83%9C%EC%BD%94%EB%93%9C).

### Response example

The following is a sample example.

```
{
    "code": "SUCCESS",
    "msg": "Success",
    "data": {
        "certificate": "-----BEGIN CERTIFICATE-----\n{Certificate}\n-----END CERTIFICATE-----",
        "caChain": [
            "-----BEGIN CERTIFICATE-----\n{CA Chain}\n-----END CERTIFICATE-----",
            "-----BEGIN CERTIFICATE-----\n{CA Chain}\n-----END CERTIFICATE-----",
            "-----BEGIN CERTIFICATE-----\n{CA Chain}\n-----END CERTIFICATE-----"
        ],
        "ocspResponder": "",
        "issuer": "-----BEGIN CERTIFICATE-----\n{CA}\n-----END CERTIFICATE-----",
        "serialNo": "**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**"
    }
}
```