# 创建CA
每个用户可以创建100个CA。
创建私有CA相关参数详情请参见[创建CA参数说明](https://support.huaweicloud.com/api-ccm/CreateCertificateAuthority.html)。
```
import com.huaweicloud.sdk.ccm.v1.CcmClient;
import com.huaweicloud.sdk.ccm.v1.model.CreateCertificateAuthorityRequest;
import com.huaweicloud.sdk.ccm.v1.model.CreateCertificateAuthorityRequestBody;
import com.huaweicloud.sdk.ccm.v1.model.CreateCertificateAuthorityResponse;
import com.huaweicloud.sdk.ccm.v1.model.CrlConfiguration;
import com.huaweicloud.sdk.ccm.v1.model.DistinguishedName;
import com.huaweicloud.sdk.ccm.v1.model.Validity;
import com.huaweicloud.sdk.core.auth.GlobalCredentials;
/**
 * 创建CA
 */
public class CreateCertificateAuthorityExample {
    /**
     * 基础认证信息：
     * - ACCESS_KEY: 华为云账号Access Key
     * - SECRET_ACCESS_KEY: 华为云账号Secret Access Key
     * - DOMAIN_ID: 华为云账号ID
     * - CCM_ENDPOINT: 华为云CCM服务(PCA属于CCM下的微服务)访问终端地址
     * 认证使用的ak和sk硬编到代码中或明文存储存在较大安全风险，建议在配置文件或环境变量中密文存放，使用时解密，确保安全；
     * 本示例ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量HUAWEICLOUD_SDK_AK和HUAWEICLOUD_SDK_SK。
     */
    private static final String ACCESS_KEY = System.getenv("HUAWEICLOUD_SDK_AK");
    private static final String SECRET_ACCESS_KEY =  System.getenv("HUAWEICLOUD_SDK_SK");
    private static final String DOMAIN_ID = "<DomainID>";
    private static final String CCM_ENDPOINT = "<CcmEndpoint>";
    public static void main(String[] args) {
        // 1.准备访问华为云的认证信息，PCA为全局服务
        final GlobalCredentials auth = new GlobalCredentials()
                .withAk(ACCESS_KEY)
                .withSk(SECRET_ACCESS_KEY)
                .withDomainId(DOMAIN_ID);
        // 2.初始化SDK，传入认证信息及CCM服务的访问终端地址
        final CcmClient ccmClient = CcmClient.newBuilder()
                .withCredential(auth)
                .withEndpoint(CCM_ENDPOINT).build();
        // 3、构造请求参数
        // （1）需要创建的CA证书类型:ROOT（根CA）、SUBORDINATE（从属CA）
        String CAType = "ROOT";
        // （2）CA密钥算法
        String keyAlgorithm = "RSA2048";
        // （3）签名哈希算法
        String signatureAlgorithm = "SHA512";
        /*
         * （4）CA有效期定义
         * - type: 时间类型，可选："YEAR"、"MONTH"、"DAY"、"HOUR"
         * - value: 对应的值
         */
        Validity validity = new Validity();
        validity.setType("YEAR");
        validity.setValue(20);
        /*
         * （5）定义CA的唯一标识信息
         * - organization: 组织名称
         * - organizationalUnit: 部门名称
         * - country: 国家缩写，仅限两个字符，如中国-CN
         * - state: 省市名称
         * - locality: 城市名称
         * - commonName: CA名称（CN）
         */
        DistinguishedName subjectInfo = new DistinguishedName();
        subjectInfo.setOrganization("your organization");
        subjectInfo.setOrganizationalUnit("your organizational unit");
        subjectInfo.setCountry("CN");
        subjectInfo.setState("your state");
        subjectInfo.setLocality("your locality");
        subjectInfo.setCommonName("your CA name");
        /*
         * （6）吊销列表配置信息
         * - enabled: 是否启用CRL配置
         * - obsBucketName: OBS桶名称，用于发布CRL，需要已授权!!!
         * - crlName: 证书吊销列表文件名，不传入时默认取CA ID作为文件名
         * - validDays: 证书吊销列表更新周期
         */
        CrlConfiguration crlConfiguration = new CrlConfiguration();
        crlConfiguration.setEnabled(false);
        crlConfiguration.setObsBucketName("your OBS buck name");
        crlConfiguration.setCrlName("your CRL file name");
        crlConfiguration.setValidDays(7);
        // （7）请求体各属性赋值
        CreateCertificateAuthorityRequestBody requestBody = new CreateCertificateAuthorityRequestBody();
        requestBody.setType(CAType);
        requestBody.setKeyAlgorithm(keyAlgorithm);
        requestBody.setSignatureAlgorithm(signatureAlgorithm);
        requestBody.setValidity(validity);
        requestBody.setDistinguishedName(subjectInfo);
        requestBody.setCrlConfiguration(crlConfiguration);
        // 4、构造请求体
        CreateCertificateAuthorityRequest request = new CreateCertificateAuthorityRequest().withBody(requestBody);
        // 5、开始发起请求
        CreateCertificateAuthorityResponse response;
        try {
            response = ccmClient.createCertificateAuthority(request);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
        // 6、获取创建成功的CA的ID
        String caId = response.getCaId();
        System.out.println(caId);
    }
}
```