# 证书链对象的创建和校验

以校验证书链为例，完成证书链对象的创建，获取证书链中的证书列表以及使用信任锚对证书链进行校验。

#### 开发步骤

1.  导入证书模块。
    
    ```
    import { cert } from '@kit.DeviceCertificateKit';
    ```
    
2.  基于已有的证书数据，调用cert.createX509CertChain创建X.509证书链对象，并返回结果。
    
3.  调用x509CertChain.getCertList获取证书链中的X.509证书列表。
    
4.  调用x509CertChain.validate使用校验参数校验证书链并返回结果。
    

```
import { cert } from '@kit.DeviceCertificateKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { util } from '@kit.ArkTS';

let certChainData = '-----BEGIN CERTIFICATE-----\n' +
  'MIID6jCCAtKgAwIBAgIIIM2q/TmRoLcwDQYJKoZIhvcNAQELBQAwWjELMAkGA1UE\n' +
  'BhMCRU4xEDAOBgNVBAgTB0VuZ2xhbmQxDzANBgNVBAcTBkxvbmRvbjEMMAoGA1UE\n' +
  'ChMDdHMyMQwwCgYDVQQLEwN0czIxDDAKBgNVBAMTA3RzMjAeFw0yMzEyMDUwNzM5\n' +
  'MDBaFw0yNDEwMzEyMzU5MDBaMGExCzAJBgNVBAYTAkNOMRAwDgYDVQQIEwdKaWFu\n' +
  'Z3N1MRAwDgYDVQQHEwdOYW5qaW5nMQwwCgYDVQQKEwN0czMxDDAKBgNVBAsTA3Rz\n' +
  'MzESMBAGA1UEAxMJMTI3LjAuMC4xMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB\n' +
  'CgKCAQEAtt+2QxUevbolYLp51QGcUpageI4fwGLIqv4fj4aoVnHFOOBqVOVpfCLR\n' +
  'p26LFV/F8ebwPyo8YEBKSwXzMD1573rMSbaH9BalscH5lZYAbetXoio6YRvzlcmc\n' +
  'rVvLBNMeVnxY86xHpo0MTNyP7W024rZsxWO98xFQVdoiaBC+7+midlisx2Y+7u0j\n' +
  'zT9GjeUP6JLdLFUZJKUPSTK3jVzw9v1eZQZKYoNfU6vFMd6ndtwW6qEnwpzmmX/U\n' +
  'T+p5ThAMH593zszlz330nTSXBjIsGkyvOz9gSB0Z0LAuJj06XUNhGL5xKJYKbdI3\n' +
  '8MFQFJKvRHfgTAvVsvAvpBUM2DuBKwIDAQABo4GsMIGpMAkGA1UdEwQCMAAwHQYD\n' +
  'VR0OBBYEFDfsHTMZwoA6eaDFlBUyDpka+sYtMAsGA1UdDwQEAwID+DAnBgNVHSUE\n' +
  'IDAeBggrBgEFBQcDAQYIKwYBBQUHAwIGCCsGAQUFBwMEMBQGA1UdEQQNMAuCCTEy\n' +
  'Ny4wLjAuMTARBglghkgBhvhCAQEEBAMCBkAwHgYJYIZIAYb4QgENBBEWD3hjYSBj\n' +
  'ZXJ0aWZpY2F0ZTANBgkqhkiG9w0BAQsFAAOCAQEAp5vTvXrt8ZpgRJVtzv9ss0lJ\n' +
  'izp1fJf+ft5cDXrs7TSD5oHrSW2vk/ZieIMhexU4LFwhs4OE7jK6pgI48Dseqxx7\n' +
  'B/KktxhVMJUmVXd9Ayjp6f+BtZlIk0cArPuoXToXjsV8caTGBXHRdzxpAk/w9syc\n' +
  'GYrbH9TrdNMuTizOb+k268oKXUageZNxHmd7YvOXkcNgrd29jzwXKDYYiUa1DISz\n' +
  'DnYaJOgPt0B/5izhoWNK7GhJDy9KEuLURcTSWFysbbnljwO9INPT9MmlS83PdAgN\n' +
  'iS8VXF4pce1W9U5jH7d7k0JDVSXybebe1iPFphsZpYM/NE+jap+mPy1nTCbf9g==\n' +
  '-----END CERTIFICATE-----\n' +
  '-----BEGIN CERTIFICATE-----\n' +
  'MIIC0zCCAoWgAwIBAgIIXpLoPpQVWnkwBQYDK2VwMFoxCzAJBgNVBAYTAkVOMRAw\n' +
  'DgYDVQQIEwdFbmdsYW5kMQ8wDQYDVQQHEwZMb25kb24xDDAKBgNVBAoTA3RzMTEM\n' +
  'MAoGA1UECxMDdHMxMQwwCgYDVQQDEwN0czEwHhcNMjMxMjA1MDczNzAwWhcNMjQw\n' +
  'OTAxMjM1OTAwWjBaMQswCQYDVQQGEwJFTjEQMA4GA1UECBMHRW5nbGFuZDEPMA0G\n' +
  'A1UEBxMGTG9uZG9uMQwwCgYDVQQKEwN0czIxDDAKBgNVBAsTA3RzMjEMMAoGA1UE\n' +
  'AxMDdHMyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtt+2QxUevbol\n' +
  'YLp51QGcUpageI4fwGLIqv4fj4aoVnHFOOBqVOVpfCLRp26LFV/F8ebwPyo8YEBK\n' +
  'SwXzMD1573rMSbaH9BalscH5lZYAbetXoio6YRvzlcmcrVvLBNMeVnxY86xHpo0M\n' +
  'TNyP7W024rZsxWO98xFQVdoiaBC+7+midlisx2Y+7u0jzT9GjeUP6JLdLFUZJKUP\n' +
  'STK3jVzw9v1eZQZKYoNfU6vFMd6ndtwW6qEnwpzmmX/UT+p5ThAMH593zszlz330\n' +
  'nTSXBjIsGkyvOz9gSB0Z0LAuJj06XUNhGL5xKJYKbdI38MFQFJKvRHfgTAvVsvAv\n' +
  'pBUM2DuBKwIDAQABo28wbTAMBgNVHRMEBTADAQH/MB0GA1UdDgQWBBQ37B0zGcKA\n' +
  'OnmgxZQVMg6ZGvrGLTALBgNVHQ8EBAMCAQYwEQYJYIZIAYb4QgEBBAQDAgAHMB4G\n' +
  'CWCGSAGG+EIBDQQRFg94Y2EgY2VydGlmaWNhdGUwBQYDK2VwA0EAuasLBe55YgvF\n' +
  'b4wmHeohylc9r8cFGS1LNQ5UcSn3sGqMYf6ehnef16NLuCW6upHCs8Sui4iAMvsP\n' +
  'uKPWR9dKBA==\n' +
  '-----END CERTIFICATE-----\n' +
  '-----BEGIN CERTIFICATE-----\n' +
  'MIIB3zCCAZGgAwIBAgIIWQvOEDl+ya4wBQYDK2VwMFoxCzAJBgNVBAYTAkVOMRAw\n' +
  'DgYDVQQIEwdFbmdsYW5kMQ8wDQYDVQQHEwZMb25kb24xDDAKBgNVBAoTA3RzMTEM\n' +
  'MAoGA1UECxMDdHMxMQwwCgYDVQQDEwN0czEwHhcNMjMxMjA1MDAwMDAwWhcNMjQx\n' +
  'MjA0MjM1OTU5WjBaMQswCQYDVQQGEwJFTjEQMA4GA1UECBMHRW5nbGFuZDEPMA0G\n' +
  'A1UEBxMGTG9uZG9uMQwwCgYDVQQKEwN0czExDDAKBgNVBAsTA3RzMTEMMAoGA1UE\n' +
  'AxMDdHMxMCowBQYDK2VwAyEAuxadj1ww0LqPN24zr28jcSOlSWAe0QdLyRF+ZgG6\n' +
  'klKjdTBzMBIGA1UdEwEB/wQIMAYBAf8CARQwHQYDVR0OBBYEFNSgpoQvfxR8A1Y4\n' +
  'St8NjOHkRpm4MAsGA1UdDwQEAwIBBjARBglghkgBhvhCAQEEBAMCAAcwHgYJYIZI\n' +
  'AYb4QgENBBEWD3hjYSBjZXJ0aWZpY2F0ZTAFBgMrZXADQQAblBgoa72X/K13WOvc\n' +
  'KW0fqBgFKvLy85hWD6Ufi61k4ProQiZzMK+0+y9jReKelPx/zRdCCgSbQroAR2mV\n' +
  'xjoE\n' +
  '-----END CERTIFICATE-----\n';

async function sample() {
  let textEncoder = new util.TextEncoder();
  // 证书链二进制数据，需业务自行赋值。
  const encodingBlob: cert.EncodingBlob = {
    data: textEncoder.encodeInto(certChainData),
    // 根据encodingData的格式进行赋值，支持FORMAT_PEM、FORMAT_DER和FORMAT_PKCS7。
    encodingFormat: cert.EncodingFormat.FORMAT_PEM
  };
  let x509CertChain: cert.X509CertChain = {} as cert.X509CertChain;
  try {
    x509CertChain = await cert.createX509CertChain(encodingBlob);
  } catch (err) {
    let e: BusinessError = err as BusinessError;
    console.error(`createX509CertChain failed, errCode: ${e.code}, errMsg: ${e.message}`);
  }

  try {
    let certList = x509CertChain.getCertList();
  } catch (err) {
    let e: BusinessError = err as BusinessError;
    console.error(`X509CertChain getCertList failed, errCode: ${e.code}, errMsg: ${e.message}`);
  }

  // 证书链校验数据，需业务自行赋值。
  const param: cert.CertChainValidationParameters = {
    date: '20231212080000Z',
    trustAnchors: [{
      CAPubKey: new Uint8Array([0x30, 0x2a, 0x30, 0x05, 0x06, 0x03, 0x2b, 0x65, 0x70, 0x03, 0x21, 0x00, 0xbb, 0x16,
        0x9d, 0x8f, 0x5c, 0x30, 0xd0, 0xba, 0x8f, 0x37, 0x6e, 0x33, 0xaf, 0x6f, 0x23, 0x71, 0x23, 0xa5, 0x49, 0x60,
        0x1e, 0xd1, 0x07, 0x4b, 0xc9, 0x11, 0x7e, 0x66, 0x01, 0xba, 0x92, 0x52]),
      CASubject: new Uint8Array([0x30, 0x5a, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x45,
        0x4e, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x08, 0x13, 0x07, 0x45, 0x6e, 0x67, 0x6c, 0x61, 0x6e,
        0x64, 0x31, 0x0f, 0x30, 0x0d, 0x06, 0x03, 0x55, 0x04, 0x07, 0x13, 0x06, 0x4c, 0x6f, 0x6e, 0x64, 0x6f, 0x6e,
        0x31, 0x0c, 0x30, 0x0a, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13, 0x03, 0x74, 0x73, 0x31, 0x31, 0x0c, 0x30, 0x0a,
        0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x03, 0x74, 0x73, 0x31, 0x31, 0x0c, 0x30, 0x0a, 0x06, 0x03, 0x55, 0x04,
        0x03, 0x13, 0x03, 0x74, 0x73, 0x31]),
    }]
  };
  try {
    const validationRes = await x509CertChain.validate(param);
    console.info('X509CertChain validate result: success.');
  } catch (err) {
    let e: BusinessError = err as BusinessError;
    console.error(`X509CertChain validate failed, errCode: ${e.code}, errMsg: ${e.message}`);
  }
}
```