导入证书模块。
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```
import { cert } from '@kit.DeviceCertificateKit';
```
签名的开发步骤查看CMS签名。
调用cert.createCmsParser创建CmsParser对象。
调用cmsParser.setRawData设置CMS数据。
调用cmsParser.verifySignedData进行验签。

验签示例：

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import { cert } from '@kit.DeviceCertificateKit';

let ECC_256_PUB_ENTRY_CERT: string =
  '-----BEGIN CERTIFICATE-----\n' +
    'MIICejCCAiCgAwIBAgIUGE371/LcCW79mzMm6UiJdyC4khcwCgYIKoZIzj0EAwIw\n' +
    'fjELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaWppbmcxEDAOBgNVBAcMB0JlaWpp\n' +
    'bmcxHjAcBgNVBAoMFUVDRFNBIEludGVybWVkaWF0ZSBDQTELMAkGA1UECwwCSVQx\n' +
    'HjAcBgNVBAMMFUVDRFNBIEludGVybWVkaWF0ZSBDQTAeFw0yNTA5MjgxMDU0MDVa\n' +
    'Fw0zNTA5MjYxMDU0MDVaMHUxCzAJBgNVBAYTAkNOMRAwDgYDVQQIDAdCZWlqaW5n\n' +
    'MRAwDgYDVQQHDAdCZWlqaW5nMRswGQYDVQQKDBJFQ0RTQSBFeGFtcGxlIENvcnAx\n' +
    'CzAJBgNVBAsMAklUMRgwFgYDVQQDDA93d3cuZXhhbXBsZS5jb20wWTATBgcqhkjO\n' +
    'PQIBBggqhkjOPQMBBwNCAAQNKO5YXAsmdm/ShEU5VyQlQSdnV6hNQIofHhQ/GyeK\n' +
    '1W7t3KnMie4cv/wnA4Qmor2KeBBXUFUnYJqqWOHsivIuo4GEMIGBMAkGA1UdEwQC\n' +
    'MAAwCwYDVR0PBAQDAgK0MCcGA1UdEQQgMB6CD3d3dy5leGFtcGxlLmNvbYILZXhh\n' +
    'bXBsZS5jb20wHQYDVR0OBBYEFD7RUSUimy0SWShmPIus91tDS0u9MB8GA1UdIwQY\n' +
    'MBaAFFjgVG0DwmSwxzJWELNvxGtm3mxUMAoGCCqGSM49BAMCA0gAMEUCIQCTw7sx\n' +
    'X0tt1xiNvIQ9LD4bECzdgzIuBaU97GgYDusIUgIgTkc0wYZ3EUg0COHPly4cVsTj\n' +
    '1Cyy/+qufhBUJw5om7E=\n' +
    '-----END CERTIFICATE-----';

let ECC_256_PUB_INTER_CERT: string =
  '-----BEGIN CERTIFICATE-----\n' +
    'MIICTDCCAfGgAwIBAgIUc1x0keEiLIcS1oKtSpeEiPoaepkwCgYIKoZIzj0EAwIw\n' +
    'bjELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaWppbmcxEDAOBgNVBAcMB0JlaWpp\n' +
    'bmcxFjAUBgNVBAoMDUVDRFNBIFJvb3QgQ0ExCzAJBgNVBAsMAklUMRYwFAYDVQQD\n' +
    'DA1FQ0RTQSBSb290IENBMB4XDTI1MDkyODEwNTM0OVoXDTMwMDkyNzEwNTM0OVow\n' +
    'fjELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaWppbmcxEDAOBgNVBAcMB0JlaWpp\n' +
    'bmcxHjAcBgNVBAoMFUVDRFNBIEludGVybWVkaWF0ZSBDQTELMAkGA1UECwwCSVQx\n' +
    'HjAcBgNVBAMMFUVDRFNBIEludGVybWVkaWF0ZSBDQTBZMBMGByqGSM49AgEGCCqG\n' +
    'SM49AwEHA0IABGoCqpHBV/glJeezsp693/hhflYOKpHvaNszVBLkTurkqrbhbaMo\n' +
    'hw1oO2Zro54rhZ8tom2UAGn1rzNmRVBCxTajXTBbMAwGA1UdEwQFMAMBAf8wCwYD\n' +
    'VR0PBAQDAgEGMB0GA1UdDgQWBBRY4FRtA8JksMcyVhCzb8RrZt5sVDAfBgNVHSME\n' +
    'GDAWgBTmNm24RfPnLf1HMNCocS90CGalJjAKBggqhkjOPQQDAgNJADBGAiEAstMv\n' +
    'puHi/dgAlvycicL3VQ5iITvUSG2fo286LYc01CQCIQCyw4+94ovyRtaT/WWoZh3u\n' +
    'ia4tt478nYeQgMChg+xtSw==\n' +
    '-----END CERTIFICATE-----';

let ECC_256_PUB_ROOT_CERT: string =
  '-----BEGIN CERTIFICATE-----\n' +
    'MIICUzCCAfqgAwIBAgIUPma0DkC+ck+t/3eykmsKsy5D0egwCgYIKoZIzj0EAwIw\n' +
    'bjELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaWppbmcxEDAOBgNVBAcMB0JlaWpp\n' +
    'bmcxFjAUBgNVBAoMDUVDRFNBIFJvb3QgQ0ExCzAJBgNVBAsMAklUMRYwFAYDVQQD\n' +
    'DA1FQ0RTQSBSb290IENBMB4XDTI1MDkyODEwNTMyN1oXDTM1MDkyNjEwNTMyN1ow\n' +
    'bjELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaWppbmcxEDAOBgNVBAcMB0JlaWpp\n' +
    'bmcxFjAUBgNVBAoMDUVDRFNBIFJvb3QgQ0ExCzAJBgNVBAsMAklUMRYwFAYDVQQD\n' +
    'DA1FQ0RTQSBSb290IENBMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEA3KYWepl\n' +
    'wjHe/Htx2cAhrjaZpWPJOUyL6siUFRayVebaqOQejuUPypbj+u4ZHodsviUe12E1\n' +
    '50Q+R9Uayes+WKN2MHQwHQYDVR0OBBYEFOY2bbhF8+ct/Ucw0KhxL3QIZqUmMB8G\n' +
    'A1UdIwQYMBaAFOY2bbhF8+ct/Ucw0KhxL3QIZqUmMAsGA1UdDwQEAwIBBjAJBgNV\n' +
    'HREEAjAAMAkGA1UdEgQCMAAwDwYDVR0TAQH/BAUwAwEB/zAKBggqhkjOPQQDAgNH\n' +
    'ADBEAiAjo+sFDtGVhyc+NqdwxhepqSXOjRI5As6TSz3OYTvERwIgayLgfBn2uABH\n' +
    'wYQI60CEJkDF9Pn2fxsGuNEyyn0ks28=\n' +
    '-----END CERTIFICATE-----';
let ECC_256_PRI_ENTRY_KEY: string =
  '-----BEGIN EC PRIVATE KEY-----\n' +
    'MHcCAQEEII8+yfaMTjUyWtjIopGgNxHUMPKhAYTnIVYbiTOVB4x5oAoGCCqGSM49\n' +
    'AwEHoUQDQgAEDSjuWFwLJnZv0oRFOVckJUEnZ1e oTUCKHx4UPxsnitVu7dypzInu\n' +
    'HL/8JwOEJqK9ingQV1BVJ2Caqljh7IryLg==\n' +
    '-----END EC PRIVATE KEY-----';

// string转Uint8Array。
function stringToUint8Array(str: string): Uint8Array {
  let arr: number[] = [];
  for (let i = 0, j = str.length; i < j; i++) {
    arr.push(str.charCodeAt(i));
  };
  return new Uint8Array(arr);
}

async function createX509Cert(inStream: string): Promise<cert.X509Cert> {
  let encodingBlob: cert.EncodingBlob = {
    data: stringToUint8Array(inStream),
    encodingFormat: cert.EncodingFormat.FORMAT_PEM

  };
  let x509Cert: cert.X509Cert = {} as cert.X509Cert;
  try {
    x509Cert = await cert.createX509Cert(encodingBlob);
  } catch (error) {
    console.error(`createX509Cert failed: errCode: ${error.code}, message: ${error.message}`);
  }

  return x509Cert;
}

async function testCmsVerifyTest() {
  try {
    let plainText: Uint8Array = new Uint8Array([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07]);
    let x509CertEntry: cert.X509Cert = await createX509Cert(ECC_256_PUB_ENTRY_CERT);
    let x509CertInter: cert.X509Cert = await createX509Cert(ECC_256_PUB_INTER_CERT);
    let x509CertRoot: cert.X509Cert = await createX509Cert(ECC_256_PUB_ROOT_CERT);
    let cms: cert.CmsGenerator = cert.createCmsGenerator(cert.CmsContentType.SIGNED_DATA);
    let signerConfig: cert.CmsSignerConfig = {
      mdName: 'SHA256',
    };
    let keyInfo: cert.PrivateKeyInfo = {
      key: ECC_256_PRI_ENTRY_KEY
    };
    let option: cert.CmsGeneratorOptions = {
      outFormat: cert.CmsFormat.PEM
    };
    cms.addSigner(x509CertEntry, keyInfo, signerConfig);
    let signData = cms.doFinalSync(plainText, option);
    let config: cert.CmsVerificationConfig = {
      trustCerts: [x509CertRoot, x509CertInter],
    };
    let verify: cert.CmsParser = cert.createCmsParser();
    await verify.setRawData(signData, cert.CmsFormat.PEM);
    await verify.verifySignedData(config);
    console.info(`verifySignedData result: success.`);
  } catch (error) {
    console.error(`verifySignedData failed: errCode: ${error.code}, message: ${error.message}`);
  }
}
CreateCmsVerifyObject.ets

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