[範例] 使用 node-forge 解析憑證 | 自然人憑證開發筆記

自然人憑證的公鑰可以解析出使用者的公鑰、姓名、身分證末四碼等資訊。

Demo#

程式碼#

Javascript 用來讀取憑證

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<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/forge.min.js"></script>
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<h1>自然人憑證 解析憑證</h1>
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<button onclick="openPopupForm(0)">讀取根憑證</button>
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<button onclick="openPopupForm(1)">讀取中繼憑證</button>
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<button onclick="openPopupForm(2)">讀取簽章憑證</button>
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<button onclick="openPopupForm(3)">讀取加密憑證</button>
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<br /><br />
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憑證<br />
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<textarea id="certb64" rows="8" cols="65"></textarea><br>
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<button onclick="submit()">解析</button>
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<hr />
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<pre id="result"></pre>

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let popupForm;
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let timeout;
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let num;
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function openPopupForm(certnum) {
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  num = certnum;
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  popupForm = window.open(
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    "http://localhost:61161/popupForm",
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    "popupForm",
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    "height=200, width=200, left=100, top=20"
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  );
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  timeout = setTimeout(() => {
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    popupForm.close();
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    alert("尚未安裝元件");
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  }, 5000);
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}
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function receiveMessage(event) {
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  if (event.origin !== "http://localhost:61161") return;
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  let ret = JSON.parse(event.data);
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  if (ret.func === "getTbs") {
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    clearTimeout(timeout);
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    const tbsData = { func: "GetUserCert" };
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    popupForm.postMessage(JSON.stringify(tbsData), "*");
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  } else {
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    const data = JSON.parse(event.data);
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    const certs = data.slots[0].token.certs;
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    document.getElementsByName("certb64")[0].value = certs[num].certb64;
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  }
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}
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window.addEventListener("message", receiveMessage, false);
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function submit() {
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  const begin = "-----BEGIN CERTIFICATE-----";
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  const end = "-----END CERTIFICATE-----";
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  // 載入憑證
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  const certb64 = begin + document.getElementById("certb64").value + end;
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  const cert = forge.pki.certificateFromPem(certb64);
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  // 建置回傳的JSON，toUtf8用於解決中文亂碼問題
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  const result = {};
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  result["subject"] = toUtf8(cert.subject);
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  result["issuer"] = toUtf8(cert.issuer);
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  result["validity"] = cert.validity;
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  result["extensions"] = cert.extensions;
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  result["serialNumber"] = cert.serialNumber;
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  result["publicKey"] = cert.publicKey;
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  const publicKeyPem = forge.pki.publicKeyToPem(cert.publicKey);
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  const publicKeyB64 = publicKeyPem
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    .replace("-----BEGIN PUBLIC KEY-----", "")
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    .replace("-----END PUBLIC KEY-----", "")
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    .replaceAll("\r\n", "");
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  result["publicKeyB64"] = publicKeyB64;
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  document.getElementById("result").innerHTML = JSON.stringify(result, null, 2);
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}
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// 將object中所有value轉為utf8
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function toUtf8(obj) {
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  if (typeof obj === "object" && obj !== null) {
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    for (const key in obj) {
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      if (Object.prototype.hasOwnProperty.call(obj, key)) {
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        obj[key] = toUtf8(obj[key]);
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      }
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    }
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    return obj;
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  } else if (typeof obj === "string") {
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    const textDecoder = new TextDecoder("utf-8");
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    const byteArray = new Uint8Array([...obj].map((c) => c.charCodeAt(0)));
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    return textDecoder.decode(byteArray);
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  } else {
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    return obj;
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  }
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}

Response 範例#

以簽章憑證為例，說明如下：

subject：本憑證資訊，個人憑證含姓名
issuer：上級憑證資訊
validity：有效期限
extensions：擴充欄位
- subjectDirectoryAttributes：字串末四碼為身分證末四碼
publicKey：公鑰的物件
publicKeyB64：公鑰的 Base64，與 /pkcs11info?withcert=true 中的公鑰Base64 相同

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{
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  "subject": {
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    "attributes": [
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      {
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        "type": "2.5.4.6",
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        "value": "TW",
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        "valueTagClass": 19,
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        "name": "countryName",
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        "shortName": "C"
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      },
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      {
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        "type": "2.5.4.3",
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        "value": "周詳",
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        "valueTagClass": 12,
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        "name": "commonName",
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        "shortName": "CN"
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      },
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      {
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        "type": "2.5.4.5",
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        "value": "00000001....",
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        "valueTagClass": 19,
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        "name": "serialNumber"
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      }
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    ],
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    "hash": "d64b521011538e55864524a...."
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  },
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  "issuer": {
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    "attributes": [
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      {
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        "type": "2.5.4.6",
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        "value": "TW",
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        "valueTagClass": 19,
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        "name": "countryName",
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        "shortName": "C"
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      },
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      {
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        "type": "2.5.4.10",
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        "value": "行政院",
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        "valueTagClass": 12,
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        "name": "organizationName",
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        "shortName": "O"
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      },
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      {
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        "type": "2.5.4.11",
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        "value": "內政部憑證管理中心",
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        "valueTagClass": 12,
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        "name": "organizationalUnitName",
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        "shortName": "OU"
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      }
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    ],
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    "hash": "25ab5e84667697ec05...."
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  },
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  "validity": {
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    "notBefore": "2020-11-12T01:17:56.000Z",
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    "notAfter": "2025-11-12T15:59:59.000Z"
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  },
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  "extensions": [
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    {
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      "id": "2.5.29.35",
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      "critical": false,
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      "value": "0\u0016\u0014ú4g\t\n\"÷bH&¦EÅÃ\"¤",
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      "name": "authorityKeyIdentifier"
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    },
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    {
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      "id": "2.5.29.14",
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      "critical": false,
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      "value": "\u0004\u0014sqdñ)?U\u001eo\u0000é\u0019w(¼n",
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      "name": "subjectKeyIdentifier",
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      "subjectKeyIdentifier": "7371649af1293f551e6f00e999197728bc87826e"
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    },
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    {
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      "id": "1.3.6.1.5.5.7.1.1",
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      "critical": false,
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      "value": "00G\u0006\b+\u0006\u0001\u0005\u0005\u00070\u0002;http://moica.nat.gov.tw/repository/Certs/IssuedToThisCA.p7b0A\u0006\b+\u0006\u0001\u0005\u0005\u00070\u00015http://moica.nat.gov.tw/cgi-bin/OCSP2/ocsp_server.exe",
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      "name": "authorityInfoAccess"
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    },
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    {
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      "id": "2.5.29.15",
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      "critical": true,
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      "value": "\u0003\u0002\u0007",
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      "name": "keyUsage",
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      "digitalSignature": true,
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      "nonRepudiation": false,
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      "keyEncipherment": false,
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      "dataEncipherment": false,
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      "keyAgreement": false,
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      "keyCertSign": false,
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      "cRLSign": false,
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      "encipherOnly": false,
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      "decipherOnly": false
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    },
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    {
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      "id": "2.5.29.32",
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      "critical": false,
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      "value": "0\u000b0\t\u0006\u0007`ve\u0000\u0003\u0003",
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      "name": "certificatePolicies"
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    },
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    {
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      "id": "2.5.29.9",
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      "critical": false,
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      "value": "0*0\u0015\u0006\u0007`v\u0001d\u0002\u00011\n\u0006\b`v\u0001d\u0003\u0001\u00010\u0011\u0006\u0007`v\u0001d\u000231\u0006\f\u00041234",
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      "name": "subjectDirectoryAttributes"
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    },
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    {
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      "id": "2.5.29.31",
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      "critical": false,
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      "value": "00@ > <:http://moica.nat.gov.tw/repository/MOICA/CRL2/CRL_0028.crl0@ > <:http://moica.nat.gov.tw/repository/MOICA/CRL2/complete.crl",
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      "name": "cRLDistributionPoints"
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    }
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  ],
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  "serialNumber": "00d43a822d041...",
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  "publicKey": {
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    "n": {
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      "data": [
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        13863697,
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        47207358,
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        ...
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      ],
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      "t": 79,
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      "s": 0
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    },
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    "e": {
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      "data": [
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        65537
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      ],
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      "t": 1,
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      "s": 0
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    }
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  },
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  "publicKeyB64": "MIIBIjANBgkqhkiG9w0BA...."
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}