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<script src="https://cdn.jsdelivr.net/npm/node-forge@1.3.1/dist/forge.min.js"></script>
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<h1>自然人憑證 node-forge 解析 PKCS7</h1>
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PKCS7<br>
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<textarea id="pkcs7" rows="8" cols="65"></textarea><br>
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<button onclick="submit()">解析</button>
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</form>
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<hr />
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<pre id="result"></pre>

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function submit() {
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  let result = "";
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  // 從 certb64 提取公鑰
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  const begin = "-----BEGIN PKCS7-----";
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  const end = "-----END PKCS7-----";
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  const certPem = begin + document.getElementById("pkcs7").value + end;
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  const pkcs7 = forge.pkcs7.messageFromPem(certPem);
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  const data = toUtf8(pkcs7);
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  result += "簽章資訊\n===\n";
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  result += `tbs: ${data.rawCapture.content.value[0].value}\n`;
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  result += `hashAlgorithm: ${data.rawCapture.digestAlgorithm}\n`;
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  const attrs = data.rawCapture.authenticatedAttributes;
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  const nonce = data.rawCapture.authenticatedAttributes.find(
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    (i) => i.value[0].value == "1.2.840.113549.1.9.25.3"
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  );
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  result += `nonce: ${nonce ? nonce.value[1].value[0].value : "null"}\n`;
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  const cardNumber = data.rawCapture.authenticatedAttributes.find(
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    (i) => i.value[0].value == "2.16.886.1.100.2.204"
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  );
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  result += `cardNumber: ${
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    cardNumber ? cardNumber.value[1].value[0].value : "null"
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  }\n`;
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  const signingTime = data.rawCapture.authenticatedAttributes.find(
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    (i) => i.value[0].value == "1.2.840.113549.1.9.5"
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  );
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  result += `signingTime: ${
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    signingTime ? signingTime.value[1].value[0].value : "null"
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  }\n`;
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  result += "\n\n憑證資訊\n===\n";
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  const issuer = data.certificates[0].issuer.attributes;
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  result += `issuerDN: C=${issuer[0].value}, O=${issuer[1].value}, OU=${issuer[2].value}\n`;
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  const subject = data.certificates[0].subject.attributes;
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  result += `subjectDN: C=${subject[0].value}, O=${subject[1].value}, serialNumber=${subject[2].value}\n`;
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  result += `serialNumber: ${data.certificates[0].serialNumber}\n`;
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  result += `notAfter: ${data.certificates[0].validity.notAfter}\n`;
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  result += `notBefore: ${data.certificates[0].validity.notBefore}\n`;
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  result += JSON.stringify(data, null, 2);
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  document.getElementById("result").innerHTML = result;
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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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    if (/[\u0000-\u001F]/.test(obj)) {
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      // 解決OID亂碼問題
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      return toOid(obj);
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    } else {
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      // 解決中文亂碼問題
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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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    }
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  } else {
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    return obj;
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  }
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}
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// 將HEX轉為OID
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function toOid(str) {
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  const bytes = Array.from(str, c => c.charCodeAt(0));
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  const oid = [Math.floor(bytes[0] / 40), bytes[0] % 40];
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  let t = 0;
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  for (let i = 1; i < bytes.length; i++) {
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    if (bytes[i] >= 128) {
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      t = (t << 7) + (bytes[i] - 128);
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    } else {
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      oid.push((t << 7) + bytes[i]);
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      t = 0;
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    }
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  }
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  return oid.join(".");
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}