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const { X509CertificateGenerator, X509Certificate, cryptoProvider, X509ChainBuilder, BasicConstraintsExtension, KeyUsagesExtension, KeyUsageFlags, ExtendedKeyUsageExtension, ExtendedKeyUsage, SubjectAlternativeNameExtension, GeneralName } = require("@peculiar/x509");
const nodeCrypto = require("crypto");
// Use Node.js native webcrypto
const crypto = nodeCrypto.webcrypto;
// Patch global CryptoProvider to use Node.js crypto
cryptoProvider.set(crypto);
// a hexString is considered negative if it's most significant bit is 1
// because serial numbers use ones' complement notation
// this RFC in section 4.1.2.2 requires serial numbers to be positive
// http://www.ietf.org/rfc/rfc5280.txt
function toPositiveHex(hexString) {
var mostSiginficativeHexAsInt = parseInt(hexString[0], 16);
if (mostSiginficativeHexAsInt < 8) {
return hexString;
}
mostSiginficativeHexAsInt -= 8;
return mostSiginficativeHexAsInt.toString() + hexString.substring(1);
}
function getAlgorithmName(key) {
switch (key) {
case "sha256":
return "SHA-256";
case 'sha384':
return "SHA-384";
case 'sha512':
return "SHA-512";
default:
return "SHA-1";
}
}
function getSigningAlgorithm(hashKey, keyType) {
const hashAlg = getAlgorithmName(hashKey);
if (keyType === 'ec') {
return {
name: "ECDSA",
hash: hashAlg
};
}
return {
name: "RSASSA-PKCS1-v1_5",
hash: hashAlg
};
}
function getKeyAlgorithm(options) {
const keyType = options.keyType || 'rsa';
const hashAlg = getAlgorithmName(options.algorithm || 'sha1');
if (keyType === 'ec') {
const curve = options.curve || 'P-256';
return {
name: "ECDSA",
namedCurve: curve
};
}
return {
name: "RSASSA-PKCS1-v1_5",
modulusLength: options.keySize || 2048,
publicExponent: new Uint8Array([1, 0, 1]),
hash: hashAlg
};
}
// Build extensions array from options or use defaults
// Supports the old node-forge extension format for backwards compatibility
function buildExtensions(userExtensions, commonName) {
if (!userExtensions || userExtensions.length === 0) {
// Default extensions
return [
new BasicConstraintsExtension(false, undefined, true),
new KeyUsagesExtension(KeyUsageFlags.digitalSignature | KeyUsageFlags.keyEncipherment, true),
new ExtendedKeyUsageExtension([ExtendedKeyUsage.serverAuth, ExtendedKeyUsage.clientAuth], false),
new SubjectAlternativeNameExtension([
{ type: 'dns', value: commonName },
...(commonName === 'localhost' ? [{ type: 'ip', value: '127.0.0.1' }] : [])
], false)
];
}
// Convert user extensions from node-forge format to @peculiar/x509 format
const extensions = [];
for (const ext of userExtensions) {
const critical = ext.critical || false;
switch (ext.name) {
case 'basicConstraints':
extensions.push(new BasicConstraintsExtension(
ext.cA || false,
ext.pathLenConstraint,
critical
));
break;
case 'keyUsage':
let flags = 0;
if (ext.digitalSignature) flags |= KeyUsageFlags.digitalSignature;
if (ext.nonRepudiation || ext.contentCommitment) flags |= KeyUsageFlags.nonRepudiation;
if (ext.keyEncipherment) flags |= KeyUsageFlags.keyEncipherment;
if (ext.dataEncipherment) flags |= KeyUsageFlags.dataEncipherment;
if (ext.keyAgreement) flags |= KeyUsageFlags.keyAgreement;
if (ext.keyCertSign) flags |= KeyUsageFlags.keyCertSign;
if (ext.cRLSign) flags |= KeyUsageFlags.cRLSign;
if (ext.encipherOnly) flags |= KeyUsageFlags.encipherOnly;
if (ext.decipherOnly) flags |= KeyUsageFlags.decipherOnly;
extensions.push(new KeyUsagesExtension(flags, critical));
break;
case 'extKeyUsage':
const usages = [];
if (ext.serverAuth) usages.push(ExtendedKeyUsage.serverAuth);
if (ext.clientAuth) usages.push(ExtendedKeyUsage.clientAuth);
if (ext.codeSigning) usages.push(ExtendedKeyUsage.codeSigning);
if (ext.emailProtection) usages.push(ExtendedKeyUsage.emailProtection);
if (ext.timeStamping) usages.push(ExtendedKeyUsage.timeStamping);
extensions.push(new ExtendedKeyUsageExtension(usages, critical));
break;
case 'subjectAltName':
const altNames = (ext.altNames || []).map(alt => {
// node-forge type values:
// 1 = email (rfc822Name)
// 2 = DNS
// 6 = URI
// 7 = IP
switch (alt.type) {
case 1: // email
return { type: 'email', value: alt.value };
case 2: // DNS
return { type: 'dns', value: alt.value };
case 6: // URI
return { type: 'url', value: alt.value };
case 7: // IP
return { type: 'ip', value: alt.ip || alt.value };
default:
// Try to infer type from properties
if (alt.ip) return { type: 'ip', value: alt.ip };
if (alt.dns) return { type: 'dns', value: alt.dns };
if (alt.email) return { type: 'email', value: alt.email };
if (alt.uri || alt.url) return { type: 'url', value: alt.uri || alt.url };
return { type: 'dns', value: alt.value };
}
});
extensions.push(new SubjectAlternativeNameExtension(altNames, critical));
break;
default:
// Skip unknown extensions with a warning
console.warn(`Unknown extension "${ext.name}" ignored`);
}
}
return extensions;
}
// Convert attributes from node-forge format to X509 name format
function convertAttributes(attrs) {
const nameMap = {
'commonName': 'CN',
'countryName': 'C',
'ST': 'ST',
'localityName': 'L',
'organizationName': 'O',
'OU': 'OU'
};
return attrs.map(attr => {
const key = attr.name || attr.shortName;
const oid = nameMap[key] || key;
return `${oid}=${attr.value}`;
}).join(', ');
}
// Detect key type from PEM key using Node.js crypto
function detectKeyType(pemKey) {
const keyObject = nodeCrypto.createPrivateKey(pemKey);
return keyObject.asymmetricKeyType; // 'rsa' or 'ec'
}
// Map Node.js curve names to Web Crypto curve names
function normalizeECCurve(curveName) {
const curveMap = {
'prime256v1': 'P-256',
'secp384r1': 'P-384',
'secp521r1': 'P-521',
'P-256': 'P-256',
'P-384': 'P-384',
'P-521': 'P-521'
};
return curveMap[curveName] || curveName;
}
// Get EC curve from key object
function getECCurve(keyObject) {
const details = keyObject.asymmetricKeyDetails;
if (details && details.namedCurve) {
return normalizeECCurve(details.namedCurve);
}
return 'P-256'; // default
}
// Convert PEM key to CryptoKey
async function importPrivateKey(pemKey, algorithm, keyType) {
// Auto-detect key type if not provided
const keyObject = nodeCrypto.createPrivateKey(pemKey);
const detectedKeyType = keyObject.asymmetricKeyType;
const actualKeyType = keyType || detectedKeyType;
// Convert to PKCS#8 format
const pkcs8Pem = keyObject.export({ type: 'pkcs8', format: 'pem' });
const pemContents = pkcs8Pem
.replace(/-----BEGIN PRIVATE KEY-----/, '')
.replace(/-----END PRIVATE KEY-----/, '')
.replace(/\s/g, '');
const binaryDer = Buffer.from(pemContents, 'base64');
let importAlgorithm;
if (actualKeyType === 'ec') {
const curve = getECCurve(keyObject);
importAlgorithm = {
name: 'ECDSA',
namedCurve: curve
};
} else {
importAlgorithm = {
name: 'RSASSA-PKCS1-v1_5',
hash: getAlgorithmName(algorithm)
};
}
return await crypto.subtle.importKey(
'pkcs8',
binaryDer,
importAlgorithm,
true,
['sign']
);
}
async function importPublicKey(pemKey, algorithm, keyType, curve) {
const pemContents = pemKey
.replace(/-----BEGIN PUBLIC KEY-----/, '')
.replace(/-----END PUBLIC KEY-----/, '')
.replace(/\s/g, '');
const binaryDer = Buffer.from(pemContents, 'base64');
let importAlgorithm;
if (keyType === 'ec') {
importAlgorithm = {
name: 'ECDSA',
namedCurve: curve || 'P-256'
};
} else {
importAlgorithm = {
name: 'RSASSA-PKCS1-v1_5',
hash: getAlgorithmName(algorithm)
};
}
return await crypto.subtle.importKey(
'spki',
binaryDer,
importAlgorithm,
true,
['verify']
);
}
async function generatePemAsync(keyPair, attrs, options, ca) {
const { privateKey, publicKey } = keyPair;
// Generate serial number
const serialBytes = crypto.getRandomValues(new Uint8Array(9));
const serialHex = toPositiveHex(Buffer.from(serialBytes).toString('hex'));
// Set up dates
const notBefore = options.notBeforeDate || new Date();
let notAfter;
if (options.notAfterDate) {
notAfter = options.notAfterDate;
} else {
notAfter = new Date(notBefore);
notAfter.setDate(notAfter.getDate() + 365);
}
// Default attributes
attrs = attrs || [
{
name: "commonName",
value: "example.org",
},
{
name: "countryName",
value: "US",
},
{
shortName: "ST",
value: "Virginia",
},
{
name: "localityName",
value: "Blacksburg",
},
{
name: "organizationName",
value: "Test",
},
{
shortName: "OU",
value: "Test",
},
];
const subjectName = convertAttributes(attrs);
const keyType = options.keyType || 'rsa';
const signingAlg = getSigningAlgorithm(options.algorithm, keyType);
// Extract common name for SAN extension
const commonNameAttr = attrs.find(attr => attr.name === 'commonName' || attr.shortName === 'CN');
const commonName = commonNameAttr ? commonNameAttr.value : 'localhost';
// Build extensions array
const extensions = buildExtensions(options.extensions, commonName);
let cert;
if (ca) {
// Generate certificate signed by CA
const caCert = new X509Certificate(ca.cert);
const caPrivateKey = await importPrivateKey(ca.key, options.algorithm || "sha256", keyType);
cert = await X509CertificateGenerator.create({
serialNumber: serialHex,
subject: subjectName,
issuer: caCert.subject,
notBefore: notBefore,
notAfter: notAfter,
signingAlgorithm: signingAlg,
publicKey: publicKey,
signingKey: caPrivateKey,
extensions: extensions
});
} else {
// Generate self-signed certificate
cert = await X509CertificateGenerator.createSelfSigned({
serialNumber: serialHex,
name: subjectName,
notBefore: notBefore,
notAfter: notAfter,
signingAlgorithm: signingAlg,
keys: {
privateKey: privateKey,
publicKey: publicKey
},
extensions: extensions
});
}
// Calculate fingerprint (SHA-1 hash of the certificate)
const certRaw = cert.rawData;
const fingerprintBuffer = await crypto.subtle.digest('SHA-1', certRaw);
const fingerprint = Buffer.from(fingerprintBuffer)
.toString('hex')
.match(/.{2}/g)
.join(':');
// Export keys to PEM
const privateKeyDer = await crypto.subtle.exportKey('pkcs8', privateKey);
const publicKeyDer = await crypto.subtle.exportKey('spki', publicKey);
let privatePem;
if (options.passphrase) {
// Encrypt the private key with the passphrase using Node.js crypto
const keyObject = nodeCrypto.createPrivateKey({
key: Buffer.from(privateKeyDer),
format: 'der',
type: 'pkcs8'
});
privatePem = keyObject.export({
type: 'pkcs8',
format: 'pem',
cipher: 'aes-256-cbc',
passphrase: options.passphrase
});
} else {
privatePem =
'-----BEGIN PRIVATE KEY-----\n' +
Buffer.from(privateKeyDer).toString('base64').match(/.{1,64}/g).join('\n') +
'\n-----END PRIVATE KEY-----\n';
}
const publicPem =
'-----BEGIN PUBLIC KEY-----\n' +
Buffer.from(publicKeyDer).toString('base64').match(/.{1,64}/g).join('\n') +
'\n-----END PUBLIC KEY-----\n';
const certPem = cert.toString('pem');
const pem = {
private: privatePem,
public: publicPem,
cert: certPem,
fingerprint: fingerprint,
};
// Client certificate support
if (options && options.clientCertificate) {
// Parse clientCertificate options - can be boolean or object
const clientOpts = typeof options.clientCertificate === 'object' ? options.clientCertificate : {};
// Resolve client certificate options with fallbacks to deprecated options
const clientKeySize = clientOpts.keySize || options.clientCertificateKeySize || 2048;
const clientAlgorithm = clientOpts.algorithm || options.algorithm || "sha1";
const clientCN = clientOpts.cn || options.clientCertificateCN || "John Doe jdoe123";
// Client cert uses same key type and curve as main cert by default
const clientKeyType = clientOpts.keyType || keyType;
const clientCurve = clientOpts.curve || options.curve || 'P-256';
const clientKeyAlg = getKeyAlgorithm({
keyType: clientKeyType,
keySize: clientKeySize,
algorithm: clientAlgorithm,
curve: clientCurve
});
const clientKeyPair = await crypto.subtle.generateKey(
clientKeyAlg,
true,
["sign", "verify"]
);
const clientSerialBytes = crypto.getRandomValues(new Uint8Array(9));
const clientSerialHex = toPositiveHex(Buffer.from(clientSerialBytes).toString('hex'));
// Resolve client certificate validity dates
const clientNotBefore = clientOpts.notBeforeDate || new Date();
let clientNotAfter;
if (clientOpts.notAfterDate) {
clientNotAfter = clientOpts.notAfterDate;
} else {
clientNotAfter = new Date(clientNotBefore);
clientNotAfter.setFullYear(clientNotBefore.getFullYear() + 1);
}
const clientAttrs = JSON.parse(JSON.stringify(attrs));
for (let i = 0; i < clientAttrs.length; i++) {
if (clientAttrs[i].name === "commonName") {
clientAttrs[i] = {
name: "commonName",
value: clientCN
};
}
}
const clientSubjectName = convertAttributes(clientAttrs);
const issuerName = convertAttributes(attrs);
// Signing algorithm for client cert - uses main key type since signed by root
const clientSigningAlg = getSigningAlgorithm(clientAlgorithm, keyType);
// Create client cert signed by root key
const clientCertRaw = await X509CertificateGenerator.create({
serialNumber: clientSerialHex,
subject: clientSubjectName,
issuer: issuerName,
notBefore: clientNotBefore,
notAfter: clientNotAfter,
signingAlgorithm: clientSigningAlg,
publicKey: clientKeyPair.publicKey,
signingKey: privateKey // Sign with root private key
});
// Export client keys
const clientPrivateKeyDer = await crypto.subtle.exportKey('pkcs8', clientKeyPair.privateKey);
const clientPublicKeyDer = await crypto.subtle.exportKey('spki', clientKeyPair.publicKey);
pem.clientprivate =
'-----BEGIN PRIVATE KEY-----\n' +
Buffer.from(clientPrivateKeyDer).toString('base64').match(/.{1,64}/g).join('\n') +
'\n-----END PRIVATE KEY-----\n';
pem.clientpublic =
'-----BEGIN PUBLIC KEY-----\n' +
Buffer.from(clientPublicKeyDer).toString('base64').match(/.{1,64}/g).join('\n') +
'\n-----END PUBLIC KEY-----\n';
pem.clientcert = clientCertRaw.toString('pem');
}
// Verify certificate chain
const x509Cert = new X509Certificate(cert.rawData);
const certificates = [x509Cert];
// If CA-signed, include CA cert in the chain for verification
if (ca) {
const caCert = new X509Certificate(ca.cert);
certificates.push(caCert);
}
const chainBuilder = new X509ChainBuilder({
certificates: certificates
});
const chain = await chainBuilder.build(x509Cert);
if (chain.length === 0) {
throw new Error("Certificate could not be verified.");
}
return pem;
}
/**
* Generate a certificate (async)
*
* @param {CertificateField[]} attrs Attributes used for subject.
* @param {object} options
* @param {string} [options.keyType="rsa"] Key type: "rsa" or "ec" (elliptic curve)
* @param {number} [options.keySize=2048] the size for the private key in bits (RSA only)
* @param {string} [options.curve="P-256"] The elliptic curve to use: "P-256", "P-384", or "P-521" (EC only)
* @param {object} [options.extensions] additional extensions for the certificate
* @param {string} [options.algorithm="sha1"] The signature algorithm sha256, sha384, sha512 or sha1
* @param {Date} [options.notBeforeDate=new Date()] The date before which the certificate should not be valid
* @param {Date} [options.notAfterDate] The date after which the certificate should not be valid (default: notBeforeDate + 365 days)
* @param {boolean|object} [options.clientCertificate=false] Generate client cert signed by the original key. Can be `true` for defaults or an options object.
* @param {number} [options.clientCertificate.keySize=2048] Key size for the client certificate in bits (RSA only)
* @param {string} [options.clientCertificate.keyType] Key type for client cert (defaults to main keyType)
* @param {string} [options.clientCertificate.curve] Elliptic curve for client cert (EC only)
* @param {string} [options.clientCertificate.algorithm] Signature algorithm for client cert (defaults to options.algorithm or "sha1")
* @param {string} [options.clientCertificate.cn="John Doe jdoe123"] Client certificate's common name
* @param {Date} [options.clientCertificate.notBeforeDate=new Date()] The date before which the client certificate should not be valid
* @param {Date} [options.clientCertificate.notAfterDate] The date after which the client certificate should not be valid (default: notBeforeDate + 1 year)
* @param {string} [options.clientCertificateCN="John Doe jdoe123"] @deprecated Use options.clientCertificate.cn instead
* @param {number} [options.clientCertificateKeySize] @deprecated Use options.clientCertificate.keySize instead
* @param {object} [options.ca] CA certificate and key for signing (if not provided, generates self-signed)
* @param {string} [options.ca.key] CA private key in PEM format
* @param {string} [options.ca.cert] CA certificate in PEM format
* @param {string} [options.passphrase] Passphrase to encrypt the private key (uses AES-256-CBC)
* @returns {Promise<object>} Promise that resolves with certificate data
*/
exports.generate = async function generate(attrs, options) {
attrs = attrs || undefined;
options = options || {};
const keyType = options.keyType || 'rsa';
const curve = options.curve || 'P-256';
let keyPair;
if (options.keyPair) {
// Import existing key pair
keyPair = {
privateKey: await importPrivateKey(options.keyPair.privateKey, options.algorithm || "sha1", keyType),
publicKey: await importPublicKey(options.keyPair.publicKey, options.algorithm || "sha1", keyType, curve)
};
} else {
// Generate new key pair using appropriate algorithm
const keyAlg = getKeyAlgorithm(options);
keyPair = await crypto.subtle.generateKey(
keyAlg,
true,
["sign", "verify"]
);
}
return await generatePemAsync(keyPair, attrs, options, options.ca);
};