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import invalidKeyInput from './invalid_key_input.js';
import { encodeBase64, decodeBase64 } from '../lib/base64.js';
import { JOSENotSupported } from '../util/errors.js';
import { isCryptoKey, isKeyObject } from './is_key_like.js';
const formatPEM = (b64, descriptor) => {
const newlined = (b64.match(/.{1,64}/g) || []).join('\n');
return `-----BEGIN ${descriptor}-----\n${newlined}\n-----END ${descriptor}-----`;
};
const genericExport = async (keyType, keyFormat, key) => {
if (isKeyObject(key)) {
if (key.type !== keyType) {
throw new TypeError(`key is not a ${keyType} key`);
}
return key.export({ format: 'pem', type: keyFormat });
}
if (!isCryptoKey(key)) {
throw new TypeError(invalidKeyInput(key, 'CryptoKey', 'KeyObject'));
}
if (!key.extractable) {
throw new TypeError('CryptoKey is not extractable');
}
if (key.type !== keyType) {
throw new TypeError(`key is not a ${keyType} key`);
}
return formatPEM(encodeBase64(new Uint8Array(await crypto.subtle.exportKey(keyFormat, key))), `${keyType.toUpperCase()} KEY`);
};
export const toSPKI = (key) => {
return genericExport('public', 'spki', key);
};
export const toPKCS8 = (key) => {
return genericExport('private', 'pkcs8', key);
};
const findOid = (keyData, oid, from = 0) => {
if (from === 0) {
oid.unshift(oid.length);
oid.unshift(0x06);
}
const i = keyData.indexOf(oid[0], from);
if (i === -1)
return false;
const sub = keyData.subarray(i, i + oid.length);
if (sub.length !== oid.length)
return false;
return sub.every((value, index) => value === oid[index]) || findOid(keyData, oid, i + 1);
};
const getNamedCurve = (keyData) => {
switch (true) {
case findOid(keyData, [0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07]):
return 'P-256';
case findOid(keyData, [0x2b, 0x81, 0x04, 0x00, 0x22]):
return 'P-384';
case findOid(keyData, [0x2b, 0x81, 0x04, 0x00, 0x23]):
return 'P-521';
default:
return undefined;
}
};
const genericImport = async (replace, keyFormat, pem, alg, options) => {
let algorithm;
let keyUsages;
const keyData = new Uint8Array(atob(pem.replace(replace, ''))
.split('')
.map((c) => c.charCodeAt(0)));
const isPublic = keyFormat === 'spki';
switch (alg) {
case 'PS256':
case 'PS384':
case 'PS512':
algorithm = { name: 'RSA-PSS', hash: `SHA-${alg.slice(-3)}` };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
case 'RS256':
case 'RS384':
case 'RS512':
algorithm = { name: 'RSASSA-PKCS1-v1_5', hash: `SHA-${alg.slice(-3)}` };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
case 'RSA-OAEP':
case 'RSA-OAEP-256':
case 'RSA-OAEP-384':
case 'RSA-OAEP-512':
algorithm = {
name: 'RSA-OAEP',
hash: `SHA-${parseInt(alg.slice(-3), 10) || 1}`,
};
keyUsages = isPublic ? ['encrypt', 'wrapKey'] : ['decrypt', 'unwrapKey'];
break;
case 'ES256':
algorithm = { name: 'ECDSA', namedCurve: 'P-256' };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
case 'ES384':
algorithm = { name: 'ECDSA', namedCurve: 'P-384' };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
case 'ES512':
algorithm = { name: 'ECDSA', namedCurve: 'P-521' };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
case 'ECDH-ES':
case 'ECDH-ES+A128KW':
case 'ECDH-ES+A192KW':
case 'ECDH-ES+A256KW': {
const namedCurve = getNamedCurve(keyData);
algorithm = namedCurve?.startsWith('P-') ? { name: 'ECDH', namedCurve } : { name: 'X25519' };
keyUsages = isPublic ? [] : ['deriveBits'];
break;
}
case 'Ed25519':
case 'EdDSA':
algorithm = { name: 'Ed25519' };
keyUsages = isPublic ? ['verify'] : ['sign'];
break;
default:
throw new JOSENotSupported('Invalid or unsupported "alg" (Algorithm) value');
}
return crypto.subtle.importKey(keyFormat, keyData, algorithm, options?.extractable ?? (isPublic ? true : false), keyUsages);
};
export const fromPKCS8 = (pem, alg, options) => {
return genericImport(/(?:-----(?:BEGIN|END) PRIVATE KEY-----|\s)/g, 'pkcs8', pem, alg, options);
};
export const fromSPKI = (pem, alg, options) => {
return genericImport(/(?:-----(?:BEGIN|END) PUBLIC KEY-----|\s)/g, 'spki', pem, alg, options);
};
function getElement(seq) {
const result = [];
let next = 0;
while (next < seq.length) {
const nextPart = parseElement(seq.subarray(next));
result.push(nextPart);
next += nextPart.byteLength;
}
return result;
}
function parseElement(bytes) {
let position = 0;
let tag = bytes[0] & 0x1f;
position++;
if (tag === 0x1f) {
tag = 0;
while (bytes[position] >= 0x80) {
tag = tag * 128 + bytes[position] - 0x80;
position++;
}
tag = tag * 128 + bytes[position] - 0x80;
position++;
}
let length = 0;
if (bytes[position] < 0x80) {
length = bytes[position];
position++;
}
else if (length === 0x80) {
length = 0;
while (bytes[position + length] !== 0 || bytes[position + length + 1] !== 0) {
if (length > bytes.byteLength) {
throw new TypeError('invalid indefinite form length');
}
length++;
}
const byteLength = position + length + 2;
return {
byteLength,
contents: bytes.subarray(position, position + length),
raw: bytes.subarray(0, byteLength),
};
}
else {
const numberOfDigits = bytes[position] & 0x7f;
position++;
length = 0;
for (let i = 0; i < numberOfDigits; i++) {
length = length * 256 + bytes[position];
position++;
}
}
const byteLength = position + length;
return {
byteLength,
contents: bytes.subarray(position, byteLength),
raw: bytes.subarray(0, byteLength),
};
}
function spkiFromX509(buf) {
const tbsCertificate = getElement(getElement(parseElement(buf).contents)[0].contents);
return encodeBase64(tbsCertificate[tbsCertificate[0].raw[0] === 0xa0 ? 6 : 5].raw);
}
let createPublicKey;
function getSPKI(x509) {
try {
createPublicKey ??= globalThis.process?.getBuiltinModule?.('node:crypto')?.createPublicKey;
}
catch {
createPublicKey = 0;
}
if (createPublicKey) {
try {
return new createPublicKey(x509).export({ format: 'pem', type: 'spki' });
}
catch { }
}
const pem = x509.replace(/(?:-----(?:BEGIN|END) CERTIFICATE-----|\s)/g, '');
const raw = decodeBase64(pem);
return formatPEM(spkiFromX509(raw), 'PUBLIC KEY');
}
export const fromX509 = (pem, alg, options) => {
let spki;
try {
spki = getSPKI(pem);
}
catch (cause) {
throw new TypeError('Failed to parse the X.509 certificate', { cause });
}
return fromSPKI(spki, alg, options);
};
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