101 lines
3.3 KiB
TypeScript
101 lines
3.3 KiB
TypeScript
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interface Header {
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name: string;
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offset: number;
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length: number;
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derived?: boolean
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}
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export const Constants = {
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crypto:
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{
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RAW_KEY_LENGTH: 32,
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SIGN_PRIVATE_KEY_HEADER: Buffer.from("302e020100300506032b657004220420", "hex"),
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ENCRYPT_PRIVATE_KEY_HEADER: Buffer.from("302e020100300506032b656e04220420", "hex"),
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PRIVATE_KEY_LENGTH: 48,
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SIGN_PUBLIC_KEY_HEADER: Buffer.from("302a300506032b6570032100", "hex"),
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ENCRYPT_PUBLIC_KEY_HEADER: Buffer.from("302a300506032b656e032100", "hex"),
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PUBLIC_KEY_LENGTH: 44,
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SIGNATURE_LENGTH: 64
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},
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fields: {
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PAYLOAD_LENGTH_OFFSET: -1, // filled in below
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TOTAL_HEADERS_LENGTH: -1,
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PAYLOAD_MAX_LENGTH: -1, // 64KB - headers
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headers: [
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{
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name: "MAGIC",
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offset: 0,
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length: 2
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},
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{
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name: "PROTOCOL_VERSION",
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offset: 2,
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length: 1
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},
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{
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name: "SIGNATURE_VERSION",
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offset: 3,
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length: 1
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},
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{
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name: "TIMESTAMP",
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offset: 4,
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length: 4,
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"derived": true
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},
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{
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name: "MESSAGE_ID",
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offset: 8,
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length: 4
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},
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{
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name: "PAYLOAD_TYPE",
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offset: 12,
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length: 1
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},
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{
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name: "RESERVED",
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offset: 13,
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length: 1
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},
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{
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name: "PAYLOAD_SIZE",
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offset: 14,
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length: 2,
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"derived": true
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}
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],
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PAYLOAD_OFFSET: 16
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}
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};
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Constants.fields.PAYLOAD_LENGTH_OFFSET = <number>Constants.fields.headers.find(header => header.name === "PAYLOAD_SIZE")?.offset;
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Constants.fields.TOTAL_HEADERS_LENGTH = Constants.fields.headers.reduce((prev: number, curr: Header) => prev + curr.length, 0);
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Constants.fields.PAYLOAD_MAX_LENGTH = (1024 * 64) - Constants.fields.TOTAL_HEADERS_LENGTH;
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/**
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* Convert DER key Buffer to PEM string. FIXME: break out the validity checks.
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* @param DERKey key in DER-form
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* @returns key in PEM form
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*/
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export const DERToPEM = (DERKey: Buffer) => {
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const wrap = (buf: Buffer, type: "PUBLIC" | "PRIVATE") => Buffer.from(`-----BEGIN ${type} KEY-----
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${buf.toString("base64")}
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-----END ${type} KEY-----
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`);
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if (DERKey.byteLength == Constants.crypto.PRIVATE_KEY_LENGTH) {
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const header = DERKey.subarray(0, Constants.crypto.PRIVATE_KEY_LENGTH - Constants.crypto.RAW_KEY_LENGTH);
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if (header.equals(Constants.crypto.ENCRYPT_PRIVATE_KEY_HEADER) || header.equals(Constants.crypto.SIGN_PRIVATE_KEY_HEADER)) {
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return wrap(DERKey, "PRIVATE");
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}
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}
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else if (DERKey.byteLength == Constants.crypto.PUBLIC_KEY_LENGTH) {
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const header = DERKey.subarray(0, Constants.crypto.PUBLIC_KEY_LENGTH - Constants.crypto.RAW_KEY_LENGTH);
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if (header.equals(Constants.crypto.ENCRYPT_PUBLIC_KEY_HEADER) || header.equals(Constants.crypto.SIGN_PUBLIC_KEY_HEADER)) {
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return wrap(DERKey, "PUBLIC");
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}
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}
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throw new Error("Unrecognized key type");
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};
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