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import * as asn1js from "asn1js";
import { BufferSourceConverter } from "pvtsutils";
import * as pvutils from "pvutils";
import { EMPTY_BUFFER, EMPTY_STRING } from "./constants";
import { ECNamedCurves } from "./ECNamedCurves";
import { ParameterError } from "./errors";
import { PkiObject, PkiObjectParameters } from "./PkiObject";
import * as Schema from "./Schema";
const X = "x";
const Y = "y";
const NAMED_CURVE = "namedCurve";
export interface IECPublicKey {
namedCurve: string;
x: ArrayBuffer;
y: ArrayBuffer;
}
export interface ECPublicKeyJson {
crv: string;
x: string;
y: string;
}
export type ECPublicKeyParameters = PkiObjectParameters & Partial<IECPublicKey> & { json?: ECPublicKeyJson; };
/**
* Represents the PrivateKeyInfo structure described in [RFC5480](https://datatracker.ietf.org/doc/html/rfc5480)
*/
export class ECPublicKey extends PkiObject implements IECPublicKey {
public static override CLASS_NAME = "ECPublicKey";
public namedCurve!: string;
public x!: ArrayBuffer;
public y!: ArrayBuffer;
/**
* Initializes a new instance of the {@link ECPublicKey} class
* @param parameters Initialization parameters
*/
constructor(parameters: ECPublicKeyParameters = {}) {
super();
this.x = pvutils.getParametersValue(parameters, X, ECPublicKey.defaultValues(X));
this.y = pvutils.getParametersValue(parameters, Y, ECPublicKey.defaultValues(Y));
this.namedCurve = pvutils.getParametersValue(parameters, NAMED_CURVE, ECPublicKey.defaultValues(NAMED_CURVE));
if (parameters.json) {
this.fromJSON(parameters.json);
}
if (parameters.schema) {
this.fromSchema(parameters.schema);
}
}
/**
* Returns default values for all class members
* @param memberName String name for a class member
* @returns Default value
*/
public static override defaultValues(memberName: typeof NAMED_CURVE): string;
public static override defaultValues(memberName: typeof X | typeof Y): ArrayBuffer;
public static override defaultValues(memberName: string): any {
switch (memberName) {
case X:
case Y:
return EMPTY_BUFFER;
case NAMED_CURVE:
return EMPTY_STRING;
default:
return super.defaultValues(memberName);
}
}
/**
* Compare values with default values for all class members
* @param memberName String name for a class member
* @param memberValue Value to compare with default value
*/
static compareWithDefault<T>(memberName: string, memberValue: T): memberValue is T {
switch (memberName) {
case X:
case Y:
return memberValue instanceof ArrayBuffer &&
(pvutils.isEqualBuffer(memberValue, ECPublicKey.defaultValues(memberName)));
case NAMED_CURVE:
return typeof memberValue === "string" &&
memberValue === ECPublicKey.defaultValues(memberName);
default:
return super.defaultValues(memberName);
}
}
/**
* Returns value of pre-defined ASN.1 schema for current class
* @param parameters Input parameters for the schema
* @returns ASN.1 schema object
*/
public static override schema(): Schema.SchemaType {
return new asn1js.RawData();
}
public fromSchema(schema1: BufferSource): any {
//#region Check the schema is valid
const view = BufferSourceConverter.toUint8Array(schema1);
if (view[0] !== 0x04) {
throw new Error("Object's schema was not verified against input data for ECPublicKey");
}
//#endregion
//#region Get internal properties from parsed schema
const namedCurve = ECNamedCurves.find(this.namedCurve);
if (!namedCurve) {
throw new Error(`Incorrect curve OID: ${this.namedCurve}`);
}
const coordinateLength = namedCurve.size;
if (view.byteLength !== (coordinateLength * 2 + 1)) {
throw new Error("Object's schema was not verified against input data for ECPublicKey");
}
this.namedCurve = namedCurve.name;
this.x = view.slice(1, coordinateLength + 1).buffer;
this.y = view.slice(1 + coordinateLength, coordinateLength * 2 + 1).buffer;
//#endregion
}
public toSchema(): asn1js.RawData {
return new asn1js.RawData({
data: pvutils.utilConcatBuf(
(new Uint8Array([0x04])).buffer,
this.x,
this.y
)
});
}
public toJSON(): ECPublicKeyJson {
const namedCurve = ECNamedCurves.find(this.namedCurve);
return {
crv: namedCurve ? namedCurve.name : this.namedCurve,
x: pvutils.toBase64(pvutils.arrayBufferToString(this.x), true, true, false),
y: pvutils.toBase64(pvutils.arrayBufferToString(this.y), true, true, false)
};
}
/**
* Converts JSON value into current object
* @param json JSON object
*/
public fromJSON(json: any): void {
ParameterError.assert("json", json, "crv", "x", "y");
let coordinateLength = 0;
const namedCurve = ECNamedCurves.find(json.crv);
if (namedCurve) {
this.namedCurve = namedCurve.id;
coordinateLength = namedCurve.size;
}
// TODO Simplify Base64url encoding
const xConvertBuffer = pvutils.stringToArrayBuffer(pvutils.fromBase64(json.x, true));
if (xConvertBuffer.byteLength < coordinateLength) {
this.x = new ArrayBuffer(coordinateLength);
const view = new Uint8Array(this.x);
const convertBufferView = new Uint8Array(xConvertBuffer);
view.set(convertBufferView, 1);
} else {
this.x = xConvertBuffer.slice(0, coordinateLength);
}
// TODO Simplify Base64url encoding
const yConvertBuffer = pvutils.stringToArrayBuffer(pvutils.fromBase64(json.y, true));
if (yConvertBuffer.byteLength < coordinateLength) {
this.y = new ArrayBuffer(coordinateLength);
const view = new Uint8Array(this.y);
const convertBufferView = new Uint8Array(yConvertBuffer);
view.set(convertBufferView, 1);
} else {
this.y = yConvertBuffer.slice(0, coordinateLength);
}
}
}
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