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import * as asn1js from "asn1js";
import * as pvtsutils from "pvtsutils";
import * as pvutils from "pvutils";
import { EMPTY_STRING } from "./constants";
import { AsnError, ParameterError } from "./errors";
import { PkiObject, PkiObjectParameters } from "./PkiObject";
import * as Schema from "./Schema";
export interface IRSAPublicKey {
/**
* Modulus part of RSA public key
*/
modulus: asn1js.Integer;
/**
* Public exponent of RSA public key
*/
publicExponent: asn1js.Integer;
}
export interface RSAPublicKeyJson {
n: string;
e: string;
}
export type RSAPublicKeyParameters = PkiObjectParameters & Partial<IRSAPublicKey> & { json?: RSAPublicKeyJson; };
const MODULUS = "modulus";
const PUBLIC_EXPONENT = "publicExponent";
const CLEAR_PROPS = [MODULUS, PUBLIC_EXPONENT];
/**
* Represents the RSAPublicKey structure described in [RFC3447](https://datatracker.ietf.org/doc/html/rfc3447)
*/
export class RSAPublicKey extends PkiObject implements IRSAPublicKey {
public static override CLASS_NAME = "RSAPublicKey";
public modulus!: asn1js.Integer;
public publicExponent!: asn1js.Integer;
/**
* Initializes a new instance of the {@link RSAPublicKey} class
* @param parameters Initialization parameters
*/
constructor(parameters: RSAPublicKeyParameters = {}) {
super();
this.modulus = pvutils.getParametersValue(parameters, MODULUS, RSAPublicKey.defaultValues(MODULUS));
this.publicExponent = pvutils.getParametersValue(parameters, PUBLIC_EXPONENT, RSAPublicKey.defaultValues(PUBLIC_EXPONENT));
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 MODULUS | typeof PUBLIC_EXPONENT): asn1js.Integer;
public static override defaultValues(memberName: string): any {
switch (memberName) {
case MODULUS:
return new asn1js.Integer();
case PUBLIC_EXPONENT:
return new asn1js.Integer();
default:
return super.defaultValues(memberName);
}
}
/**
* @inheritdoc
* @asn ASN.1 schema
* ```asn
* RSAPublicKey ::= Sequence {
* modulus Integer, -- n
* publicExponent Integer -- e
* }
*```
*/
public static override schema(parameters: Schema.SchemaParameters<{ modulus?: string; publicExponent?: string; }> = {}): Schema.SchemaType {
const names = pvutils.getParametersValue<NonNullable<typeof parameters.names>>(parameters, "names", {});
return (new asn1js.Sequence({
name: (names.blockName || EMPTY_STRING),
value: [
new asn1js.Integer({ name: (names.modulus || EMPTY_STRING) }),
new asn1js.Integer({ name: (names.publicExponent || EMPTY_STRING) })
]
}));
}
public fromSchema(schema: asn1js.AsnType): void {
// Clear input data first
pvutils.clearProps(schema, CLEAR_PROPS);
// Check the schema is valid
const asn1 = asn1js.compareSchema(schema,
schema,
RSAPublicKey.schema({
names: {
modulus: MODULUS,
publicExponent: PUBLIC_EXPONENT
}
})
);
AsnError.assertSchema(asn1, this.className);
// Get internal properties from parsed schema
this.modulus = asn1.result.modulus.convertFromDER(256);
this.publicExponent = asn1.result.publicExponent;
}
public toSchema(): asn1js.Sequence {
return (new asn1js.Sequence({
value: [
this.modulus.convertToDER(),
this.publicExponent
]
}));
}
public toJSON(): RSAPublicKeyJson {
return {
n: pvtsutils.Convert.ToBase64Url(this.modulus.valueBlock.valueHexView),
e: pvtsutils.Convert.ToBase64Url(this.publicExponent.valueBlock.valueHexView),
};
}
/**
* Converts JSON value into current object
* @param json JSON object
*/
fromJSON(json: RSAPublicKeyJson): void {
ParameterError.assert("json", json, "n", "e");
const array = pvutils.stringToArrayBuffer(pvutils.fromBase64(json.n, true));
this.modulus = new asn1js.Integer({ valueHex: array.slice(0, Math.pow(2, pvutils.nearestPowerOf2(array.byteLength))) });
this.publicExponent = new asn1js.Integer({ valueHex: pvutils.stringToArrayBuffer(pvutils.fromBase64(json.e, true)).slice(0, 3) });
}
}
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