71 lines
1.3 KiB
JavaScript
71 lines
1.3 KiB
JavaScript
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// @flow
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import BN from 'bn.js';
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import bs58 from 'bs58';
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/**
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* A public key
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*/
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export class PublicKey {
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_bn: BN;
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/**
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* Create a new PublicKey object
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*/
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constructor(number: string | Buffer | Array<number>) {
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let radix = 10;
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if (typeof number === 'string' && number.startsWith('0x')) {
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this._bn = new BN(number.substring(2), 16);
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} else {
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this._bn = new BN(number, radix);
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}
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if (this._bn.byteLength() > 32) {
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throw new Error(`Invalid public key input`);
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}
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}
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/**
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* Checks if the provided object is a PublicKey
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*/
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static isPublicKey(o: Object): boolean {
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return o instanceof PublicKey;
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}
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/**
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* Checks if two publicKeys are equal
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*/
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equals(publicKey: PublicKey): boolean {
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return this._bn.eq(publicKey._bn);
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}
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/**
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* Return the base-58 representation of the public key
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*/
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toBase58(): string {
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return bs58.encode(this.toBuffer());
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}
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/**
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* Return the base-58 representation of the public key
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*/
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toBuffer(): Buffer {
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const b = this._bn.toBuffer();
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if (b.length === 32) {
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return b;
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}
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const zeroPad = new Buffer(32);
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b.copy(zeroPad, 32 - b.length);
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return zeroPad;
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}
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/**
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* Returns a string representation of the public key
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*/
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toString(): string {
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return this.toBase58();
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}
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}
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