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• [FILE] index.ts
• [FILE] keypair.ts
• [FILE] publickey.ts

Просмотр файла: publickey.ts

// Copyright (c) Mysten Labs, Inc.
// Modifications Copyright (c) 2024 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

import { fromBase64 } from '@iota/bcs';
import { secp256k1 } from '@noble/curves/secp256k1';
import { sha256 } from '@noble/hashes/sha256';

import { bytesEqual, PublicKey } from '../../cryptography/publickey.js';
import type { PublicKeyInitData } from '../../cryptography/publickey.js';
import { SIGNATURE_SCHEME_TO_FLAG } from '../../cryptography/signature-scheme.js';
import { parseSerializedSignature } from '../../cryptography/signature.js';

const SECP256K1_PUBLIC_KEY_SIZE = 33;

/**
 * A Secp256k1 public key
 */
export class Secp256k1PublicKey extends PublicKey {
    static SIZE = SECP256K1_PUBLIC_KEY_SIZE;
    private data: Uint8Array;

    /**
     * Create a new Secp256k1PublicKey object
     * @param value secp256k1 public key as buffer or base-64 encoded string
     */
    constructor(value: PublicKeyInitData) {
        super();

        if (typeof value === 'string') {
            this.data = fromBase64(value);
        } else if (value instanceof Uint8Array) {
            this.data = value;
        } else {
            this.data = Uint8Array.from(value);
        }

        if (this.data.length !== SECP256K1_PUBLIC_KEY_SIZE) {
            throw new Error(
                `Invalid public key input. Expected ${SECP256K1_PUBLIC_KEY_SIZE} bytes, got ${this.data.length}`,
            );
        }
    }

    /**
     * Checks if two Secp256k1 public keys are equal
     */
    override equals(publicKey: Secp256k1PublicKey): boolean {
        return super.equals(publicKey);
    }

    /**
     * Return the byte array representation of the Secp256k1 public key
     */
    toRawBytes(): Uint8Array {
        return this.data;
    }

    /**
     * Return the IOTA address associated with this Secp256k1 public key
     */
    flag(): number {
        return SIGNATURE_SCHEME_TO_FLAG['Secp256k1'];
    }

    /**
     * Verifies that the signature is valid for the provided message
     */
    async verify(message: Uint8Array, signature: Uint8Array | string): Promise<boolean> {
        let bytes;
        if (typeof signature === 'string') {
            const parsed = parseSerializedSignature(signature);
            if (parsed.signatureScheme !== 'Secp256k1') {
                throw new Error('Invalid signature scheme');
            }

            if (!bytesEqual(this.toRawBytes(), parsed.publicKey)) {
                throw new Error('Signature does not match public key');
            }

            bytes = parsed.signature;
        } else {
            bytes = signature;
        }

        return secp256k1.verify(
            secp256k1.Signature.fromCompact(bytes),
            sha256(message),
            this.toRawBytes(),
        );
    }
}

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