"use strict";
// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
Object.defineProperty(exports, "__esModule", { value: true });
exports.NodeCrypto = void 0;
const crypto = require("crypto");
class NodeCrypto {
    async sha256DigestBase64(str) {
        return crypto.createHash('sha256').update(str).digest('base64');
    }
    randomBytesBase64(count) {
        return crypto.randomBytes(count).toString('base64');
    }
    async verify(pubkey, data, signature) {
        const verifier = crypto.createVerify('sha256');
        verifier.update(data);
        verifier.end();
        return verifier.verify(pubkey, signature, 'base64');
    }
    async sign(privateKey, data) {
        const signer = crypto.createSign('RSA-SHA256');
        signer.update(data);
        signer.end();
        return signer.sign(privateKey, 'base64');
    }
    decodeBase64StringUtf8(base64) {
        return Buffer.from(base64, 'base64').toString('utf-8');
    }
    encodeBase64StringUtf8(text) {
        return Buffer.from(text, 'utf-8').toString('base64');
    }
    /**
     * Computes the SHA-256 hash of the provided string.
     * @param str The plain text string to hash.
     * @return A promise that resolves with the SHA-256 hash of the provided
     *   string in hexadecimal encoding.
     */
    async sha256DigestHex(str) {
        return crypto.createHash('sha256').update(str).digest('hex');
    }
    /**
     * Computes the HMAC hash of a message using the provided crypto key and the
     * SHA-256 algorithm.
     * @param key The secret crypto key in utf-8 or ArrayBuffer format.
     * @param msg The plain text message.
     * @return A promise that resolves with the HMAC-SHA256 hash in ArrayBuffer
     *   format.
     */
    async signWithHmacSha256(key, msg) {
        const cryptoKey = typeof key === 'string' ? key : toBuffer(key);
        return toArrayBuffer(crypto.createHmac('sha256', cryptoKey).update(msg).digest());
    }
}
exports.NodeCrypto = NodeCrypto;
/**
 * Converts a Node.js Buffer to an ArrayBuffer.
 * https://stackoverflow.com/questions/8609289/convert-a-binary-nodejs-buffer-to-javascript-arraybuffer
 * @param buffer The Buffer input to covert.
 * @return The ArrayBuffer representation of the input.
 */
function toArrayBuffer(buffer) {
    return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
}
/**
 * Converts an ArrayBuffer to a Node.js Buffer.
 * @param arrayBuffer The ArrayBuffer input to covert.
 * @return The Buffer representation of the input.
 */
function toBuffer(arrayBuffer) {
    return Buffer.from(arrayBuffer);
}
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