// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

'use strict';

// tslint:disable: no-any

import { createHash } from 'crypto';

import { injectable } from 'inversify';

import { traceError } from './logger';

import { ICryptoUtils, IHashFormat } from './types';

/**

* Implements tools related to cryptography

*/

@injectable()

export class CryptoUtils implements ICryptoUtils {

public createHash<E extends keyof IHashFormat>(

data: string,

hashFormat: E,

algorithm: 'SHA512' | 'SHA256' | 'FNV' = 'FNV'

): IHashFormat[E] {

let hash: string;

if (algorithm === 'FNV') {

// tslint:disable-next-line:no-require-imports

const fnv = require('@enonic/fnv-plus');

hash = fnv.fast1a32hex(data) as string;

} else if (algorithm === 'SHA256') {

hash = createHash('sha256')

.update(data)

.digest('hex');

} else {

hash = createHash('sha512')

.update(data)

.digest('hex');

}

if (hashFormat === 'number') {

const result = parseInt(hash, 16);

if (isNaN(result)) {

traceError(`Number hash for data '${data}' is NaN`);

}

return result as any;

}

return hash as any;

}

}