@aws-amplify/auth/dist/esm/providers/cognito/utils/srp/getBytesFromHex.mjs

Auth category of aws-amplify

import { HEX_TO_SHORT } from './constants.mjs';

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
/**
 * Converts a hexadecimal encoded string to a Uint8Array of bytes.
 *
 * @param encoded The hexadecimal encoded string
 */
const getBytesFromHex = (encoded) => {
    if (encoded.length % 2 !== 0) {
        throw new Error('Hex encoded strings must have an even number length');
    }
    const out = new Uint8Array(encoded.length / 2);
    for (let i = 0; i < encoded.length; i += 2) {
        const encodedByte = encoded.slice(i, i + 2).toLowerCase();
        if (encodedByte in HEX_TO_SHORT) {
            out[i / 2] = HEX_TO_SHORT[encodedByte];
        }
        else {
            throw new Error(`Cannot decode unrecognized sequence ${encodedByte} as hexadecimal`);
        }
    }
    return out;
};

export { getBytesFromHex };
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