/*! @azure/msal-browser v5.5.0 2026-03-13 */
'use strict';
import { createBrowserAuthError } from '../error/BrowserAuthError.mjs';
import { KEY_FORMAT_JWK } from '../utils/BrowserConstants.mjs';
import { urlEncodeArr, base64Encode } from '../encode/Base64Encode.mjs';
import { base64DecToArr, base64Decode } from '../encode/Base64Decode.mjs';
import { nonBrowserEnvironment, cryptoNonExistent, failedToDecryptEarResponse } from '../error/BrowserAuthErrorCodes.mjs';

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
/**
 * This file defines functions used by the browser library to perform cryptography operations such as
 * hashing and encoding. It also has helper functions to validate the availability of specific APIs.
 */
/**
 * See here for more info on RsaHashedKeyGenParams: https://developer.mozilla.org/en-US/docs/Web/API/RsaHashedKeyGenParams
 */
// Algorithms
const PKCS1_V15_KEYGEN_ALG = "RSASSA-PKCS1-v1_5";
const AES_GCM = "AES-GCM";
const HKDF = "HKDF";
// SHA-256 hashing algorithm
const S256_HASH_ALG = "SHA-256";
// MOD length for PoP tokens
const MODULUS_LENGTH = 2048;
// Public Exponent
const PUBLIC_EXPONENT = new Uint8Array([0x01, 0x00, 0x01]);
// UUID hex digits
const UUID_CHARS = "0123456789abcdef";
// Array to store UINT32 random value
const UINT32_ARR = new Uint32Array(1);
// Key Format
const RAW = "raw";
// Key Usages
const ENCRYPT = "encrypt";
const DECRYPT = "decrypt";
const DERIVE_KEY = "deriveKey";
// Suberror
const SUBTLE_SUBERROR = "crypto_subtle_undefined";
const keygenAlgorithmOptions = {
    name: PKCS1_V15_KEYGEN_ALG,
    hash: S256_HASH_ALG,
    modulusLength: MODULUS_LENGTH,
    publicExponent: PUBLIC_EXPONENT,
};
/**
 * Check whether browser crypto is available.
 */
function validateCryptoAvailable(skipValidateSubtleCrypto) {
    if (!window) {
        throw createBrowserAuthError(nonBrowserEnvironment);
    }
    if (!window.crypto) {
        throw createBrowserAuthError(cryptoNonExistent);
    }
    if (!skipValidateSubtleCrypto && !window.crypto.subtle) {
        throw createBrowserAuthError(cryptoNonExistent, SUBTLE_SUBERROR);
    }
}
/**
 * Returns a sha-256 hash of the given dataString as an ArrayBuffer.
 * @param dataString {string} data string
 * @param performanceClient {?IPerformanceClient}
 * @param correlationId {?string} correlation id
 */
async function sha256Digest(dataString) {
    const encoder = new TextEncoder();
    const data = encoder.encode(dataString);
    return window.crypto.subtle.digest(S256_HASH_ALG, data);
}
/**
 * Populates buffer with cryptographically random values.
 * @param dataBuffer
 */
function getRandomValues(dataBuffer) {
    return window.crypto.getRandomValues(dataBuffer);
}
/**
 * Returns random Uint32 value.
 * @returns {number}
 */
function getRandomUint32() {
    window.crypto.getRandomValues(UINT32_ARR);
    return UINT32_ARR[0];
}
/**
 * Creates a UUID v7 from the current timestamp.
 * Implementation relies on the system clock to guarantee increasing order of generated identifiers.
 * @returns {number}
 */
function createNewGuid() {
    const currentTimestamp = Date.now();
    const baseRand = getRandomUint32() * 0x400 + (getRandomUint32() & 0x3ff);
    // Result byte array
    const bytes = new Uint8Array(16);
    // A 12-bit `rand_a` field value
    const randA = Math.trunc(baseRand / 2 ** 30);
    // The higher 30 bits of 62-bit `rand_b` field value
    const randBHi = baseRand & (2 ** 30 - 1);
    // The lower 32 bits of 62-bit `rand_b` field value
    const randBLo = getRandomUint32();
    bytes[0] = currentTimestamp / 2 ** 40;
    bytes[1] = currentTimestamp / 2 ** 32;
    bytes[2] = currentTimestamp / 2 ** 24;
    bytes[3] = currentTimestamp / 2 ** 16;
    bytes[4] = currentTimestamp / 2 ** 8;
    bytes[5] = currentTimestamp;
    bytes[6] = 0x70 | (randA >>> 8);
    bytes[7] = randA;
    bytes[8] = 0x80 | (randBHi >>> 24);
    bytes[9] = randBHi >>> 16;
    bytes[10] = randBHi >>> 8;
    bytes[11] = randBHi;
    bytes[12] = randBLo >>> 24;
    bytes[13] = randBLo >>> 16;
    bytes[14] = randBLo >>> 8;
    bytes[15] = randBLo;
    let text = "";
    for (let i = 0; i < bytes.length; i++) {
        text += UUID_CHARS.charAt(bytes[i] >>> 4);
        text += UUID_CHARS.charAt(bytes[i] & 0xf);
        if (i === 3 || i === 5 || i === 7 || i === 9) {
            text += "-";
        }
    }
    return text;
}
/**
 * Generates a keypair based on current keygen algorithm config.
 * @param extractable
 * @param usages
 */
async function generateKeyPair(extractable, usages) {
    return window.crypto.subtle.generateKey(keygenAlgorithmOptions, extractable, usages);
}
/**
 * Export key as Json Web Key (JWK)
 * @param key
 */
async function exportJwk(key) {
    return window.crypto.subtle.exportKey(KEY_FORMAT_JWK, key);
}
/**
 * Imports key as Json Web Key (JWK), can set extractable and usages.
 * @param key
 * @param extractable
 * @param usages
 */
async function importJwk(key, extractable, usages) {
    return window.crypto.subtle.importKey(KEY_FORMAT_JWK, key, keygenAlgorithmOptions, extractable, usages);
}
/**
 * Signs given data with given key
 * @param key
 * @param data
 */
async function sign(key, data) {
    return window.crypto.subtle.sign(keygenAlgorithmOptions, key, data);
}
/**
 * Generates Base64 encoded jwk used in the Encrypted Authorize Response (EAR) flow
 */
async function generateEarKey() {
    const key = await generateBaseKey();
    const keyStr = urlEncodeArr(new Uint8Array(key));
    const jwk = {
        alg: "dir",
        kty: "oct",
        k: keyStr,
    };
    return base64Encode(JSON.stringify(jwk));
}
/**
 * Parses earJwk for encryption key and returns CryptoKey object
 * @param earJwk
 * @returns
 */
async function importEarKey(earJwk) {
    const b64DecodedJwk = base64Decode(earJwk);
    const jwkJson = JSON.parse(b64DecodedJwk);
    const rawKey = jwkJson.k;
    const keyBuffer = base64DecToArr(rawKey);
    return window.crypto.subtle.importKey(RAW, keyBuffer, AES_GCM, false, [
        DECRYPT,
    ]);
}
/**
 * Decrypt ear_jwe response returned in the Encrypted Authorize Response (EAR) flow
 * @param earJwk
 * @param earJwe
 * @returns
 */
async function decryptEarResponse(earJwk, earJwe) {
    const earJweParts = earJwe.split(".");
    if (earJweParts.length !== 5) {
        throw createBrowserAuthError(failedToDecryptEarResponse, "jwe_length");
    }
    const key = await importEarKey(earJwk).catch(() => {
        throw createBrowserAuthError(failedToDecryptEarResponse, "import_key");
    });
    try {
        const header = new TextEncoder().encode(earJweParts[0]);
        const iv = base64DecToArr(earJweParts[2]);
        const ciphertext = base64DecToArr(earJweParts[3]);
        const tag = base64DecToArr(earJweParts[4]);
        const tagLengthBits = tag.byteLength * 8;
        // Concat ciphertext and tag
        const encryptedData = new Uint8Array(ciphertext.length + tag.length);
        encryptedData.set(ciphertext);
        encryptedData.set(tag, ciphertext.length);
        const decryptedData = await window.crypto.subtle.decrypt({
            name: AES_GCM,
            iv: iv,
            tagLength: tagLengthBits,
            additionalData: header,
        }, key, encryptedData);
        return new TextDecoder().decode(decryptedData);
    }
    catch (e) {
        throw createBrowserAuthError(failedToDecryptEarResponse, "decrypt");
    }
}
/**
 * Generates symmetric base encryption key. This may be stored as all encryption/decryption keys will be derived from this one.
 */
async function generateBaseKey() {
    const key = await window.crypto.subtle.generateKey({
        name: AES_GCM,
        length: 256,
    }, true, [ENCRYPT, DECRYPT]);
    return window.crypto.subtle.exportKey(RAW, key);
}
/**
 * Returns the raw key to be passed into the key derivation function
 * @param baseKey
 * @returns
 */
async function generateHKDF(baseKey) {
    return window.crypto.subtle.importKey(RAW, baseKey, HKDF, false, [
        DERIVE_KEY,
    ]);
}
/**
 * Given a base key and a nonce generates a derived key to be used in encryption and decryption.
 * Note: every time we encrypt a new key is derived
 * @param baseKey
 * @param nonce
 * @returns
 */
async function deriveKey(baseKey, nonce, context) {
    return window.crypto.subtle.deriveKey({
        name: HKDF,
        salt: nonce,
        hash: S256_HASH_ALG,
        info: new TextEncoder().encode(context),
    }, baseKey, { name: AES_GCM, length: 256 }, false, [ENCRYPT, DECRYPT]);
}
/**
 * Encrypt the given data given a base key. Returns encrypted data and a nonce that must be provided during decryption
 * @param key
 * @param rawData
 */
async function encrypt(baseKey, rawData, context) {
    const encodedData = new TextEncoder().encode(rawData);
    // The nonce must never be reused with a given key.
    const nonce = window.crypto.getRandomValues(new Uint8Array(16));
    const derivedKey = await deriveKey(baseKey, nonce, context);
    const encryptedData = await window.crypto.subtle.encrypt({
        name: AES_GCM,
        iv: new Uint8Array(12), // New key is derived for every encrypt so we don't need a new nonce
    }, derivedKey, encodedData);
    return {
        data: urlEncodeArr(new Uint8Array(encryptedData)),
        nonce: urlEncodeArr(nonce),
    };
}
/**
 * Decrypt data with the given key and nonce
 * @param key
 * @param nonce
 * @param encryptedData
 * @returns
 */
async function decrypt(baseKey, nonce, context, encryptedData) {
    const encodedData = base64DecToArr(encryptedData);
    const derivedKey = await deriveKey(baseKey, base64DecToArr(nonce), context);
    const decryptedData = await window.crypto.subtle.decrypt({
        name: AES_GCM,
        iv: new Uint8Array(12), // New key is derived for every encrypt so we don't need a new nonce
    }, derivedKey, encodedData);
    return new TextDecoder().decode(decryptedData);
}
/**
 * Returns the SHA-256 hash of an input string
 * @param plainText
 */
async function hashString(plainText) {
    const hashBuffer = await sha256Digest(plainText);
    const hashBytes = new Uint8Array(hashBuffer);
    return urlEncodeArr(hashBytes);
}

export { createNewGuid, decrypt, decryptEarResponse, encrypt, exportJwk, generateBaseKey, generateEarKey, generateHKDF, generateKeyPair, getRandomValues, hashString, importEarKey, importJwk, sha256Digest, sign, validateCryptoAvailable };
//# sourceMappingURL=BrowserCrypto.mjs.map
