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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
var DotNetEntropyLib = {
$DOTNETENTROPY: {
// batchedQuotaMax is the max number of bytes as specified by the api spec.
// If the byteLength of array is greater than 65536, throw a QuotaExceededError and terminate the algorithm.
// https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
batchedQuotaMax: 65536,
getBatchedRandomValues: function (buffer, bufferLength) {
// for modern web browsers
// map the work array to the memory buffer passed with the length
for (var i = 0; i < bufferLength; i += this.batchedQuotaMax) {
var view = new Uint8Array(Module.HEAPU8.buffer, buffer + i, Math.min(bufferLength - i, this.batchedQuotaMax));
crypto.getRandomValues(view)
}
}
},
dotnet_browser_entropy : function (buffer, bufferLength) {
// check that we have crypto available
if (typeof crypto === 'object' && typeof crypto['getRandomValues'] === 'function') {
DOTNETENTROPY.getBatchedRandomValues(buffer, bufferLength)
return 0;
} else {
// we couldn't find a proper implementation, as Math.random() is not suitable
// instead of aborting here we will return and let managed code handle the message
return -1;
}
},
};
autoAddDeps(DotNetEntropyLib, '$DOTNETENTROPY')
mergeInto(LibraryManager.library, DotNetEntropyLib)
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