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fix(amazon-cognito-identity-js): avoid unnecessary crypto polyfills in webpack builds #7521

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merged 2 commits into from
Jan 11, 2021
Merged

fix(amazon-cognito-identity-js): avoid unnecessary crypto polyfills in webpack builds #7521

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f552620
fix(amazon-cognito-identity-js): add .web.js version for cryptoSecure…
nnyath Jan 8, 2021
83af45c
Merge branch 'main' into auth/fix-avoid-webpack-crypto-polyfill
amhinson Jan 8, 2021
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37 changes: 37 additions & 0 deletions packages/amazon-cognito-identity-js/src/utils/cryptoSecureRandomInt.web.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
var crypto;

// Native crypto from window (Browser)
if (typeof window !== 'undefined' && window.crypto) {
crypto = window.crypto;
}

// Native (experimental IE 11) crypto from window (Browser)
if (!crypto && typeof window !== 'undefined' && window.msCrypto) {
crypto = window.msCrypto;
}

/*
* Cryptographically secure pseudorandom number generator
* As Math.random() is cryptographically not safe to use
*/
export default function cryptoSecureRandomInt() {
if (crypto) {
// Use getRandomValues method (Browser)
if (typeof crypto.getRandomValues === 'function') {
try {
return crypto.getRandomValues(new Uint32Array(1))[0];
} catch (err) {}
}

// Use randomBytes method (NodeJS)
if (typeof crypto.randomBytes === 'function') {
try {
return crypto.randomBytes(4).readInt32LE();
} catch (err) {}
}
}

throw new Error(
'Native crypto module could not be used to get secure random number.'
);
}