Baseline Widely available
Note: This feature is available in Web Workers.
The Crypto.getRandomValues() method lets you get cryptographically strong random values. The array given as the parameter is filled with random numbers (random in its cryptographic meaning).
To guarantee enough performance, implementations are not using a truly random number generator, but they are using a pseudo-random number generator seeded with a value with enough entropy. The pseudo-random number generator algorithm (PRNG) may vary across user agents, but is suitable for cryptographic purposes.
getRandomValues() is the only member of the Crypto interface which can be used from an insecure context.
getRandomValues(typedArray)
typedArray
An integer-based TypedArray, that is one of: Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, BigUint64Array (but not Float16Array, Float32Array nor Float64Array). All elements in the array will be overwritten with random numbers.
The same array passed as typedArray but with its contents replaced with the newly generated random numbers. Note that typedArray is modified in-place, and no copy is made.
QuotaExceededError DOMException
Thrown if the byteLength of typedArray exceeds 65,536.
Prefer the generateKey() method for key generation, which is guaranteed to be running in a secure context.
There is no minimum degree of entropy mandated by the Web Cryptography specification. User agents are instead urged to provide the best entropy they can when generating random numbers, using a well-defined, efficient pseudorandom number generator built into the user agent itself, but seeded with values taken from an external source of pseudorandom numbers, such as a platform-specific random number function, the Unix /dev/urandom device, or other source of random or pseudorandom data.
const array = new Uint32Array(10);
self.crypto.getRandomValues(array);
console.log("Your lucky numbers:");
for (const num of array) {
console.log(num);
}
Math.random, a non-cryptographic source of random numbers.RetroSearch is an open source project built by @garambo | Open a GitHub Issue
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