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sodium_crypto_stream_xchacha20

(PHP 8 >= 8.1.0)

sodium_crypto_stream_xchacha20 — Expands the key and nonce into a keystream of pseudorandom bytes

sodium_crypto_stream_xchacha20(int $length, string $nonce, #[\SensitiveParameter] string $key): string

Expands the key and nonce into a keystream of pseudorandom bytes.

length: Number of bytes desired.
nonce: 24-byte nonce.
key: Key, possibly generated from sodium_crypto_stream_xchacha20_keygen().

Returns a pseudorandom stream that can be used with sodium_crypto_stream_xchacha20_xor().

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https://www.php.net/manual/en/function.sodium-crypto-stream-xchacha20.php