sodium_crypto_stream_xchacha20

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

sodium_crypto_stream_xchacha20 Function synopsis

sodium_crypto_stream_xchacha20(
    int $length,
    string $nonce,
    string $key
  ): string

Parameters

$length

Typeint

Number of bytes desired.

$nonce

Typestring

24-byte nonce.

$key

Typestring

Key, possibly generated from sodium_crypto_stream_xchacha20_keygen.

Return value

Typestring

Returns a pseudorandom stream that can be used with sodium_crypto_stream_xchacha20_xor.