(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_aead_chacha20poly1305_ietf_keygen — Generate a random ChaCha20-Poly1305 (IETF) key.
sodium_crypto_aead_chacha20poly1305_ietf_keygen(): string
Generate a random key for use with sodium_crypto_aead_chacha20poly1305_ietf_encrypt() and sodium_crypto_aead_chacha20poly1305_ietf_decrypt().
This function has no parameters.
Returns a 256-bit random key.
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https://www.php.net/manual/en/function.sodium-crypto-aead-chacha20poly1305-ietf-keygen.php