(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_aead_xchacha20poly1305_ietf_decrypt — (Preferred) Verify then decrypt with XChaCha20-Poly1305
$ciphertext
,$additional_data
,$nonce
,$key
Verify then decrypt with ChaCha20-Poly1305 (eXtended-nonce variant).
Generally, XChaCha20-Poly1305 is the best of the provided AEAD modes to use.
ciphertext
Must be in the format provided by sodium_crypto_aead_chacha20poly1305_ietf_encrypt() (ciphertext and tag, concatenated).
additional_data
Additional, authenticated data. This is used in the verification of the authentication tag appended to the ciphertext, but it is not encrypted or stored in the ciphertext.
nonce
A number that must be only used once, per message. 24 bytes long. This is a large enough bound to generate randomly (i.e. random_bytes()).
key
Encryption key (256-bit).
Returns the plaintext on success, o false
in caso di fallimento.