sodium_crypto_aead_xchacha20poly1305_ietf_encrypt

sodium_crypto_aead_xchacha20poly1305_ietf_encrypt

(Preferred) Encrypt then authenticate with XChaCha20-Poly1305

string **sodium_crypto_aead_xchacha20poly1305_ietf_encrypt** string $message string $additional_data string $nonce string $key

Encrypt then authenticate with XChaCha20-Poly1305 (eXtended-nonce variant).

Generally, XChaCha20-Poly1305 is the best of the provided AEAD modes to use.

messageThe plaintext message to encrypt.

additional_dataAdditional, 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

keyEncryption key (256-bit).

Returns the ciphertext and tag on success, return.falseforfailure.