sodium_crypto_aead_xchacha20poly1305_ietf_decrypt

(Preferred) Verify then decrypt with XChaCha20-Poly1305

&reftitle.description; ``string``false```sodium_crypto_aead_xchacha20poly1305_ietf_decrypt` `string` `ciphertext` `string` `additional_data` `string` `nonce` `string` `key`

Verify then decrypt with ChaCha20-Poly1305 (eXtended-nonce variant).

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

&reftitle.parameters;

`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).

&reftitle.returnvalues;

Returns the plaintext on success, &return.falseforfailure;.