sodium_crypto_aead_xchacha20poly1305_ietf_decrypt
(Preferred) Verify then decrypt with XChaCha20-Poly1305
Description
stringfalse sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
string $ciphertext,
string $additional_data,
string $nonce,
#[\SensitiveParameter]string $key
)
Generally, XChaCha20-Poly1305 is the best of the provided AEAD modes to use.
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).
Return Values
Returns the plaintext on success, or false on failure.