sodium_crypto_aead_chacha20poly1305_ietf_decrypt
(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_aead_chacha20poly1305_ietf_decrypt — Verify that the ciphertext includes a valid tag
Description
string
$ciphertext,string
$additional_data,string
$nonce,string
$key): string|false
Verify then decrypt with ChaCha20-Poly1305 (IETF variant).
The IETF variant uses 96-bit nonces and 32-bit internal counters, instead of 64-bit for both.
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. 12 bytes long.
-
key -
Encryption key (256-bit).
Return Values
Returns the plaintext on success, or false on failure.
