sodium_crypto_aead_xchacha20poly1305_ietf_decrypt
PHP 7 >= 7.2.0, PHP 8
sodium_crypto_aead_xchacha20poly1305_ietf_decrypt - (Preferred) Verify then decrypt with XChaCha20-Poly1305
Manual
sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
string$ciphertext,
string$additional_data,
string$nonce,
string$key
): string|false
string$ciphertext,
string$additional_data,
string$nonce,
string$key
): string|false
Verify then decrypt with ChaCha20-Poly1305 (eXtended-nonce variant).
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.