sodium_crypto_aead_chacha20poly1305_ietf_decrypt
Verify that the ciphertext includes a valid tag
Description
stringfalse sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
string $ciphertext,
string $additional_data,
string $nonce,
#[\SensitiveParameter]string $key
)
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.