sodium_crypto_aead_aes256gcm_decrypt

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_aead_aes256gcm_decrypt — Verify then decrypt a message with AES-256-GCM

sodium_crypto_aead_aes256gcm_decrypt(
    string $ciphertext,
    string $additional_data,
    string $nonce,
    #[\SensitiveParameter] string $key
): string|false

Verify then decrypt with AES-256-GCM. Only available if sodium_crypto_aead_aes256gcm_is_available() returns true.

ciphertext: Must be in the format provided by sodium_crypto_aead_aes256gcm_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).

Returns the plaintext on success, or false on failure.