sodium_crypto_aead_chacha20poly1305_decrypt

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_aead_chacha20poly1305_decrypt — Verify then decrypt with ChaCha20-Poly1305

sodium_crypto_aead_chacha20poly1305_decrypt(
    string $ciphertext,
    string $additional_data,
    string $nonce,
    #[\SensitiveParameter] string $key
): string|false

Verify then decrypt with ChaCha20-Poly1305.

ciphertext: Must be in the format provided by sodium_crypto_aead_chacha20poly1305_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. 8 bytes long.
key: Encryption key (256-bit).

Returns the plaintext on success, or false on failure.