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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

sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
 string $ciphertext,
 string $additional_data,
 string $nonce,
 #[\SensitiveParameter] 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.

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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.sodium-crypto-aead-chacha20poly1305-ietf-decrypt.php