sodium_crypto_secretbox_open

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_secretbox_openAuthenticated shared-key decryption

说明

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

Decrypt an encrypted message with a symmetric (shared) key.

参数

ciphertext

Must be in the format provided by sodium_crypto_secretbox() (ciphertext and tag, concatenated).

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).

返回值

The decrypted string on success 或者在失败时返回 false.

错误/异常

示例

示例 #1 sodium_crypto_secretbox_open() example

<?php
// The $key must be kept confidential
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
// Do not reuse $nonce with the same key
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox('message to be encrypted', $nonce, $key);

// The same nonce and key are required to decrypt the $ciphertext
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
if (
$plaintext !== false) {
echo
$plaintext . PHP_EOL;
}
?>

以上示例会输出:

message to be encrypted

参见