sodium_crypto_secretbox_open
(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_secretbox_open — Authenticated shared-key decryption
说明
sodium_crypto_secretbox_open(string
$ciphertext
, string $nonce
, string $key
): string|falseDecrypt 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
-
If
nonce
has a length of bytes different thanSODIUM_CRYPTO_SECRETBOX_NONCEBYTES
(24 bytes), a SodiumException will be thrown. -
If
key
has a length of bytes different thanSODIUM_CRYPTO_SECRETBOX_KEYBYTES
(32 bytes), a SodiumException will be thrown.
范例
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 nouce and key are required to decrypt the $ciphertext
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
if ($plaintext !== false) {
echo $plaintext . PHP_EOL;
}
?>
以上例程会输出:
message to be encrypted
参见
- sodium_crypto_secretbox() - Authenticated shared-key encryption
- sodium_crypto_secretbox_keygen() - Generate random key for sodium_crypto_secretbox
- random_bytes() - Generates cryptographically secure pseudo-random bytes
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User Contributed Notes 1 note
khalyomede at gmail dot com ¶
3 years ago
This method will return a string, or false if the data failed to be decrypted.
$key = 'secret';
$data = 'binarydata';
$nonce = random_bytes(SODIUM_CRYPT_SECRETBOX_NONCEBYTES);
$decrypted = sodium_crypto_secretbox_open($data, $nonce, $key);
if ($decrypted === false) {
throw new Exception('failed to decrypt data');
}
备份地址:http://www.lvesu.com/blog/php/function.sodium-crypto-secretbox-open.php