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ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt() public WP 1.0

Authenticated Encryption with Associated Data: Decryption

Algorithm:

AES-256-GCM

This mode uses a 64-bit random nonce with a 64-bit counter. IETF mode uses a 96-bit random nonce with a 32-bit counter.

Это метод класса: ParagonIE_Sodium_Compat{}

Хуков нет.

Возвращает

Строку/true/false. The original plaintext message

Использование

$result = ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt(;
$ciphertext(строка) (обязательный)
Encrypted message (with Poly1305 MAC appended)
$assocData(строка) (обязательный)
Authenticated Associated Data (unencrypted)
$nonce(строка) (обязательный)
Number to be used only Once; must be 8 bytes
$key(строка) (обязательный)
Encryption key

Код ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt() WP 5.5.1

<?php
public static function crypto_aead_aes256gcm_decrypt(
    $ciphertext = '',
    $assocData = '',
    $nonce = '',
    $key = ''
) {
    if (!self::crypto_aead_aes256gcm_is_available()) {
        throw new SodiumException('AES-256-GCM is not available');
    }
    ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
    ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
    ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
    ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);

    /* Input validation: */
    if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
        throw new SodiumException('Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long');
    }
    if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
        throw new SodiumException('Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long');
    }
    if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_AES256GCM_ABYTES) {
        throw new SodiumException('Message must be at least CRYPTO_AEAD_AES256GCM_ABYTES long');
    }
    if (!is_callable('openssl_decrypt')) {
        throw new SodiumException('The OpenSSL extension is not installed, or openssl_decrypt() is not available');
    }

    /** @var string $ctext */
    $ctext = ParagonIE_Sodium_Core_Util::substr($ciphertext, 0, -self::CRYPTO_AEAD_AES256GCM_ABYTES);
    /** @var string $authTag */
    $authTag = ParagonIE_Sodium_Core_Util::substr($ciphertext, -self::CRYPTO_AEAD_AES256GCM_ABYTES, 16);
    return openssl_decrypt(
        $ctext,
        'aes-256-gcm',
        $key,
        OPENSSL_RAW_DATA,
        $nonce,
        $authTag,
        $assocData
    );
}