Rijndael对称算法
时间: 2023-10-12 10:05:25 浏览: 43
Rijndael是一种对称分组加密算法,它的分组大小和密钥长度可变。该算法基于置换和代替操作来实现加密。 Rijndael算法采用有限域,其中Rijndael256使用的是特定的约多项式,其对应的十六进制数字为‘011B’。 对于Rijndael算法的最大轮数设置,Rijndael256的最大轮数是14。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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相关问题
. Rijndael算法
Rijndael算法是一种高级加密标准(AES)的候选算法,它是由美国国家标准与技术协会(NIST)所选定的。该算法在密码学中被广泛应用于数据加密和解密的过程中。Rijndael算法是一种对称密钥算法,意味着加密和解密使用相同的密钥。它可以用于保护敏感数据的机密性,确保数据在传输和存储过程中不被未经授权的人访问。
Rijndael算法的实现可以使用不同的编程语言,例如C#。下面是一个使用C#实现Rijndael算法的示例:
```csharp
using System;
using System.Security.Cryptography;
using System.Text;
public class RijndaelExample
{
public static void Main()
{
string plainText = "Hello, World!";
string key = "ThisIsARijndaelKey";
string iv = "ThisIsARijndaelIV";
byte[] encryptedBytes = EncryptString(plainText, key, iv);
string encryptedText = Convert.ToBase64String(encryptedBytes);
Console.WriteLine("Encrypted Text: " + encryptedText);
string decryptedText = DecryptString(encryptedBytes, key, iv);
Console.WriteLine("Decrypted Text: " + decryptedText);
}
public static byte[] EncryptString(string plainText, string key, string iv)
{
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
using (RijndaelManaged rijndael = new RijndaelManaged())
{
rijndael.Key = keyBytes;
rijndael.IV = ivBytes;
ICryptoTransform encryptor = rijndael.CreateEncryptor(rijndael.Key, rijndael.IV);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter sw = new StreamWriter(cs))
{
sw.Write(plainText);
}
}
return ms.ToArray();
}
}
}
public static string DecryptString(byte[] encryptedBytes, string key, string iv)
{
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
using (RijndaelManaged rijndael = new RijndaelManaged())
{
rijndael.Key = keyBytes;
rijndael.IV = ivBytes;
ICryptoTransform decryptor = rijndael.CreateDecryptor(rijndael.Key, rijndael.IV);
using (MemoryStream ms = new MemoryStream(encryptedBytes))
{
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
using (StreamReader sr = new StreamReader(cs))
{
return sr.ReadToEnd();
}
}
}
}
}
}
```
这个示例演示了如何使用C#编写的Rijndael算法进行文本加密和解密。在示例中,我们使用了一个密钥和一个初始化向量(IV)来加密和解密文本。加密后的文本以Base64字符串的形式进行存储和传输。
php rijndael
Rijndael是一种对称密钥加密算法,它是AES(Advanced Encryption Standard)的前身。在PHP中使用Rijndael算法进行加解密可以使用mcrypt扩展。以下是一个简单的例子:
```php
$key = 'mykey';
$message = 'hello world';
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
$encryptedMessage = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $message, MCRYPT_MODE_CBC, $iv);
$decryptedMessage = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encryptedMessage, MCRYPT_MODE_CBC, $iv);
```
在上面的例子中,我们使用了128位的Rijndael算法,并使用CBC模式和随机生成的IV来加密和解密消息。请注意,mcrypt已经在PHP 7.2中被弃用,因此建议使用其他加密扩展或库。