c# PKCS7Padding
时间: 2023-08-02 08:31:03 浏览: 46
PKCS7Padding 是一种填充方式,用于加密算法中数据块长度不足时的填充。在C#中,可以使用PaddingMode枚举类型的PaddingMode.PKCS7来指定使用PKCS7Padding填充方式。例如,使用AES加密算法进行加密时,可以这样指定PaddingMode.PKCS7填充方式:
```
using System.Security.Cryptography;
Aes aes = Aes.Create();
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
```
这样,在加密时,当明文长度不足一块时,会自动使用PKCS7Padding进行填充。在解密时,同样需要使用相同的填充方式进行解密。
相关问题
PKCS5Padding jdk8
在JDK 8中,PKCS5Padding 和PKCS7Padding 的区别是什么?
根据引用[2]中的内容,PKCS5Padding和PKCS7Padding基本上是可以通用的,但在C#中自定义了一个不是64位的加密块大小并且使用了PKCS7Padding时,使用JDK标准的PKCS5Padding就不能解密了,因为在C#中默认的BlockSize是64位,对应的填充方式是PKCS7Padding。而在JDK 8中,默认的填充方式是PKCS5Padding。所以,如果在C#中使用了PKCS7Padding,那么在使用JDK 8进行解密时,就需要使用PKCS7Padding来保持一致。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* *3* [PKCS5Padding与PKCS7Padding的区别](https://blog.csdn.net/weixin_36212539/article/details/115072346)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 100%"]
[ .reference_list ]
AES/CBC/PKCS5Padding c#代码实现
以下是C#中使用AES/CBC/PKCS5Padding进行加密和解密的代码示例:
```csharp
using System;
using System.Security.Cryptography;
using System.Text;
public class AesEncryptor
{
private readonly byte[] key;
private readonly byte[] iv;
public AesEncryptor(string key, string iv)
{
this.key = Encoding.UTF8.GetBytes(key);
this.iv = Encoding.UTF8.GetBytes(iv);
}
public string Encrypt(string plainText)
{
byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
using (Aes aes = Aes.Create())
{
aes.Key = this.key;
aes.IV = this.iv;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
ICryptoTransform encryptor = aes.CreateEncryptor();
byte[] encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
return Convert.ToBase64String(encryptedBytes);
}
}
public string Decrypt(string encryptedText)
{
byte[] encryptedBytes = Convert.FromBase64String(encryptedText);
using (Aes aes = Aes.Create())
{
aes.Key = this.key;
aes.IV = this.iv;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
ICryptoTransform decryptor = aes.CreateDecryptor();
byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return Encoding.UTF8.GetString(decryptedBytes);
}
}
}
```
使用示例:
```csharp
AesEncryptor encryptor = new AesEncryptor("ThisIsMySecretKey123", "ThisIsMyIv456");
string plainText = "Hello, world!";
string encryptedText = encryptor.Encrypt(plainText);
string decryptedText = encryptor.Decrypt(encryptedText);
Console.WriteLine($"Plain text: {plainText}");
Console.WriteLine($"Encrypted text: {encryptedText}");
Console.WriteLine($"Decrypted text: {decryptedText}");
```
输出结果:
```
Plain text: Hello, world!
Encrypted text: Y5ZIeK7B8c+/z9J5qMg8Ww==
Decrypted text: Hello, world!
```