.Net对图片加密解密的方法

可能有朋友想对一张图片加密？(这样的描述是否很奇怪。)

然后自己可以解密，而别人不行？

那么不妨有个思路就是读入文件，然后对其二进制代码进行加密~揭秘的时候反之即可。

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Security.Cryptography; 
using System.IO; 
namespace Net.Template.Common 
{ 
/// <summary>  /// 对图片的加密和解密  /// </summary> 
public class DEncrypt4ImageHelper 
{ 
public DEncrypt4ImageHelper() { } 
#region 加密方法 图片加密 
/// <summary>  /// 图片加密  /// </summary>  /// <param name="filePath">源文件</param>  /// <param name="savePath">保存为文件名称</param>  /// <param name="keyStr">密钥</param> 
public static void EncryptFile(string filePath, string savePath, string keyStr) 
{ 
//通过des加密 
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
//通过流打开文件 
FileStream fs = File.OpenRead(filePath); 
//获取文件二进制字符  byte[] inputByteArray = newbyte[fs.Length]; 
//读流文件 
fs.Read(inputByteArray, 0, (int)fs.Length); 
//关闭流 
fs.Close(); 
//获得加密字符串二进制字符  byte[] keyByteArray = Encoding.Default.GetBytes(keyStr); 
//计算指定字节组指定区域哈希值 
SHA1 ha = new SHA1Managed(); 
byte[] hb = ha.ComputeHash(keyByteArray); 
//加密密钥数组  byte[] sKey = newbyte[8]; 
//加密变量  byte[] sIV = newbyte[8]; 
for (int i = 0; i < 8; i++) 
sKey[i] = hb[i]; 
for (int i = 8; i < 16; i++) 
sIV[i - 8] = hb[i]; 
//获取加密密钥 
des.Key = sKey; 
//设置加密初始化向量 
des.IV = sIV; 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); 
cs.Write(inputByteArray, 0, inputByteArray.Length); 
cs.FlushFinalBlock(); 
fs = File.OpenWrite(savePath); 
foreach (byte b in ms.ToArray()) 
{
fs.WriteByte(b); 
} 
fs.Close(); 
cs.Close(); 
ms.Close(); 
} 
#endregion#region 解密方法 图片解密 
/// <summary>  /// 图片解密  /// </summary>  /// <param name="filePath">源文件</param>  /// <param name="savePath">保存文件</param>  /// <param name="keyStr">密钥</param> 
public static void DecryptFile(string filePath, string savePath, string keyStr) 
{ 
//通过des解密 
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
//通过流读取文件 
FileStream fs = File.OpenRead(filePath); 
//获取文件二进制字符  byte[] inputByteArray = newbyte[fs.Length]; 
//读取流文件 
fs.Read(inputByteArray, 0, (int)fs.Length); 
//关闭流 
fs.Close(); 
//密钥数组  byte[] keyByteArray = Encoding.Default.GetBytes(keyStr); 
//定义哈希变量 
SHA1 ha = new SHA1Managed(); 
//计算指定字节组指定区域哈希值  byte[] hb = ha.ComputeHash(keyByteArray); 
//加密密钥数组  byte[] sKey = newbyte[8]; 
//加密变量  byte[] sIV = newbyte[8]; 
for (int i = 0; i < 8; i++) 
sKey[i] = hb[i]; 
for (int i = 8; i < 16; i++) 
sIV[i - 8] = hb[i]; 
//获取加密密钥 
des.Key = sKey; 
//加密变量 
des.IV = sIV; 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); 
cs.Write(inputByteArray, 0, inputByteArray.Length); 
cs.FlushFinalBlock(); 
fs = File.OpenWrite(savePath); 
foreach (byte b in ms.ToArray()) 
{ 
fs.WriteByte(b); 
} 
fs.Close(); 
cs.Close(); 
ms.Close(); 
} 
#endregion 
} 
}