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。
下面是演示代码~
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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
}
}
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本文转自 OH51888 51CTO博客，原文链接：http://blog.51cto.com/rozbo/1286420，如需转载请自行联系原作者
