.NET下对二进制文件进行加密解密(C#)
下面的类实现了文件的加密和解密操作,试验了几种文件类型均没有问题,现在和大家共享一下。
namespace MyCryptoHelp
{
/// <summary>
/// 异常处理类
/// </summary>
public class CryptoHelpException : ApplicationException
{
public CryptoHelpException(string msg):base(msg){}
}
/// <summary>
/// CryptHelp
/// </summary>
public class CryptoHelp
{
private const ulong FC_TAG = 0xFC010203040506CF;
private const int BUFFER_SIZE = 128*1024;
/// <summary>
/// 检验两个Byte数组是否相同
/// </summary>
/// <param name="b1">Byte数组</param>
/// <param name="b2">Byte数组</param>
/// <returns>true-相等</returns>
private static bool CheckByteArrays(byte[] b1, byte[] b2)
{
if(b1.Length == b2.Length)
{
for(int i = 0; i < b1.Length; ++i)
{
if(b1[i] != b2[i])
return false;
}
return true;
}
return false;
}
/// <summary>
/// 创建Rijndael SymmetricAlgorithm
/// </summary>
/// <param name="password">密码</param>
/// <param name="salt"></param>
/// <returns>加密对象</returns>
private static SymmetricAlgorithm CreateRijndael(string password, byte[] salt)
{
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password,salt,"SHA256",1000);
SymmetricAlgorithm sma = Rijndael.Create();
sma.KeySize = 256;
sma.Key = pdb.GetBytes(32);
sma.Padding = PaddingMode.PKCS7;
return sma;
}
/// <summary>
/// 加密文件随机数生成
/// </summary>
private static RandomNumberGenerator rand = new RNGCryptoServiceProvider();
/// <summary>
/// 生成指定长度的随机Byte数组
/// </summary>
/// <param name="count">Byte数组长度</param>
/// <returns>随机Byte数组</returns>
private static byte[] GenerateRandomBytes(int count)
{
byte[] bytes = new byte[count];
rand.GetBytes(bytes);
return bytes;
}
/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">待加密文件</param>
/// <param name="outFile">加密后输入文件</param>
/// <param name="password">加密密码</param>
public static void EncryptFile(string inFile, string outFile, string password)
{
using(FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
long lSize = fin.Length; // 输入文件长度
int size = (int)lSize;
byte[] bytes = new byte[BUFFER_SIZE]; // 缓存
int read = -1; // 输入文件读取数量
int value = 0;
// 获取IV和salt
byte[] IV = GenerateRandomBytes(16);
byte[] salt = GenerateRandomBytes(16);
// 创建加密对象
SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt);
sma.IV = IV;
// 在输出文件开始部分写入IV和salt
fout.Write(IV,0,IV.Length);
fout.Write(salt,0,salt.Length)
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