文件加密＆字符加密的代码

///<summary>文件加密类 使用DES加密文件流</summary>
///<param>desKey: DES的密钥；desIV: DES向量</param>

class encrypfile{
public byte[] desKey;
public byte[] desIV;

public encrypfile(byte[] inputKey,byte[] inputIV){
desKey=inputKey;
desIV=inputIV;

}

///<summary>加密主方法</summary>
///<param>inName:被加密文件名；outName: 加密后文件名</param>
public void begintoencry(string inName,string outName){
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength(0);

byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
long rdlen = 0; //This is the total number of bytes written.
long totlen = fin.Length; //This is the total length of the input file.
int len; //This is the number of bytes to be written at a time.
DES des = new DESCryptoServiceProvider();
CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);

while(rdlen < totlen)
{
len = fin.Read(bin, 0, 100);
encStream.Write(bin, 0, len);
rdlen = rdlen + len;
}

encStream.Close();
fout.Close();
fin.Close();
}
}

加密字符流
//pToEncrypt为需要加密字符串,sKey为密钥
public string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//把字符串放到byte数组中
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

//建立加密对象的密钥和向量
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach(byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
return ret.ToString();
}

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