从COM组件调用.NET组件编程实战

//使得输入密码必须输入英文文本

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);

//Write the byte array into the crypto stream

//(It will end up in the memory stream)

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

//Get the data back from the memory stream, and into a string

StringBuilder ret = new StringBuilder();

foreach(byte b in ms.ToArray())

{

//Format as hex

ret.AppendFormat("{0:X2}", b);

}

ret.ToString();

return ret.ToString();

}

// 解密的方法

public string Decrypt(string pToDecrypt, string sKey)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//Put the input string into the byte array

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

for(int x = 0; x < pToDecrypt.Length / 2; x++)

{

int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i;

}

//建立加密对象的密钥和偏移量，此值重要，不能修改

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);