/// <summary>
/// 获取加密和解密时用的key和iv
/// </summary>
/// <param name="providerType">算法类型</param>
/// <param name="key"></param>
/// <param name="iv"></param>
public static void GenerateCryptKeyAndIV(CryptProviderType providerType, out byte[] key, out byte[] iv)
{
key = null;
iv = null;
switch (providerType)
{
case CryptProviderType.AES:
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
aes.GenerateKey();
aes.GenerateIV();
key = aes.Key;
iv = aes.IV;
return;
case CryptProviderType.DES:
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.GenerateKey();
des.GenerateIV();
key = des.Key;
iv = des.IV;
return;
case CryptProviderType.TripleDES:
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.GenerateKey();
tdes.GenerateIV();
key = tdes.Key;
iv = tdes.IV;
return;
default:
return;
}
}
public static extern bool CryptAcquireContext(
out IntPtr prov,
[MarshalAs(UnmanagedType.LPTStr)]
string container,
[MarshalAs(UnmanagedType.LPTStr)]
string provider,
[MarshalAs(UnmanagedType.U4)]
CryptProviderType provType,
[MarshalAs(UnmanagedType.U4)]
CryptAcquireContextFlags flags);
/// <summary>
/// 对字符串进行加密
/// </summary>
/// <param name="input">字符串</param>
/// <param name="providerType">加密算法类型</param>
/// <returns></returns>
public static string Encrypt(string input, byte[] key, byte[] iv, CryptProviderType providerType)
{
MemoryStream mstream = new MemoryStream();
CryptoStream cstream = null;
switch (providerType)
{
case CryptProviderType.AES:
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
cstream = new CryptoStream(mstream, aes.CreateEncryptor(key, iv), CryptoStreamMode.Write);
break;
case CryptProviderType.DES:
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
cstream = new CryptoStream(mstream, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);
break;
case CryptProviderType.TripleDES:
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
cstream = new CryptoStream(mstream, tdes.CreateEncryptor(key, iv), CryptoStreamMode.Write);
break;
default:
break;
}
if (cstream == null)
{
mstream.Close();
return(input);
}
else
{
byte[] ibuffer = Encoding.Default.GetBytes(input);
cstream.Write(ibuffer, 0, ibuffer.Length);
cstream.FlushFinalBlock();
string output = Convert.ToBase64String(mstream.ToArray());
cstream.Close();
mstream.Close();
return(output);
}
}
