/// <summary>将某种格式的密文转为加密后的二进制数据</summary>
/// <param name="ciphertext">密文</param>
/// <param name="format">密文格式</param>
/// <returns>加密后的二进制数据</returns>
public static byte[] FromCiphertext(string ciphertext, CiphertextFormat format)
{
byte[] result = null;
if (format == CiphertextFormat.Base64String)
{
result = Convert.FromBase64String(ciphertext);
}
else if (format == CiphertextFormat.HexString)
{
string[] data = ciphertext.Split('-');
result = new byte[data.Length];
Int32Converter converter = new Int32Converter();
for (int i = 0; i < data.Length; i++)
{
result[i] = Convert.ToByte(converter.ConvertFromInvariantString(string.Format("0x{0}", data[i])).ToString());
}
}
else if (format == CiphertextFormat.HexStringWhitoutHyphen)
{
result = new byte[ciphertext.Length / 2];
Int32Converter converter = new Int32Converter();
for (int i = 0; i < ciphertext.Length; i = i + 2)
{
result[i / 2] = Convert.ToByte(converter.ConvertFromInvariantString(string.Format("0x{0}", ciphertext.Substring(i, 2)).ToString()));
}
}
return(result);
}
/// <summary>
/// DES descrypt.
/// </summary>
/// <param name="i_key">Keys</param>
/// <param name="i_IV">initial vector</param>
/// <param name="i_data">Data</param>
/// <returns></returns>
public static string Decrypt(string i_key, string i_IV, string i_data)
{
string[] m_datas = i_data.Split('-');
byte[] m_values = new byte[m_datas.Length];
Int32Converter m_i32Converter = new Int32Converter();
for (int i = 0; i < m_datas.Length; i++)
{
m_values[i] = Convert.ToByte(m_i32Converter.ConvertFromInvariantString("0x" + m_datas[i]).ToString());
}
byte[] m_keys = Encoding.ASCII.GetBytes(i_key);
byte[] m_IVs = Encoding.ASCII.GetBytes(i_IV);
byte[] m_data = Encoding.ASCII.GetBytes(i_data);
DESCryptoServiceProvider m_DES = new DESCryptoServiceProvider();
ICryptoTransform m_decrypt = m_DES.CreateDecryptor(m_keys, m_IVs);
byte[] m_result = m_decrypt.TransformFinalBlock(m_values, 0, m_values.Length);
m_decrypt.Dispose();
m_DES.Clear();
return(Encoding.ASCII.GetString(m_result));
}