/// <summary>
/// 加密解密帮助类
/// </summary>
public static class EncryptHelper
{
#region des实现
/// <summary>
/// Des默认密钥向量
/// </summary>
public static byte[] DesIv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
/// <summary>
/// Des加解密钥必须8位
/// </summary>
public const string DesKey = "deskey8w";
/// <summary>
/// 获取Des8位密钥
/// </summary>
/// <param name="key">Des密钥字符串</param>
/// <returns>Des8位密钥</returns>
public static byte[] GetDesKey(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", "Des密钥不能为空");
}
if (key.Length > 8)
{
key = key.Substring(0, 8);
}
if (key.Length < 8)
{
// 不足8补全
key = key.PadRight(8, '0');
}
return Encoding.UTF8.GetBytes(key);
}
/// <summary>
/// Des加密
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="key">des密钥，长度必须8位</param>
/// <param name="iv">密钥向量</param>
/// <returns>加密后的字符串</returns>
public static string DesEncrypt(string source, string key, byte[] iv)
{
using (DES des = DES.Create())
{
byte[] rgbKeys = GetDesKey(key),
rgbIvs = iv,
inputByteArray = Encoding.UTF8.GetBytes(source);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, des.CreateEncryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write))
{
cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);
cryptoStream.FlushFinalBlock();
// 1.第一种
return Convert.ToBase64String(memoryStream.ToArray());
// 2.第二种
//StringBuilder result = new StringBuilder();
//foreach (byte b in memoryStream.ToArray())
//{
// result.AppendFormat("{0:X2}", b);
//}
//return result.ToString();
}
}
}
}
/// <summary>
/// Des解密
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="key">des密钥，长度必须8位</param>
/// <param name="iv">密钥向量</param>
/// <returns>解密后的字符串</returns>
public static string DesDecrypt(string source, string key, byte[] iv)
{
using (DES des = DES.Create())
{
byte[] rgbKeys = GetDesKey(key),
rgbIvs = iv,
inputByteArray = Convert.FromBase64String(source);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, des.CreateDecryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write))
{
cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);
cryptoStream.FlushFinalBlock();
return Encoding.UTF8.GetString(memoryStream.ToArray());
}
}
}
}
#endregion
#region aes实现
/// <summary>
/// Aes加解密钥必须32位
/// </summary>
public const string AesKey = "asekey32w";
/// <summary>
/// 获取Aes32位密钥
/// </summary>
/// <param name="key">Aes密钥字符串</param>
/// <returns>Aes32位密钥</returns>
public static byte[] GetAesKey(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", "Aes密钥不能为空");
}
if (key.Length < 32)
{
// 不足32补全
key = key.PadRight(32, '0');
}
if (key.Length > 32)
{
key = key.Substring(0, 32);
}
return Encoding.UTF8.GetBytes(key);
}
/// <summary>
/// Aes加密
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="key">aes密钥，长度必须32位</param>
/// <returns>加密后的字符串</returns>
public static string AesEncrypt(string source, string key)
{
using (Aes aes = Aes.Create())
{
aes.Key = GetAesKey(key);
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
using (ICryptoTransform cryptoTransform = aes.CreateEncryptor())
{
byte[] inputBuffers = Encoding.UTF8.GetBytes(source);
byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
aes.Clear();
aes.Dispose();
return Convert.ToBase64String(results, 0, results.Length);
}
}
}
/// <summary>
/// Aes解密
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="key">aes密钥，长度必须32位</param>
/// <returns>解密后的字符串</returns>
public static string AesDecrypt(string source, string key)
{
using (Aes aes = Aes.Create())
{
aes.Key = GetAesKey(key);
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
using (ICryptoTransform cryptoTransform = aes.CreateDecryptor())
{
byte[] inputBuffers = Convert.FromBase64String(source);
byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
aes.Clear();
return Encoding.UTF8.GetString(results);
}
}
}
#endregion
}
