DES加解密方法（C#和android通用）
16lz
2021-01-23
http://www.cnblogs.com/prince3245/archive/2010/03/23/1692630.html
C#版本
#region 密钥 private static string key = "abcd1234"; //密钥(长度必须8位以上) #endregion #region DES加密 public static string EncryptString(string pToEncrypt) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt); des.Key = UTF8Encoding.UTF8.GetBytes(key); des.IV = UTF8Encoding.UTF8.GetBytes(key); 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); } ret.ToString(); return ret.ToString(); } #endregion #region DES解密 public static string DecryptString(string pToDecrypt) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 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; } des.Key = UTF8Encoding.UTF8.GetBytes(key); des.IV = UTF8Encoding.UTF8.GetBytes(key); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = new StringBuilder(); return Encoding.UTF8.GetString(ms.ToArray()); } #endregion
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