.net 加密算法_.NET_编程开发_程序员俱乐部

public?static?string?Encrypt(string?source)
????????{
????????????MD5CryptoServiceProvider?md5?=?new?MD5CryptoServiceProvider();
????????????byte[]?bytes?=?Encoding.UTF8.GetBytes(source);
????????????byte[]?output?=?md5.ComputeHash(bytes);

????????????return?BitConverter.ToString(output);
????????}
最常见的MD5加密，但不带解密。

DES加解密。
??public?class?DES
????{
????????private?const?string?key?=?"av&6^3*E";
???????
????????public?static?string?Encrypt(string?source)
????????{
????????????DESCryptoServiceProvider?des?=?new?DESCryptoServiceProvider();

????????????byte[]?bytes?=?Encoding.UTF8.GetBytes(source);

????????????des.Key?=?ASCIIEncoding.ASCII.GetBytes(key);
????????????des.IV?=?ASCIIEncoding.ASCII.GetBytes(key);

????????????MemoryStream?ms?=?new?MemoryStream();
????????????CryptoStream?cs?=?new?CryptoStream(ms,?des.CreateEncryptor(),?CryptoStreamMode.Write);

????????????cs.Write(bytes,?0,?bytes.Length);
????????????cs.FlushFinalBlock();

????????????StringBuilder?sb?=?new?StringBuilder();
????????????foreach?(byte?b?in?ms.ToArray())
????????????{
????????????????sb.AppendFormat("{0:X2}",?b);
????????????}

????????????return?sb.ToString();
????????}

????????public?static?string?Decrypt(string?source)
????????{
????????????if?(source?==?null?||?source.Length?==?0)
????????????{
????????????????return?source;
????????????}

????????????DESCryptoServiceProvider?des?=?new?DESCryptoServiceProvider();
????????????byte[]?bytes?=?new?byte[source.Length?/?2];
????????????for?(int?x?=?0;?x?<?source.Length?/?2;?x++)
????????????{
????????????????int?i?=?(Convert.ToInt32(source.Substring(x?*?2,?2),?16));
????????????????bytes[x]?=?(byte)i;
????????????}

????????????des.Key?=?ASCIIEncoding.ASCII.GetBytes(key);
????????????des.IV?=?ASCIIEncoding.ASCII.GetBytes(key);

????????????MemoryStream?ms?=?new?MemoryStream();
????????????CryptoStream?cs?=?new?CryptoStream(ms,?des.CreateDecryptor(),?CryptoStreamMode.Write);
????????????cs.Write(bytes,?0,?bytes.Length);
????????????cs.FlushFinalBlock();

????????????return?Encoding.UTF8.GetString(ms.ToArray());
????????}
????}