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);
}
最もよく知られている MD5 加密ですが、解密ではありません。
DES 加解密。
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.CreateEncrypt or(), 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 (ソース == null || source.Length == 0)
{
return source;
}
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] bytes = 新しい 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] = (て)い;
}
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());
}
}