private string RODecryptString(string inStr, string inKey)
{
try
{
var hasher = new ROHasher(DesMD5);
byte[] encryptedData = Convert.FromBase64String(inStr);
byte ver = encryptedData[0];
int ivSize = 0;
if (ver == 1)
{
ivSize = 8;
}
else if (ver == 2)
{
ivSize = 16;
}
else
{
throw new Exception("unsupported encryption version");
}
SymmetricAlgorithm cipher = ver == 1 ? (SymmetricAlgorithm) new TripleDESCryptoServiceProvider() : (SymmetricAlgorithm) new AesCryptoServiceProvider();
foreach (string key in (inKey ?? "")
.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
.Where(s => !string.IsNullOrEmpty(s.Trim()))
.Select(s => s.Trim())
)
{
try
{
cipher.IV = encryptedData.Skip(1).Take(ivSize).ToArray();
cipher.Mode = CipherMode.CBC;
cipher.Key = hasher.ComputeHash(UTF8Encoding.UTF8.GetBytes(key)).Take(DesMD5 ? 16 : 32).ToArray();
string outStr = UTF8Encoding.UTF8.GetString(cipher.CreateDecryptor().TransformFinalBlock(encryptedData.Skip(1 + ivSize).ToArray(), 0, encryptedData.Length - (1 + ivSize)));
return(outStr);
}
catch
{
}
}
throw new Exception("no suitable secret column keys");
}
catch {
throw;
}
}
private string RODecryptString(string inStr, string inKey)
{
try
{
var hasher = new ROHasher(DesMD5);
byte[] encryptedData = Convert.FromBase64String(inStr);
byte ver = encryptedData[0];
int ivSize = 0;
if (ver == 1)
{
ivSize = 8;
}
else if (ver == 2)
{
ivSize = 16;
}
else
{
throw new Exception("unsupported encryption version");
}
SymmetricAlgorithm cipher = ver == 1 ? (SymmetricAlgorithm) new TripleDESCryptoServiceProvider() : (SymmetricAlgorithm) new AesCryptoServiceProvider();
try
{
cipher.IV = encryptedData.Skip(1).Take(ivSize).ToArray();
cipher.Mode = CipherMode.CBC;
cipher.Key = hasher.ComputeHash(UTF8Encoding.UTF8.GetBytes(inKey)).Take(DesMD5 ? 16 : 32).ToArray();
string outStr = UTF8Encoding.UTF8.GetString(cipher.CreateDecryptor().TransformFinalBlock(encryptedData.Skip(1 + ivSize).ToArray(), 0, encryptedData.Length - (1 + ivSize)));
return(outStr);
}
catch
{
return(null);
}
}
catch {
return(null);
}
}
private string ROEncryptString(string inStr, string inKey)
{
string outStr = string.Empty;
RandomNumberGenerator rng = new RNGCryptoServiceProvider();
// general format
// base64(version byte + byte[] of IV + encrypted content) + '-' + visible tail portion
// version 1 3DES CBC with 8 byte IV
// version 2 AES256 CBC with 16 byte IV
byte[] ver = new byte[] { (byte)(DesMD5 ? 1 : 2) };
byte[] iv = new byte[DesMD5 ? 8 : 16];
rng.GetBytes(iv);
var hasher = new ROHasher(DesMD5);
SymmetricAlgorithm cipher = DesMD5 ? (SymmetricAlgorithm) new TripleDESCryptoServiceProvider() : (SymmetricAlgorithm) new AesCryptoServiceProvider();
cipher.Mode = CipherMode.CBC;
cipher.IV = iv;
cipher.Key = hasher.ComputeHash(UTF8Encoding.UTF8.GetBytes(inKey)).Take(DesMD5 ? 16 : 32).ToArray();
byte[] encryptedBlock = cipher.CreateEncryptor().TransformFinalBlock(UTF8Encoding.UTF8.GetBytes(inStr), 0, UTF8Encoding.UTF8.GetBytes(inStr).Length);
outStr = Convert.ToBase64String(ver.Concat(iv).Concat(encryptedBlock).ToArray());
return(outStr);
}
