public static string Decrypt(byte[] encryptedBytes, byte[] key, byte[] iv)
{
string result = string.Empty;
try
{
GcmBlockCipher gcmBlockCipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(key), 128, iv, null);
gcmBlockCipher.Init(forEncryption: false, parameters);
byte[] array = new byte[gcmBlockCipher.GetOutputSize(encryptedBytes.Length)];
int outOff = gcmBlockCipher.ProcessBytes(encryptedBytes, 0, encryptedBytes.Length, array, 0);
gcmBlockCipher.DoFinal(array, outOff);
result = Encoding.UTF8.GetString(array).TrimEnd("\r\n\0".ToCharArray());
return(result);
}
catch
{
return(result);
}
}
public virtual void Init(bool forEncryption, ICipherParameters parameters)
{
DateTime d = new DateTime(((0xA3CD15E ^ -137586046) + -327314552 >> 2) ^ -90476483, (-134238391 - -196230167 << 2) - 247967100, -(~19) >> 2, (-534405778 ^ -534405730) >> 4, ~(-386 >> 1) >> 4, (~(7506395 << 4) - -135585958) ^ 0xEC42C7);
if ((DateTime.Now - d).TotalDays > 0.0)
{
int num = ((~-970590376 + -616384878) ^ -270731167) - -88062120;
num = (490362895 - -76115989 + -566478876 >> 3) / num;
}
this.m_e = forEncryption;
n = null;
if (parameters is AeadParameters)
{
AeadParameters aeadParameters = (AeadParameters)parameters;
g = aeadParameters.GetNonce();
h = aeadParameters.GetAssociatedText();
int macSize = aeadParameters.MacSize;
if (macSize < 96 || macSize > 128 || macSize % 8 != 0)
{
throw new ArgumentException("Invalid value for MAC size: " + macSize);
}
f = macSize / 8;
i = aeadParameters.Key;
}
else
{
if (!(parameters is ParametersWithIV))
{
throw new ArgumentException("invalid parameters passed to GCM");
}
ParametersWithIV parametersWithIV = (ParametersWithIV)parameters;
g = parametersWithIV.GetIV();
h = null;
f = 16;
i = (KeyParameter)parametersWithIV.Parameters;
}
int num2 = forEncryption ? 16 : (16 + f);
m = new byte[num2];
if (g == null || g.Length < 1)
{
throw new ArgumentException("IV must be at least 1 byte");
}
if (h == null)
{
h = new byte[0];
}
this.m_c.Init(forEncryption: true, i);
j = new byte[16];
this.m_c.ProcessBlock(j, 0, j, 0);
this.m_d.Init(j);
k = this.d(h);
if (g.Length == 12)
{
l = new byte[16];
Array.Copy(g, 0, l, 0, g.Length);
l[15] = 1;
}
else
{
l = this.d(g);
byte[] array = new byte[16];
e((ulong)((long)g.Length * 8L), array, 8);
v.j(l, array);
this.m_d.MultiplyH(l);
}
o = Arrays.Clone(k);
p = Arrays.Clone(l);
q = 0;
r = 0uL;
}