// Token: 0x060000A1 RID: 161 RVA: 0x00009650 File Offset: 0x00007850
public static string Decrypt(byte[] encryptedBytes, byte[] key, byte[] iv)
{
string text = string.Empty;
string result;
try
{
GcmBlockCipher gcmBlockCipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(key), 128, iv, null);
gcmBlockCipher.Init(false, parameters);
byte[] array = new byte[gcmBlockCipher.GetOutputSize(encryptedBytes.Length)];
int outOff = gcmBlockCipher.ProcessBytes(encryptedBytes, 0, encryptedBytes.Length, array, 0);
gcmBlockCipher.DoFinal(array, outOff);
text = Encoding.UTF8.GetString(array).TrimEnd("\r\n\0".ToCharArray());
result = text;
}
catch
{
result = text;
}
return(result);
}
// Token: 0x06000069 RID: 105 RVA: 0x00007F28 File Offset: 0x00006128
public virtual void Init(bool forEncryption, ICipherParameters parameters)
{
this.bool_0 = forEncryption;
this.byte_7 = null;
if (parameters is AeadParameters)
{
AeadParameters aeadParameters = (AeadParameters)parameters;
this.byte_1 = aeadParameters.GetNonce();
this.byte_2 = aeadParameters.GetAssociatedText();
int macSize = aeadParameters.MacSize;
if (macSize < 96 || macSize > 128 || macSize % 8 != 0)
{
throw new ArgumentException("Invalid value for MAC size: " + macSize.ToString());
}
this.int_0 = macSize / 8;
this.keyParameter_0 = aeadParameters.Key;
}
else
{
if (!(parameters is ParametersWithIV))
{
throw new ArgumentException("invalid parameters passed to GCM");
}
ParametersWithIV parametersWithIV = (ParametersWithIV)parameters;
this.byte_1 = parametersWithIV.GetIV();
this.byte_2 = null;
this.int_0 = 16;
this.keyParameter_0 = (KeyParameter)parametersWithIV.Parameters;
}
int num = forEncryption ? 16 : (16 + this.int_0);
this.byte_6 = new byte[num];
if (this.byte_1 == null || this.byte_1.Length < 1)
{
throw new ArgumentException("IV must be at least 1 byte");
}
if (this.byte_2 == null)
{
this.byte_2 = new byte[0];
}
this.iblockCipher_0.Init(true, this.keyParameter_0);
this.byte_3 = new byte[16];
this.iblockCipher_0.ProcessBlock(this.byte_3, 0, this.byte_3, 0);
this.igcmMultiplier_0.Init(this.byte_3);
this.byte_4 = this.method_3(this.byte_2);
if (this.byte_1.Length == 12)
{
this.byte_5 = new byte[16];
Array.Copy(this.byte_1, 0, this.byte_5, 0, this.byte_1.Length);
this.byte_5[15] = 1;
}
else
{
this.byte_5 = this.method_3(this.byte_1);
byte[] byte_ = new byte[16];
GcmBlockCipher.smethod_0((ulong)((long)this.byte_1.Length * 8L), byte_, 8);
Class8.smethod_9(this.byte_5, byte_);
this.igcmMultiplier_0.MultiplyH(this.byte_5);
}
this.byte_8 = Arrays.Clone(this.byte_4);
this.byte_9 = Arrays.Clone(this.byte_5);
this.int_1 = 0;
this.ulong_0 = 0UL;
}