public static string generate(TokenCryptoData tokenCryptoData, byte[] tokenSeed, byte[] entropy)
{
int num = (entropy != null) ? (entropy.Length + 8) : 8;
long _movingFactor = tokenCryptoData.CryptoData.MovingFactor;
int[] DIGITS_POWER = new int[]
{
1,
10,
100,
1000,
10000,
100000,
1000000,
10000000,
100000000
};
byte[] buffer = new byte[num];
byte[] buffer2 = new byte[20];
string result;
try
{
for (int i = num - 1; i >= 0; i--)
{
if (num - i <= 8)
{
buffer[i] = (byte)(_movingFactor & 255L);
_movingFactor >>= 8;
}
else
{
buffer[i] = entropy[i];
}
}
buffer2 = CryptoEngineHMACSHA1.process(tokenSeed, buffer, SHA1HashFunction.HashSize);
int index = (int)(buffer2[buffer2.Length - 1] & 15);
if (0 <= tokenCryptoData.TokenBaseParams.OTPOffSet && tokenCryptoData.TokenBaseParams.OTPOffSet < buffer2.Length - 4)
{
index = tokenCryptoData.TokenBaseParams.OTPOffSet;
}
int num2 = (int)(buffer2[index] & 127) << 24 | (int)(buffer2[index + 1] & 255) << 16 | (int)(buffer2[index + 2] & 255) << 8 | (int)(buffer2[index + 3] & 255);
int num3 = num2 % DIGITS_POWER[tokenCryptoData.TokenBaseParams.OTPTotalDigits];
result = Convert.ToString(num3, 10).PadLeft(tokenCryptoData.TokenBaseParams.OTPTotalDigits, '0');
}
catch (Exception ex)
{
SAFLOGGER.Write(SAFLOGGER.LOGGEREventID.EXCEPTION, "SAFCORE", new string[]
{
"http://sfexpand.SAFCore.HOTPPwdGenerator.softfinanca.com/",
Assembly.GetExecutingAssembly().FullName.ToString(),
ex.ToString()
});
result = null;
}
finally
{
}
return(result);
}
public static string generate(TokenCryptoData tokenCryptoData, byte[] tokenSeed, byte[] entropy)
{
int num = (entropy != null) ? (entropy.Length + 8) : 8;
long num2 = tokenCryptoData.CryptoData.MovingFactor;
byte[] array = new byte[num];
byte[] array2 = new byte[20];
int[] array3 = new int[]
{
1,
10,
100,
1000,
10000,
100000,
1000000,
10000000,
100000000
};
for (int i = num - 1; i >= 0; i--)
{
if (num - i <= 8)
{
array[i] = (byte)(num2 & 255L);
num2 >>= 8;
}
else
{
array[i] = entropy[i];
}
}
array2 = CryptoEngineHMACSHA1.process(tokenSeed, array, SHA1HashFunction.HashSize);
int num3 = (int)(array2[array2.Length - 1] & 15);
if (0 <= tokenCryptoData.TokenBaseParams.OTPOffSet && tokenCryptoData.TokenBaseParams.OTPOffSet < array2.Length - 4)
{
num3 = tokenCryptoData.TokenBaseParams.OTPOffSet;
}
int num4 = (int)(array2[num3] & 127) << 24 | (int)(array2[num3 + 1] & 255) << 16 | (int)(array2[num3 + 2] & 255) << 8 | (int)(array2[num3 + 3] & 255);
int value = num4 % array3[tokenCryptoData.TokenBaseParams.OTPTotalDigits];
return(Convert.ToString(value, 10).PadLeft(tokenCryptoData.TokenBaseParams.OTPTotalDigits, '0'));
}