public static short FindAlgMaxLenght(OtpAlgorithmEnum alg, OtpValueTypeEnum valueType)
{
short length = (short)0;
switch (alg)
{
case OtpAlgorithmEnum.Md5:
length = (short)16;
break;
case OtpAlgorithmEnum.Sha1:
length = (short)20;
break;
case OtpAlgorithmEnum.Des:
length = (short)8;
break;
}
switch (valueType)
{
case OtpValueTypeEnum.Raw:
break;
case OtpValueTypeEnum.HexaDecimal:
length *= (short)2;
break;
case OtpValueTypeEnum.Numerical:
length *= (short)3;
break;
}
return(length);
}
public static byte[] Signe(string appKey, string userKey, string data, OtpAlgorithmEnum AuthAlgorithm)
{
byte[] uKey = Encoding.UTF8.GetBytes(userKey);
byte[] aKey = Encoding.UTF8.GetBytes(appKey);
byte[] chall = Encoding.UTF8.GetBytes(data);
byte[] inBuf = new byte[aKey.Length + uKey.Length + chall.Length];
int j = 0;
for (int i = 0; i < uKey.Length; i++)
{
inBuf[j++] = uKey[i];
}
for (int i = 0; i < aKey.Length; i++)
{
inBuf[j++] = aKey[i];
}
for (int i = 0; i < chall.Length; i++)
{
inBuf[j++] = chall[i];
}
byte[] hashedvalue = null;
switch (AuthAlgorithm)
{
case OtpAlgorithmEnum.Md5:
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
hashedvalue = md5.ComputeHash(inBuf);
break;
case OtpAlgorithmEnum.Sha1:
System.Security.Cryptography.SHA1 sha1 = System.Security.Cryptography.SHA1.Create();
hashedvalue = sha1.ComputeHash(inBuf);
break;
case OtpAlgorithmEnum.Des:
break;
}
return(hashedvalue);
}
public static byte[] GenerateOtp(string appKey, string userKey, string challenge, OtpAlgorithmEnum AuthAlgorithm)
{
byte[] uKey = Encoding.UTF8.GetBytes(userKey);
byte[] aKey = Encoding.UTF8.GetBytes(appKey);
byte[] chall = Encoding.UTF8.GetBytes(challenge);
byte[] inBuf = new byte[uKey.Length + aKey.Length + chall.Length];
int j = 0;
for (int i = 0; i < uKey.Length; i++)
{
inBuf[j++] = uKey[i];
}
for (int i = 0; i < aKey.Length; i++)
{
inBuf[j++] = aKey[i];
}
for (int i = 0; i < chall.Length; i++)
{
inBuf[j++] = chall[i];
}
byte[] hashedvalue = null;
switch (AuthAlgorithm)
{
case OtpAlgorithmEnum.Md5:
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
hashedvalue = md5.ComputeHash(inBuf);
break;
case OtpAlgorithmEnum.Sha1:
System.Security.Cryptography.SHA1 sha1 = System.Security.Cryptography.SHA1.Create();
hashedvalue = sha1.ComputeHash(inBuf);
break;
case OtpAlgorithmEnum.Des:
int lenAdj = inBuf.Length % 8;
if (lenAdj != 0)
{
lenAdj = 8 - lenAdj;
}
//int byteLen =
byte[] temp = new byte[inBuf.Length + lenAdj];
Array.Copy(inBuf, temp, inBuf.Length);
for (int i = 0; i < lenAdj; i++)
{
temp[inBuf.Length + i] = 0x00;
}
hashedvalue = Encrypt3DES(new MemoryStream(temp), uKey, new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }).ToArray();
break;
}
return(hashedvalue);
}
