public String getOtpNum(String extraInfo, long?systemCurrentTimeMillis = null)
{
log("getOtpNum extraInfo" + extraInfo);
String tid4Location = getTid4Location();
if (string.IsNullOrEmpty(tid4Location))
{
log("getOtpNum tid is null");
//logGetOtp(null, null, str);
return(null);
}
string encryptedSeed;
String settingInfo;
byte[] OtpNumseed;
//String key = OtpShareStore.SETTING_INFOS_NEW;
String lastSeed = OtpShareStore.getString(this.applicationContex, tid4Location, OtpShareStore.SETTING_INFOS_NEW);
log("获取本地加密的种子1 encryptedSeed =" + lastSeed);
if (string.IsNullOrEmpty(lastSeed))
{
//key = OtpShareStore.SETTING_INFOS;
encryptedSeed = OtpShareStore.getString(this.applicationContex, tid4Location, OtpShareStore.SETTING_INFOS);
settingInfo = OtpShareStore.SETTING_INFOS;
}
else
{
encryptedSeed = lastSeed;
settingInfo = OtpShareStore.SETTING_INFOS_NEW;
}
log("获取本地加密的种子2 encryptedSeed =" + encryptedSeed + " settingInfo=" + settingInfo);
if (encryptedSeed == null || "" == encryptedSeed)
{
log("getOtpNum encryptedSeed is null");
OtpNumseed = null;
}
else
{
lastSeed = tid4Location.GetJavaHashCode().ToString();
if (settingInfo == (OtpShareStore.SETTING_INFOS))
{
lastSeed = Guid.NewGuid().ToString();
//lastSeed = DeviceInfo.getInstance().getImei();
}
byte[] decryptOtpSeed = OtpSeedCryptor.decryptOtpSeed(encryptedSeed, lastSeed);
if (decryptOtpSeed == null)
{
log("机密种子seed is null");
deleteSeed();
OtpNumseed = decryptOtpSeed;
}
else
{
OtpNumseed = decryptOtpSeed;
}
}
if (OtpNumseed == null)
{
log("getOtpNum seed is null");
//logGetOtp(null, null, str);
return(null);
}
byte[] bArr;
if (String.IsNullOrEmpty(extraInfo))
{
bArr = OtpNumseed;
}
else
{
log("init seed: " + bytesToHexString(OtpNumseed));
log("extraInfo : " + extraInfo);
byte[] a = sha1(extraInfo);
bArr = new byte[(a.Length + OtpNumseed.Length)];
Array.Copy(OtpNumseed, 0, bArr, 0, OtpNumseed.Length);
Array.Copy(a, 0, bArr, OtpNumseed.Length, a.Length);
log("extraBytes : " + bytesToHexString(a));
log("final seed :" + bytesToHexString(bArr));
}
try
{
var timeDiff = getServerTimeDiff();
string intervalStr = OtpShareStore.getString(this.applicationContex, "interval", settingInfo);
long interval = !string.IsNullOrEmpty(intervalStr) ? long.Parse(intervalStr) : 30;
var currentTimeMillis =
systemCurrentTimeMillis.HasValue?
systemCurrentTimeMillis.Value:
(long)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalMilliseconds;
long unixTimestamp = !string.IsNullOrEmpty(timeDiff) ? (currentTimeMillis / 1000) + long.Parse(timeDiff) : currentTimeMillis / 1000;
if (settingInfo == (OtpShareStore.SETTING_INFOS))
{
try
{
lastSeed = OtpShareStore.getString(this.applicationContex, getUserId() + "+" + tid4Location, settingInfo);
OtpShareStore.putString(this.applicationContex, "interval", interval.ToString(), OtpShareStore.SETTING_INFOS_NEW);
OtpShareStore.putString(this.applicationContex, getUserId() + "+" + tid4Location, lastSeed, OtpShareStore.SETTING_INFOS_NEW);
OtpShareStore.putString(this.applicationContex, "timedeff", timeDiff, OtpShareStore.SETTING_INFOS_NEW);
lastSeed = bytesToHexString(bArr);
log(" strOtpSeedHex=" + lastSeed);
lastSeed = OtpSeedCryptor.encryptOtpSeed(lastSeed, tid4Location.GetJavaHashCode().ToString());
log(" decodeSeed=" + lastSeed);
OtpShareStore.putString(this.applicationContex, tid4Location, lastSeed, OtpShareStore.SETTING_INFOS_NEW);
}
catch (Exception e)
{
}
}
return(Hotp.Compute(bArr, unixTimestamp / interval, 6));
}
catch (Exception e)
{
return(null);
}
}
private byte[] sha1(string str)
{
return(OtpSeedCryptor.Sha1(str));
}