protected override bool CheckSecret(PasswdBase info)
{
CryExtInfo infos = info.ExtraInfo as CryExtInfo;
if (infos == null)
{
return(false);
}
using (HMACSHA512 hash512 = new HMACSHA512(infos.Key)) {
byte[] pwdDate = Encoding.UTF8.GetBytes(this.Password);
byte[] pwdWithSalt = new byte[pwdDate.Length + infos.Salt.Length];
Array.Copy(pwdDate, pwdWithSalt, pwdDate.Length);
Array.Copy(infos.Salt, 0, pwdWithSalt, pwdDate.Length, infos.Salt.Length);
byte[] pwdBuffer = hash512.ComputeHash(pwdWithSalt);
for (int i = 0; i <= infos.Count; i++)
{
pwdBuffer = hash512.ComputeHash(pwdBuffer);
}
return(this.SlowCompose(info.Password, pwdBuffer));
}
}
protected override PasswdBase Secret()
{
if (this.date.VersionHash == "")
{
throw new Exception("the VERSION is not set");
}
using (HMACSHA512 hash512 = new HMACSHA512()) {
using (RNGCryptoServiceProvider rnd = new RNGCryptoServiceProvider()) {
Random cntRnd = new Random();
CryExtInfo extra = new CryExtInfo();
extra.Count = cntRnd.Next(this.MinCount, this.MaxCount);
extra.Salt = new byte[64];
//fill the Randomize salt ,the Salt's length is
//512bit
rnd.GetNonZeroBytes(extra.Salt);
using (SHA512CryptoServiceProvider sha512 = new SHA512CryptoServiceProvider()) {
byte[] KeyBuffer = new byte[64];
rnd.GetNonZeroBytes(KeyBuffer);
KeyBuffer = sha512.ComputeHash(KeyBuffer);
extra.Key = KeyBuffer;
hash512.Key = KeyBuffer;
this.date.ExtraInfo = extra;
byte[] pwdBuffer;
byte[] pwdDate = Encoding.UTF8.GetBytes(this.Password);
//now we add the salt to the string
byte[] pwdWithSalt = new byte[pwdDate.Length + extra.Salt.Length];
Array.Copy(pwdDate, pwdWithSalt, pwdDate.Length);
Array.Copy(extra.Salt, 0, pwdWithSalt, pwdDate.Length, extra.Salt.Length);
pwdBuffer = hash512.ComputeHash(pwdWithSalt);
for (int i = 0; i <= extra.Count; i++)
{
pwdBuffer = hash512.ComputeHash(pwdBuffer);
}
this.date.Password = pwdBuffer;
}
}
}
return(this.date);
}
protected override PasswdBase Secret()
{
if (this.date.VersionHash == "")
throw new Exception ("the VERSION is not set");
using (HMACSHA512 hash512 = new HMACSHA512()) {
using (RNGCryptoServiceProvider rnd = new RNGCryptoServiceProvider()) {
Random cntRnd = new Random ();
CryExtInfo extra = new CryExtInfo ();
extra.Count = cntRnd.Next (this.MinCount, this.MaxCount);
extra.Salt = new byte[64];
//fill the Randomize salt ,the Salt's length is
//512bit
rnd.GetNonZeroBytes (extra.Salt);
using (SHA512CryptoServiceProvider sha512 = new SHA512CryptoServiceProvider()) {
byte[] KeyBuffer = new byte[64];
rnd.GetNonZeroBytes (KeyBuffer);
KeyBuffer = sha512.ComputeHash (KeyBuffer);
extra.Key = KeyBuffer;
hash512.Key = KeyBuffer;
this.date.ExtraInfo = extra;
byte[] pwdBuffer;
byte[] pwdDate = Encoding.UTF8.GetBytes (this.Password);
//now we add the salt to the string
byte[] pwdWithSalt = new byte[pwdDate.Length + extra.Salt.Length];
Array.Copy (pwdDate, pwdWithSalt, pwdDate.Length);
Array.Copy (extra.Salt, 0, pwdWithSalt, pwdDate.Length, extra.Salt.Length);
pwdBuffer = hash512.ComputeHash (pwdWithSalt);
for (int i=0; i<= extra.Count; i++) {
pwdBuffer = hash512.ComputeHash (pwdBuffer);
}
this.date.Password = pwdBuffer;
}
}
}
return this.date;
}
