/// <summary>
/// Read the protected string and return it protected with a sequence
/// of bytes generated by a random stream.
/// </summary>
/// <param name="crsRandomSource">Random number source.</param>
/// <returns>Protected string.</returns>
public byte[] ReadXorredString(CryptoRandomStream crsRandomSource)
{
Debug.Assert(crsRandomSource != null); if (crsRandomSource == null)
{
throw new ArgumentNullException("crsRandomSource");
}
byte[] pbData = ReadUtf8();
uint uLen = (uint)pbData.Length;
byte[] randomPad = crsRandomSource.GetRandomBytes(uLen);
Debug.Assert(randomPad.Length == pbData.Length);
for (uint i = 0; i < uLen; ++i)
{
pbData[i] ^= randomPad[i];
}
return(pbData);
}
/// <summary>
/// Get the data xorred with bytes from a <c>CryptoRandomStream</c>.
/// </summary>
public byte[] ReadXorredData(CryptoRandomStream crsRandomSource)
{
if (crsRandomSource == null)
{
Debug.Assert(false); throw new ArgumentNullException("crsRandomSource");
}
byte[] pbData = ReadData();
int cb = pbData.Length;
byte[] pbPad = crsRandomSource.GetRandomBytes((uint)cb);
Debug.Assert(pbPad.Length == cb);
for (int i = 0; i < cb; ++i)
{
pbData[i] ^= pbPad[i];
}
MemUtil.ZeroByteArray(pbPad);
return(pbData);
}
public override ProtectedString Generate(PwProfile prf, CryptoRandomStream crsRandomSource)
{
PwProfile p = InitProfile(prf);
string sPattern = MapCharsets2Pattern(prf);
p.Pattern = sPattern;
int iLength = p.Pattern.Length;
//Add additionaly specified characters if any
//Increase overall length of generated password by 1: 1 per set = at least 1 out of the additinaly specified characters
string sAdditionalChars = GetAdditionalChars(prf);
if (AddAdditionalChars(p, sAdditionalChars))
{
iLength++;
}
//Calculate remaining length
iLength = (int)p.Length - iLength;
bool bSuccess;
FinalizePattern(p, sPattern, sAdditionalChars, iLength, out bSuccess);
if (!bSuccess)
{
return(ProtectedString.Empty);
}
ProtectedString ps = ProtectedString.Empty;
if (PwGenerator.Generate(out ps, p, crsRandomSource.GetRandomBytes(32), null) == PwgError.Success)
{
return(ps);
}
return(ProtectedString.Empty);
}
