public string GenerateRandomPassword()
{
var passwordBytes = this._platform.GenerateRandomBytes(32);
char[] passwordChars = Base64Encoder.EncodeDataToBase64CharArray(passwordBytes);
string passwordString = new string(passwordChars).Remove(43).Replace("/", "$");
var sb = new StringBuilder();
for (var i = 0; i != passwordString.Length; ++i)
{
sb.Append(passwordString[i]);
var insertSpace = (i + 1) % 5 == 0;
var insertNewLine = (i + 1) % 25 == 0;
if (insertNewLine)
{
sb.Append(Environment.NewLine);
}
else if (insertSpace)
{
sb.Append(" ");
}
}
return(sb.ToString());
}
public static CipherV2 DissectVisualCryptText(string visualCryptText, LongRunningOperationContext context)
{
try
{
var visualCrypt = WhiteListVisualCryptCharacters(visualCryptText, context);
if (!visualCrypt.StartsWith(VisualCryptSlashText, StringComparison.OrdinalIgnoreCase))
{
throw CommonFormatException("The prefix '{0}' is missing.".FormatInvariant(VisualCryptSlashText));
}
var visualCryptTextV2Base64 = visualCrypt.Remove(0, VisualCryptSlashText.Length).Replace('$', '/');
var visualCryptTextV2Bytes = Base64Encoder.DecodeBase64StringToBinary(visualCryptTextV2Base64);
return(DissectBytesToCipherV2(visualCryptTextV2Bytes));
}
catch (Exception e)
{
if (e.Message.StartsWith(LocalizableStrings.MsgFormatError))
{
throw;
}
throw CommonFormatException(e.Message);
}
}
public static VisualCryptText CreateVisualCryptText(byte[] cipherV2, int length, int breakAfter = 74)
{
Guard.NotNull(cipherV2);
int maxBytesNeeded;
if (length == -1)
{
length = Base64Encoder.CalculateBase64EncodedLengthInChars(cipherV2.Length);
maxBytesNeeded = cipherV2.Length;
}
else
{
maxBytesNeeded = Base64Encoder.SafeEstimateBytesNeededForNBase64Chars(length);
}
char[] charsToProduce = new char[length + 4]; // safety margin
Convert.ToBase64CharArray(cipherV2, 0, Math.Min(cipherV2.Length, maxBytesNeeded), charsToProduce, 0);
var sb = new StringBuilder();
var ellipsis = " ...";
length = length - ellipsis.Length;
var charsInLine = 0;
var charactersProcessed = 0;
foreach (var c in VisualCryptSlashText)
{
sb.Append(c);
if (++charsInLine != breakAfter)
{
continue;
}
sb.Append(new[] { '\r', '\n' });
charsInLine = 0;
}
foreach (var c in charsToProduce)
{
if (length == charactersProcessed++)
{
sb.Append(ellipsis);
break;
}
sb.Append(c == '/' ? '$' : c);
if (++charsInLine != breakAfter)
{
continue;
}
sb.Append(new[] { '\r', '\n' });
charsInLine = 0;
}
return(new VisualCryptText(sb.ToString()));
}
public static VisualCryptText CreateVisualCryptText(CipherV2 cipherV2)
{
Guard.NotNull(cipherV2);
var visualCryptTextV2Bytes = ByteArrays.Concatenate(
// len Sum(len) Start Index
new[] { CipherV2.Version }, // 1 1 0
new[] { cipherV2.RoundsExponent.Value }, // 1 2 1
new[] { cipherV2.PlaintextPadding.Value }, // 1 3 2
cipherV2.IV16.GetBytes(), // 16 19 3
cipherV2.MACCipher16.GetBytes(), // 16 35 19
cipherV2.RandomKeyCipher32.GetBytes(), // 32 67 35
cipherV2.MessageCipher.GetBytes() // len 67 + len 67
);
if (visualCryptTextV2Bytes.Length < HeaderLenght)
{
throw new Exception("Data cannot be shorter than the required header.");
}
var visualCryptTextV2Base64 = Base64Encoder.EncodeDataToBase64CharArray(visualCryptTextV2Bytes);
var sb = new StringBuilder();
const int breakAfter = 74;
var charsInLine = 0;
foreach (var c in VisualCryptSlashText)
{
sb.Append(c);
if (++charsInLine != breakAfter)
{
continue;
}
sb.Append(new[] { '\r', '\n' });
charsInLine = 0;
}
foreach (var c in visualCryptTextV2Base64)
{
sb.Append(c == '/' ? '$' : c);
if (++charsInLine != breakAfter)
{
continue;
}
sb.Append(new[] { '\r', '\n' });
charsInLine = 0;
}
return(new VisualCryptText(sb.ToString()));
}