/// <summary>
/// Generates a random secure buffer of bytes
/// </summary>
public Security.SecureBuffer NextRandomSecureBuffer(int minLength, int maxLength)
{
if (minLength < 0)
{
minLength = 0;
}
var count = minLength;
if (maxLength > minLength)
{
count = this.NextScaledRandomInteger(minLength, maxLength);
}
var buffer = new Security.SecureBuffer(count);
var bytes = new byte[4];
for (var i = 0; i < count; i += 4)
{
bytes.WriteBEInt32(this.NextRandomInteger);
for (var j = 0; j < 4 && i + j < count; j++)
{
buffer.Push(bytes[j]);
bytes[j] = 0;
}
}
buffer.Seal();
return(buffer);
}
/// <summary>
/// Generates a random secure buffer of chars which are safe for the use on the web -
/// a string that only contains "a-z"/"A-Z" and "0-9" and "-"/"_" chars, i.e.: "bo7O0EFasZe-wEty9w0__JiOKk81".
/// The length of the string can not be less than 4 and more than 1024 chars
/// </summary>
public Security.SecureBuffer NextRandomWebSafeSecureBuffer(int minLength = 16, int maxLength = 32)
{
const int MIN_LEN = 4;
const int MAX_LEN = 1024;
if (minLength < MIN_LEN)
{
minLength = MIN_LEN;
}
if (maxLength > MAX_LEN)
{
maxLength = MAX_LEN;
}
var count = minLength;
if (maxLength > minLength)
{
count += this.NextScaledRandomInteger(0, maxLength - minLength);
}
var result = new Security.SecureBuffer(count);
for (var i = 0; i < count; i++)
{
var b = (byte)CHAR_DICT[(this.NextRandomInteger & CoreConsts.ABS_HASH_MASK) % CHAR_DICT_LEN];
result.Push(b);
}
result.Seal();
return(result);
}