NOTE: I have already solved the problem mentioned in this post. After doing lot of google I couldn't find right solution. As now I know the answer. I thought this post will save other developer's time trying to solve same.
Problem:
I wanted to Generate Cryptographic random string and send that as part of url to user. With Base64 string you will likely get Error:
The request filtering module is configured to deny a request that contains a double escape sequence
or it will not find your Route.
So either you hack/workaround and find/replace escape chars on Base64 String or use this solution.
This is how my original code look like.
public string GenerateRandomString()
{
var randomBytes = GenerateRandomBytes(512);
var randomString = Convert.ToBase64String(randomBytes);
return randomString;
}
private byte[] GenerateRandomBytes(int keyBitLength)
{
using (var provider = new RNGCryptoServiceProvider())
{
var lengthInByte = keyBitLength / 8;
var randomNumber = new byte[lengthInByte];
provider.GetBytes(randomNumber);
return randomNumber;
}
}
Solution is UrlTokenEncode. Added new method to convert random bytes to Url Encoded Token.
public string GenerateRandomStringToken()
{
var randomBytes = GenerateRandomBytes(512);
return HttpServerUtility.UrlTokenEncode(randomBytes);
}
private byte[] GenerateRandomBytes(int keyBitLength)
{
using (var provider = new RNGCryptoServiceProvider())
{
var lengthInByte = keyBitLength / 8;
var randomNumber = new byte[lengthInByte];
provider.GetBytes(randomNumber);
return randomNumber;
}
}
