Anyone knows WinRT API for Cryptographically strong Pseudo random number?

Question

Hi,

What is counterpart of BCryptGenRandom()/CryptGenRandom() in WinRT C++?

Thanks,

Answer 1

hello, Jones:

is this what you're looking for?

            UInt32 Rnd = CryptographicBuffer.GenerateRandomNumber();

I'm not familiar with crypto, so just for your referrence.

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---------------------------------------------- JohnYe from SHANGHAI. email: [e-mail]

Answer 2

Please refer to CryptographicBuffer.GenerateRandom method.

Here is sample code.

using Windows.Security.Cryptography;

public String GenerateRndData()
{
	// Define the length, in bytes, of the buffer.
	UInt32 length = 32;

	// Generate random data and copy it to a buffer.
	IBuffer buffer = CryptographicBuffer.GenerateRandom(length);

	// Encode the buffer to a hexadecimal string (for display).
	String hexRnd = CryptographicBuffer.EncodeToHexString(buffer);

	return hexRnd;
}

public UInt32 GenerateRndNumber()
{
	// Generate a random number.
	UInt32 Rnd = CryptographicBuffer.GenerateRandomNumber();

	return Rnd;
}

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Best wishes,

---

Robin [MSFT]
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Answer 3

How to get actual bytes out of Ibuffer  ?

Answer 4

You can load it into a DataReader: DataReader.FromBuffer
If you want the raw bytes you can query for its IBufferByteAccess interface

--Rob