Question

In C#,I’m using Blowfish.NET 2.1.3’s BlowfishECB.cs file(can be found here)

In C++,It’s unknown,but it is similiar.

In C++,the Initialize(blowfish) procedure is the following:

void cBlowFish::Initialize(BYTE key[], int keybytes) 

In C#,the Initialize(blowfish) procedure is the same

public void Initialize(byte[] key, int ofs, int len)  

This is the problem:

This is how the key is initialized in C++

DWORD keyArray[2] = {0}; //declaration ...some code blowfish.Initialize((LPBYTE)keyArray, 8); 

As you see,the key is an array of two DWORDS,which is 8 bytes total.

In C# I declare it like that,but I get an error

BlowfishECB blowfish = new BlowfishECB(); UInt32[] keyarray = new UInt32[2]; ..some code blowfish.Initialize(keyarray, 0, 8); 

The error is:

Argument ‘1’: cannot convert from ‘uint[]’ to ‘byte[]’

What am I doing wrong?

Thanks in advance!

Answer 1

You can use BitConverter to get the bytes from a UInt32.

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To do this, you’ll need to convert each element in a loop. I would do something like:

 private byte[] ConvertFromUInt32Array(UInt32[] array) {     List<byte> results = new List<byte>();     foreach(UInt32 value in array)     {         byte[] converted = BitConverter.GetBytes(value);         results.AddRange(converted);     }     return results.ToArray(); } 

To go back:

 private UInt32[] ConvertFromByteArray(byte[] array) {     List<UInt32> results = new List<UInt32>();     for(int i=0;i<array.Length;i += 4)     {         byte[] temp = new byte[4];         for (int j=0;j<4;++j)             temp[j] = array[i+j];         results.Add(BitConverter.ToUInt32(temp);     }     return results.ToArray(); }