Export to flash, No error but different results

The codes below is a simple MD5 class, it just works fine in non-flash version, it can be exported to flash, but md5 result is different from other version.

public class CustomMD5
{

//static state variables

private static UInt32 A;

private static UInt32 B;

private static UInt32 C;

private static UInt32 D;



//number of bits to rotate in tranforming

private const int S11 = 7;

private const int S12 = 12;

private const int S13 = 17;

private const int S14 = 22;

private const int S21 = 5;

private const int S22 = 9;

private const int S23 = 14;

private const int S24 = 20;

private const int S31 = 4;

private const int S32 = 11;

private const int S33 = 16;

private const int S34 = 23;

private const int S41 = 6;

private const int S42 = 10;

private const int S43 = 15;

private const int S44 = 21;





/* F, G, H and I are basic MD5 functions.

*

* F(X,Y,Z) =(X&Y)|((~X)&Z)

* G(X,Y,Z) =(X&Z)|(Y(~Z))

* H(X,Y,Z) =X^Y^Z

* I(X,Y,Z)=Y^(X|(~Z))

*

*/

private static UInt32 F(UInt32 x, UInt32 y, UInt32 z)
{

return (x y) | ((~x) z);

}

private static UInt32 G(UInt32 x, UInt32 y, UInt32 z)
{

return (x z) | (y (~z));

}

private static UInt32 H(UInt32 x, UInt32 y, UInt32 z)
{

return x ^ y ^ z;

}

private static UInt32 I(UInt32 x, UInt32 y, UInt32 z)
{

return y ^ (x | (~z));

}



/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.

* Rotation is separate from addition to prevent recomputation.

*/

private static void FF(ref UInt32 a, UInt32 b, UInt32 c, UInt32 d, UInt32 mj, int s, UInt32 ti)
{

a = a + F(b, c, d) + mj + ti;

a = a << s | a >> (32 - s);

a += b;

}

private static void GG(ref UInt32 a, UInt32 b, UInt32 c, UInt32 d, UInt32 mj, int s, UInt32 ti)
{

a = a + G(b, c, d) + mj + ti;

a = a << s | a >> (32 - s);

a += b;

}

private static void HH(ref UInt32 a, UInt32 b, UInt32 c, UInt32 d, UInt32 mj, int s, UInt32 ti)
{

a = a + H(b, c, d) + mj + ti;

a = a << s | a >> (32 - s);

a += b;

}

private static void II(ref UInt32 a, UInt32 b, UInt32 c, UInt32 d, UInt32 mj, int s, UInt32 ti)
{

a = a + I(b, c, d) + mj + ti;

a = a << s | a >> (32 - s);

a += b;

}



private static void MD5_Init()
{

A = 0x67452301; //in memory, this is 0x01234567

B = 0xefcdab89; //in memory, this is 0x89abcdef

C = 0x98badcfe; //in memory, this is 0xfedcba98

D = 0x10325476; //in memory, this is 0x76543210

}



private static UInt32[] MD5_Append(byte[] input)
{

int zeros = 0;

int ones = 1;

int size = 0;

int n = input.Length;

int m = n % 64;

if (m < 56)
{

zeros = 55 - m;

size = n - m + 64;

}

else if (m == 56)
{

zeros = 0;

ones = 0;

size = n + 8;

}

else
{

zeros = 63 - m + 56;

size = n + 64 - m + 64;

}



ArrayList bs = new ArrayList(input);

if (ones == 1)
{

bs.Add((byte)0x80); // 0x80 = $10000000

}

for (int i = 0; i < zeros; i++)
{

bs.Add((byte)0);

}



UInt64 N = (UInt64)n * 8;

byte h1 = (byte)(N 0xFF);

byte h2 = (byte)((N >> 8) 0xFF);

byte h3 = (byte)((N >> 16) 0xFF);

byte h4 = (byte)((N >> 24) 0xFF);

byte h5 = (byte)((N >> 32) 0xFF);

byte h6 = (byte)((N >> 40) 0xFF);

byte h7 = (byte)((N >> 48) 0xFF);

byte h8 = (byte)(N >> 56);

bs.Add(h1);

bs.Add(h2);

bs.Add(h3);

bs.Add(h4);

bs.Add(h5);

bs.Add(h6);

bs.Add(h7);

bs.Add(h8);

//** Not support by Flash**/
//byte[] ts = (byte[])bs.ToArray(typeof(byte));
byte[] ts = ArrayToBytes(bs);


/* Decodes input (byte[]) into output (UInt32[]). Assumes len is

* a multiple of 4.

*/

UInt32[] output = new UInt32[size / 4];

for (Int64 i = 0, j = 0; i < size; j++, i += 4)
{

output[j] = (UInt32)(ts | ts[i + 1] << 8 | ts[i + 2] << 16 | ts[i + 3] << 24);

}

return output;

}

protected static byte[] ArrayToBytes(ArrayList array)
{
byte[] bytes = new byte[array.Count];
for (int i = 0; i < array.Count; i++)
{
bytes = (byte)array;
}

return bytes;
}

private static UInt32[] MD5_Trasform(UInt32[] x)
{



UInt32 a, b, c, d;



for (int k = 0; k < x.Length; k += 16)
{

a = A;

b = B;

c = C;

d = D;



/* Round 1 */

FF(ref a, b, c, d, x[k + 0], S11, 0xd76aa478); /* 1 */

FF(ref d, a, b, c, x[k + 1], S12, 0xe8c7b756); /* 2 */

FF(ref c, d, a, b, x[k + 2], S13, 0x242070db); /* 3 */

FF(ref b, c, d, a, x[k + 3], S14, 0xc1bdceee); /* 4 */

FF(ref a, b, c, d, x[k + 4], S11, 0xf57c0faf); /* 5 */

FF(ref d, a, b, c, x[k + 5], S12, 0x4787c62a); /* 6 */

FF(ref c, d, a, b, x[k + 6], S13, 0xa8304613); /* 7 */

FF(ref b, c, d, a, x[k + 7], S14, 0xfd469501); /* 8 */

FF(ref a, b, c, d, x[k + 8], S11, 0x698098d8); /* 9 */

FF(ref d, a, b, c, x[k + 9], S12, 0x8b44f7af); /* 10 */

FF(ref c, d, a, b, x[k + 10], S13, 0xffff5bb1); /* 11 */

FF(ref b, c, d, a, x[k + 11], S14, 0x895cd7be); /* 12 */

FF(ref a, b, c, d, x[k + 12], S11, 0x6b901122); /* 13 */

FF(ref d, a, b, c, x[k + 13], S12, 0xfd987193); /* 14 */

FF(ref c, d, a, b, x[k + 14], S13, 0xa679438e); /* 15 */

FF(ref b, c, d, a, x[k + 15], S14, 0x49b40821); /* 16 */



/* Round 2 */

GG(ref a, b, c, d, x[k + 1], S21, 0xf61e2562); /* 17 */

GG(ref d, a, b, c, x[k + 6], S22, 0xc040b340); /* 18 */

GG(ref c, d, a, b, x[k + 11], S23, 0x265e5a51); /* 19 */

GG(ref b, c, d, a, x[k + 0], S24, 0xe9b6c7aa); /* 20 */

GG(ref a, b, c, d, x[k + 5], S21, 0xd62f105d); /* 21 */

GG(ref d, a, b, c, x[k + 10], S22, 0x2441453); /* 22 */

GG(ref c, d, a, b, x[k + 15], S23, 0xd8a1e681); /* 23 */

GG(ref b, c, d, a, x[k + 4], S24, 0xe7d3fbc8); /* 24 */

GG(ref a, b, c, d, x[k + 9], S21, 0x21e1cde6); /* 25 */

GG(ref d, a, b, c, x[k + 14], S22, 0xc33707d6); /* 26 */

GG(ref c, d, a, b, x[k + 3], S23, 0xf4d50d87); /* 27 */

GG(ref b, c, d, a, x[k + 8], S24, 0x455a14ed); /* 28 */

GG(ref a, b, c, d, x[k + 13], S21, 0xa9e3e905); /* 29 */

GG(ref d, a, b, c, x[k + 2], S22, 0xfcefa3f8); /* 30 */

GG(ref c, d, a, b, x[k + 7], S23, 0x676f02d9); /* 31 */

GG(ref b, c, d, a, x[k + 12], S24, 0x8d2a4c8a); /* 32 */



/* Round 3 */

HH(ref a, b, c, d, x[k + 5], S31, 0xfffa3942); /* 33 */

HH(ref d, a, b, c, x[k + 8], S32, 0x8771f681); /* 34 */

HH(ref c, d, a, b, x[k + 11], S33, 0x6d9d6122); /* 35 */

HH(ref b, c, d, a, x[k + 14], S34, 0xfde5380c); /* 36 */

HH(ref a, b, c, d, x[k + 1], S31, 0xa4beea44); /* 37 */

HH(ref d, a, b, c, x[k + 4], S32, 0x4bdecfa9); /* 38 */

HH(ref c, d, a, b, x[k + 7], S33, 0xf6bb4b60); /* 39 */

HH(ref b, c, d, a, x[k + 10], S34, 0xbebfbc70); /* 40 */

HH(ref a, b, c, d, x[k + 13], S31, 0x289b7ec6); /* 41 */

HH(ref d, a, b, c, x[k + 0], S32, 0xeaa127fa); /* 42 */

HH(ref c, d, a, b, x[k + 3], S33, 0xd4ef3085); /* 43 */

HH(ref b, c, d, a, x[k + 6], S34, 0x4881d05); /* 44 */

HH(ref a, b, c, d, x[k + 9], S31, 0xd9d4d039); /* 45 */

HH(ref d, a, b, c, x[k + 12], S32, 0xe6db99e5); /* 46 */

HH(ref c, d, a, b, x[k + 15], S33, 0x1fa27cf8); /* 47 */

HH(ref b, c, d, a, x[k + 2], S34, 0xc4ac5665); /* 48 */



/* Round 4 */

II(ref a, b, c, d, x[k + 0], S41, 0xf4292244); /* 49 */

II(ref d, a, b, c, x[k + 7], S42, 0x432aff97); /* 50 */

II(ref c, d, a, b, x[k + 14], S43, 0xab9423a7); /* 51 */

II(ref b, c, d, a, x[k + 5], S44, 0xfc93a039); /* 52 */

II(ref a, b, c, d, x[k + 12], S41, 0x655b59c3); /* 53 */

II(ref d, a, b, c, x[k + 3], S42, 0x8f0ccc92); /* 54 */

II(ref c, d, a, b, x[k + 10], S43, 0xffeff47d); /* 55 */

II(ref b, c, d, a, x[k + 1], S44, 0x85845dd1); /* 56 */

II(ref a, b, c, d, x[k + 8], S41, 0x6fa87e4f); /* 57 */

II(ref d, a, b, c, x[k + 15], S42, 0xfe2ce6e0); /* 58 */

II(ref c, d, a, b, x[k + 6], S43, 0xa3014314); /* 59 */

II(ref b, c, d, a, x[k + 13], S44, 0x4e0811a1); /* 60 */

II(ref a, b, c, d, x[k + 4], S41, 0xf7537e82); /* 61 */

II(ref d, a, b, c, x[k + 11], S42, 0xbd3af235); /* 62 */

II(ref c, d, a, b, x[k + 2], S43, 0x2ad7d2bb); /* 63 */

II(ref b, c, d, a, x[k + 9], S44, 0xeb86d391); /* 64 */



A += a;

B += b;

C += c;

D += d;

}

return new UInt32[] { A, B, C, D };

}

public static byte[] MD5Array(byte[] input)
{

MD5_Init();

UInt32[] block = MD5_Append(input);

UInt32[] bits = MD5_Trasform(block);



/* Encodes bits (UInt32[]) into output (byte[]). Assumes len is

* a multiple of 4.

*/

byte[] output = new byte[bits.Length * 4];

for (int i = 0, j = 0; i < bits.Length; i++, j += 4)
{

output[j] = (byte)(bits 0xff);

output[j + 1] = (byte)((bits >> 8) 0xff);

output[j + 2] = (byte)((bits >> 16) 0xff);

output[j + 3] = (byte)((bits >> 24) 0xff);

}

return output;

}



public static string ArrayToHexString(byte[] array, bool uppercase)
{

string hexString = "";

string format = "x2";

if (uppercase)
{

format = "X2";

}

foreach (byte b in array)
{

hexString += b.ToString(format);

}

return hexString;

}



public static string MDString(string message)
{

char[] c = message.ToCharArray();

byte[] b = new byte[c.Length];

for (int i = 0; i < c.Length; i++)
{

b = (byte)c;

}

byte[] digest = MD5Array(b);

return ArrayToHexString(digest, false);

}

/*
public static string MDFile(string fileName)
{

FileStream fs = File.Open(fileName, FileMode.Open, FileAccess.Read);

byte[] array = new byte[fs.Length];

fs.Read(array, 0, (int)fs.Length);

byte[] digest = MD5Array(array);

fs.Close();

return ArrayToHexString(digest, false);

}
*/
}

 

Before further analyzing your code, I'd suggest checking the following thread: MD5 functions in the flash export. There's a professional-grade solution to get MD5 work in Flash, *cough*.

 

Convert.ToChar will convert a byte to a single char in Unity, but in flash, this function will convert a byte to a number based string.

 

Cast the char to string (or use char.ToString()).

The reason is that flash has no "char" type and we represent it in actionscript as an int; since actually introducing a char type would amount to excessive overhead, the workaround above is (a one liner) is the solution.