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Password Safe Reader for Windows Mobile

, , , , 20 Mar 2010 GPL3
A Windows Mobile C# reader for the popular Password Safe archive files.
/*
 * ---------------------------------------------------------
 * NetSHA.SHA256 .Net Framework implementation of SHA-256
 * 
 * by Jarrod Nelson for ECE 575 Project  
 * --------------------------------------------------------- 
 * Comments:
 * This class contains static methods which
 * implement SHA-256 either on a given file or on
 * a message stored in a byte array.
 * ---------------------------------------------------------
 * 
 */
// http://islab.oregonstate.edu/koc/ece575/04Project/Nelson/NetSHA.htm

using System;

namespace Helpers.PasswordSafe
{
	/// <summary>
	/// SHA-256 implementation
	/// </summary>
	public sealed class SHA256Class
	{
		//SHA-256 constants
		private const uint _H00 = 0x6a09e667;
		private const uint _H10 = 0xbb67ae85;
		private const uint _H20 = 0x3c6ef372;
		private const uint _H30 = 0xa54ff53a;
		private const uint _H40 = 0x510e527f;
		private const uint _H50 = 0x9b05688c;
		private const uint _H60 = 0x1f83d9ab;
		private const uint _H70 = 0x5be0cd19;

		/// <summary>
		/// This method take a byte array, pads it according to the 
		/// specifications in FIPS 180-2 and passes to the SHA-256
		/// hash function. It returns a byte array containing 
		/// the hash of the given message.
		/// </summary>
		/// <param name="message">Message to be hashed as byte array</param>
		/// <returns>Message hash value as byte array</returns>
		public static byte[] MessageSHA256( byte[] message )
		{
			int n, pBase;
			long l;
			byte[] m;
			byte[] pad;
			byte[] swap;
			byte[] temp;

			// Determine length of message in 512-bit blocks
			n = (int)(message.Length >> 6);

			// Determine space required for padding
			if( (message.Length & 0x3f) < 56 )
			{			
				n++;
				pBase = 56;
			}
			else
			{
				n+=2;
				pBase = 120;
			}

			// Determine total message length
			l = message.Length << 3;

			// Create message padding 
			pad = new byte[pBase-(message.Length & 0x3f)];
			pad[0] = 0x80;
			for( int i = 1; i < pad.Length; i++ )
				pad[i] = 0;
			m = new byte[n*64];

			// Assemble padded message
			Array.Copy( message, 0, m, 0, message.Length );
			Array.Copy( pad, 0, m, message.Length, pad.Length );
			temp = BitConverter.GetBytes( (long)l );
			swap = new byte[8];
			for( int i = 0; i < 8; i++ )
				swap[i] = temp[7-i];
			Array.Copy( swap, 0, m, message.Length+pad.Length, 8 );

			// Call Hash1 to hash message
			return Hash256( n, m );
		}

		/*
		/// <summary>
		/// This methods takes the name of a file containing
		/// a message to be hashed.  It loads the message and 
		/// calls MessageSHA256 to pad and hash the message.  This
		/// method returns a byte array containing the hash value
		/// for the given file.
		/// </summary>
		/// <param name="fileName">
		/// Name of file containing message to be hashed.
		/// </param>
		/// <returns>Message hash value as byte array</returns>
		public static byte[] FileSHA256( string fileName )
		{
			byte[] m;

			// Open File and read in message
			FileStream messageFile = new FileStream( fileName, 
				FileMode.Open, FileAccess.Read );

			// Check length of file to ensure it is within
			// currently supported range.
			if( Int32.MaxValue > messageFile.Length )
			{
				m = new byte[ (int)messageFile.Length-2 ];
				messageFile.Read( m, 0, (int)messageFile.Length-2 );
			}
			else
				throw new Exception( "File length exceeds current supported size!" );

			messageFile.Close();

			// Call MessageSHA1
			return MessageSHA256( m );
		}
		*/

		/// <summary>
		/// SHA-1 Hash function - This method should only be used
		/// with properly padded messages.  To hash an unpadded 
		/// message use one of the other methods.  This method is
		/// called by other methods once the message is padded
		/// and loaded as a byte array.  For internal use only!
		/// </summary>
		/// <param name="n">Number of 512-bit message segments</param>
		/// <param name="m">Message to be hashed as byte array</param>
		/// <returns>Hash value as byte array</returns>
		private static byte[] Hash256( int n, byte[] m )
		{
			// K Constants			
			uint[] K = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 
						   0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
						   0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
						   0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
						   0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
						   0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
						   0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
						   0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
						   0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
						   0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
						   0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
						   0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
						   0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
						   0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
						   0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
						   0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
			// Calculation variables
			uint a, b, c, d, e, f, g, h, temp1, temp2;
			// Intermediate hash values
			uint[] interHash = new uint[8];
			// Scheduled W values
			uint[] w = new uint[64];
			// Final hash byte array
			byte[] hash = new byte[32];
			// Used to correct for endian
			byte[] swap = new byte[4];
			byte[] swap2 = new byte[4];

			// Initial hash values
			interHash[0] = _H00;
			interHash[1] = _H10;
			interHash[2] = _H20;
			interHash[3] = _H30;
			interHash[4] = _H40;
			interHash[5] = _H50;
			interHash[6] = _H60;
			interHash[7] = _H70;

			// Perform hash operation
			for( int i = 0; i < n; i++ )
			{
				// Prepare the message schedule
				for( int t = 0; t < 64; t++ )
				{
					if( t < 16 )
					{	
						for( int j = 0; j < 4; j++ )
							swap[j] = m[i*64+t*4+3-j];
						w[t] = BitConverter.ToUInt32( swap, 0 );	
					}
					else
					{
						w[t] = (uint)( Sigma( 3, w[t-2] ) + w[t-7] 
							+ Sigma( 2, w[t-15] ) + w[t-16] );
						
					}
				}

				//Initialize the five working variables
				a = interHash[0];
				b = interHash[1];
				c = interHash[2];
				d = interHash[3];
				e = interHash[4];
				f = interHash[5];
				g = interHash[6];
				h = interHash[7];
				
				//Perform main hash loop
				for( int t = 0; t < 64; t++ )
				{
					
					temp1 = (uint)( h + Sigma( 1, e ) + Func(true, e, f, g) 
						+ K[t] + w[t] );
					temp2 = (uint)( Sigma( 0, a ) + Func(false, a, b, c ) );
					h = g;
					g = f;
					f = e;
					e = (uint)( d + temp1 );
					d = c;
					c = b;
					b = a;
					a = (uint)( temp1 + temp2 );
				}

				//Compute the intermediate hash values
				interHash[0] = (uint)( (a + interHash[0]) );
				interHash[1] = (uint)( (b + interHash[1]) );
				interHash[2] = (uint)( (c + interHash[2]) );
				interHash[3] = (uint)( (d + interHash[3]) );
				interHash[4] = (uint)( (e + interHash[4]) );
				interHash[5] = (uint)( (f + interHash[5]) );
				interHash[6] = (uint)( (g + interHash[6]) );
				interHash[7] = (uint)( (h + interHash[7]) );
			}
	
			// Copy Intermediate results to final hash array
			for( int i = 0; i < 8; i++)
			{
				swap2 = BitConverter.GetBytes( (uint) interHash[i] );
				for( int j = 0; j < 4; j++ )
				{
					swap[j] = swap2[3-j];
				}
				Array.Copy( swap, 0, hash, i*4, 4 );
			}

			return hash;
		}

		/// <summary>
		/// Performs SHA-256 logical functions.  See FIPS 180-2 for
		/// complete description.  For internal use only!
		/// </summary>
		/// <param name="b">
		/// Boolean value indicating whether the desired function is Ch
		/// </param>
		/// <param name="x">First arguement</param>
		/// <param name="y">Second arguement</param>
		/// <param name="z">Third arguement</param>
		/// <returns>Function results</returns>
		private static uint Func( bool b, uint x, uint y, uint z )
		{
			// Ch function
			if( b )
				return (uint)( (x & y) ^ ((~x) & z) );
			// Maj function
			return (uint)( (x & y) ^ (x & z) ^ (y & z) );
			
		}

		/// <summary>
		/// Performs the SHA-256 shifting and rotating functions.
		/// See FIPS 180-2 for complete details.  For internal
		/// use only!
		/// </summary>
		/// <param name="i">Integer indicating which function to perform</param>
		/// <param name="x">Operand</param>
		/// <returns>Result of rotation/shift</returns>
		private static uint Sigma( int i, uint x )
		{
			uint temp;

			switch( i )
			{
				case 0:
					temp = (uint)( (x>>2) | (x<<30) );
					temp = temp ^ (uint)( (x>>13) | (x<<19) );
					temp = temp ^ (uint)( (x>>22) | (x<<10) );
					break;
				case 1:
					temp = (uint)( (x>>6) | (x<<26) );
					temp = temp ^ (uint)( (x>>11) | (x<<21) );
					temp = temp ^ (uint)( (x>>25) | (x<<7) );
					break;
				case 2:
					temp = (uint)( (x>>7) | (x<<25) );
					temp = temp ^ (uint)( (x>>18) | (x<<14) );
					temp = temp ^ (uint)(x>>3);
					break;
				case 3:
					temp = (uint)( (x>>17) | (x<<15) );
					temp = temp ^ (uint)( (x>>19) | (x<<13) );
					temp = temp ^ (uint)(x>>10);
					break;
				default:
					temp = x;
					break;
			}
			return temp;
		}
	}
}

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Svante Seleborg
Web Developer Axantum Software AB
Sweden Sweden
I've been working with all aspects of software development since 1979 - from compiler construction to management. Currently I'm an independent consultant mostly specializing in computer security. Please see my homepage for contact details.
 
I speak C like a native, and have a pretty good grasp of C++. The most recent five years C# has been the main development language. Traditionally Unix has been the dominating environment, but currently the scales have tipped over to Windows, due to market demands but I'm equally at home developing in both environments.
 
When I'm not coding I'm usually sitting on one of my 4 bikes, indoors or outdoors, on the road or in the woods.

Alphons van der Heijden
Retired Van der Heijden Holding BV
Netherlands Netherlands
I'm Alphons van der Heijden, living in Lelystad, Netherlands, Europa, Earth. And currently I'm retiring from hard working ( ;- ), owning my own company. Because I'm full of energy, and a little to young to relax ...., I don't sit down, but create and recreate software solutions, that I like. Reinventing the wheel is my second nature. My interest is in the area of Internet technologies, .NET etc. I was there in 1992 when Mosaic came out, and from that point, my life changed dramatically, and so did the world, in fact. (Y)

Dave Shaw
Software Developer
United Kingdom United Kingdom
I am currently employed as a C# / MS SQL developer for a Medical Software company working on a large enterprise system.
 
I have used Delphi and MSM MUMPS in previous roles and love both languages.
 
I'm an avid Windows Mobile fan and moderator on http://xda-developers.com. I code in C#, and C++ for WM as well as cooking custom ROMs and learning to disasm the inners of my device.

katakana2
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Romania Romania
I have some intensive experience with C#, ASP.NET and Delphi. Also I like to write API's, which I realized when I made a SmartCard library.

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