cipherutil.cs

来自「Granados是一个基于.NET的SSH客户端库。同时支持SSH1和SSH2。」· CS 代码 · 共 59 行

/* ---------------------------------------------------------------------------
 *
 * Copyright (c) Routrek Networks, Inc.    All Rights Reserved..
 * 
 * This file is a part of the Granados SSH Client Library that is subject to
 * the license included in the distributed package.
 * You may not use this file except in compliance with the license.
 * 
 * ---------------------------------------------------------------------------
 */

namespace Routrek.Crypto
{
	public class CipherUtil
	{
		internal static uint GetIntLE(byte[] src, int offset) {
			return ((uint)src[offset	  ]        |
				((uint)(src[offset + 1]) << 8)  |
				((uint)(src[offset + 2]) << 16) |
				((uint)(src[offset + 3]) << 24));
		}
		
		internal static void PutIntLE(uint val, byte[] dest, int offset) {
			dest[offset	]    = (byte)( val        & 0xff);
			dest[offset + 1] = (byte)((val >> 8 ) & 0xff);
			dest[offset + 2] = (byte)((val >> 16) & 0xff);
			dest[offset + 3] = (byte)((val >> 24) & 0xff);
		}
		
		internal static uint GetIntBE(byte[] src, int offset) {
			return (((uint)(src[offset    ]) << 24) |
				((uint)(src[offset + 1]) << 16) |
				((uint)(src[offset + 2]) << 8)  |
				((uint)src[offset + 3]));
		}
		
		internal static void PutIntBE(uint val, byte[] dest, int offset) {
			dest[offset    ] = (byte)((val >> 24) & 0xff);
			dest[offset + 1] = (byte)((val >> 16) & 0xff);
			dest[offset + 2] = (byte)((val >> 8 ) & 0xff);
			dest[offset + 3] = (byte)( val        & 0xff);
		}
		
		internal static void BlockXor(byte[] src, int s_offset, int len, byte[] dest, int d_offset) {
			for(; len > 0; len--)
				dest[d_offset++] ^= src[s_offset++];
		}
	
		public static int memcmp(byte[] d1, int o1, byte[] d2, int o2, int len) {
			for(int i=0; i<len; i++) {
				byte b1 = d1[o1+i];
				byte b2 = d2[o2+i];
				if(b1<b2) return -1;
				else if(b1>b2) return 1;
			}
			return 0;
		}
	}
}