VB中實(shí)現(xiàn)MD5加密
使用方法：
msgbox DigestStrToHexStr("111")
源代碼:
-----------剪切線------------------------------------------------------------
Option Explicit
'/******************************************************************************
' * Copyright (C) 2000 by Robert Hubley. *
' * All rights reserved. *
' * *
' * This software is provided ``AS IS' and any express or implied *
' * warranties, including, but not limited to, the implied warranties of *
' * merchantability and fitness for a particular purpose, are disclaimed. *
' * In no event shall the authors be liable for any direct, indirect, *
' * incidental, special, exemplary, or consequential damages (including, but *
' * not limited to, procurement of substitute goods or services; loss of use, *
' * data, or profits; or business interruption) however caused and on any *
' * theory of liability, whether in contract, strict liability, or tort *
' * (including negligence or otherwise) arising in any way out of the use of *
' * this software, even if advised of the possibility of such damage. *
' * *
' ******************************************************************************
'
' CLASS: MD5
'
' DESCRIPTION:
' This is a class which encapsulates a set of MD5 Message Digest functions.
' MD5 algorithm produces a 128 bit digital fingerprint (signature) from an
' dataset of arbitrary length. For details see RFC 1321 (summarized below).
' This implementation is derived from the RSA Data Security, Inc. MD5 Message-Digest
' algorithm reference implementation (originally written in C)
'
' AUTHOR:
' Robert M. Hubley 12/1999
'
'
' NOTES:
' Network Working Group R. Rivest
' Request for Comments: 1321 MIT Laboratory for Computer Science
' and RSA Data Security, Inc.
' April 1992
'
'
' The MD5 Message-Digest Algorithm
'
' Summary
'
' This document describes the MD5 message-digest algorithm. The
' algorithm takes as input a message of arbitrary length and produces
' as output a 128-bit "fingerprint" or "message digest" of the input.
' It is conjectured that it is computationally infeasible to produce
' two messages having the same message digest, or to produce any
' message having a given prespecified target message digest. The MD5
' algorithm is intended for digital signature applications, where a
' large file must be "compressed" in a secure manner before being
' encrypted with a private (secret) key under a public-key cryptosystem
' such as RSA.
'
' The MD5 algorithm is designed to be quite fast on 32-bit machines. In
' addition, the MD5 algorithm does not require any large substitution
' tables; the algorithm can be coded quite compactly.
'
' The MD5 algorithm is an extension of the MD4 message-digest algorithm
' 1,2]. MD5 is slightly slower than MD4, but is more "conservative" in
' design. MD5 was designed because it was felt that MD4 was perhaps
' being adopted for use more quickly than justified by the existing
' critical review; because MD4 was designed to be exceptionally fast,
' it is "at the edge" in terms of risking successful cryptanalytic
' attack. MD5 backs off a bit, giving up a little in speed for a much
' greater likelihood of ultimate security. It incorporates some
' suggestions made by various reviewers, and contains additional
' optimizations. The MD5 algorithm is being placed in the public domain
' for review and possible adoption as a standard.
'
' RFC Author:
' Ronald L.Rivest
' Massachusetts Institute of Technology
' Laboratory for Computer Science
' NE43 -324545 Technology Square
' Cambridge, MA 02139-1986
' Phone: (617) 253-5880
' EMail: Rivest@ theory.lcs.mit.edu
'
'
'
' CHANGE HISTORY:
'
' 0.1.0 RMH 1999/12/29 Original version
'
'
'=
'= Class Constants
'=
Private Const OFFSET_4 = 4294967296#
Private Const MAXINT_4 = 2147483647
