info.txt

大数运算库rsaref ,可用它来实现rsa 算法

             RSAREF(TM) 2.0: A Free Cryptographic Toolkit
                         General Information

                           RSA Laboratories
                        Revised March 26, 1996

This document copyright (C) 1992,1994,1996 RSA Laboratories, a division
of RSA Data Security, Inc. License is granted to reproduce, copy, post,
or distribute in any manner, provided this document is kept intact
and no modifications, deletions, or additions are made.


WHAT IS IT?

RSAREF is a free, portable software developer's library of popular
encryption and authentication algorithms. The name "RSAREF" means
"RSA reference." RSA Laboratories intends RSAREF to serve as a free,
educational reference implementation of modern public- and secret-key
cryptography.

RSAREF 2.0 supports the following algorithms:

     o    RSA encryption and key generation, as defined by RSA
          Laboratories' Public-Key Cryptography Standards (PKCS)

     o    MD2 and MD5 message digests

     o    DES (Data Encryption Standard) in cipher-block chaining mode

     o    Diffie-Hellman key agreement

     o    DESX, RSA Data Security's efficient, secure DES enhancement

     o    Triple-DES, for added security with three DES operations

Version 2.0 offers three other improvements over RSAREF 1.0: the
ability to process messages of arbitrary length in parts; the option
to process either binary data, or data encoded in printable ASCII;
and support for encrypting messages for more than one recipient.

RSAREF is written in the C programming language as a library that can
be called from an application program. A simple Internet Privacy-
Enhanced Mail (PEM) implementation can be built directly on top of
RSAREF, together with message parsing and formatting routines and
certificate-management routines. RSAREF is distributed with a
demonstration program that shows how one might build such an
implementation.


WHAT YOU CAN (AND CANNOT) DO WITH RSAREF

     1.   RSAREF is free for personal or corporate use under the
          following conditions:

          o    RSAREF, RSAREF applications, and services based on
               RSAREF applications may not be sold.

          o    You must give RSA the source code of any free RSAREF
               application you plan to distribute or deploy within
               your company. RSA will make these applications
               available to the public, free of charge.

     2.   RSAREF applications and services based on RSAREF
          applications may be sold under the following conditions:

          o    You must sign and return the RSAREF Commercial License
               Agreement to RSA (call RSA for a copy of this
               agreement). Remember, RSAREF is an unsupported toolkit.
               If you are building an application to sell, you should
               consider using fully supported libraries like RSA's
               BSAFE or TIPEM SDK's.

     3.   RSAREF applications and services based on RSAREF
          applications may be "sharewared" under the following
          conditions:

          o    Shareware authors do not need to sign a separate
               agreement with RSA, provided that their per-copy asking
               price is less than $50 and total RSAREF application
               revenue is less than $10,000 annually. Otherwise,
               shareware authors must sign and return the RSAREF
               Commercial License Agreement.

     4.   You must use the interface described in the RSAREF
          documentation.

          o    The published interface of RSAREF consists of those
               procedures and data types listed in the files
               "global.h" and "rsaref.h", as described in the RSAREF
               library reference manual (the file "rsaref.txt"). If a
               procedure is not documented in the library reference
               manual, then it is not considered published, even if an
               application could access it without modification to
               RSAREF.

          o    Furthermore, the published interface is understood as
               the reasonable interpretation of the descriptions in
               the library reference manual. Although it may well be
               possible to perform other operations with procedures
               listed in "rsaref.h" than what is described in
               "rsaref.txt", only the intended operations (e.g.,
               Diffie-Hellman key agreement with the Diffie-Hellman
               procedures) are considered to follow the published
               interface.

     5.   You can modify RSAREF to port it to other platforms, or to
          improve its performance, as long as you give a copy of the
          resulting source code to RSA. Other changes to the RSAREF
          code require written consent from RSA.

     6.   You can't send or transmit (or cause to be transmitted)
          RSAREF outside the United States or Canada, or give it to
          anyone who is not a U.S. or Canadian citizen or doesn't have
          a "green card."


HOW TO GET IT

To obtain RSAREF, read the license at the end of the note and return
a copy of the following paragraph by electronic mail to
<[e-mail]>:

     I acknowledge that I have read the RSAREF Program License
     Agreement and understand and agree to be bound by its terms and
     conditions, including without limitation its restrictions on
     foreign reshipment of the Program and information related to the
     Program. The electronic mail address to which I am requesting
     that the program be transmitted is located in the United States
     of America or Canada and I am a United States citizen, a Canadian
     citizen, or a permanent resident of the United States. The RSAREF
     Program License Agreement is the complete and exclusive agreement
     between RSA Laboratories and me relating to the Program, and
     supersedes any proposal or prior agreement, oral or written, and
     any other communications between RSA Laboratories and me relating
     to the Program.

RSAREF is distributed by electronic mail in "uuencoded", compressed
TAR format. When you receive it, store the contents of the message in
a file, and run your operating system's "uudecode", "uncompress" and
TAR programs. For example, suppose you store the contents of your
message in the file 'contents'. You would run the commands:

     uudecode contents             # produces rsaref.tar.Z
     uncompress rsaref.tar.Z       # produces rsaref.tar
     tar xvf rsaref.tar

You can also get a "uuencoded" PKZIP(TM) version of RSAREF. Just ask
for the ZIP file when you return the acknowledgment.

RSAREF includes about 60 files organized into the following
subdirectories:

     doc       documentation
     install   makefiles for various operating systems
     rdemo     demonstration programs and test scripts
     source    source code and include files

RSAREF is also available via anonymous FTP to 'ftp.rsa.com'. Along with
RSAREF you can get RIPEM, Mark Riordan's RSAREF-based privacy-enhanced
mail application, and an Emacs command interface to RIPEM. See the
file 'README' in the FTP directory 'rsaref' for more information.


USERS' GROUP

RSA Laboratories maintains the electronic-mail users' group
<[e-mail]> for discussion of RSAREF applications, bug
fixes, etc. To join the users' group, send electronic mail to
<[e-mail]>.


REGISTRATION

RSAREF users who register with RSA Laboratories are entitled to free
RSAREF upgrades and bug fixes as soon as they become available and a
50% discount on selected RSA Data Security products. To register,
send your name, address, and telephone number to
<[e-mail]>.


PUBLIC-KEY CERTIFICATION

Verisign offers public-key certification services conforming to PKCS
standards. For more information, please send electronic mail to
<[e-mail]>.


PKCS: THE PUBLIC-KEY CRYPTOGRAPHY STANDARDS

To obtain copies of RSA Laboratories' Public-Key Cryptography
Standards (PKCS), send electronic mail to <[e-mail]>.


OTHER QUESTIONS

If you have questions on RSAREF software, licenses, export
restrictions, or other RSA Laboratories offerings, send electronic
mail to <[e-mail]>.


AUTHORS

RSAREF was written by the staff of RSA Laboratories with assistance