2 OpenSSL 0.9.5a 1 Apr 2000
4 Copyright (c) 1998-2000 The OpenSSL Project
5 Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
11 The OpenSSL Project is a collaborative effort to develop a robust,
12 commercial-grade, fully featured, and Open Source toolkit implementing the
13 Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1)
14 protocols as well as a full-strength general purpose cryptography library.
15 The project is managed by a worldwide community of volunteers that use the
16 Internet to communicate, plan, and develop the OpenSSL toolkit and its
17 related documentation.
19 OpenSSL is based on the excellent SSLeay library developed from Eric A. Young
20 and Tim J. Hudson. The OpenSSL toolkit is licensed under a dual-license (the
21 OpenSSL license plus the SSLeay license) situation, which basically means
22 that you are free to get and use it for commercial and non-commercial
23 purposes as long as you fulfill the conditions of both licenses.
28 The OpenSSL toolkit includes:
31 Implementation of SSLv2, SSLv3, TLSv1 and the required code to support
32 both SSLv2, SSLv3 and TLSv1 in the one server and client.
35 General encryption and X.509 v1/v3 stuff needed by SSL/TLS but not
36 actually logically part of it. It includes routines for the following:
39 libdes - EAY's libdes DES encryption package which has been floating
40 around the net for a few years. It includes 15
41 'modes/variations' of DES (1, 2 and 3 key versions of ecb,
42 cbc, cfb and ofb; pcbc and a more general form of cfb and
43 ofb) including desx in cbc mode, a fast crypt(3), and
44 routines to read passwords from the keyboard.
46 RC2 encryption - 4 different modes, ecb, cbc, cfb and ofb.
47 Blowfish encryption - 4 different modes, ecb, cbc, cfb and ofb.
48 IDEA encryption - 4 different modes, ecb, cbc, cfb and ofb.
51 MD5 and MD2 message digest algorithms, fast implementations,
52 SHA (SHA-0) and SHA-1 message digest algorithms,
53 MDC2 message digest. A DES based hash that is popular on smart cards.
56 RSA encryption/decryption/generation.
57 There is no limit on the number of bits.
58 DSA encryption/decryption/generation.
59 There is no limit on the number of bits.
60 Diffie-Hellman key-exchange/key generation.
61 There is no limit on the number of bits.
64 X509 encoding/decoding into/from binary ASN1 and a PEM
65 based ascii-binary encoding which supports encryption with a
66 private key. Program to generate RSA and DSA certificate
67 requests and to generate RSA and DSA certificates.
70 The normal digital envelope routines and base64 encoding. Higher
71 level access to ciphers and digests by name. New ciphers can be
72 loaded at run time. The BIO io system which is a simple non-blocking
73 IO abstraction. Current methods supported are file descriptors,
74 sockets, socket accept, socket connect, memory buffer, buffering, SSL
75 client/server, file pointer, encryption, digest, non-blocking testing
79 A dynamically growing hashing system
81 A Configuration loader that uses a format similar to MS .ini files.
84 A command line tool that can be used for:
85 Creation of RSA, DH and DSA key parameters
86 Creation of X.509 certificates, CSRs and CRLs
87 Calculation of Message Digests
88 Encryption and Decryption with Ciphers
89 SSL/TLS Client and Server Tests
90 Handling of S/MIME signed or encrypted mail
96 Various companies hold various patents for various algorithms in various
97 locations around the world. _YOU_ are responsible for ensuring that your use
98 of any algorithms is legal by checking if there are any patents in your
99 country. The file contains some of the patents that we know about or are
100 rumoured to exist. This is not a definitive list.
102 RSA Data Security holds software patents on the RSA and RC5 algorithms. If
103 their ciphers are used used inside the USA (and Japan?), you must contact RSA
104 Data Security for licensing conditions. Their web page is
107 RC4 is a trademark of RSA Data Security, so use of this label should perhaps
108 only be used with RSA Data Security's permission.
110 The IDEA algorithm is patented by Ascom in Austria, France, Germany, Italy,
111 Japan, Netherlands, Spain, Sweden, Switzerland, UK and the USA. They should
112 be contacted if that algorithm is to be used, their web page is
113 http://www.ascom.ch/.
118 To install this package under a Unix derivative, read the INSTALL file. For
119 a Win32 platform, read the INSTALL.W32 file. For OpenVMS systems, read
122 For people in the USA, it is possible to compile OpenSSL to use RSA Inc.'s
123 public key library, RSAREF, by configuring OpenSSL with the option "rsaref".
125 Read the documentation in the doc/ directory. It is quite rough, but it
126 lists the functions, you will probably have to look at the code to work out
127 how to used them. Look at the example programs.
132 If you have any problems with OpenSSL then please take the following steps
135 - Download the current snapshot from ftp://ftp.openssl.org/snapshot/
136 to see if the problem has already been addressed
137 - Remove ASM versions of libraries
138 - Remove compiler optimisation flags
140 If you wish to report a bug then please include the following information in
144 Self-test report generated by 'make report'
146 OpenSSL version: output of 'openssl version -a'
147 OS Name, Version, Hardware platform
148 Compiler Details (name, version)
149 - Application Details (name, version)
150 - Problem Description (steps that will reproduce the problem, if known)
151 - Stack Traceback (if the application dumps core)
153 Report the bug to the OpenSSL project at:
155 openssl-bugs@openssl.org
157 Note that mail to openssl-bugs@openssl.org is forwarded to a public
158 mailing list. Confidential mail may be sent to openssl-security@openssl.org
159 (PGP key available from the key servers).
161 HOW TO CONTRIBUTE TO OpenSSL
162 ----------------------------
164 Development is coordinated on the openssl-dev mailing list (see
165 http://www.openssl.org for information on subscribing). If you
166 would like to submit a patch, send it to openssl-dev@openssl.org with
167 the string "[PATCH]" in the subject. Please be sure to include a
168 textual explanation of what your patch does.
170 The preferred format for changes is "diff -u" output. You might
171 generate it like this:
175 # ./Configure dist; make clean
177 # diff -urN openssl-orig openssl-work > mydiffs.patch