2 OpenSSL 0.9.8e 23 Feb 2007
4 Copyright (c) 1998-2007 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 rumored to exist. This is not a definitive list.
102 RSA Security holds software patents on the RC5 algorithm. If you
103 intend to use this cipher, you must contact RSA Security for
104 licensing conditions. Their web page is http://www.rsasecurity.com/.
106 RC4 is a trademark of RSA Security, so use of this label should perhaps
107 only be used with RSA Security's permission.
109 The IDEA algorithm is patented by Ascom in Austria, France, Germany, Italy,
110 Japan, the Netherlands, Spain, Sweden, Switzerland, UK and the USA. They
111 should be contacted if that algorithm is to be used; their web page is
112 http://www.ascom.ch/.
114 The MDC2 algorithm is patented by IBM.
116 NTT and Mitsubishi have patents and pending patents on the Camellia
117 algorithm, but allow use at no charge without requiring an explicit
118 licensing agreement: http://info.isl.ntt.co.jp/crypt/eng/info/chiteki.html
123 To install this package under a Unix derivative, read the INSTALL file. For
124 a Win32 platform, read the INSTALL.W32 file. For OpenVMS systems, read
127 Read the documentation in the doc/ directory. It is quite rough, but it
128 lists the functions; you will probably have to look at the code to work out
129 how to use them. Look at the example programs.
134 For some platforms, there are some known problems that may affect the user
135 or application author. We try to collect those in doc/PROBLEMS, with current
136 thoughts on how they should be solved in a future of OpenSSL.
141 If you have any problems with OpenSSL then please take the following steps
144 - Download the current snapshot from ftp://ftp.openssl.org/snapshot/
145 to see if the problem has already been addressed
146 - Remove ASM versions of libraries
147 - Remove compiler optimisation flags
149 If you wish to report a bug then please include the following information in
153 Self-test report generated by 'make report'
155 OpenSSL version: output of 'openssl version -a'
156 OS Name, Version, Hardware platform
157 Compiler Details (name, version)
158 - Application Details (name, version)
159 - Problem Description (steps that will reproduce the problem, if known)
160 - Stack Traceback (if the application dumps core)
162 Report the bug to the OpenSSL project via the Request Tracker
163 (http://www.openssl.org/support/rt2.html) by mail to:
165 openssl-bugs@openssl.org
167 Note that mail to openssl-bugs@openssl.org is recorded in the publicly
168 readable request tracker database and is forwarded to a public
169 mailing list. Confidential mail may be sent to openssl-security@openssl.org
170 (PGP key available from the key servers).
172 HOW TO CONTRIBUTE TO OpenSSL
173 ----------------------------
175 Development is coordinated on the openssl-dev mailing list (see
176 http://www.openssl.org for information on subscribing). If you
177 would like to submit a patch, send it to openssl-dev@openssl.org with
178 the string "[PATCH]" in the subject. Please be sure to include a
179 textual explanation of what your patch does.
181 Note: For legal reasons, contributions from the US can be accepted only
182 if a TSU notification and a copy of the patch are sent to crypt@bis.doc.gov
183 (formerly BXA) with a copy to the ENC Encryption Request Coordinator;
184 please take some time to look at
185 http://www.bis.doc.gov/Encryption/PubAvailEncSourceCodeNofify.html [sic]
187 http://w3.access.gpo.gov/bis/ear/pdf/740.pdf (EAR Section 740.13(e))
188 for the details. If "your encryption source code is too large to serve as
189 an email attachment", they are glad to receive it by fax instead; hope you
190 have a cheap long-distance plan.
192 Our preferred format for changes is "diff -u" output. You might
193 generate it like this:
197 # ./Configure dist; make clean
199 # diff -ur openssl-orig openssl-work > mydiffs.patch