4 Copyright (c) 1998-2011 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 was floating
40 around the net for a few years, and was then relicensed by
41 him as part of SSLeay. It includes 15 'modes/variations'
42 of DES (1, 2 and 3 key versions of ecb, cbc, cfb and ofb;
43 pcbc and a more general form of cfb and ofb) including desx
44 in cbc mode, a fast crypt(3), and routines to read
45 passwords from the keyboard.
47 RC2 encryption - 4 different modes, ecb, cbc, cfb and ofb.
48 Blowfish encryption - 4 different modes, ecb, cbc, cfb and ofb.
49 IDEA encryption - 4 different modes, ecb, cbc, cfb and ofb.
52 MD5 and MD2 message digest algorithms, fast implementations,
53 SHA (SHA-0) and SHA-1 message digest algorithms,
54 MDC2 message digest. A DES based hash that is popular on smart cards.
57 RSA encryption/decryption/generation.
58 There is no limit on the number of bits.
59 DSA encryption/decryption/generation.
60 There is no limit on the number of bits.
61 Diffie-Hellman key-exchange/key generation.
62 There is no limit on the number of bits.
65 X509 encoding/decoding into/from binary ASN1 and a PEM
66 based ASCII-binary encoding which supports encryption with a
67 private key. Program to generate RSA and DSA certificate
68 requests and to generate RSA and DSA certificates.
71 The normal digital envelope routines and base64 encoding. Higher
72 level access to ciphers and digests by name. New ciphers can be
73 loaded at run time. The BIO io system which is a simple non-blocking
74 IO abstraction. Current methods supported are file descriptors,
75 sockets, socket accept, socket connect, memory buffer, buffering, SSL
76 client/server, file pointer, encryption, digest, non-blocking testing
80 A dynamically growing hashing system
82 A Configuration loader that uses a format similar to MS .ini files.
85 A command line tool that can be used for:
86 Creation of RSA, DH and DSA key parameters
87 Creation of X.509 certificates, CSRs and CRLs
88 Calculation of Message Digests
89 Encryption and Decryption with Ciphers
90 SSL/TLS Client and Server Tests
91 Handling of S/MIME signed or encrypted mail
96 To install this package under a Unix derivative, read the INSTALL file. For
97 a Win32 platform, read the INSTALL.W32 file. For OpenVMS systems, read
100 Read the documentation in the doc/ directory. It is quite rough, but it
101 lists the functions; you will probably have to look at the code to work out
102 how to use them. Look at the example programs.
107 For some platforms, there are some known problems that may affect the user
108 or application author. We try to collect those in doc/PROBLEMS, with current
109 thoughts on how they should be solved in a future of OpenSSL.
114 See the OpenSSL website www.openssl.org for details of how to obtain
115 commercial technical support.
117 If you have any problems with OpenSSL then please take the following steps
120 - Download the current snapshot from ftp://ftp.openssl.org/snapshot/
121 to see if the problem has already been addressed
122 - Remove ASM versions of libraries
123 - Remove compiler optimisation flags
125 If you wish to report a bug then please include the following information in
129 Self-test report generated by 'make report'
131 OpenSSL version: output of 'openssl version -a'
132 OS Name, Version, Hardware platform
133 Compiler Details (name, version)
134 - Application Details (name, version)
135 - Problem Description (steps that will reproduce the problem, if known)
136 - Stack Traceback (if the application dumps core)
140 openssl-bugs@openssl.org
142 Note that the request tracker should NOT be used for general assistance
143 or support queries. Just because something doesn't work the way you expect
144 does not mean it is necessarily a bug in OpenSSL.
146 Note that mail to openssl-bugs@openssl.org is recorded in the public
147 request tracker database (see https://www.openssl.org/support/rt.html
148 for details) and also forwarded to a public mailing list. Confidential
149 mail may be sent to openssl-security@openssl.org (PGP key available from
152 HOW TO CONTRIBUTE TO OpenSSL
153 ----------------------------
155 Development is coordinated on the openssl-dev mailing list (see
156 http://www.openssl.org for information on subscribing). If you
157 would like to submit a patch, send it to openssl-bugs@openssl.org with
158 the string "[PATCH]" in the subject. Please be sure to include a
159 textual explanation of what your patch does.
161 If you are unsure as to whether a feature will be useful for the general
162 OpenSSL community please discuss it on the openssl-dev mailing list first.
163 Someone may be already working on the same thing or there may be a good
164 reason as to why that feature isn't implemented.
166 Patches should be as up to date as possible, preferably relative to the
167 current Git or the last snapshot. They should follow the coding style of
168 OpenSSL and compile without warnings. Some of the core team developer targets
169 can be used for testing purposes, (debug-steve64, debug-geoff etc). OpenSSL
170 compiles on many varied platforms: try to ensure you only use portable
173 Note: For legal reasons, contributions from the US can be accepted only
174 if a TSU notification and a copy of the patch are sent to crypt@bis.doc.gov
175 (formerly BXA) with a copy to the ENC Encryption Request Coordinator;
176 please take some time to look at
177 http://www.bis.doc.gov/Encryption/PubAvailEncSourceCodeNofify.html [sic]
179 http://w3.access.gpo.gov/bis/ear/pdf/740.pdf (EAR Section 740.13(e))
180 for the details. If "your encryption source code is too large to serve as
181 an email attachment", they are glad to receive it by fax instead; hope you
182 have a cheap long-distance plan.
184 Our preferred format for changes is "diff -u" output. You might
185 generate it like this:
189 # ./Configure dist; make clean
191 # diff -ur openssl-orig openssl-work > mydiffs.patch