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OpenSSL 1.0.2u 20 Dec 2019

WARNING
 -------

This version of OpenSSL is built in a way that supports operation in
 the so called FIPS mode. Note though that the library as we build it
 is not FIPS 140-2 validated and the FIPS mode is present for testing
 purposes only.

This version also contains a few differences from the upstream code
 some of which are:
   * The FIPS validation support is significantly different from the
     upstream FIPS support. For example the FIPS integrity verification
     check is implemented differently as the FIPS module is built inside
     the shared library. The HMAC-SHA256 checksums of the whole shared
     libraries are verified. Also note that the FIPS integrity
     verification check requires that the libcrypto and libssl shared
     library files are unmodified which means that it will fail if these
     files are changed for example by prelink.
   * If the file /etc/system-fips is present the integrity verification
     and selftests of the crypto algorithms are run inside the library
     constructor code.
   * With the /etc/system-fips present the module respects the kernel
     FIPS flag /proc/sys/crypto/fips and tries to initialize the FIPS mode
     if it is set to 1 aborting if the FIPS mode could not be initialized.
     With the /etc/system-fips present it is also possible to force the
     OpenSSL library to FIPS mode especially for debugging purposes by
     setting the environment variable OPENSSL_FORCE_FIPS_MODE.
   * If the environment variable OPENSSL_NO_DEFAULT_ZLIB is set the module
     will not automatically load the built in compression method ZLIB
     when initialized. Applications can still explicitely ask for ZLIB
     compression method.
   * The library was patched so the certificates, CRLs and other objects
     signed with use of MD5 fail verification as the MD5 is too insecure
     to be used for signatures. If the environment variable
     OPENSSL_ENABLE_MD5_VERIFY is set, the verification can proceed
     normally.
   * If the OPENSSL_ENFORCE_MODULUS_BITS environment variable is set,
     the library will not allow generation of DSA and RSA keys with
     other lengths than specified in the FIPS 186-4 standard.

DESCRIPTION
 -----------

The OpenSSL Project is a collaborative effort to develop a robust,
 commercial-grade, fully featured, and Open Source toolkit implementing the
 Secure Sockets Layer (SSLv3) and Transport Layer Security (TLS) protocols as
 well as a full-strength general purpose cryptograpic library. The project is
 managed by a worldwide community of volunteers that use the Internet to
 communicate, plan, and develop the OpenSSL toolkit and its related
 documentation.

OpenSSL is descended from the SSLeay library developed by Eric A. Young
 and Tim J. Hudson.  The OpenSSL toolkit is licensed under a dual-license (the
 OpenSSL license plus the SSLeay license), which means that you are free to
 get and use it for commercial and non-commercial purposes as long as you
 fulfill the conditions of both licenses.

OVERVIEW
 --------

The OpenSSL toolkit includes:

libssl.a:
     Provides the client and server-side implementations for SSLv3 and TLS.

libcrypto.a:
     Provides general cryptographic and X.509 support needed by SSL/TLS but
     not logically part of it.

openssl:
     A command line tool that can be used for:
        Creation of key parameters
        Creation of X.509 certificates, CSRs and CRLs
        Calculation of message digests
        Encryption and decryption
        SSL/TLS client and server tests
        Handling of S/MIME signed or encrypted mail
        And more...

INSTALLATION
 ------------

See the appropriate file:
        INSTALL         Linux, Unix, etc.
        INSTALL.DJGPP   DOS platform with DJGPP
        INSTALL.NW      Netware
        INSTALL.OS2     OS/2
        INSTALL.VMS     VMS
        INSTALL.W32     Windows (32bit)
        INSTALL.W64     Windows (64bit)
        INSTALL.WCE     Windows CE

SUPPORT
 -------

See the OpenSSL website www.openssl.org for details on how to obtain
 commercial technical support.

If you have any problems with OpenSSL then please take the following steps
 first:

- Download the latest version from the repository
      to see if the problem has already been addressed
    - Configure with no-asm
    - Remove compiler optimisation flags

If you wish to report a bug then please include the following information
 and create an issue on GitHub:

- On Unix systems:
        Self-test report generated by 'make report'
    - On other systems:
        OpenSSL version: output of 'openssl version -a'
        OS Name, Version, Hardware platform
        Compiler Details (name, version)
    - Application Details (name, version)
    - Problem Description (steps that will reproduce the problem, if known)
    - Stack Traceback (if the application dumps core)

Just because something doesn't work the way you expect does not mean it
 is necessarily a bug in OpenSSL.

HOW TO CONTRIBUTE TO OpenSSL
 ----------------------------

See CONTRIBUTING

LEGALITIES
 ----------

A number of nations restrict the use or export of cryptography. If you
 are potentially subject to such restrictions you should seek competent
 professional legal advice before attempting to develop or distribute
 cryptographic code.

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