This file gives a brief overview of the major changes between each OpenSSL
release. For more details please read the CHANGES file.
- Major changes between SSLeay 0.9.1c and OpenSSL 0.9.2b:
+ Major changes between OpenSSL 1.0.1c and OpenSSL 1.0.1d:
+
+ o Fix renegotiation in TLS 1.1, 1.2 by using the correct TLS version.
+ o Include the fips configuration module.
+ o Fix OCSP bad key DoS attack CVE-2013-0166
+ o Fix for SSL/TLS/DTLS CBC plaintext recovery attack CVE-2013-0169
+ o Fix for TLS AESNI record handling flaw CVE-2012-2686
+
+ Major changes between OpenSSL 1.0.1b and OpenSSL 1.0.1c:
+
+ o Fix TLS/DTLS record length checking bug CVE-2012-2333
+ o Don't attempt to use non-FIPS composite ciphers in FIPS mode.
+
+ Major changes between OpenSSL 1.0.1a and OpenSSL 1.0.1b:
+
+ o Fix compilation error on non-x86 platforms.
+ o Make FIPS capable OpenSSL ciphers work in non-FIPS mode.
+ o Fix SSL_OP_NO_TLSv1_1 clash with SSL_OP_ALL in OpenSSL 1.0.0
+
+ Major changes between OpenSSL 1.0.1 and OpenSSL 1.0.1a:
+
+ o Fix for ASN1 overflow bug CVE-2012-2110
+ o Workarounds for some servers that hang on long client hellos.
+ o Fix SEGV in AES code.
+
+ Major changes between OpenSSL 1.0.0h and OpenSSL 1.0.1:
+
+ o TLS/DTLS heartbeat support.
+ o SCTP support.
+ o RFC 5705 TLS key material exporter.
+ o RFC 5764 DTLS-SRTP negotiation.
+ o Next Protocol Negotiation.
+ o PSS signatures in certificates, requests and CRLs.
+ o Support for password based recipient info for CMS.
+ o Support TLS v1.2 and TLS v1.1.
+ o Preliminary FIPS capability for unvalidated 2.0 FIPS module.
+ o SRP support.
+
+ Major changes between OpenSSL 1.0.0g and OpenSSL 1.0.0h:
+
+ o Fix for CMS/PKCS#7 MMA CVE-2012-0884
+ o Corrected fix for CVE-2011-4619
+ o Various DTLS fixes.
+
+ Major changes between OpenSSL 1.0.0f and OpenSSL 1.0.0g:
+
+ o Fix for DTLS DoS issue CVE-2012-0050
+
+ Major changes between OpenSSL 1.0.0e and OpenSSL 1.0.0f:
+
+ o Fix for DTLS plaintext recovery attack CVE-2011-4108
+ o Clear block padding bytes of SSL 3.0 records CVE-2011-4576
+ o Only allow one SGC handshake restart for SSL/TLS CVE-2011-4619
+ o Check parameters are not NULL in GOST ENGINE CVE-2012-0027
+ o Check for malformed RFC3779 data CVE-2011-4577
+
+ Major changes between OpenSSL 1.0.0d and OpenSSL 1.0.0e:
+
+ o Fix for CRL vulnerability issue CVE-2011-3207
+ o Fix for ECDH crashes CVE-2011-3210
+ o Protection against EC timing attacks.
+ o Support ECDH ciphersuites for certificates using SHA2 algorithms.
+ o Various DTLS fixes.
+
+ Major changes between OpenSSL 1.0.0c and OpenSSL 1.0.0d:
+
+ o Fix for security issue CVE-2011-0014
+
+ Major changes between OpenSSL 1.0.0b and OpenSSL 1.0.0c:
+
+ o Fix for security issue CVE-2010-4180
+ o Fix for CVE-2010-4252
+ o Fix mishandling of absent EC point format extension.
+ o Fix various platform compilation issues.
+ o Corrected fix for security issue CVE-2010-3864.
+
+ Major changes between OpenSSL 1.0.0a and OpenSSL 1.0.0b:
+
+ o Fix for security issue CVE-2010-3864.
+ o Fix for CVE-2010-2939
+ o Fix WIN32 build system for GOST ENGINE.
+
+ Major changes between OpenSSL 1.0.0 and OpenSSL 1.0.0a:
+
+ o Fix for security issue CVE-2010-1633.
+ o GOST MAC and CFB fixes.
+
+ Major changes between OpenSSL 0.9.8n and OpenSSL 1.0.0:
+
+ o RFC3280 path validation: sufficient to process PKITS tests.
+ o Integrated support for PVK files and keyblobs.
+ o Change default private key format to PKCS#8.
+ o CMS support: able to process all examples in RFC4134
+ o Streaming ASN1 encode support for PKCS#7 and CMS.
+ o Multiple signer and signer add support for PKCS#7 and CMS.
+ o ASN1 printing support.
+ o Whirlpool hash algorithm added.
+ o RFC3161 time stamp support.
+ o New generalised public key API supporting ENGINE based algorithms.
+ o New generalised public key API utilities.
+ o New ENGINE supporting GOST algorithms.
+ o SSL/TLS GOST ciphersuite support.
+ o PKCS#7 and CMS GOST support.
+ o RFC4279 PSK ciphersuite support.
+ o Supported points format extension for ECC ciphersuites.
+ o ecdsa-with-SHA224/256/384/512 signature types.
+ o dsa-with-SHA224 and dsa-with-SHA256 signature types.
+ o Opaque PRF Input TLS extension support.
+ o Updated time routines to avoid OS limitations.
+
+ Major changes between OpenSSL 0.9.8q and OpenSSL 0.9.8r:
+
+ o Fix for security issue CVE-2011-0014
+
+ Major changes between OpenSSL 0.9.8p and OpenSSL 0.9.8q:
+
+ o Fix for security issue CVE-2010-4180
+ o Fix for CVE-2010-4252
+
+ Major changes between OpenSSL 0.9.8o and OpenSSL 0.9.8p:
+
+ o Fix for security issue CVE-2010-3864.
+
+ Major changes between OpenSSL 0.9.8n and OpenSSL 0.9.8o:
+
+ o Fix for security issue CVE-2010-0742.
+ o Various DTLS fixes.
+ o Recognise SHA2 certificates if only SSL algorithms added.
+ o Fix for no-rc4 compilation.
+ o Chil ENGINE unload workaround.
+
+ Major changes between OpenSSL 0.9.8m and OpenSSL 0.9.8n:
+
+ o CFB cipher definition fixes.
+ o Fix security issues CVE-2010-0740 and CVE-2010-0433.
+
+ Major changes between OpenSSL 0.9.8l and OpenSSL 0.9.8m:
+
+ o Cipher definition fixes.
+ o Workaround for slow RAND_poll() on some WIN32 versions.
+ o Remove MD2 from algorithm tables.
+ o SPKAC handling fixes.
+ o Support for RFC5746 TLS renegotiation extension.
+ o Compression memory leak fixed.
+ o Compression session resumption fixed.
+ o Ticket and SNI coexistence fixes.
+ o Many fixes to DTLS handling.
+
+ Major changes between OpenSSL 0.9.8k and OpenSSL 0.9.8l:
+
+ o Temporary work around for CVE-2009-3555: disable renegotiation.
+
+ Major changes between OpenSSL 0.9.8j and OpenSSL 0.9.8k:
+
+ o Fix various build issues.
+ o Fix security issues (CVE-2009-0590, CVE-2009-0591, CVE-2009-0789)
+
+ Major changes between OpenSSL 0.9.8i and OpenSSL 0.9.8j:
+
+ o Fix security issue (CVE-2008-5077)
+ o Merge FIPS 140-2 branch code.
+
+ Major changes between OpenSSL 0.9.8g and OpenSSL 0.9.8h:
+
+ o CryptoAPI ENGINE support.
+ o Various precautionary measures.
+ o Fix for bugs affecting certificate request creation.
+ o Support for local machine keyset attribute in PKCS#12 files.
+
+ Major changes between OpenSSL 0.9.8f and OpenSSL 0.9.8g:
+
+ o Backport of CMS functionality to 0.9.8.
+ o Fixes for bugs introduced with 0.9.8f.
+
+ Major changes between OpenSSL 0.9.8e and OpenSSL 0.9.8f:
+
+ o Add gcc 4.2 support.
+ o Add support for AES and SSE2 assembly lanugauge optimization
+ for VC++ build.
+ o Support for RFC4507bis and server name extensions if explicitly
+ selected at compile time.
+ o DTLS improvements.
+ o RFC4507bis support.
+ o TLS Extensions support.
+
+ Major changes between OpenSSL 0.9.8d and OpenSSL 0.9.8e:
+
+ o Various ciphersuite selection fixes.
+ o RFC3779 support.
+
+ Major changes between OpenSSL 0.9.8c and OpenSSL 0.9.8d:
+
+ o Introduce limits to prevent malicious key DoS (CVE-2006-2940)
+ o Fix security issues (CVE-2006-2937, CVE-2006-3737, CVE-2006-4343)
+ o Changes to ciphersuite selection algorithm
+
+ Major changes between OpenSSL 0.9.8b and OpenSSL 0.9.8c:
+
+ o Fix Daniel Bleichenbacher forged signature attack, CVE-2006-4339
+ o New cipher Camellia
+
+ Major changes between OpenSSL 0.9.8a and OpenSSL 0.9.8b:
+
+ o Cipher string fixes.
+ o Fixes for VC++ 2005.
+ o Updated ECC cipher suite support.
+ o New functions EVP_CIPHER_CTX_new() and EVP_CIPHER_CTX_free().
+ o Zlib compression usage fixes.
+ o Built in dynamic engine compilation support on Win32.
+ o Fixes auto dynamic engine loading in Win32.
+
+ Major changes between OpenSSL 0.9.8 and OpenSSL 0.9.8a:
+
+ o Fix potential SSL 2.0 rollback, CVE-2005-2969
+ o Extended Windows CE support
+
+ Major changes between OpenSSL 0.9.7g and OpenSSL 0.9.8:
+
+ o Major work on the BIGNUM library for higher efficiency and to
+ make operations more streamlined and less contradictory. This
+ is the result of a major audit of the BIGNUM library.
+ o Addition of BIGNUM functions for fields GF(2^m) and NIST
+ curves, to support the Elliptic Crypto functions.
+ o Major work on Elliptic Crypto; ECDH and ECDSA added, including
+ the use through EVP, X509 and ENGINE.
+ o New ASN.1 mini-compiler that's usable through the OpenSSL
+ configuration file.
+ o Added support for ASN.1 indefinite length constructed encoding.
+ o New PKCS#12 'medium level' API to manipulate PKCS#12 files.
+ o Complete rework of shared library construction and linking
+ programs with shared or static libraries, through a separate
+ Makefile.shared.
+ o Rework of the passing of parameters from one Makefile to another.
+ o Changed ENGINE framework to load dynamic engine modules
+ automatically from specifically given directories.
+ o New structure and ASN.1 functions for CertificatePair.
+ o Changed the ZLIB compression method to be stateful.
+ o Changed the key-generation and primality testing "progress"
+ mechanism to take a structure that contains the ticker
+ function and an argument.
+ o New engine module: GMP (performs private key exponentiation).
+ o New engine module: VIA PadLOck ACE extension in VIA C3
+ Nehemiah processors.
+ o Added support for IPv6 addresses in certificate extensions.
+ See RFC 1884, section 2.2.
+ o Added support for certificate policy mappings, policy
+ constraints and name constraints.
+ o Added support for multi-valued AVAs in the OpenSSL
+ configuration file.
+ o Added support for multiple certificates with the same subject
+ in the 'openssl ca' index file.
+ o Make it possible to create self-signed certificates using
+ 'openssl ca -selfsign'.
+ o Make it possible to generate a serial number file with
+ 'openssl ca -create_serial'.
+ o New binary search functions with extended functionality.
+ o New BUF functions.
+ o New STORE structure and library to provide an interface to all
+ sorts of data repositories. Supports storage of public and
+ private keys, certificates, CRLs, numbers and arbitrary blobs.
+ This library is unfortunately unfinished and unused withing
+ OpenSSL.
+ o New control functions for the error stack.
+ o Changed the PKCS#7 library to support one-pass S/MIME
+ processing.
+ o Added the possibility to compile without old deprecated
+ functionality with the OPENSSL_NO_DEPRECATED macro or the
+ 'no-deprecated' argument to the config and Configure scripts.
+ o Constification of all ASN.1 conversion functions, and other
+ affected functions.
+ o Improved platform support for PowerPC.
+ o New FIPS 180-2 algorithms (SHA-224, -256, -384 and -512).
+ o New X509_VERIFY_PARAM structure to support parametrisation
+ of X.509 path validation.
+ o Major overhaul of RC4 performance on Intel P4, IA-64 and
+ AMD64.
+ o Changed the Configure script to have some algorithms disabled
+ by default. Those can be explicitely enabled with the new
+ argument form 'enable-xxx'.
+ o Change the default digest in 'openssl' commands from MD5 to
+ SHA-1.
+ o Added support for DTLS.
+ o New BIGNUM blinding.
+ o Added support for the RSA-PSS encryption scheme
+ o Added support for the RSA X.931 padding.
+ o Added support for BSD sockets on NetWare.
+ o Added support for files larger than 2GB.
+ o Added initial support for Win64.
+ o Added alternate pkg-config files.
+
+ Major changes between OpenSSL 0.9.7l and OpenSSL 0.9.7m:
+
+ o FIPS 1.1.1 module linking.
+ o Various ciphersuite selection fixes.
+
+ Major changes between OpenSSL 0.9.7k and OpenSSL 0.9.7l:
+
+ o Introduce limits to prevent malicious key DoS (CVE-2006-2940)
+ o Fix security issues (CVE-2006-2937, CVE-2006-3737, CVE-2006-4343)
+
+ Major changes between OpenSSL 0.9.7j and OpenSSL 0.9.7k:
+
+ o Fix Daniel Bleichenbacher forged signature attack, CVE-2006-4339
+
+ Major changes between OpenSSL 0.9.7i and OpenSSL 0.9.7j:
+
+ o Visual C++ 2005 fixes.
+ o Update Windows build system for FIPS.
+
+ Major changes between OpenSSL 0.9.7h and OpenSSL 0.9.7i:
+
+ o Give EVP_MAX_MD_SIZE it's old value, except for a FIPS build.
+
+ Major changes between OpenSSL 0.9.7g and OpenSSL 0.9.7h:
+
+ o Fix SSL 2.0 Rollback, CVE-2005-2969
+ o Allow use of fixed-length exponent on DSA signing
+ o Default fixed-window RSA, DSA, DH private-key operations
+
+ Major changes between OpenSSL 0.9.7f and OpenSSL 0.9.7g:
+
+ o More compilation issues fixed.
+ o Adaptation to more modern Kerberos API.
+ o Enhanced or corrected configuration for Solaris64, Mingw and Cygwin.
+ o Enhanced x86_64 assembler BIGNUM module.
+ o More constification.
+ o Added processing of proxy certificates (RFC 3820).
+
+ Major changes between OpenSSL 0.9.7e and OpenSSL 0.9.7f:
+
+ o Several compilation issues fixed.
+ o Many memory allocation failure checks added.
+ o Improved comparison of X509 Name type.
+ o Mandatory basic checks on certificates.
+ o Performance improvements.
+
+ Major changes between OpenSSL 0.9.7d and OpenSSL 0.9.7e:
+
+ o Fix race condition in CRL checking code.
+ o Fixes to PKCS#7 (S/MIME) code.
+
+ Major changes between OpenSSL 0.9.7c and OpenSSL 0.9.7d:
+
+ o Security: Fix Kerberos ciphersuite SSL/TLS handshaking bug
+ o Security: Fix null-pointer assignment in do_change_cipher_spec()
+ o Allow multiple active certificates with same subject in CA index
+ o Multiple X509 verification fixes
+ o Speed up HMAC and other operations
+
+ Major changes between OpenSSL 0.9.7b and OpenSSL 0.9.7c:
+
+ o Security: fix various ASN1 parsing bugs.
+ o New -ignore_err option to OCSP utility.
+ o Various interop and bug fixes in S/MIME code.
+ o SSL/TLS protocol fix for unrequested client certificates.
+
+ Major changes between OpenSSL 0.9.7a and OpenSSL 0.9.7b:
+
+ o Security: counter the Klima-Pokorny-Rosa extension of
+ Bleichbacher's attack
+ o Security: make RSA blinding default.
+ o Configuration: Irix fixes, AIX fixes, better mingw support.
+ o Support for new platforms: linux-ia64-ecc.
+ o Build: shared library support fixes.
+ o ASN.1: treat domainComponent correctly.
+ o Documentation: fixes and additions.
+
+ Major changes between OpenSSL 0.9.7 and OpenSSL 0.9.7a:
+
+ o Security: Important security related bugfixes.
+ o Enhanced compatibility with MIT Kerberos.
+ o Can be built without the ENGINE framework.
+ o IA32 assembler enhancements.
+ o Support for new platforms: FreeBSD/IA64 and FreeBSD/Sparc64.
+ o Configuration: the no-err option now works properly.
+ o SSL/TLS: now handles manual certificate chain building.
+ o SSL/TLS: certain session ID malfunctions corrected.
+
+ Major changes between OpenSSL 0.9.6 and OpenSSL 0.9.7:
+
+ o New library section OCSP.
+ o Complete rewrite of ASN1 code.
+ o CRL checking in verify code and openssl utility.
+ o Extension copying in 'ca' utility.
+ o Flexible display options in 'ca' utility.
+ o Provisional support for international characters with UTF8.
+ o Support for external crypto devices ('engine') is no longer
+ a separate distribution.
+ o New elliptic curve library section.
+ o New AES (Rijndael) library section.
+ o Support for new platforms: Windows CE, Tandem OSS, A/UX, AIX 64-bit,
+ Linux x86_64, Linux 64-bit on Sparc v9
+ o Extended support for some platforms: VxWorks
+ o Enhanced support for shared libraries.
+ o Now only builds PIC code when shared library support is requested.
+ o Support for pkg-config.
+ o Lots of new manuals.
+ o Makes symbolic links to or copies of manuals to cover all described
+ functions.
+ o Change DES API to clean up the namespace (some applications link also
+ against libdes providing similar functions having the same name).
+ Provide macros for backward compatibility (will be removed in the
+ future).
+ o Unify handling of cryptographic algorithms (software and engine)
+ to be available via EVP routines for asymmetric and symmetric ciphers.
+ o NCONF: new configuration handling routines.
+ o Change API to use more 'const' modifiers to improve error checking
+ and help optimizers.
+ o Finally remove references to RSAref.
+ o Reworked parts of the BIGNUM code.
+ o Support for new engines: Broadcom ubsec, Accelerated Encryption
+ Processing, IBM 4758.
+ o A few new engines added in the demos area.
+ o Extended and corrected OID (object identifier) table.
+ o PRNG: query at more locations for a random device, automatic query for
+ EGD style random sources at several locations.
+ o SSL/TLS: allow optional cipher choice according to server's preference.
+ o SSL/TLS: allow server to explicitly set new session ids.
+ o SSL/TLS: support Kerberos cipher suites (RFC2712).
+ Only supports MIT Kerberos for now.
+ o SSL/TLS: allow more precise control of renegotiations and sessions.
+ o SSL/TLS: add callback to retrieve SSL/TLS messages.
+ o SSL/TLS: support AES cipher suites (RFC3268).
+
+ Major changes between OpenSSL 0.9.6j and OpenSSL 0.9.6k:
+
+ o Security: fix various ASN1 parsing bugs.
+ o SSL/TLS protocol fix for unrequested client certificates.
+
+ Major changes between OpenSSL 0.9.6i and OpenSSL 0.9.6j:
+
+ o Security: counter the Klima-Pokorny-Rosa extension of
+ Bleichbacher's attack
+ o Security: make RSA blinding default.
+ o Build: shared library support fixes.
+
+ Major changes between OpenSSL 0.9.6h and OpenSSL 0.9.6i:
+
+ o Important security related bugfixes.
+
+ Major changes between OpenSSL 0.9.6g and OpenSSL 0.9.6h:
+
+ o New configuration targets for Tandem OSS and A/UX.
+ o New OIDs for Microsoft attributes.
+ o Better handling of SSL session caching.
+ o Better comparison of distinguished names.
+ o Better handling of shared libraries in a mixed GNU/non-GNU environment.
+ o Support assembler code with Borland C.
+ o Fixes for length problems.
+ o Fixes for uninitialised variables.
+ o Fixes for memory leaks, some unusual crashes and some race conditions.
+ o Fixes for smaller building problems.
+ o Updates of manuals, FAQ and other instructive documents.
+
+ Major changes between OpenSSL 0.9.6f and OpenSSL 0.9.6g:
+
+ o Important building fixes on Unix.
+
+ Major changes between OpenSSL 0.9.6e and OpenSSL 0.9.6f:
+
+ o Various important bugfixes.
+
+ Major changes between OpenSSL 0.9.6d and OpenSSL 0.9.6e:
+
+ o Important security related bugfixes.
+ o Various SSL/TLS library bugfixes.
+
+ Major changes between OpenSSL 0.9.6c and OpenSSL 0.9.6d:
+
+ o Various SSL/TLS library bugfixes.
+ o Fix DH parameter generation for 'non-standard' generators.
+
+ Major changes between OpenSSL 0.9.6b and OpenSSL 0.9.6c:
+
+ o Various SSL/TLS library bugfixes.
+ o BIGNUM library fixes.
+ o RSA OAEP and random number generation fixes.
+ o Object identifiers corrected and added.
+ o Add assembler BN routines for IA64.
+ o Add support for OS/390 Unix, UnixWare with gcc, OpenUNIX 8,
+ MIPS Linux; shared library support for Irix, HP-UX.
+ o Add crypto accelerator support for AEP, Baltimore SureWare,
+ Broadcom and Cryptographic Appliance's keyserver
+ [in 0.9.6c-engine release].
+
+ Major changes between OpenSSL 0.9.6a and OpenSSL 0.9.6b:
+
+ o Security fix: PRNG improvements.
+ o Security fix: RSA OAEP check.
+ o Security fix: Reinsert and fix countermeasure to Bleichbacher's
+ attack.
+ o MIPS bug fix in BIGNUM.
+ o Bug fix in "openssl enc".
+ o Bug fix in X.509 printing routine.
+ o Bug fix in DSA verification routine and DSA S/MIME verification.
+ o Bug fix to make PRNG thread-safe.
+ o Bug fix in RAND_file_name().
+ o Bug fix in compatibility mode trust settings.
+ o Bug fix in blowfish EVP.
+ o Increase default size for BIO buffering filter.
+ o Compatibility fixes in some scripts.
+
+ Major changes between OpenSSL 0.9.6 and OpenSSL 0.9.6a:
+
+ o Security fix: change behavior of OpenSSL to avoid using
+ environment variables when running as root.
+ o Security fix: check the result of RSA-CRT to reduce the
+ possibility of deducing the private key from an incorrectly
+ calculated signature.
+ o Security fix: prevent Bleichenbacher's DSA attack.
+ o Security fix: Zero the premaster secret after deriving the
+ master secret in DH ciphersuites.
+ o Reimplement SSL_peek(), which had various problems.
+ o Compatibility fix: the function des_encrypt() renamed to
+ des_encrypt1() to avoid clashes with some Unixen libc.
+ o Bug fixes for Win32, HP/UX and Irix.
+ o Bug fixes in BIGNUM, SSL, PKCS#7, PKCS#12, X.509, CONF and
+ memory checking routines.
+ o Bug fixes for RSA operations in threaded environments.
+ o Bug fixes in misc. openssl applications.
+ o Remove a few potential memory leaks.
+ o Add tighter checks of BIGNUM routines.
+ o Shared library support has been reworked for generality.
+ o More documentation.
+ o New function BN_rand_range().
+ o Add "-rand" option to openssl s_client and s_server.
+
+ Major changes between OpenSSL 0.9.5a and OpenSSL 0.9.6:
+
+ o Some documentation for BIO and SSL libraries.
+ o Enhanced chain verification using key identifiers.
+ o New sign and verify options to 'dgst' application.
+ o Support for DER and PEM encoded messages in 'smime' application.
+ o New 'rsautl' application, low level RSA utility.
+ o MD4 now included.
+ o Bugfix for SSL rollback padding check.
+ o Support for external crypto devices [1].
+ o Enhanced EVP interface.
+
+ [1] The support for external crypto devices is currently a separate
+ distribution. See the file README.ENGINE.
+
+ Major changes between OpenSSL 0.9.5 and OpenSSL 0.9.5a:
+
+ o Bug fixes for Win32, SuSE Linux, NeXTSTEP and FreeBSD 2.2.8
+ o Shared library support for HPUX and Solaris-gcc
+ o Support of Linux/IA64
+ o Assembler support for Mingw32
+ o New 'rand' application
+ o New way to check for existence of algorithms from scripts
+
+ Major changes between OpenSSL 0.9.4 and OpenSSL 0.9.5:
+
+ o S/MIME support in new 'smime' command
+ o Documentation for the OpenSSL command line application
+ o Automation of 'req' application
+ o Fixes to make s_client, s_server work under Windows
+ o Support for multiple fieldnames in SPKACs
+ o New SPKAC command line utilty and associated library functions
+ o Options to allow passwords to be obtained from various sources
+ o New public key PEM format and options to handle it
+ o Many other fixes and enhancements to command line utilities
+ o Usable certificate chain verification
+ o Certificate purpose checking
+ o Certificate trust settings
+ o Support of authority information access extension
+ o Extensions in certificate requests
+ o Simplified X509 name and attribute routines
+ o Initial (incomplete) support for international character sets
+ o New DH_METHOD, DSA_METHOD and enhanced RSA_METHOD
+ o Read only memory BIOs and simplified creation function
+ o TLS/SSL protocol bugfixes: Accept TLS 'client hello' in SSL 3.0
+ record; allow fragmentation and interleaving of handshake and other
+ data
+ o TLS/SSL code now "tolerates" MS SGC
+ o Work around for Netscape client certificate hang bug
+ o RSA_NULL option that removes RSA patent code but keeps other
+ RSA functionality
+ o Memory leak detection now allows applications to add extra information
+ via a per-thread stack
+ o PRNG robustness improved
+ o EGD support
+ o BIGNUM library bug fixes
+ o Faster DSA parameter generation
+ o Enhanced support for Alpha Linux
+ o Experimental MacOS support
+
+ Major changes between OpenSSL 0.9.3 and OpenSSL 0.9.4:
+
+ o Transparent support for PKCS#8 format private keys: these are used
+ by several software packages and are more secure than the standard
+ form
+ o PKCS#5 v2.0 implementation
+ o Password callbacks have a new void * argument for application data
+ o Avoid various memory leaks
+ o New pipe-like BIO that allows using the SSL library when actual I/O
+ must be handled by the application (BIO pair)
+
+ Major changes between OpenSSL 0.9.2b and OpenSSL 0.9.3:
+ o Lots of enhancements and cleanups to the Configuration mechanism
+ o RSA OEAP related fixes
+ o Added `openssl ca -revoke' option for revoking a certificate
+ o Source cleanups: const correctness, type-safe stacks and ASN.1 SETs
+ o Source tree cleanups: removed lots of obsolete files
+ o Thawte SXNet, certificate policies and CRL distribution points
+ extension support
+ o Preliminary (experimental) S/MIME support
+ o Support for ASN.1 UTF8String and VisibleString
+ o Full integration of PKCS#12 code
+ o Sparc assembler bignum implementation, optimized hash functions
+ o Option to disable selected ciphers
+
+ Major changes between OpenSSL 0.9.1c and OpenSSL 0.9.2b:
o Fixed a security hole related to session resumption
o Fixed RSA encryption routines for the p < q case
o "ALL" in cipher lists now means "everything except NULL ciphers"