+ Major changes between OpenSSL 1.0.2f and OpenSSL 1.1.0 [in pre-release]
+
+ o Support for ChaCha20 and Poly1305 added to libcrypto and libssl
+ o Support for extended master secret
+ o CCM ciphersuites
+ o Reworked test suite, now based on perl, Test::Harness and Test::More
+ o Various libcrypto structures made opaque including: BIGNUM, EVP_MD,
+ EVP_MD_CTX, HMAC_CTX, EVP_CIPHER and EVP_CIPHER_CTX.
+ o libssl internal structures made opaque
+ o SSLv2 support removed
+ o Kerberos ciphersuite support removed
+ o RC4 removed from DEFAULT ciphersuites in libssl
+ o 40 and 56 bit cipher support removed from libssl
+ o All public header files moved to include/openssl, no more symlinking
+ o SSL/TLS state machine, version negotiation and record layer rewritten
+ o EC revision: now operations use new EC_KEY_METHOD.
+ o Support for OCB mode added to libcrypto
+ o Support for asynchronous crypto operations added to libcrypto and libssl
+ o Deprecated interfaces can now be disabled at build time either
+ relative to the latest release via the "no-deprecated" Configure
+ argument, or via the "--api=1.1.0|1.0.0|0.9.8" option.
+ o Application software can be compiled with -DOPENSSL_API_COMPAT=version
+ to ensure that features deprecated in that version are not exposed.
+ o Support for RFC6698/RFC7671 DANE TLSA peer authentication
+ o Change of Configure to use --prefix as the main installation
+ directory location rather than --openssldir. The latter becomes
+ the directory for certs, private key and openssl.cnf exclusively.
+ o Reworked BIO networking library, with full support for IPv6.
+
+ Major changes between OpenSSL 1.0.2e and OpenSSL 1.0.2f [28 Jan 2016]
+
+ o DH small subgroups (CVE-2016-0701)
+ o SSLv2 doesn't block disabled ciphers (CVE-2015-3197)