Newer
Older
Ralf S. Engelschall
committed
_______________
This is a high-level summary of the most important changes.
For a full list of changes, see the git commit log; for example,
https://github.com/openssl/openssl/commits/ and pick the appropriate
release branch.
*) Use the new ec_scalar_mul_ladder scaffold to implement a specialized ladder
step for prime curves. The new implementation is based on formulae from
differential addition-and-doubling in homogeneous projective coordinates
from Izu-Takagi "A fast parallel elliptic curve multiplication resistant
against side channel attacks" and Brier-Joye "Weierstrass Elliptic Curves
and Side-Channel Attacks" Eq. (8) for y-coordinate recovery, modified
to work in projective coordinates.
[Billy Bob Brumley, Nicola Tuveri]
Kurt Roeckx
committed
*) Change generating and checking of primes so that the error rate of not
being prime depends on the intended use based on the size of the input.
For larger primes this will result in more rounds of Miller-Rabin.
The maximal error rate for primes with more than 1080 bits is lowered
to 2^-128.
[Kurt Roeckx, Annie Yousar]
*) Increase the number of Miller-Rabin rounds for DSA key generating to 64.
[Kurt Roeckx]
*) The 'tsget' script is renamed to 'tsget.pl', to avoid confusion when
moving between systems, and to avoid confusion when a Windows build is
done with mingw vs with MSVC. For POSIX installs, there's still a
symlink or copy named 'tsget' to avoid that confusion as well.
[Richard Levitte]
*) Revert blinding in ECDSA sign and instead make problematic addition
length-invariant. Switch even to fixed-length Montgomery multiplication.
[Andy Polyakov]
*) Use the new ec_scalar_mul_ladder scaffold to implement a specialized ladder
step for binary curves. The new implementation is based on formulae from
differential addition-and-doubling in mixed Lopez-Dahab projective
coordinates, modified to independently blind the operands.
[Billy Bob Brumley, Sohaib ul Hassan, Nicola Tuveri]
*) Add a scaffold to optionally enhance the Montgomery ladder implementation
for `ec_scalar_mul_ladder` (formerly `ec_mul_consttime`) allowing
EC_METHODs to implement their own specialized "ladder step", to take
advantage of more favorable coordinate systems or more efficient
differential addition-and-doubling algorithms.
[Billy Bob Brumley, Sohaib ul Hassan, Nicola Tuveri]
*) Modified the random device based seed sources to keep the relevant
file descriptors open rather than reopening them on each access.
This allows such sources to operate in a chroot() jail without
the associated device nodes being available. This behaviour can be
controlled using RAND_keep_random_devices_open().
[Paul Dale]
*) Numerous side-channel attack mitigations have been applied. This may have
performance impacts for some algorithms for the benefit of improved
security. Specific changes are noted in this change log by their respective
authors.
[Matt Caswell]
*) AIX shared library support overhaul. Switch to AIX "natural" way of
handling shared libraries, which means collecting shared objects of
different versions and bitnesses in one common archive. This allows to
mitigate conflict between 1.0 and 1.1 side-by-side installations. It
doesn't affect the way 3rd party applications are linked, only how
multi-version installation is managed.
[Andy Polyakov]
*) Make ec_group_do_inverse_ord() more robust and available to other
EC cryptosystems, so that irrespective of BN_FLG_CONSTTIME, SCA
mitigations are applied to the fallback BN_mod_inverse().
When using this function rather than BN_mod_inverse() directly, new
EC cryptosystem implementations are then safer-by-default.
[Billy Bob Brumley]
*) Add coordinate blinding for EC_POINT and implement projective
coordinate blinding for generic prime curves as a countermeasure to
chosen point SCA attacks.
[Sohaib ul Hassan, Nicola Tuveri, Billy Bob Brumley]
*) Add blinding to ECDSA and DSA signatures to protect against side channel
attacks discovered by Keegan Ryan (NCC Group).
*) Enforce checking in the pkeyutl command line app to ensure that the input
length does not exceed the maximum supported digest length when performing
a sign, verify or verifyrecover operation.
[Matt Caswell]
*) SSL_MODE_AUTO_RETRY is enabled by default. Applications that use blocking
I/O in combination with something like select() or poll() will hang. This
can be turned off again using SSL_CTX_clear_mode().
Many applications do not properly handle non-application data records, and
TLS 1.3 sends more of such records. Setting SSL_MODE_AUTO_RETRY works
around the problems in those applications, but can also break some.
It's recommended to read the manpages about SSL_read(), SSL_write(),
SSL_get_error(), SSL_shutdown(), SSL_CTX_set_mode() and
SSL_CTX_set_read_ahead() again.
[Kurt Roeckx]
Richard Levitte
committed
*) When unlocking a pass phrase protected PEM file or PKCS#8 container, we
now allow empty (zero character) pass phrases.
[Richard Levitte]
*) Apply blinding to binary field modular inversion and remove patent
pending (OPENSSL_SUN_GF2M_DIV) BN_GF2m_mod_div implementation.
[Billy Bob Brumley]
*) Deprecate ec2_mult.c and unify scalar multiplication code paths for
binary and prime elliptic curves.
[Billy Bob Brumley]
*) Remove ECDSA nonce padding: EC_POINT_mul is now responsible for
constant time fixed point multiplication.
[Billy Bob Brumley]
*) Revise elliptic curve scalar multiplication with timing attack
defenses: ec_wNAF_mul redirects to a constant time implementation
when computing fixed point and variable point multiplication (which
in OpenSSL are mostly used with secret scalars in keygen, sign,
ECDH derive operations).
[Billy Bob Brumley, Nicola Tuveri, Cesar Pereida García,
Sohaib ul Hassan]
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
*) Updated CONTRIBUTING
[Rich Salz]
*) Updated DRBG / RAND to request nonce and additional low entropy
randomness from the system.
[Matthias St. Pierre]
*) Updated 'openssl rehash' to use OpenSSL consistent default.
[Richard Levitte]
*) Moved the load of the ssl_conf module to libcrypto, which helps
loading engines that libssl uses before libssl is initialised.
[Matt Caswell]
*) Added EVP_PKEY_sign() and EVP_PKEY_verify() for EdDSA
[Matt Caswell]
*) Fixed X509_NAME_ENTRY_set to get multi-valued RDNs right in all cases.
[Ingo Schwarze, Rich Salz]
*) Added output of accepting IP address and port for 'openssl s_server'
[Richard Levitte]
*) Added a new API for TLSv1.3 ciphersuites:
SSL_CTX_set_ciphersuites()
SSL_set_ciphersuites()
[Matt Caswell]
*) Memory allocation failures consistenly add an error to the error
stack.
[Rich Salz]
*) Don't use OPENSSL_ENGINES and OPENSSL_CONF environment values
in libcrypto when run as setuid/setgid.
[Bernd Edlinger]
*) Load any config file by default when libssl is used.
[Matt Caswell]
*) Added new public header file <openssl/rand_drbg.h> and documentation
for the RAND_DRBG API. See manual page RAND_DRBG(7) for an overview.
[Matthias St. Pierre]
*) QNX support removed (cannot find contributors to get their approval
for the license change).
[Rich Salz]
*) TLSv1.3 replay protection for early data has been implemented. See the
SSL_read_early_data() man page for further details.
[Matt Caswell]
*) Separated TLSv1.3 ciphersuite configuration out from TLSv1.2 ciphersuite
configuration. TLSv1.3 ciphersuites are not compatible with TLSv1.2 and
below. Similarly TLSv1.2 ciphersuites are not compatible with TLSv1.3.
In order to avoid issues where legacy TLSv1.2 ciphersuite configuration
would otherwise inadvertently disable all TLSv1.3 ciphersuites the
configuration has been separated out. See the ciphers man page or the
SSL_CTX_set_ciphersuites() man page for more information.
[Matt Caswell]
*) On POSIX (BSD, Linux, ...) systems the ocsp(1) command running
in responder mode now supports the new "-multi" option, which
spawns the specified number of child processes to handle OCSP
requests. The "-timeout" option now also limits the OCSP
responder's patience to wait to receive the full client request
on a newly accepted connection. Child processes are respawned
as needed, and the CA index file is automatically reloaded
when changed. This makes it possible to run the "ocsp" responder
as a long-running service, making the OpenSSL CA somewhat more
feature-complete. In this mode, most diagnostic messages logged
Loading full blame...