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NEWS
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NEWS for the Nettle 3.7.3 release
This is bugfix release, fixing bugs that could make the RSA
decryption functions crash on invalid inputs.
Upgrading to the new version is strongly recommended. For
applications that want to support older versions of Nettle,
the bug can be worked around by adding a check that the RSA
ciphertext is in the range 0 < ciphertext < n, before
attempting to decrypt it.
Thanks to Paul Schaub and Justus Winter for reporting these
problems.
The new version is intended to be fully source and binary
compatible with Nettle-3.6. The shared library names are
libnettle.so.8.4 and libhogweed.so.6.4, with sonames
libnettle.so.8 and libhogweed.so.6.
Bug fixes:
* Fix crash for zero input to rsa_sec_decrypt and
rsa_decrypt_tr. Potential denial of service vector.
* Ensure that all of rsa_decrypt_tr and rsa_sec_decrypt return
failure for out of range inputs, instead of either crashing,
or silently reducing input modulo n. Potential denial of
service vector.
* Ensure that rsa_decrypt returns failure for out of range
inputs, instead of silently reducing input modulo n.
* Ensure that rsa_sec_decrypt returns failure if the message
size is too large for the given key. Unlike the other bugs,
this would typically be triggered by invalid local
configuration, rather than by processing untrusted remote
data.
NEWS for the Nettle 3.7.2 release
This is a bugfix release, fixing a bug in ECDSA signature
verification that could lead to a denial of service attack
(via an assertion failure) or possibly incorrect results. It
also fixes a few related problems where scalars are required
to be canonically reduced modulo the ECC group order, but in
fact may be slightly larger.
Upgrading to the new version is strongly recommended.
Even when no assert is triggered in ecdsa_verify, ECC point
multiplication may get invalid intermediate values as input,
and produce incorrect results. It's trivial to construct
alleged signatures that result in invalid intermediate values.
It appears difficult to construct an alleged signature that
makes the function misbehave in such a way that an invalid
signature is accepted as valid, but such attacks can't be
ruled out without further analysis.
Thanks to Guido Vranken for setting up the fuzzer tests that
uncovered this problem.
The new version is intended to be fully source and binary
compatible with Nettle-3.6. The shared library names are
libnettle.so.8.3 and libhogweed.so.6.3, with sonames
libnettle.so.8 and libhogweed.so.6.
Bug fixes:
* Fixed bug in ecdsa_verify, and added a corresponding test
case.
* Similar fixes to ecc_gostdsa_verify and gostdsa_vko.
* Similar fixes to eddsa signatures. The problem is less severe
for these curves, because (i) the potentially out or range
value is derived from output of a hash function, making it
harder for the attacker to to hit the narrow range of
problematic values, and (ii) the ecc operations are
inherently more robust, and my current understanding is that
unless the corresponding assert is hit, the verify
operation should complete with a correct result.
* Fix to ecdsa_sign, which with a very low probability could
return out of range signature values, which would be
rejected immediately by a verifier.
NEWS for the Nettle 3.7.1 release
This is primarily a bug fix release, fixing a couple of
problems found in Nettle-3.7.
The new version is intended to be fully source and binary
compatible with Nettle-3.6. The shared library names are
libnettle.so.8.2 and libhogweed.so.6.2, with sonames
libnettle.so.8 and libhogweed.so.6.
Bug fixes:
* Fix bug in chacha counter update logic. The problem affected
ppc64 and ppc64el, with the new altivec assembly code
enabled. Reported by Andreas Metzler, after breakage in
GnuTLS tests on ppc64.
* Support for big-endian ARM platforms has been restored.
Fixes contributed by Michael Weiser.
* Fix build problem on OpenBSD/powerpc64, reported by Jasper
Lievisse Adriaanse.
* Fix corner case bug in ECDSA verify, it would produce
incorrect result in the unlikely case of an all-zero
message hash. Reported by Guido Vranken.
New features:
* Support for pbkdf2_hmac_sha384 and pbkdf2_hmac_sha512,
contributed by Nicolas Mora.
Miscellaneous:
* Poorly performing ARM Neon code for doing single-block
Salsa20 and Chacha has been deleted. The code to do two or
three blocks in parallel, introduced in Nettle-3.7, is
unchanged.
NEWS for the Nettle 3.7 release
This release adds one new feature, the bcrypt password hashing
function, and lots of optimizations. There's also one
important change to how Nettle is configured: Fat builds are
now on by default.
The release adds PowerPC64 assembly for a few algorithms,
resulting in great speedups. Benchmarked on a Power9 machine,
speedup was 13 times for AES256-CTR and AES256-GCM, and 3.5
times for Chacha. For fat builds (now the default), the new
code is used automatically, on processors supporting the needed
instruction set extensions.
The new version is intended to be fully source and binary
compatible with Nettle-3.6. The shared library names are
libnettle.so.8.1 and libhogweed.so.6.1, with sonames
libnettle.so.8 and libhogweed.so.6.
New features:
* Support for bcrypt, contributed by Stephen R. van den Berg.
Optimizations:
* Much faster AES and GCM on PowerPC64 processors supporting
the corresponding crypto extensions. Contributed by Mamone
Tarsha.
* Speed of Chacha improved on PowerPC64, x86_64 and ARM Neon.
* Speed of Salsa20 improved on x86_64 and ARM Neon.
* Overhaul of some elliptic curve primitives, improving ECDSA
signature speed.
Configure:
* Fat builds are enabled by default on the architectures where
it is supported (x86_64, arm and powerpc64). To disable
runtime selection, and instead specify the processor flavor
at configure time, you need to pass --disable-fat to the
configure script.
Known issues:
* The ARM assembly code in this release doesn't work correctly
on big-endian ARM systems. This will hopefully be fixed in a
later release.
Miscellaneous:
* Use a few more gmp-6.1 functions: mpn_cnd_add_n,
mpn_cnd_sub_n, mpn_cnd_swap. Delete corresponding internal
Nettle functions.
* Convert all assembly files to use the default m4 quote
characters.
NEWS for the Nettle 3.6 release
This release adds a couple of new features, most notable being
support for ED448 signatures.
It is not binary compatible with earlier releases. The shared
library names are libnettle.so.8.0 and libhogweed.so.6.0, with
sonames libnettle.so.8 and libhogweed.so.6. The changed
sonames are mainly to avoid upgrade problems with recent
GnuTLS versions, that depend on Nettle internals outside of
the advertised ABI. But also because of the removal of
internal poly1305 functions which were undocumented but
declared in an installed header file, see Interface changes
below.
New features:
* Support for Curve448 and ED448 signatures. Contributed by
Daiki Ueno.
* Support for SHAKE256 (SHA3 variant with arbitrary output
size). Contributed by Daiki Ueno.
* Support for SIV-CMAC (Synthetic Initialization Vector) mode,
contributed by Nikos Mavrogiannopoulos.
* Support for CMAC64, contributed by Dmitry Baryshkov.
* Support for the "CryptoPro" variant of the GOST hash
function, as gosthash94cp. Contributed by Dmitry Baryshkov.
* Support for GOST DSA signatures, including GOST curves
gc256b and gc512a. Contributed by Dmitry Baryshkov.
* Support for Intel CET in x86 and x86_64 assembly files, if
enabled via CFLAGS (gcc --fcf-protection=full). Contributed
by H.J. Lu and Simo Sorce.
* A few new functions to improve support for the Chacha
variant with 96-bit nonce and 32-bit block counter (the
existing functions use nonce and counter of 64-bit each),
and functions to set the counter. Contributed by Daiki Ueno.
* New interface, struct nettle_mac, for MAC (message
authentication code) algorithms. This abstraction is only
for MACs that don't require a per-message nonce. For HMAC,
the key size is fixed, and equal the digest size of the
underlying hash function.
Bug fixes:
* Fix bug in cfb8_decrypt. Previously, the IV was not updated
correctly in the case of input data shorter than the block
size. Reported by Stephan Mueller, fixed by Daiki Ueno.
* Fix configure check for __builtin_bswap64, the incorrect
check would result in link errors on platforms missing this
function. Patch contributed by George Koehler.
* All use of old-fashioned suffix rules in the Makefiles have
been replaced with %-pattern rules. Nettle's use of suffix
rules in earlier versions depended on undocumented GNU make
behavior, which is being deprecated in GNU make 4.3.
Building with other make programs than GNU make is untested
and unsupported. (Building with BSD make or Solaris make
used to work years ago, but has not been tested recently).
Interface changes:
* Declarations of internal poly1305.h functions have been
removed from the header file poly1305.h, to make it clear
that they are not part of the advertised API or ABI.
Miscellaneous:
* Building the public key support of nettle now requires GMP
version 6.1.0 or later (unless --enable-mini-gmp is used).
* A fair amount of changes to ECC internals, with a few
deleted and a few new fields in the internal struct
ecc_curve. Files and functions have been renamed to more
consistently match the curve name, e.g., ecc-256.c has been
renamed to ecc-secp256r1.c.
* Documentation for chacha-poly1305 updated. It is no longer
experimental. The implementation was updated to follow RFC
8439 in Nettle-3.1, but that was not documented or announced
at the time.
NEWS for the Nettle 3.5.1 release
The Nettle-3.5.1 corrects a packaging mistake in Nettle-3.5.
The new directory x86_64/sha_ni were missing in the tar file,
breaking x86_64 builds with --enable-fat, and producing worse
performance than promised for builds with --enable-x86-sha-ni.
Also a few unused in-progress assembly files were accidentally
included in the tar file.
These problems are corrected in Nettle-3.5.1. There are no
other changes, and also the library version numbers are
unchanged.
NEWS for the Nettle 3.5 release
This release adds a couple of new features and optimizations,
and deletes or deprecates a few obsolete features. It is *not*
binary (ABI) compatible with earlier versions. Except for
deprecations listed below, it is intended to be fully
source-level (API) compatible with Nettle-3.4.1.
The shared library names are libnettle.so.7.0 and
libhogweed.so.5.0, with sonames libnettle.so.7 and
libhogweed.so.5.
Changes in behavior:
* Nettle's gcm_crypt will now call the underlying block cipher
to process more than one block at a time. This is not a
change to the documented behavior, but unfortunately breaks
assumptions accidentally made in GnuTLS, up to and including
version 3.6.1.
New features:
* Support for CFB8 (Cipher Feedback Mode, processing a single
octet per block cipher operation), contributed by Dmitry
Eremin-Solenikov.
* Support for CMAC (RFC 4493), contributed by Nikos
Mavrogiannopoulos.
* Support for XTS mode, contributed by Simo Sorce.
Optimizations:
* Improved performance of the x86_64 AES implementation using
the aesni instructions. Gives a large speedup for operations
processing multiple blocks at a time (including CTR mode,
GCM mode, and CBC decrypt, but *not* CBC encrypt).
* Improved performance for CTR mode, for the common case of
16-byte block size. Pass more data at a time to underlying
block cipher, and fill the counter blocks more efficiently.
Extension to also handle GCM mode efficiently contributed
by Nikos Mavrogiannopoulos.
* New x86_64 implementation of sha1 and sha256, for processors
supporting the sha_ni instructions. Speedup of 3-5 times on
affected processors.
* Improved parameters for the precomputation of tables used
for ecc signatures. Roughly 10%-15% speedup of the ecdsa
sign operation using the secp_256r1, secp_384r1 and
secp_521r1 curves, and 25% speedup of ed25519 sign
operation, benchmarked on x86_64. Table sizes unchanged,
around 16 KB per curve.
* In ARM fat builds, automatically select Neon implementation
of Chacha, where possible. Contributed by Yuriy M.
Kaminskiy.
Deleted features:
* The header file des-compat.h and everything declared therein
has been deleted, as announced earlier. This file provided a
subset of the old libdes/ssleay/openssl interface for DES
and triple-DES. DES is still supported, via the functions
declared in des.h.
* Functions using the old struct aes_ctx have been marked as
deprecated. Use the fixed key size interface instead, e.g.,
struct aes256_ctx, introduced in Nettle-3.0.
* The header file nettle-stdint.h, and corresponding autoconf
tests, have been deleted. Nettle now requires that the
compiler/libc provides <stdint.h>.
Miscellaneous:
* Support for big-endian ARM systems, contributed by Michael
Weiser.
* The programs aesdata, desdata, twofishdata, shadata and
gcmdata are no longer built by default. Makefile
improvements contributed by Jay Foad.
* The "example" program examples/eratosthenes.c has been
deleted.
* The contents of hash context structs, and the deprecated
aes_ctx struct, have been reorganized, to enable later
optimizations.
The shared library names are libnettle.so.7.0 and
libhogweed.so.5.0.
NEWS for the Nettle 3.4.1 release
This release fixes a few bugs, and makes the RSA private key
operations side channel silent. The RSA improvements are
contributed by Simo Sorce and Red Hat, and include one new
public function, rsa_sec_decrypt, see below.
All functions using RSA private keys are now side-channel
silent, meaning that they try hard to avoid any branches or
memory accesses depending on secret data. This applies both to
the bignum calculations, which now use GMP's mpn_sec_* family
of functions, and the processing of PKCS#1 padding needed for
RSA decryption.
Nettle's ECC functions were already side-channel silent, while
the DSA functions still aren't. There's also one caveat
regarding the improved RSA functions: due to small table
lookups in relevant mpn_sec_* functions in GMP-6.1.2, the
lowest and highest few bits of the secret factors p and q may
still leak. I'm not aware of any attacks on RSA where knowing
a few bits of the factors makes a significant difference. This
leak will likely be plugged in later GMP versions.
Changes in behavior:
* The functions rsa_decrypt and rsa_decrypt_tr may now clobber
all of the provided message buffer, independent of the
actual message length. They are side-channel silent, in that
branches and memory accesses don't depend on the validity or
length of the message. Side-channel leakage from the
caller's use of length and return value may still provide an
oracle useable for a Bleichenbacher-style chosen ciphertext
attack. Which is why the new function rsa_sec_decrypt is
recommended.
New features:
* A new function rsa_sec_decrypt. It differs from
rsa_decrypt_tr in that the length of the decrypted message
is given a priori, and PKCS#1 padding indicating a different
length is treated as an error. For applications that may be
subject to chosen ciphertext attacks, it is recommended to
initialize the message area with random data, call this
function, and ignore the return value. This applies in
particular to RSA-based key exchange in the TLS protocol.
Bug fixes:
* Fix bug in pkcs1-conv, missing break statements in the
parsing of PEM input files.
* Fix link error on the pss-mgf1-test test, affecting builds
without public key support.
Performance regression:
* All RSA private key operations employing RSA blinding, i.e.,
rsa_decrypt_tr, rsa_*_sign_tr, the new rsa_sec_decrypt, and
rsa_compute_root_tr, are significantly slower. This is
because (i) RSA blinding now use side-channel silent
operations, (ii) blinding includes a modular inversion, and
(iii) side-channel silent modular inversion, implemented as
mpn_sec_invert, is very expensive. A 60% slowdown for
2048-bit RSA keys have been measured.
Miscellaneous:
* Building the public key support of nettle now requires GMP
version 6.0 or later (unless --enable-mini-gmp is used).
The shared library names are libnettle.so.6.5 and
libhogweed.so.4.5, with sonames still libnettle.so.6 and
libhogweed.so.4. It is intended to be fully binary compatible
with nettle-3.1.
NEWS for the Nettle 3.4 release
This release fixes bugs and adds a few new features. It also
addresses an ABI compatibility issue affecting Nettle-3.1 and
later, see below.
Bug fixes:
* Fixed an improper use of GMP mpn_mul, breaking curve2559 and
eddsa on certain platforms. Reported by Sergei Trofimovich.
* Fixed memory leak when handling invalid signatures in
ecdsa_verify. Fix contributed by Nikos Mavrogiannopoulos.
* Fix compilation error with --enable-fat om ARM. Fix
contributed by Andreas Schneider.
* Reorganized the way certain data items are made available.
Short version: Nettle header files now define the symbols
nettle_hashes, nettle_ciphers, and nettle_aeads, as
preprocessor macros invoking a corresponding accessor
function. For backwards ABI compatibility, the symbols are
still present in the compiled libraries, and with the same
sizes as in nettle-3.3.
New features:
* Support for RSA-PSS signatures, contributed by Daiki Ueno.
* Support for the HKDF key derivation function, defined by RFC
5869. Contributed by Nikos Mavrogiannopoulos.
* Support for the Cipher Feedback Mode (CFB), contributed by
Dmitry Eremin-Solenikov.
* New accessor functions: nettle_get_hashes,
nettle_get_ciphers, nettle_get_aeads, nettle_get_secp_192r1,
nettle_get_secp_224r1, nettle_get_secp_256r1,
nettle_get_secp_384r1, nettle_get_secp_521r1.
For source-level compatibility with future versions,
applications are encouraged to migrate to using these
functions instead of referring to the corresponding data
items directly.
Miscellaneous:
* The base16 and base64 functions now use the type char * for
ascii data, rather than uint8_t *. This eliminates the last
pointer-signedness warnings when building Nettle. This is a
minor API change, and applications may need to be adjusted,
but the ABI is unaffected on all platforms I'm aware of.
* The contents of the header file nettle/version.h is now
architecture independent, except in --enable-mini-gmp
configurations.
ABI issue:
Since the breakage was a bit subtle, let me document it
here. The nettle and hogweed libraries export a couple of
data symbols, and for some of these, the size was never
intended to be part of the ABI. E.g.,
extern const struct nettle_hash * const nettle_hashes[];
which is an NULL-terminated array.
It turns out the sizes nevertheless may leak into the ABI, and
that increasing the sizes can break old executables linked
with a newer version of the library.
When linking a classic non-PIE executable with a shared
library, we get ELF relocations of type R_X86_64_COPY for
references to data items. These mean that the linker allocates
space for the data item in the data segment of executable, at
a fixed address determined at link-time, and with size
extracted from the version of the .so-file seen when linking.
At load time, the run time linker then copies the contents of
the symbol from the .so file to that location, and uses the
copy instead of the version loaded with the .so-file. And if
the data item in the .so file used at load time is larger than
the data item seen at link time, it is silently truncated in
the process.
So when SHA3 hashes were was added to the nettle_hashes array
in the nettle-3.3 release, this way of linking produces a
truncated array at load time, no longer NULL-terminated.
We will get similar problems for planned extensions of the
internal struct ecc_curve, and exported data items like
extern const struct ecc_curve nettle_secp_256r1;
where the ecc_curve struct is only forward declared in the
public headers. To prepare, applications should migrate to
using the new function nettle_get_secp_256r1, and similarly
for the other curves.
In some future version, the plan is to add a leading
underscore to the name of the actual data items. E.g.,
nettle_hashes --> _nettle_hashes, breaking the ABI, while
keeping the nettle_get_hashes function and the nettle_hashes
macro as the supported ways to access it. We will also
rename nettle_secp_256r1 --> _nettle_secp_256r1, breaking
both ABI and API.
Note that data items like nettle_sha256 are *not* affected,
since the size and layout of this struct is considered part
of the ABI, and R_X86_64_COPY-relocations then work fine.
The shared library names are libnettle.so.6.4 and
libhogweed.so.4.4, with sonames still libnettle.so.6 and
libhogweed.so.4. It is intended to be fully binary compatible
with nettle-3.1.
NEWS for the Nettle 3.3 release
This release fixes a couple of bugs, and improves resistance
to side-channel attacks on RSA and DSA private key operations.
Changes in behavior:
* Invalid private RSA keys, with an even modulo, are now
rejected by rsa_private_key_prepare. (Earlier versions
allowed such keys, even if results of using them were bogus).
Nettle applications are required to call
rsa_private_key_prepare and check the return value, before
using any other RSA private key functions; failing to do so
may result in crashes for invalid private keys. As a
workaround for versions of Gnutls which don't use
rsa_private_key_prepare, additional checks for even moduli
are added to the rsa_*_tr functions which are used by all
recent versions of Gnutls.
* Ignore bit 255 of the x coordinate of the input point to
curve25519_mul, as required by RFC 7748. To differentiate at
compile time, curve25519.h defines the constant
NETTLE_CURVE25519_RFC7748.
Security:
* RSA and DSA now use side-channel silent modular
exponentiation, to defend against attacks on the private key
from evil processes sharing the same processor cache. This
attack scenario is of particular relevance when running an
HTTPS server on a virtual machine, where you don't know who
you share the cache hardware with.
(Private key operations on elliptic curves were already
side-channel silent).
Bug fixes:
* Fix sexp-conv crashes on invalid input. Reported by Hanno
Böck.
* Fix out-of-bounds read in des_weak_p. Fixed by Nikos
Mavrogiannopoulos.
* Fix a couple of formally undefined shift operations,
reported by Nikos Mavrogiannopoulos.
* Fix compilation with c89. Reported by Henrik Grubbström.
New features:
* New function memeql_sec, for side-channel silent comparison
of two memory areas.
Miscellaneous:
* Building the public key support of nettle now requires GMP
version 5.0 or later (unless --enable-mini-gmp is used).
* Filenames of windows DLL libraries now include major number
only. So the dll names change at the same time as the
corresponding soname on ELF platforms. Fixed by Nikos
Mavrogiannopoulos.
* Eliminate most pointer-signedness warnings. In the process,
the strings representing expression type for sexp_interator
functions were changed from const uint8_t * to const char *.
These functions are undocumented, and it doesn't change the
ABI on any platform I'm aware of.
The shared library names are libnettle.so.6.3 and
libhogweed.so.4.3, with sonames still libnettle.so.6 and
libhogweed.so.4. It is intended to be fully binary compatible
with nettle-3.1.
NEWS for the Nettle 3.2 release
Bug fixes:
* The SHA3 implementation is updated according to the FIPS 202
standard. It is not interoperable with earlier versions of
Nettle. Thanks to Nikos Mavrogiannopoulos. To easily
differentiate at compile time, sha3.h defines the constant
NETTLE_SHA3_FIPS202.
* Fix corner-case carry propagation bugs affecting elliptic
curve operations on the curves secp_256r1 and secp_384r1 on
certain platforms, including x86_64. Reported by Hanno Böck.
New features:
* New functions for RSA private key operations, identified by
the "_tr" suffix, with better resistance to side channel
attacks and to hardware or software failures which could
break the CRT optimization. See the Nettle manual for
details. Initial patch by Nikos Mavrogiannopoulos.
* New functions nettle_version_major, nettle_version_minor, as
a run-time variant of the compile-time constants
NETTLE_VERSION_MAJOR and NETTLE_VERSION_MINOR.
Optimizations:
* New ARM Neon implementation of the chacha stream cipher.
Miscellaneous:
* ABI detection on mips, with improved default libdir
location. Contributed by Klaus Ziegler.
* Fixes for ARM assembly syntax, to work better with the clang
assembler. Thanks to Jukka Ukkonen.
* Disabled use of ifunc relocations for fat builds, to fix
problems most easily triggered by using dlopen RTLD_NOW.
The shared library names are libnettle.so.6.2 and
libhogweed.so.4.2, with sonames still libnettle.so.6 and
libhogweed.so.4. It is intended to be fully binary compatible
with nettle-3.1.
NEWS for the Nettle 3.1.1 release
This release fixes a couple of non-critical bugs.
Bug fixes:
* By accident, nettle-3.1 disabled the assembly code for the
secp_224r1 and secp_521r1 elliptic curves on all x86_64
configurations, making signature operations on those curves
10%-30% slower. This code is now re-enabled.
* The x86_64 assembly implementation of gcm hashing has been
fixed to work with the Sun/Oracle assembler.
The shared library names are libnettle.so.6.1 and
libhogweed.so.4.1, with sonames still libnettle.so.6 and
libhogweed.so.4. It is intended to be fully binary compatible
with nettle-3.1.
NEWS for the Nettle 3.1 release
This release adds a couple of new features.
The library is mostly source-level compatible with nettle-3.0.
It is however not binary compatible, due to the introduction
of versioned symbols, and extensions to the base64 context
structs. The shared library names are libnettle.so.6.0 and
libhogweed.so.4.0, with sonames libnettle.so.6 and
libhogweed.so.4.
Bug fixes:
* Fixed a missing include of <limits.h>, which made the
camellia implementation fail on all 64-bit non-x86
platforms.
* Eliminate out-of-bounds reads in the C implementation of
memxor (related to valgrind's --partial-loads-ok flag).
Interface changes:
* Declarations of many internal functions are moved from ecc.h
to ecc-internal.h. The functions are undocumented, and
luckily they're apparently also unused by applications, so I
don't expect any problems from this change.
New features:
* Support for curve25519 and for EdDSA25519 signatures.
* Support for "fat builds" on x86_64 and arm, where the
implementation of certain functions is selected at run-time
depending on available cpu features. Configure with
--enable-fat to try this out. If it turns out to work well
enough, it will likely be enabled by default in later
releases.
* Support for building the hogweed library (public key
support) using "mini-gmp", a small but slower implementation
of a subset of the GMP interfaces. Note that builds using
mini-gmp are *not* binary compatible with regular builds,
and more likely to leak side-channel information.
One intended use-case is for small embedded applications
which need to verify digital signatures.
* The shared libraries are now built with versioned symbols.
Should reduce problems in case a program links explicitly to
nettle and/or hogweed, and to gnutls, and the program and
gnutls expect different versions.
* Support for "URL-safe" base64 encoding and decoding, as
specified in RFC 4648. Contributed by Amos Jeffries.
Optimizations:
* New x86_64 implementation of AES, using the "aesni"
instructions. Autodetected in fat builds. In non-fat builds,
it has to be enabled explicitly with --enable-x86-aesni.
Build system:
* Use the same object files for both static and shared
libraries. This eliminates the *.po object files which were
confusing to some tools (as well as humans). Like before,
PIC code is used by default; to build a non-pic static
library, configure with --disable-pic --disable-shared.
Miscellaneous:
* Made type-checking hack in CBC_ENCRYPT and similar macros
stricter, to generate warnings if they are used with
functions which have a length argument smaller than size_t.
NEWS for the Nettle 3.0 release
This is a major release, including several interface changes,
and new features, some of which are a bit experimental.
Feedback is highly appreciated.
It is *not* binary (ABI) compatible with earlier versions. It
is mostly source-level (API) compatible, with a couple of
incompatibilities noted below. The shared library names are
libnettle.so.5.0 and libhogweed.so.3.0, with sonames
libnettle.so.5 and libhogweed.so.3.
There may be some problems in the new interfaces and new
features which really need incompatible fixes. It is likely
that there will be an update in the form of a 3.1 release in
the not too distant future, with small but incompatible
changes, and if that happens, bugfix-only releases 3.0.x are
unlikely. Users and applications which desire better API and
ABI stability are advised to stay with nettle-2.7.x (latest
version is now 2.7.1) until the dust settles.
Interface changes:
* For the many _set_key functions, it is now consider the
normal case to have a fixed key size, with no key_size
arguments. _set_key functions with a length parameter are
provided only for algorithms with a truly variable keysize,
and where it makes sense for backwards compatibility.
INCOMPATIBLE CHANGE: cast128_set_key no longer accepts a key
size argument. The old function is available under a new
name, cast5_set_key.
INCOMPATIBLE CHANGE: The function typedef
nettle_set_key_func no longer accepts a key size argument.
In particular, this affects users of struct nettle_cipher.
* The nettle_cipher abstraction (in nettle-meta.h) is
restricted to block ciphers only. The encrypt and decrypt
functions now take a const argument for the context.
INCOMPATIBLE CHANGE: nettle_arcfour, i.e., the nettle_cipher
abstraction for the arcfour stream cipher, is deleted.
INCOMPATIBLE CHANGE: New type, nettle_cipher_func, for the
encrypt and decrypt fields of struct nettle_cipher.
* New DSA interface, with a separate struct dsa_param to
represent the underlying group, and generalized dsa_sign and
dsa_verify functions which don't care about the hash
function used. Limited backwards compatibility provided in
dsa-compat.h.
INCOMPATIBLE CHANGE: Declarations of the old interface,
e.g., struct dsa_public_key, dsa_sha1_sign, etc, is moved to
dsa-compat.h.
INCOMPATIBLE CHANGE: The various key conversion functions,
e.g., dsa_keypair_to_sexp, all use the new DSA interface, with
no backwards compatible functions.
INCOMPATIBLE CHANGE: dsa_generate_keypair also uses the new
interface. dsa-compat.h declares a function
dsa_compat_generate_keypair, implementing the old
interface, and #defines dsa_generate_keypair to refer to
this backwards compatible function.
* New AES and Camellia interfaces. There are now separate
context structs for each key size, e.g., aes128_ctx and
camellia256_ctx, and corresponding new functions. The old
interface, with struct aes_ctx and struct camellia_ctx, is
kept for backwards compatibility, but might be removed in
later versions.
* The type of most length arguments is changed from unsigned
to size_t. The memxor functions have their pointer arguments
changed from uint8_t * to void *, for consistency with
related libc functions.
* For hash functions, the constants *_DATA_SIZE have been
renamed to *_BLOCK_SIZE. Old names kept for backwards
compatibility.
Removed features:
* The nettle_next_prime function has been deleted.
Applications should use GMP's mpz_nextprime instead.
* Deleted the RSAREF compatibility, including the header file
rsa-compat.h and everything declared therein.
* Also under consideration for removal is des-compat.h and
everything declared therein. This implements a subset of the
old libdes/ssleay/openssl interface for DES and triple-DES,
and it is poorly tested. If anyone uses this interface,
please speak up! Otherwise, it will likely be removed in the
next release.
Bug fixes:
* Building with ./configure --disable-static now works.
* Use GMP's allocation functions for temporary storage related
to bignums, to avoid potentially large stack allocations.
* Fixes for shared libraries on M$ Windows.
New features:
* Support for Poly1305-AES MAC.
* Support for the ChaCha stream cipher and EXPERIMENTAL
support for the ChaCha-Poly1305 AEAD mode. Specifications
are still in flux, and future releases may do incompatible
changes to track standardization. Currently uses 256-bit key
and 64-bit nonce.
* Support for EAX mode.
* Support for CCM mode. Contributed by Owen Kirby.
* Additional variants of SHA512 with output size of 224 and
256 bits. Contributed by Joachim Strömbergson.
* New interface, struct nettle_aead, for mechanisms providing
authenticated encryption with associated data (AEAD).
* DSA: Support a wider range for the size of q and a wider
range for the digest size.
Optimizations:
* New x86_64 assembly for GCM and MD5. Modest speedups on the
order of 10%-20%.
Miscellaneous:
* SHA3 is now documented as EXPERIMENTAL. Nettle currently
implements SHA3 as specified at the time Keccak won the SHA3
competition. However, the final standard specified by NIST
is likely to be incompatible, in which case future releases
may do incompatible changes to track standardization.
* The portability fix for the rotation macros, mentioned in
NEWS for 2.7.1, actually didn't make it into that release.
It is included now.
* cast128_set_key rewritten for clarity, also eliminating a
couple of compiler warnings.
* New command line tool nettle-pbkdf2.
NEWS for the 2.7.1 release
This is a bugfix release.
Bug fixes:
* Fixed a bug in the new ECC code. The ecc_j_to_a function
called GMP:s mpn_mul_n (via ecc_modp_mul) with overlapping
input and output arguments, which is not supported.
* The assembly files for SHA1, SHA256 and AES depend on ARMv6
instructions, breaking nettle-2.7 for pre-v6 ARM processors.
The configure script now enables those assembly files only
when building for ARMv6 or later.
* Use a more portable C expression for rotations. The
previous version used the following "standard" expression
for 32-bit rotation:
(x << n) | (x >> (32 - n))
But this gives undefined behavior (according to the C
specification) for n = 0. The rotate expression is replaced
by the more portable:
(x << n) | (x >> ((-n)&31))
This change affects only CAST128, which uses non-constant
rotation counts. Unfortunately, the new expression is poorly
optimized by released versions of gcc, making CAST128 a bit
slower. This is being fixed by the gcc hackers, see
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157.
The following problems have been reported, but are *not* fixed
in this release:
* ARM assembly files use instruction syntax which is not
supported by all assemblers. Workaround: Use a current
version of GNU as, or configure with --disable-assembler.
* Configuring with --disable-static doesn't work on windows.
The libraries are intended to be binary compatible with
nettle-2.2 and later. The shared library names are
libnettle.so.4.7 and libhogweed.so.2.5, with sonames still
libnettle.so.4 and libhogweed.so.2.
NEWS for the 2.7 release
This release includes an implementation of elliptic curve
cryptography (ECC) and optimizations for the ARM architecture.
This work was done at the offices of South Pole AB, and
generously funded by the .SE Internet Fund.
Bug fixes:
* Fixed a bug in the buffer handling for incremental SHA3
hashing, with a possible buffer overflow. Patch by Edgar