nettle-bugs May 2013

nettle-bugs@lists.lysator.liu.se

3 participants
7 discussions

[PATCH 1/5] Don't include OPT_ASM_SOURCES twice in hogweed_PURE_OBJS
by Martin Storsjö 24 Aug '14

24 Aug '14

OPT_ASM_SOURCES is already included via hogweed_OBJS. This avoids build errors about duplicate symbols in the shared library. --- Makefile.in | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile.in b/Makefile.in index 1ec807b..2db76c5 100644 --- a/Makefile.in +++ b/Makefile.in @@ -180,7 +180,7 @@ nettle_OBJS = $(nettle_SOURCES:.c=.$(OBJEXT)) $(LIBOBJS) nettle_PURE_OBJS = $(nettle_OBJS:.$(OBJEXT)=.p$(OBJEXT)) hogweed_OBJS = $(hogweed_SOURCES:.c=.$(OBJEXT)) $(OPT_ASM_SOURCES:.asm=.$(OBJEXT)) -hogweed_PURE_OBJS = $(hogweed_OBJS:.$(OBJEXT)=.p$(OBJEXT)) $(OPT_ASM_SOURCES:.asm=.p$(OBJEXT)) +hogweed_PURE_OBJS = $(hogweed_OBJS:.$(OBJEXT)=.p$(OBJEXT)) libnettle.a: $(nettle_OBJS) -rm -f $@ -- 1.7.9.4

5 29

Release plans
by nisse＠lysator.liu.se 22 Jan '14

22 Jan '14

I have updated the release plans, at http://www.lysator.liu.se/~nisse/nettle/plan.html. I aim to get a release out within a month or two. Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26. Internet email is subject to wholesale government surveillance.

3 26

git.lysator.liu.se temporarily down
by nisse＠lysator.liu.se 30 May '13

30 May '13

The machine git.lysator.liu.se is being upgraded to a more recent debian version. Not sure when it will be operational again (it's maintained on a volunteer basis), but hopefully within a day or two. Possibly the gitorious web interface will be replaced by something different (gitolite, gitlab, ...), since gitorious seems to require quite a bit of work to install. Sorry for the inconvenience. Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26. Internet email is subject to wholesale government surveillance.

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ANNOUNCE: Nettle-2.7.1
by nisse＠lysator.liu.se 29 May '13

29 May '13

I'm happy to annnounce a new version of GNU Nettle, a low-level cryptographics library. The Nettle home page can be found at http://www.lysator.liu.se/~nisse/nettle/. One serious bug has been found in the new ECC code shipped in nettle-2.7. Thanks to Magnus Holmgren for help tracking down this problem. 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. Available at http://ftp.gnu.org/gnu/nettle/nettle-2.7.1.tar.gz ftp://ftp.gnu.org/gnu/nettle/nettle-2.7.1.tar.gz http://www.lysator.liu.se/~nisse/archive/nettle-2.7.1.tar.gz and in the "nettle-2.7-fixes" branch in the git repository, see http://git.lysator.liu.se/nettle/nettle. Happy hacking, /Niels Möller -- Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26. Internet email is subject to wholesale government surveillance.

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arm compilation
by Nikos Mavrogiannopoulos 28 May '13

28 May '13

Hello, Trying to build nettle 2.7 for an arm10 system of mine using its (old) toolchain fails with assembler errors. arm-linux-gcc -Os -I[...] -I. -DHAVE_CONFIG_H -g -O2 -ggdb3 -Wno-pointer-sign -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wpointer-arith -Wbad-function-cast -Wnested-externs -fpic -MT aes-decrypt-internal.o -MD -MP -MF aes-decrypt-internal.o.d -fpic -c aes-decrypt-internal.s aes-decrypt-internal.s: Assembler messages: aes-decrypt-internal.s:81: Error: bad instruction `push {r4,r5,r6,r7,r8,r10,r11,lr}' aes-decrypt-internal.s:87: Error: register or shift expression expected -- `orr r4,r8,lsl#8' aes-decrypt-internal.s:89: Error: register or shift expression expected -- `orr r4,r8,lsl#16' aes-decrypt-internal.s:91: Error: register or shift expression expected -- `orr r4,r8,lsl#24' aes-decrypt-internal.s:93: Error: bad arguments to instruction -- `eor r4,r8' [...] make[2]: *** [aes-decrypt-internal.o] Error 1 $ arm-linux-as -v GNU assembler version 2.16.1 (arm-linux-uclibc) using BFD version 2.16.1 Trying with the latest buildroot another error is issued: arm-buildroot-linux-uclibcgnueabi-as -v GNU assembler version 2.21.1 (arm-buildroot-linux-uclibcgnueabi) using BFD version (GNU Binutils) 2.21.1 arm-buildroot-linux-uclibcgnueabi-gcc -I. -DHAVE_CONFIG_H -pipe -Os -Wno-pointer-sign -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wpointer-arith -Wbad-function-cast -Wnested-externs -fpic -MT aes-encrypt-internal.o -MD -MP -MF aes-encrypt-internal.o.d -fpic -c aes-encrypt-internal.s aes-encrypt-internal.s: Assembler messages: aes-encrypt-internal.s:140: Error: selected processor does not support ARM mode `uxtb r8,r2' aes-encrypt-internal.s:142: Error: selected processor does not support ARM mode `uxtb r8,r3' aes-encrypt-internal.s:144: Error: selected processor does not support ARM mode `uxtb r8,r12' aes-encrypt-internal.s:146: Error: selected processor does not support ARM mode `uxtb r8,r14' Any ideas? regards, Nikos

3 17

Bug in nettle-2.7 ecc code
by nisse＠lysator.liu.se 17 May '13

17 May '13

Testing on the debian build machines revealed a bug in the new ecc code. Curiously enough, causing failures only on 32-bit sparc (see https://buildd.debian.org/status/fetch.php?pkg=nettle&arch=sparc&ver=2.7-2&…), but the bug is not really platform-specific. It turned out that ecc_j_to_a called GMP:s mpn_mul_n (via ecc_modp_mul) with overlapping input and output arguments, which is not supported. The following patch seems to solve the problem: diff --git a/ecc-j-to-a.c b/ecc-j-to-a.c index df8b876..26c1a03 100644 --- a/ecc-j-to-a.c +++ b/ecc-j-to-a.c @@ -46,6 +46,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, #define up (scratch + ecc->size) #define iz2p (scratch + ecc->size) #define iz3p (scratch + 2*ecc->size) +#define izBp (scratch + 3*ecc->size) #define tp scratch mp_limb_t cy; @@ -72,11 +73,11 @@ ecc_j_to_a (const struct ecc_curve *ecc, if (flags & 1) { /* Divide this common factor by B */ - mpn_copyi (iz3p, izp, ecc->size); - mpn_zero (iz3p + ecc->size, ecc->size); - ecc->redc (ecc, iz3p); - - ecc_modp_mul (ecc, iz2p, izp, iz3p); + mpn_copyi (izBp, izp, ecc->size); + mpn_zero (izBp + ecc->size, ecc->size); + ecc->redc (ecc, izBp); + + ecc_modp_mul (ecc, iz2p, izp, izBp); } else ecc_modp_sqr (ecc, iz2p, izp); Thanks to Magnus Holmgren for tracking this down. Note that this bug causes overwrites *within* a properly allocated limb array, which gives incorrect results, but it does not overwrite any pointers or code. I should plan for a bugfix release reasonably soon. Testing with a GMP library compiled with --enable-assert would have revealed the bug earlier. Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26. Internet email is subject to wholesale government surveillance.

1 0

Portable rotates
by nisse＠lysator.liu.se 03 May '13

03 May '13

I'm rewriting the cast128 key schedule, to get rid of false warnings, and avoid lots of conditions, and to separate the rotation and the mask subkeys. Then I noticed a portability problem with the rotation macros, #define ROTL32(n,x) (((x)<<(n)) | ((x)>>(32-(n)))) For n == 0, this will work on most machines, but it's not portable, since x >> 32 gives undefined behaviour according to the C spec (when x is a 32-bit type). (On typical hardware, the result of x >> 32 will be either x or 0, and the rotation macro gives the intended result in either case). In most of nettle, there's no problem, because rotation counts are constant and non-zero. cast128 is an exception, with key-dependent rotation counts, which can well be zero (don't know if that's exercised by the test suite, though). A fix is to redefine the macro as #define ROTL32(n,x) (((x)<<(n)) | ((x)>>((-(n))&31))) It should make no difference when n is constant, but for cast128, this portability fix makes the code almost 20% slower. Apparently, gcc, doens't recognize this as a rotate. I just filed a bug report at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157 Is there any other trick I'm missing, which is portable C but which doesn't slow it down when compiled with gcc? Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26. Internet email is subject to wholesale government surveillance.

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nettle-bugs May 2013