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0727ca41b7
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123 Commits

Author SHA1 Message Date
Hanno Becker
0727ca41b7 Make mpi_read_binary time constant 
This commit modifies mpi_read_binary to always allocate the minimum number of
limbs required to hold the entire buffer provided to the function, regardless of
its content. Previously, leading zero bytes in the input data were detected and
used to reduce memory footprint and time, but this non-constant behavior turned
out to be non-tolerable for the cryptographic applications this function is used
for.
 2017-10-25 16:11:03 +01:00
Manuel Pégourié-Gonnard
ca3ff06cea Merge remote-tracking branch 'hanno/mpi_read_file_underflow_backport-1.3' into mbedtls-1.3 
* hanno/mpi_read_file_underflow_backport-1.3:
  Fix potential stack underflow in mpi_read_file.
 2017-06-08 19:54:29 +02:00
Hanno Becker
8c7698b62a Fix potential stack underflow in mpi_read_file. 
When provided with an empty line, mpi_read_file causes a numeric
underflow resulting in a stack underflow. This commit fixes this and
adds some documentation to mpi_read_file.
 2017-05-12 07:26:01 +01:00
Hanno Becker
1c6339f966 Abort modular inversion when modulus is one. 
The modular inversion function hangs when provided with the modulus
1. This commit refuses this modulus with a BAD_INPUT error code. It
also adds a test for this case.
 2017-05-11 16:02:20 +01:00
Hanno Becker
88bbab22e9 Correct sign in modular exponentiation algorithm. 
The modular exponentiation function  handled the sign
incorrectly. This commit fixes this and a test case which should have
caught it.
 2017-05-11 15:57:15 +01:00
Andres AG
2b2fc115df Fix buffer overflow in mpi_write_string() 
Fix a buffer overflow when writting a string representation of an MPI
number to a buffer in hexadecimal. The problem occurs because hex
digits are written in pairs and this is not accounted for in the
calculation of the required buffer size when the number of digits is
odd.
 2017-03-02 23:01:54 +00:00
Manuel Pégourié-Gonnard
faae6d2019 Fix backporting mistakes in previous 5 commits 2016-01-08 15:24:46 +01:00
Janos Follath
2db440d2f1 Improved on the previous fix and added a test case to cover both types 
of carries.
 2016-01-08 15:22:05 +01:00
Janos Follath
2b806fad7b Removed recursion from fix #309. 2016-01-08 15:20:29 +01:00
Janos Follath
ff5317e99b Improved on the fix of #309 and extended the test to cover subroutines. 2016-01-08 15:19:14 +01:00
Janos Follath
87f1494809 Tests and fix added for #309 (inplace mpi doubling). 2016-01-08 15:18:03 +01:00
Simon Butcher
d7fe6fbd76 Fix for MPI divide on MSVC 
Resolves multiple platform issues when building bignum.c with Microsoft
Visual Studio.
 2016-01-03 22:39:18 +00:00
Simon Butcher
14400c8fb0 Merge memory leak fix into branch 'mbedtls-1.3' 
Merge of fix for memory leak in RSA-SSA signing - #372
 2016-01-02 00:28:19 +00:00
Simon Butcher
e4ed3475b0 Added integer divide by as separate function 
Added 64bit integer divided by 32bit integer, with remainder
 2015-12-22 15:26:57 +00:00
Manuel Pégourié-Gonnard
fa647a75a1 Fix references to non-standard SIZE_T_MAX 
Turns out C99 doesn't define SIZE_T_MAX, so let's not use it.
 2015-10-05 15:29:48 +01:00
Manuel Pégourié-Gonnard
59efb6a1b9 Fix potential buffer overflow in mpi_read_string() 
Found by Guido Vranken.

Two possible integer overflows (during << 2 or addition in BITS_TO_LIMB())
could result in far too few memory to be allocated, then overflowing the
buffer in the subsequent for loop.

Both integer overflows happen when slen is close to or greater than
SIZE_T_MAX >> 2 (ie 2^30 on a 32 bit system).

Note: one could also avoid those overflows by changing BITS_TO_LIMB(s << 2) to
CHARS_TO_LIMB(s >> 1) but the solution implemented looks more robust with
respect to future code changes.
 2015-09-30 16:50:31 +02:00
Manuel Pégourié-Gonnard
770b5e1e9e Fix missing NULL check in MPI 2015-04-29 17:02:01 +02:00
Manuel Pégourié-Gonnard
aac657a1d3 Merge remote-tracking branch 'pj/development' into mbedtls-1.3 
* pj/development:
  Added more constant-time code and removed biases in the prime number generation routines.
 2015-04-15 14:12:59 +02:00
Pascal Junod
b99183dfc6 Added more constant-time code and removed biases in the prime number generation routines. 2015-03-11 16:49:45 +01:00
Manuel Pégourié-Gonnard
fe44643b0e Rename website and repository 2015-03-06 13:17:10 +00:00
Mansour Moufid
c531b4af3c Apply the semantic patch rm-malloc-cast.cocci. 
for dir in library programs; do
        spatch --sp-file scripts/rm-malloc-cast.cocci --dir $dir \
        --in-place;
    done
 2015-02-16 10:43:52 +00:00
Manuel Pégourié-Gonnard
d72704b0d5 Remove work-around for alleged compiler bug 
It turns out the problem was with the way the reporter was invoking its
toolchain, not the toolchain itself.
 2015-02-12 09:38:54 +00:00
Rich Evans
00ab47026b cleanup library and some basic tests. Includes, add guards to includes 2015-02-10 11:28:46 +00:00
Manuel Pégourié-Gonnard
860b51642d Fix url again 2015-01-28 17:12:07 +00:00
Manuel Pégourié-Gonnard
085ab040aa Fix website url to use https. 2015-01-23 11:06:27 +00:00
Manuel Pégourié-Gonnard
9698f5852c Remove maintainer line. 2015-01-23 10:59:00 +00:00
Manuel Pégourié-Gonnard
19f6b5dfaa Remove redundant "all rights reserved" 2015-01-23 10:54:00 +00:00
Manuel Pégourié-Gonnard
a658a4051b Update copyright 2015-01-23 09:55:24 +00:00
Manuel Pégourié-Gonnard
967a2a5f8c Change name to mbed TLS in the copyright notice 2015-01-22 14:28:16 +00:00
Manuel Pégourié-Gonnard
7f4ed67a97 Fix compile error with armcc in mpi_is_prime() 2014-10-15 22:06:46 +02:00
Paul Bakker
6c343d7d9a Fix mpi_write_string() to write "00" as hex output for empty MPI 2014-07-10 15:27:10 +02:00
Paul Bakker
66d5d076f7 Fix formatting in various code to match spacing from coding style 2014-06-17 17:06:47 +02:00
Paul Bakker
db20c10423 Add #endif comments for #endif more than 10 lines from #if / #else 2014-06-17 14:34:44 +02:00
Paul Bakker
d8bb82665e Fix code styling for return statements 2014-06-17 14:06:49 +02:00
Paul Bakker
3461772559 Introduce polarssl_zeroize() instead of memset() for zeroization 2014-06-14 16:46:03 +02:00
Paul Bakker
c37b0ac4b2 Fix typo in bignum.c 2014-05-01 14:19:23 +02:00
Paul Bakker
b9e4e2c97a Fix formatting: fix some 'easy' > 80 length lines 2014-05-01 14:18:25 +02:00
Paul Bakker
9af723cee7 Fix formatting: remove trailing spaces, #endif with comments (> 10 lines) 2014-05-01 13:03:14 +02:00
Paul Bakker
9bb04b6389 Removed redundant code in mpi_fill_random() 2014-05-01 09:47:02 +02:00
Manuel Pégourié-Gonnard
cef4ad2509 Adapt sources to configurable config.h name 2014-04-30 16:40:20 +02:00
Paul Bakker
33dc46b080 Fix bug with mpi_fill_random() on big-endian 2014-04-30 16:20:39 +02:00
Paul Bakker
75a2860f26 Potential memory leak in mpi_exp_mod() when error occurs during 
calculation of RR.
 2014-03-31 12:08:17 +02:00
Manuel Pégourié-Gonnard
2eea29238c Make the compiler work-around more specific 2014-03-14 18:23:26 +01:00
Manuel Pégourié-Gonnard
bb8661e006 Work around a compiler bug on OS X. 2014-03-14 09:21:20 +01:00
Manuel Pégourié-Gonnard
fdf3f0e671 Avoid "unreachable code" warning 2014-03-11 13:47:05 +01:00
Paul Bakker
7dc4c44267 Library files moved to use platform layer 2014-02-06 13:20:16 +01:00
Paul Bakker
c2024f4592 Added MPI_CHK around unguarded mpi calls 2014-01-23 21:00:57 +01:00
Manuel Pégourié-Gonnard
9e987edf9f Fix potential memory leak in bignum selftest 2014-01-22 12:59:04 +01:00
Manuel Pégourié-Gonnard
fd6a191381 Fix misplaced initialisation. 
If one of the calls to mpi_grow() before setting Apos would fail, then
mpi_free( &Apos ) would be executed without Apos being initialised.
 2014-01-22 12:57:04 +01:00
Paul Bakker
6ea1a95ce8 Added missing MPI_CHK() around some statements 2013-12-31 11:17:14 +01:00