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98 commits

Author SHA1 Message Date
Dave Rodgman
914347bfa3 Don't explicitly inline mbedtls_mpi_core_clz 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-27 14:20:30 +01:00
Dave Rodgman
3b29364d61 Fix VS2022 build error 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-26 21:53:30 +01:00
Dave Rodgman
2e863ecde9 Remove unnecessary if to save 16 bytes 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-25 17:40:49 +01:00
Dave Rodgman
0f16d560aa Fix documentation 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-24 12:53:45 +01:00
Dave Rodgman
bbf881053d Document undefined case. Clarify test code. 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-21 12:54:40 +01:00
Dave Rodgman
880a6b34c2 Further size optimisation 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-20 11:52:55 +01:00
Dave Rodgman
fe8a8cd100 Size/perf optimisation for mbedtls_mpi_core_clz 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-04-19 17:59:12 +01:00
Minos Galanakis
00bd8925a7 bignum: Removed merge scaffolding. 
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
 2023-04-05 16:13:11 +01:00
Tom Cosgrove
6af26f3838
Tidy up, remove MPI_CORE(), apply the naming convention, and use the new mbedtls_mpi_core_mul() 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2023-03-31 16:16:00 +02:00
Hanno Becker
4ae890bbd0
Extract MPI_CORE(mul) from the prototype 
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2023-03-31 16:10:34 +02:00
Gilles Peskine
449bd8303e Switch to the new code style 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-01-11 14:50:10 +01:00
Gilles Peskine
e162b4725c
Merge pull request #6777 from tom-cosgrove-arm/issue-6292-mod_inv 
Bignum: Implement high level fixed width modular inversion
 2022-12-17 13:26:02 +01:00
Manuel Pégourié-Gonnard
5bf8629b2c
Merge pull request #6303 from gilles-peskine-arm/bignum-core-random 
Bignum: Implement mbedtls_mpi_core_random
 2022-12-16 09:58:07 +01:00
Tom Cosgrove
786848b5c5 Add low-level Montgomery conversion functions to bignum_core 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-12-15 16:56:36 +00:00
Tom Cosgrove
30f3b4d601 Add mbedtls_mpi_core_check_zero_ct() and tests 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-12-15 16:56:36 +00:00
Gilles Peskine
6b7ce968d2 Clarify some comments 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-12-15 15:04:33 +01:00
Manuel Pégourié-Gonnard
a9ac61203b
Merge pull request #6666 from daverodgman/fast_unaligned 
Fast unaligned memory access macros
 2022-12-12 12:18:17 +01:00
Tom Cosgrove
0a0ddedfb7 Have mbedtls_mpi_core_exp_mod() take a temporary instead of allocating memory 
Last PR needed for #6293

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-12-06 14:37:18 +00:00
Tom Cosgrove
ecda186893 Require input to mbedtls_mpi_core_exp_mod() to already be in Montgomery form 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-12-06 10:46:30 +00:00
Gilles Peskine
70375b2028 Move mbedtls_mpi_core_random to the proper source file 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-12-01 23:46:26 +01:00
Gilles Peskine
6f949ea67b New constant-flow function mbedtls_mpi_core_uint_le_mpi 
Compare a single-limb MPI with a multi-limb MPI. This is rather ad hoc, but
will be useful for mbedtls_mpi_core_random.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-12-01 23:06:43 +01:00
Gilles Peskine
edaa17b350
Merge pull request #6547 from yanesca/extract_mod_exp_from_prototype 
Bignum: Extract mod exp from prototype
 2022-11-29 21:40:07 +01:00
Dave Rodgman
6d23ff60dd Make use of optimised bswap from bignum 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2022-11-28 15:41:13 +00:00
Janos Follath
3321b5842c mpi_exp_mod: improve documentation 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
7d89d351e6 Zeroize sensitive data 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
0b270a5603 Explain a little more 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
4380d7b7f3 Simplify cleanup logic 
Take advantage of the fact that there's a single point of failure.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
3b63d09fea Make the main loop's logic clearer 
The loop ends when there are no more bits to process, with one twist: when
that happens, we need to clear the window one last time. Since the window
does not start empty (E_limbs==0 is not supported), the loop always starts
with a non-empty window and some bits to process. So it's correct to move
the window clearing logic to the end of the loop. This lets us exit the loop
when the end of the exponent is reached.

It would be clearer not to do the final window clearing inside the loop, so
we wouldn't need to repeat the loop termination condition (end of exponent
reached) inside the loop. However, this requires duplicating the code to
clear the window. Empirically, this causes a significant code size increase,
even if the window clearing code is placed into a function.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
c718a3ce94 Simplify exponent bit selection 
Use indices instead of mutating data to extract the bits of the exponent.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
d83b5cb504 Local readability improvements 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
0de0a049f1 Move window precomputation into an auxiliary function 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
cf979b0fc1 Define variables closer to their use 
Make variables const where possible.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
7af166b827 Change E closer to where it's used 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:54 +00:00
Gilles Peskine
07f2c69511 More consistent variable names 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-22 21:22:53 +00:00
Janos Follath
0ec6e3f394 mpi_core_mod_exp: improve style and documentation 
No intended change in behaviour.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:53 +00:00
Janos Follath
a77911e5c1 core_exp_mod: improve window selection 
We are looking at the exponent at limb granularity and therefore
exponent bits can't go below 32.

The `mpi_` prefix is also removed as it is better not to have prefix at
all than to have just a partial. (Full prefix would be overly long and
would hurt readability.)

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:53 +00:00
Janos Follath
59cbd1be27 Make mbedtls_mpi_core_ct_uint_table_lookup static 
Now that we have a function that calls
mbedtls_mpi_core_ct_uint_table_lookup(), the compiler won't complain if
we make it static.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:53 +00:00
Janos Follath
bad42c4d0d mpi_core_exp_mod: fix local variable type 
On platforms with size_t different from int, mismatch between size_t and
mpi_uint can cause incorrect results or complaints from the compiler.

Signed-off-by: Janos Follath <janos.follath@arm.com>

mpi_core_exp_mod: Cast local variable explicitly

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:53 +00:00
Janos Follath
b6673f0f19 Add modular exponentiation to bignum core 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-22 21:22:53 +00:00
Tom Cosgrove
f7ff4c9a11 Tidy up, remove MPI_CORE(), and apply the naming convention 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-11-22 14:58:15 +00:00
Hanno Becker
d9b2348d8f Extract MPI_CORE(sub_int) from the prototype 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-11-22 14:58:15 +00:00
Janos Follath
2a8bcf8c6f Add bignum merge scaffolding 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-11-02 17:25:48 +00:00
Gilles Peskine
22cdd0ccd3 Update some internal comments 
The refactoring of fill_random had left some obsolete bits in comments.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-02 16:00:01 +01:00
Gilles Peskine
009d195a56 Move mbedtls_mpi_core_fill_random to the proper .c file 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-02 16:00:01 +01:00
Janos Follath
8904a2db29 mpi_core_ct_uint_table_lookup: style and docs 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-10-31 16:51:56 +00:00
Janos Follath
e50f2f1a8e Add mbedtls_mpi_core_ct_uint_table_lookup 
This will be needed for extracting modular exponentiation from the
prototype. The function signature is kept aligned to the prototype, but
the implementation is new. (The implementation of this function in the
prototype has further optimisations which are out of scope for now.)

The function is not reused in the bignum counterpart as it will become
redundant soon.

This function is meant to be static, but doesn't have the qualifier as
it is not used yet and would cause compiler warnings. The
MBEDTLS_STATIC_TESTABLE macro will be added in a later commit.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-10-31 11:32:55 +00:00
Gilles Peskine
9603daddaa
Merge pull request #6230 from tom-cosgrove-arm/issue-6223-core-add 
Bignum: extract core_add from the prototype
 2022-10-27 11:25:27 +02:00
Tom Cosgrove
af7d44b4d2 Tidy up, remove MPI_CORE(), apply the naming convention, and use the new mbedtls_mpi_core_add() 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-10-25 16:29:58 +01:00
Hanno Becker
c98871339d Extract MPI_CORE(add) from the prototype 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
 2022-10-25 16:29:58 +01:00
Minos Galanakis
a081c51cd3 Renamed mpi_core_get_mont_R2_unsafe_neg -> mpi_core_get_mont_r2_unsafe_neg 
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
 2022-10-25 15:12:38 +01:00