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Commit Graph

45 Commits

Author SHA1 Message Date
Dave Rodgman
c9ed5dee69 Add aarch64 const-time asm 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-11 08:47:38 +01:00
Dave Rodgman
48fb8a3448 Fix some renames that were missed 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 14:01:51 +01:00
Dave Rodgman
b364a22adf Fix mbedtls_ct_size_if_else_0 docs 
Co-authored-by: Tom Cosgrove <tom.cosgrove@arm.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 12:25:25 +01:00
Dave Rodgman
38b227c16b Improve docs 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 12:18:27 +01:00
Dave Rodgman
ac69b45486 Document and test mbedtls_ct_size_if_else_0 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 12:18:13 +01:00
Dave Rodgman
065f912465 Fix comment typo 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 12:11:58 +01:00
Dave Rodgman
98ddc01a7c Rename ...if0 to ...else_0 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 12:11:31 +01:00
Dave Rodgman
b7825ceb3e Rename uint->bool operators to reflect input types 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-10 11:58:18 +01:00
Dave Rodgman
205295c576 Tidy-up: move GCC warning fix to constant_time_impl.h 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-08-01 14:10:56 +01:00
Dave Rodgman
9ee0e1f6fe Remove GCC redundant-decls workaround for mbedtls_ct_memcmp 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-31 12:43:23 +01:00
Dave Rodgman
0172de8b3d Fix docs grammar 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-31 12:43:23 +01:00
Dave Rodgman
741d423ef8 Clarify docs for mbedtls_ct_memcpy_if 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-31 12:43:23 +01:00
Dave Rodgman
93cec45af3 Improve docs for mbedtls_ct_compiler_opaque 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-31 12:43:23 +01:00
Dave Rodgman
fba559822f Ensure constant values not known to compiler 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-14 13:44:22 +01:00
Dave Rodgman
a02b36886c Fix gcc warnings when -Wredundant-decls set 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-07-14 13:43:39 +01:00
Dave Rodgman
c882adf0ca Docs improvement 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-06-21 07:37:56 +01:00
Dave Rodgman
f27727b22e Docs update 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-06-12 18:33:20 +01:00
Dave Rodgman
3108645d67 Document and test that memcpy_if may have src == dest 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
2b4486a014 Rename mbedtls_ct_uint_if_new to mbedtls_ct_uint_if 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
2243137715 Remove old interface 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
231a516682 Remove not-needed mbedtls_ct_mpi_uint_cond_assign 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
6cee26db16 Remove old interface for mem_move_to_left 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
40a41d0461 Introduce new CT interface (retain old interface) 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
7d4f019810 Move some bignum functions out of constant_time module 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
19e8cd06fe Move mbedtls_ct_rsaes_pkcs1_v15_unpadding into rsa.c 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
0afe001871 Expose mbedtls_ct_size_gt and mbedtls_ct_mem_move_to_left in ct interface 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
2801f7fa8d Move mbedtls_ct_hmac into ssl_msg.c 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
8c94e219f9 Evolve mbedtls_ct_uchar_in_range_if interface 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:48 +01:00
Dave Rodgman
0ee9683987 Move mbedtls_ct_base64_(enc|dec)_char into base64.c 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
 2023-05-26 12:42:40 +01:00
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
95b5addcd6 Don't test mbedtls_mpi_core_lt_ct with 0 limbs 
A core MPI must have at least 1 limb. We can no longer test with 0 limbs,
and we don't need to anyway, so don't try.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2022-11-09 11:18:38 +01:00
Andrzej Kurek
084334c8f2 Compile constant time masking and hmac if there are suites using MAC 
This is used in TLS 1.2 authentication with NULL cipher,
when there are no TLS_CBC suites.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
 2022-10-19 08:35:08 -04:00
Przemek Stekiel
89ad62352d Fix guards for mbedtls_ct_size_mask() and mbedtls_ct_memcpy_if_eq() 
Both functions are used when MBEDTLS_SSL_SOME_SUITES_USE_MAC is defined not MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC.

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
 2022-09-27 15:04:14 +02:00
Janos Follath
af3f39c01c Fix typos 
Co-authored-by: Tom Cosgrove <81633263+tom-cosgrove-arm@users.noreply.github.com>
Co-authored-by: Werner Lewis <Werner.Lewis@arm.com>

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-08-22 09:08:04 +01:00
Janos Follath
b7a88eca42 Bignum: Apply naming conventions 
Numbers:

- A, B for mbedtls_mpi_uint* operands
- a, b for mbedtls_mpi_uint operands
- X or x for result
- HAC references where applicable

Lengths:

- Reserve size or length for length/size in bytes or byte buffers.
- For length of mbedtls_mpi_uint* buffers use limbs
- Length parameters are qualified if possible (eg. input_length or
  a_limbs)

Setup functions:

- The parameters match the corresponding structure member's name
- The structure to set up is a standard lower case name even if in other
  functions different naming conventions would apply

Scope of changes/conventions:

- bignum_core
- bignum_mod
- bignum_mod_raw

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-08-19 13:11:22 +01:00
Janos Follath
6318468183 Improve bignum documentation 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-08-11 17:42:59 +01:00
Janos Follath
23bdeca64d Add core constant time comparison 
Unfortunately reusing the new function from the signed constant time
comparison is not trivial.

One option would be to do temporary conditional swaps which would prevent
qualifying input to const. Another way would be to add an additional
flag for the sign and make it an integral part of the computation, which
would defeat the purpose of having an unsigned core comparison.

Going with two separate function for now and the signed version can be
retired/compiled out with the legacy API eventually.

The new function in theory could be placed into either
`library/constant_time.c` or `library/bignum_new.c`. Going with the
first as the other functions in the second are not constant time yet and
this distinction seems more valuable for new (as opposed to belonging to
the `_core` functions.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2022-08-05 17:08:52 +01:00
Paul Elliott
5260ce27ed Fix uninitialised memory access in constant time functions 
Fix an issue reported by Coverity whereby some constant time functions
called from the ssl decrypt code could potentially access uninitialised
memory.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
 2022-05-19 18:23:24 +01:00
Neil Armstrong
2968d306e4 Implement mbedtls_ct_hmac() using PSA hash API 
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
 2022-02-25 15:16:50 +01:00
Gabor Mezei
a09697527b Add documentation for the functions 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-26 17:25:14 +01:00
Gabor Mezei
14d5fac11d Unify function parameters 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-26 17:23:26 +01:00
Gabor Mezei
358829abc9 Move mbedtls_ct_base64_dec_value function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-26 17:14:52 +01:00
Gabor Mezei
9a4074aa1e Move mbedtls_ct_base64_enc_char function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-26 17:14:21 +01:00
Gabor Mezei
642eeb2879 Fix documentation and comments 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-03 16:13:32 +01:00
Gabor Mezei
22c9a6fccc Rename internal header constant_time.h to constant_time_internal.h 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-10-20 12:15:20 +02:00