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42 commits

Author SHA1 Message Date
Gabor Mezei dbe0f892b3
Fix documentation and comments 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:33:19 +01:00
Gabor Mezei c0ae1cf45a
Rename internal header constant_time.h to constant_time_internal.h 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:33:19 +01:00
Gabor Mezei 18a44949d0
Rename constant-time functions to have mbedtls_ct prefix 
Rename functions to better suite with the module name.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:32:01 +01:00
Gabor Mezei 61bf64fbd0
Bind functions' availability for config options 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:54 +01:00
Gabor Mezei e24dea8225
Move mbedtls_cf_memcmp to a new public header 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:54 +01:00
Gabor Mezei 2b35880d41
Bind functions' availability for config options 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei 4e2de62fef
Remove unused function 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei fd8a42d914
Make functions static 
These functions are only used as an auxiliary function for constant-time functions.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei 4b4e4d8880
Update documentation and comments 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei 91deea7765
Rename and reorder function parameters 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei 150bdee126
Use condition for not sensitive data 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:53 +01:00
Gabor Mezei 3c38b6e9e1
Move implementation specific comment 
This comment is about how the functions are implemented, not about their
public interface, so it doesn't belong in the header file.
It applies to everything in constant_time.c so moved there.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
Gabor Mezei 2c5ed2244b
Make mbedtls_cf_size_mask_lt function static 
The mbedtls_cf_size_mask_lt is solely used as an auxiliary function
for mbedtls_cf_size_mask_ge.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
gabor-mezei-arm d5a392aa2c
Fix missing includes 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
gabor-mezei-arm 7e6a1eaf8f
Add documentation for the functions 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
gabor-mezei-arm 1ffd0ccf02
Unify equality checker functions return value 
The equality checker functions always return 0 or 1 value,
thus the type of return value can be the same dispite of the
size of the parameters.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
gabor-mezei-arm 60febd5d8a
Propagate usage of mask generation functions 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:52 +01:00
gabor-mezei-arm 2f2c0bead3
Unify mask generation functions 
Generate all-bits 0 or all bits 1 mask from a value instead of from a bit.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:51 +01:00
gabor-mezei-arm 5e4882498e
Unify function parameters 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:51 +01:00
gabor-mezei-arm 378e7eb5cc
Unify memcmp functions 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:51 +01:00
gabor-mezei-arm 04087dffcd
Typo: Unify indentation of function parameters 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:51 +01:00
gabor-mezei-arm f52941ef73
Move mbedtls_cf_rsaes_pkcs1_v15_unpadding function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:04:51 +01:00
gabor-mezei-arm bc3a288b2c
Create mbedtls_cf_size_if function 
Add a constant-time function with size_t parameter for choosing
between two integer values, like the ?: ternary operator.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:03:04 +01:00
gabor-mezei-arm b10301d2fc
Move mbedtls_mpi_lt_mpi_ct function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:02:38 +01:00
gabor-mezei-arm 58fc8a65ab Move mbedtls_mpi_safe_cond_swap function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:01:08 +01:00
gabor-mezei-arm b8caeeed5c Move mbedtls_mpi_safe_cond_assign function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 11:00:14 +01:00
gabor-mezei-arm cb4317b723
Move mbedtls_cf_hmac function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:59:04 +01:00
gabor-mezei-arm 0f7b9e43e9
Move mbedtls_cf_memcpy_offset function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:59:04 +01:00
gabor-mezei-arm ee06febbb4
Move mbedtls_cf_memcpy_if_eq function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:59:04 +01:00
gabor-mezei-arm 7b23c0b46d
Move mbedtls_cf_mem_move_to_left function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:59:04 +01:00
gabor-mezei-arm 043192d209 Move mbedtls_cf_mpi_uint_cond_assign function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:55:56 +01:00
gabor-mezei-arm 5cec8b44a8
Move mbedtls_cf_cond_select_sign function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:54:20 +01:00
gabor-mezei-arm 7533253125
Move mbedtls_cf_uint_if function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:52:42 +01:00
gabor-mezei-arm 097d4f555e
Move mbedtls_cf_mpi_uint_lt function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:52:01 +01:00
gabor-mezei-arm 9d7bf09333
Move mbedtls_cf_size_gt function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:04:49 +01:00
gabor-mezei-arm 96584ddd4b
Move mbedtls_cf_size_bool_eq function to the constant-time module 
There were multiple functions called mbedtls_cf_size_bool_eq. They had exactly
the same behavior, so move the one in bignum.c and remove the other.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:03:55 +01:00
gabor-mezei-arm a2bcabceb2
Move mbedtls_cf_size_mask_ge function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:00:17 +01:00
gabor-mezei-arm 4d6b14624e
Move mbedtls_cf_size_mask_lt function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:00:17 +01:00
gabor-mezei-arm d361ccd663
Move mbedtls_cf_size_mask function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:00:17 +01:00
gabor-mezei-arm c11cac9f1b
Move mbedtls_cf_uint_mask function to the constant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:00:17 +01:00
gabor-mezei-arm 944c107744
Move contatnt-time memcmp functions to the contant-time module 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 10:00:12 +01:00
gabor-mezei-arm 9055972227
Add a new file for constant-time functions 
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
 2021-11-11 09:39:12 +01:00