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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-17 17:45:33 +01:00
parent fe76af20aa
commit 585f7f776d
2 changed files with 12 additions and 12 deletions
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8
library/constant_time.c
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@ -139,13 +139,13 @@ void mbedtls_ct_memmove_left(void *start, size_t total, size_t offset)
j = j % total; j = j % total;
// Read a byte // Read a byte
uint8_t b = ((uint8_t*)start)[j]; uint8_t b = ((uint8_t *) start)[j];
// Set it to zero if it's out of range // Set it to zero if it's out of range
b = mbedtls_ct_uint_if0(not_dummy, b); b = mbedtls_ct_uint_if0(not_dummy, b);
// Write the byte to start[i] // Write the byte to start[i]
((uint8_t*)start)[i] = b; ((uint8_t *) start)[i] = b;
} }
} }
@ -192,8 +192,8 @@ void mbedtls_ct_memcpy_offset(unsigned char *dest,
size_t offsetval; size_t offsetval;
for (offsetval = offset_min; offsetval <= offset_max; offsetval++) { for (offsetval = offset_min; offsetval <= offset_max; offsetval++) {
mbedtls_ct_memcpy_if(mbedtls_ct_bool_eq(offsetval, offset), dest, src + offsetval, NULL, mbedtls_ct_memcpy_if(mbedtls_ct_bool_eq(offsetval, offset), dest, src + offsetval, NULL,
len); len);
} }
} }

16
library/constant_time_impl.h
View file

@ -178,12 +178,6 @@ static inline unsigned char mbedtls_ct_uchar_in_range_if(unsigned char low,
* Everything below here is trivial wrapper functions * Everything below here is trivial wrapper functions
*/ */
static inline mbedtls_ct_condition_t mbedtls_ct_bool_eq(mbedtls_ct_uint_t x,
mbedtls_ct_uint_t y)
{
return ~mbedtls_ct_bool_ne(x, y);
}
static inline size_t mbedtls_ct_size_if(mbedtls_ct_condition_t condition, static inline size_t mbedtls_ct_size_if(mbedtls_ct_condition_t condition,
size_t if1, size_t if1,
size_t if0) size_t if0)
@ -200,8 +194,8 @@ static inline unsigned mbedtls_ct_uint_if(mbedtls_ct_condition_t condition,
#if defined(MBEDTLS_BIGNUM_C) #if defined(MBEDTLS_BIGNUM_C)
static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if(mbedtls_ct_condition_t condition, \ static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if(mbedtls_ct_condition_t condition,
mbedtls_mpi_uint if1, \ mbedtls_mpi_uint if1,
mbedtls_mpi_uint if0) mbedtls_mpi_uint if0)
{ {
return (mbedtls_mpi_uint) mbedtls_ct_if(condition, return (mbedtls_mpi_uint) mbedtls_ct_if(condition,
@ -231,6 +225,12 @@ static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if0(mbedtls_ct_condition_t co
#endif /* MBEDTLS_BIGNUM_C */ #endif /* MBEDTLS_BIGNUM_C */
static inline mbedtls_ct_condition_t mbedtls_ct_bool_eq(mbedtls_ct_uint_t x,
mbedtls_ct_uint_t y)
{
return ~mbedtls_ct_bool_ne(x, y);
}
static inline mbedtls_ct_condition_t mbedtls_ct_bool_gt(mbedtls_ct_uint_t x, static inline mbedtls_ct_condition_t mbedtls_ct_bool_gt(mbedtls_ct_uint_t x,
mbedtls_ct_uint_t y) mbedtls_ct_uint_t y)
{ {