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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2022-08-30 15:15:02 +01:00
parent 5dd97e60d5
commit f0c8a8cf44
1 changed files with 11 additions and 6 deletions
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17
library/bignum_core.c
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@ -155,7 +155,7 @@ void mbedtls_mpi_core_bigendian_to_host( mbedtls_mpi_uint *A,
mbedtls_mpi_uint tmp;
/* Note that if cur_limb_left == cur_limb_right,
* this code effectively swaps the bytes only once. */
tmp = mpi_bigendian_to_host( *cur_limb_left );
tmp = mpi_bigendian_to_host( *cur_limb_left );
*cur_limb_left = mpi_bigendian_to_host( *cur_limb_right );
*cur_limb_right = tmp;
}
@ -298,15 +298,18 @@ mbedtls_mpi_uint mbedtls_mpi_core_add_if( mbedtls_mpi_uint *A,
size_t limbs,
unsigned cond )
{
mbedtls_mpi_uint c = 0, t;
mbedtls_mpi_uint c = 0;
for( size_t i = 0; i < limbs; i++ )
{
mbedtls_mpi_uint add = cond * B[i];
t = c;
t += A[i]; c = ( t < A[i] );
t += add; c += ( t < add );
mbedtls_mpi_uint t = c + A[i];
c = ( t < A[i] );
t += add;
c += ( t < add );
A[i] = t;
}
return( c );
}
@ -360,7 +363,9 @@ mbedtls_mpi_uint mbedtls_mpi_core_mla( mbedtls_mpi_uint *d, size_t d_len,
while( excess_len-- )
{
*d += c; c = ( *d < c ); d++;
*d += c;
c = ( *d < c );
d++;
}
return( c );