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Improved on the fix of #309 and extended the test to cover subroutines.

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This commit is contained in:
Janos Follath 2015-10-25 12:29:13 +01:00 • committed by Manuel Pégourié-Gonnard
parent d0e0c03520
commit 5429c0a7d0
2 changed files with 21 additions and 5 deletions
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15
library/bignum.c
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@ -887,12 +887,19 @@ int mbedtls_mpi_add_abs( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
if( X == B )
{
const mbedtls_mpi *T;
if( B == A )
{
// Making a temporary copy instead of shifting by one to deny
// the possibility of corresponding side-channel attacks.
mbedtls_mpi TB;
if( B == A)
return mbedtls_mpi_shift_l( X, 1 );
mbedtls_mpi_init( &TB );
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &TB, B ) );
return mbedtls_mpi_add_abs( X, A, &TB );
}
T = A; A = X; B = T;
B = A; A = X;
}
if( X != A )