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Removed recursion from fix #309.

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Janos Follath 2015-10-25 14:24:10 +01:00 committed by Manuel Pégourié-Gonnard
parent ff5317e99b
commit 2b806fad7b
1 changed files with 10 additions and 7 deletions
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17
library/bignum.c
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@ -889,23 +889,22 @@ int mpi_add_abs( mpi *X, const mpi *A, const mpi *B )
{ {
int ret; int ret;
size_t i, j; size_t i, j;
t_uint *o, *p, c; mpi_uint *o, *p, c;
mpi TB;
if( X == B ) if( X == B )
{ {
B = A; A = X;
if( B == A ) if( B == A )
{ {
// Making a temporary copy instead of shifting by one to deny // Making a temporary copy instead of shifting by one to deny
// the possibility of corresponding side-channel attacks. // the possibility of corresponding side-channel attacks.
mpi TB;
mpi_init( &TB ); mpi_init( &TB );
MBEDTLS_MPI_CHK( mpi_copy( &TB, B ) ); MPI_CHK( mpi_copy( &TB, B ) );
return mpi_add_abs( X, A, &TB ); B = &TB;
} }
B = A; A = X;
} }
if( X != A ) if( X != A )
@ -942,6 +941,10 @@ int mpi_add_abs( mpi *X, const mpi *A, const mpi *B )
} }
cleanup: cleanup:
if( &TB == B )
{
mpi_free( &TB );
}
return( ret ); return( ret );
} }