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Removed recursion from fix #309.

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This commit is contained in:
Janos Follath 2015-10-25 14:24:10 +01:00
parent 8483e28e21
commit 3fc644f246
1 changed files with 8 additions and 5 deletions
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13
library/bignum.c
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@ -859,22 +859,21 @@ int mbedtls_mpi_add_abs( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
int ret; int ret;
size_t i, j; size_t i, j;
mbedtls_mpi_uint *o, *p, c; mbedtls_mpi_uint *o, *p, c;
mbedtls_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.
mbedtls_mpi TB;
mbedtls_mpi_init( &TB ); mbedtls_mpi_init( &TB );
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &TB, B ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &TB, B ) );
return mbedtls_mpi_add_abs( X, A, &TB ); B = &TB;
} }
B = A; A = X;
} }
if( X != A ) if( X != A )
@ -911,6 +910,10 @@ int mbedtls_mpi_add_abs( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
} }
cleanup: cleanup:
if( &TB == B )
{
mbedtls_mpi_free( &TB );
}
return( ret ); return( ret );
} }