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Diffstat (limited to '')
| -rw-r--r-- | mpi/mpiutil.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/mpi/mpiutil.c b/mpi/mpiutil.c index 82ba87112..cbbe10d25 100644 --- a/mpi/mpiutil.c +++ b/mpi/mpiutil.c @@ -323,6 +323,36 @@ mpi_copy( MPI a ) } +/**************** + * This function allocates an MPI which is optimized to hold + * a value as large as the one given in the arhgument and allocates it + * with the same flags as A. + */ +MPI +mpi_alloc_like( MPI a ) +{ + MPI b; + + if( a && (a->flags & 4) ) { + void *p = m_is_secure(a->d)? m_alloc_secure( a->nbits ) + : m_alloc( a->nbits ); + memcpy( p, a->d, a->nbits ); + b = mpi_set_opaque( NULL, p, a->nbits ); + } + else if( a ) { + b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs ) + : mpi_alloc( a->nlimbs ); + b->nlimbs = 0; + b->sign = 0; + b->flags = a->flags; + b->nbits = 0; + } + else + b = NULL; + return b; +} + + void mpi_set( MPI w, MPI u) { |