diff options
Diffstat (limited to 'libtommath/bn_mp_clear.c')
| -rw-r--r-- | libtommath/bn_mp_clear.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libtommath/bn_mp_clear.c b/libtommath/bn_mp_clear.c new file mode 100644 index 0000000..1dc053b --- /dev/null +++ b/libtommath/bn_mp_clear.c @@ -0,0 +1,43 @@ +#include <tommath.h> +#ifdef BN_MP_CLEAR_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis + * + * LibTomMath is a library that provides multiple-precision + * integer arithmetic as well as number theoretic functionality. + * + * The library was designed directly after the MPI library by + * Michael Fromberger but has been written from scratch with + * additional optimizations in place. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org + */ + +/* clear one (frees) */ +void +mp_clear (mp_int * a) +{ + volatile mp_digit *p; + int len; + + /* only do anything if a hasn't been freed previously */ + if (a->dp != NULL) { + /* first zero the digits */ + len = a->alloc; + p = a->dp; + while (len--) { + *p++ = 0; + } + + /* free ram */ + XFREE(a->dp); + + /* reset members to make debugging easier */ + a->dp = NULL; + a->alloc = a->used = 0; + a->sign = MP_ZPOS; + } +} +#endif |