Add set_long and get_long functions
They work on platform-dependent long ints
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#include <tommath.h>
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#ifdef BN_MP_GET_INT_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/
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/* get the lower unsigned long of an mp_int, platform dependent */
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unsigned long mp_get_long(mp_int * a)
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{
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int i;
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unsigned long res;
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if (a->used == 0) {
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return 0;
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}
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/* get number of digits of the lsb we have to read */
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i = MIN(a->used,(int)((sizeof(unsigned long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
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/* get most significant digit of result */
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res = DIGIT(a,i);
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while (--i >= 0) {
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res = (res << DIGIT_BIT) | DIGIT(a,i);
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}
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return res;
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}
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#endif
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@ -0,0 +1,48 @@
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#include <tommath.h>
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#ifdef BN_MP_SET_INT_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/
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/* set a platform dependent unsigned long int */
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int mp_set_long (mp_int * a, unsigned long b)
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{
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int x, res;
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mp_zero (a);
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/* set four bits at a time */
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for (x = 0; x < sizeof(unsigned long) * 2; x++) {
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/* shift the number up four bits */
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if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) {
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return res;
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}
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/* OR in the top four bits of the source */
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a->dp[0] |= (b >> ((sizeof(unsigned long)) * 8 - 4)) & 15;
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/* shift the source up to the next four bits */
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b <<= 4;
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/* ensure that digits are not clamped off */
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a->used += 1;
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}
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mp_clamp (a);
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return MP_OKAY;
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}
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#endif
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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@ -242,9 +242,15 @@ void mp_set(mp_int *a, mp_digit b);
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/* set a 32-bit const */
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int mp_set_int(mp_int *a, unsigned long b);
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/* set a platform dependent unsigned long value */
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int mp_set_long(mp_int *a, unsigned long b);
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/* get a 32-bit value */
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unsigned long mp_get_int(mp_int * a);
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/* get a platform dependent unsigned long value */
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unsigned long mp_get_long(mp_int * a);
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/* initialize and set a digit */
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int mp_init_set (mp_int * a, mp_digit b);
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