4e3f1344a5
tommath.h contains declarations for the public part of the library. tommath_private.h contains the functions which are private to ltm and should not be exposed to the public.
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#include <tommath_private.h>
|
|
#ifdef BN_MP_READ_UNSIGNED_BIN_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, tstdenis82@gmail.com, http://libtom.org
|
|
*/
|
|
|
|
/* reads a unsigned char array, assumes the msb is stored first [big endian] */
|
|
int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c)
|
|
{
|
|
int res;
|
|
|
|
/* make sure there are at least two digits */
|
|
if (a->alloc < 2) {
|
|
if ((res = mp_grow(a, 2)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* zero the int */
|
|
mp_zero (a);
|
|
|
|
/* read the bytes in */
|
|
while (c-- > 0) {
|
|
if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
#ifndef MP_8BIT
|
|
a->dp[0] |= *b++;
|
|
a->used += 1;
|
|
#else
|
|
a->dp[0] = (*b & MP_MASK);
|
|
a->dp[1] |= ((*b++ >> 7U) & 1);
|
|
a->used += 2;
|
|
#endif
|
|
}
|
|
mp_clamp (a);
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* $Source$ */
|
|
/* $Revision$ */
|
|
/* $Date$ */
|