Mercurial > dropbear
view libtommath/bn_mp_2expt.c @ 1635:c9b5017b0a7b
drop obsolete definition for MAX_KEXHASHBUF (#65)
The last code to make use of MAX_KEXHASHBUF was removed in 2005:
https://github.com/mkj/dropbear/commit/736f370dce614b717193f45d084e9e009de723ce
Signed-off-by: Andre McCurdy <[email protected]>
author | Andre McCurdy <armccurdy@gmail.com> |
---|---|
date | Wed, 20 Mar 2019 08:01:41 -0700 |
parents | 8bba51a55704 |
children | f52919ffd3b1 |
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#include <tommath_private.h> #ifdef BN_MP_2EXPT_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, [email protected], http://libtom.org */ /* computes a = 2**b * * Simple algorithm which zeroes the int, grows it then just sets one bit * as required. */ int mp_2expt (mp_int * a, int b) { int res; /* zero a as per default */ mp_zero (a); /* grow a to accomodate the single bit */ if ((res = mp_grow (a, (b / DIGIT_BIT) + 1)) != MP_OKAY) { return res; } /* set the used count of where the bit will go */ a->used = (b / DIGIT_BIT) + 1; /* put the single bit in its place */ a->dp[b / DIGIT_BIT] = ((mp_digit)1) << (b % DIGIT_BIT); return MP_OKAY; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */