diff options
author | Matthieu Patou <mat@matws.net> | 2010-08-15 18:31:28 +0400 |
---|---|---|
committer | Andrew Bartlett <abartlet@samba.org> | 2010-10-03 01:15:04 +0000 |
commit | ab6e3fce040f9ad27cbce44e9038a24f15b601c8 (patch) | |
tree | ab99a431c9610927b5d0d26335d2712b509fd6dc /source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c | |
parent | 197a1514d62494cc8b862d169c841a26e04b8925 (diff) | |
download | samba-ab6e3fce040f9ad27cbce44e9038a24f15b601c8.tar.gz samba-ab6e3fce040f9ad27cbce44e9038a24f15b601c8.tar.bz2 samba-ab6e3fce040f9ad27cbce44e9038a24f15b601c8.zip |
s4:heimdal: import lorikeet-heimdal-201009250123 (commit 42cabfb5b683dbcb97d583c397b897507689e382)
I based this on Matthieu's import of lorikeet-heimdal, and then
updated it to this commit.
Andrew Bartlett
Diffstat (limited to 'source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c')
-rw-r--r-- | source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c b/source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c new file mode 100644 index 0000000000..f422ffc994 --- /dev/null +++ b/source4/heimdal/lib/hcrypto/libtommath/bn_mp_2expt.c @@ -0,0 +1,48 @@ +#include <tommath.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, tomstdenis@gmail.com, 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 + +/* $Source: /cvs/libtom/libtommath/bn_mp_2expt.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2006/12/28 01:25:13 $ */ |