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author | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:46:09 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:46:09 (GMT) |
commit | 768f87f613cc9789fcf8073018fa02178c8c91df (patch) | |
tree | ec633f5608ef498bee52a5f42c12c49493ec8bf8 /tcl8.6/libtommath/bn_mp_set_int.c | |
parent | 07e464099b99459d0a37757771791598ef3395d9 (diff) | |
parent | 05fa4c89f20e9769db0e6c0b429cef2590771ace (diff) | |
download | blt-768f87f613cc9789fcf8073018fa02178c8c91df.zip blt-768f87f613cc9789fcf8073018fa02178c8c91df.tar.gz blt-768f87f613cc9789fcf8073018fa02178c8c91df.tar.bz2 |
Merge commit '05fa4c89f20e9769db0e6c0b429cef2590771ace' as 'tcl8.6'
Diffstat (limited to 'tcl8.6/libtommath/bn_mp_set_int.c')
-rw-r--r-- | tcl8.6/libtommath/bn_mp_set_int.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tcl8.6/libtommath/bn_mp_set_int.c b/tcl8.6/libtommath/bn_mp_set_int.c new file mode 100644 index 0000000..b0fc344 --- /dev/null +++ b/tcl8.6/libtommath/bn_mp_set_int.c @@ -0,0 +1,44 @@ +#include <tommath.h> +#ifdef BN_MP_SET_INT_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://math.libtomcrypt.com + */ + +/* set a 32-bit const */ +int mp_set_int (mp_int * a, unsigned long b) +{ + int x, res; + + mp_zero (a); + + /* set four bits at a time */ + for (x = 0; x < 8; x++) { + /* shift the number up four bits */ + if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) { + return res; + } + + /* OR in the top four bits of the source */ + a->dp[0] |= (b >> 28) & 15; + + /* shift the source up to the next four bits */ + b <<= 4; + + /* ensure that digits are not clamped off */ + a->used += 1; + } + mp_clamp (a); + return MP_OKAY; +} +#endif |