Mercurial > dropbear
comparison bn_mp_montgomery_setup.c @ 386:97db060d0ef5 libtommath-orig libtommath-0.40
Update to LibTomMath 0.40
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 03:11:15 +0000 |
parents | 91fbc376f010 |
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282:91fbc376f010 | 386:97db060d0ef5 |
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10 * additional optimizations in place. | 10 * additional optimizations in place. |
11 * | 11 * |
12 * The library is free for all purposes without any express | 12 * The library is free for all purposes without any express |
13 * guarantee it works. | 13 * guarantee it works. |
14 * | 14 * |
15 * Tom St Denis, [email protected], http://math.libtomcrypt.org | 15 * Tom St Denis, [email protected], http://math.libtomcrypt.com |
16 */ | 16 */ |
17 | 17 |
18 /* setups the montgomery reduction stuff */ | 18 /* setups the montgomery reduction stuff */ |
19 int | 19 int |
20 mp_montgomery_setup (mp_int * n, mp_digit * rho) | 20 mp_montgomery_setup (mp_int * n, mp_digit * rho) |
46 #ifdef MP_64BIT | 46 #ifdef MP_64BIT |
47 x *= 2 - b * x; /* here x*a==1 mod 2**64 */ | 47 x *= 2 - b * x; /* here x*a==1 mod 2**64 */ |
48 #endif | 48 #endif |
49 | 49 |
50 /* rho = -1/m mod b */ | 50 /* rho = -1/m mod b */ |
51 *rho = (((mp_word)1 << ((mp_word) DIGIT_BIT)) - x) & MP_MASK; | 51 *rho = (unsigned long)(((mp_word)1 << ((mp_word) DIGIT_BIT)) - x) & MP_MASK; |
52 | 52 |
53 return MP_OKAY; | 53 return MP_OKAY; |
54 } | 54 } |
55 #endif | 55 #endif |
56 | |
57 /* $Source: /cvs/libtom/libtommath/bn_mp_montgomery_setup.c,v $ */ | |
58 /* $Revision: 1.4 $ */ | |
59 /* $Date: 2006/12/04 21:34:03 $ */ |