Donatien Garnier
A super trimmed down TLS stack, GPL licensed
Dependents: MiniTLS-HTTPS-Example
MiniTLS - A super trimmed down TLS/SSL Library for embedded devices Author: Donatien Garnier Copyright (C) 2013-2014 AppNearMe Ltd
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
math/exptmod/fp_2expt.c@4:cbaf466d717d, 2014-06-10 (annotated)
- Committer:
- MiniTLS
- Date:
- Tue Jun 10 14:23:09 2014 +0000
- Revision:
- 4:cbaf466d717d
- Parent:
- 0:35aa5be3b78d
Fixes for mbed
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| MiniTLS | 0:35aa5be3b78d | 1 | /* TomsFastMath, a fast ISO C bignum library. |
| MiniTLS | 0:35aa5be3b78d | 2 | * |
| MiniTLS | 0:35aa5be3b78d | 3 | * This project is meant to fill in where LibTomMath |
| MiniTLS | 0:35aa5be3b78d | 4 | * falls short. That is speed ;-) |
| MiniTLS | 0:35aa5be3b78d | 5 | * |
| MiniTLS | 0:35aa5be3b78d | 6 | * This project is public domain and free for all purposes. |
| MiniTLS | 0:35aa5be3b78d | 7 | * |
| MiniTLS | 0:35aa5be3b78d | 8 | * Tom St Denis, tomstdenis@gmail.com |
| MiniTLS | 0:35aa5be3b78d | 9 | */ |
| MiniTLS | 0:35aa5be3b78d | 10 | #include <tfm.h> |
| MiniTLS | 0:35aa5be3b78d | 11 | |
| MiniTLS | 0:35aa5be3b78d | 12 | /* computes a = 2**b */ |
| MiniTLS | 0:35aa5be3b78d | 13 | void fp_2expt(fp_int *a, int b) |
| MiniTLS | 0:35aa5be3b78d | 14 | { |
| MiniTLS | 0:35aa5be3b78d | 15 | int z; |
| MiniTLS | 0:35aa5be3b78d | 16 | |
| MiniTLS | 0:35aa5be3b78d | 17 | /* zero a as per default */ |
| MiniTLS | 0:35aa5be3b78d | 18 | fp_zero (a); |
| MiniTLS | 0:35aa5be3b78d | 19 | |
| MiniTLS | 0:35aa5be3b78d | 20 | if (b < 0) { |
| MiniTLS | 0:35aa5be3b78d | 21 | return; |
| MiniTLS | 0:35aa5be3b78d | 22 | } |
| MiniTLS | 0:35aa5be3b78d | 23 | |
| MiniTLS | 0:35aa5be3b78d | 24 | z = b / DIGIT_BIT; |
| MiniTLS | 0:35aa5be3b78d | 25 | if (z >= FP_SIZE) { |
| MiniTLS | 0:35aa5be3b78d | 26 | return; |
| MiniTLS | 0:35aa5be3b78d | 27 | } |
| MiniTLS | 0:35aa5be3b78d | 28 | |
| MiniTLS | 0:35aa5be3b78d | 29 | /* set the used count of where the bit will go */ |
| MiniTLS | 0:35aa5be3b78d | 30 | a->used = z + 1; |
| MiniTLS | 0:35aa5be3b78d | 31 | |
| MiniTLS | 0:35aa5be3b78d | 32 | /* put the single bit in its place */ |
| MiniTLS | 0:35aa5be3b78d | 33 | a->dp[z] = ((fp_digit)1) << (b % DIGIT_BIT); |
| MiniTLS | 0:35aa5be3b78d | 34 | } |
| MiniTLS | 0:35aa5be3b78d | 35 | |
| MiniTLS | 0:35aa5be3b78d | 36 | |
| MiniTLS | 0:35aa5be3b78d | 37 | /* $Source: /cvs/libtom/tomsfastmath/src/exptmod/fp_2expt.c,v $ */ |
| MiniTLS | 0:35aa5be3b78d | 38 | /* $Revision: 1.1 $ */ |
| MiniTLS | 0:35aa5be3b78d | 39 | /* $Date: 2006/12/31 21:25:53 $ */ |
