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annotate libtommath/bn_mp_dr_reduce.c @ 528:378a6389f88e

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- Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
author Matt Johnston <matt@ucc.asn.au>
date Wed, 25 Feb 2009 14:04:02 +0000
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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diff changeset
1 #include <tommath.h>
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2 #ifdef BN_MP_DR_REDUCE_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
389
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* reduce "x" in place modulo "n" using the Diminished Radix algorithm.
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19 *
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20 * Based on algorithm from the paper
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21 *
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22 * "Generating Efficient Primes for Discrete Log Cryptosystems"
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23 * Chae Hoon Lim, Pil Joong Lee,
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24 * POSTECH Information Research Laboratories
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25 *
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26 * The modulus must be of a special format [see manual]
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27 *
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28 * Has been modified to use algorithm 7.10 from the LTM book instead
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29 *
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30 * Input x must be in the range 0 <= x <= (n-1)**2
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31 */
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32 int
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33 mp_dr_reduce (mp_int * x, mp_int * n, mp_digit k)
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34 {
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35 int err, i, m;
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36 mp_word r;
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37 mp_digit mu, *tmpx1, *tmpx2;
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38
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39 /* m = digits in modulus */
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40 m = n->used;
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41
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42 /* ensure that "x" has at least 2m digits */
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43 if (x->alloc < m + m) {
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44 if ((err = mp_grow (x, m + m)) != MP_OKAY) {
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45 return err;
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46 }
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47 }
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48
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49 /* top of loop, this is where the code resumes if
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50 * another reduction pass is required.
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51 */
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52 top:
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53 /* aliases for digits */
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54 /* alias for lower half of x */
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55 tmpx1 = x->dp;
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56
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57 /* alias for upper half of x, or x/B**m */
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58 tmpx2 = x->dp + m;
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59
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60 /* set carry to zero */
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61 mu = 0;
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62
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63 /* compute (x mod B**m) + k * [x/B**m] inline and inplace */
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64 for (i = 0; i < m; i++) {
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65 r = ((mp_word)*tmpx2++) * ((mp_word)k) + *tmpx1 + mu;
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66 *tmpx1++ = (mp_digit)(r & MP_MASK);
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67 mu = (mp_digit)(r >> ((mp_word)DIGIT_BIT));
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68 }
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69
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70 /* set final carry */
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71 *tmpx1++ = mu;
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72
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73 /* zero words above m */
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74 for (i = m + 1; i < x->used; i++) {
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75 *tmpx1++ = 0;
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76 }
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77
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78 /* clamp, sub and return */
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79 mp_clamp (x);
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80
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81 /* if x >= n then subtract and reduce again
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82 * Each successive "recursion" makes the input smaller and smaller.
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83 */
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84 if (mp_cmp_mag (x, n) != MP_LT) {
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85 s_mp_sub(x, n, x);
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86 goto top;
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87 }
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88 return MP_OKAY;
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89 }
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90 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
91
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
92 /* $Source: /cvs/libtom/libtommath/bn_mp_dr_reduce.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
93 /* $Revision: 1.3 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
94 /* $Date: 2006/03/31 14:18:44 $ */