Mercurial > dropbear

annotate libtommath/bn_mp_add_d.c @ 400:a5bca950120d channel-fix

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merge of '1dfbc5ef92391d01b576c8506061927869a89887' and '275426b7a4b94a0507c78327f86bcd2cd0b0f985'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:45 +0000
parents eed26cff980b
children 5ff8218bcee9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
284
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parents:
diff changeset
1 #include <tommath.h>
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diff changeset
2 #ifdef BN_MP_ADD_D_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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parents:
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4 *
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diff changeset
5 * LibTomMath is a library that provides multiple-precision
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diff changeset
6 * integer arithmetic as well as number theoretic functionality.
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diff changeset
7 *
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
8 * The library was designed directly after the MPI library by
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diff changeset
9 * Michael Fromberger but has been written from scratch with
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diff changeset
10 * additional optimizations in place.
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diff changeset
11 *
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
12 * The library is free for all purposes without any express
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
13 * guarantee it works.
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Matt Johnston <matt@ucc.asn.au>
parents:
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14 *
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Matt Johnston <matt@ucc.asn.au>
parents:
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
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16 */
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17
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 /* single digit addition */
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diff changeset
19 int
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
20 mp_add_d (mp_int * a, mp_digit b, mp_int * c)
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Matt Johnston <matt@ucc.asn.au>
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21 {
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Matt Johnston <matt@ucc.asn.au>
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22 int res, ix, oldused;
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23 mp_digit *tmpa, *tmpc, mu;
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24
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25 /* grow c as required */
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Matt Johnston <matt@ucc.asn.au>
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26 if (c->alloc < a->used + 1) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
27 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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28 return res;
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29 }
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30 }
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31
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Matt Johnston <matt@ucc.asn.au>
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32 /* if a is negative and |a| >= b, call c = |a| - b */
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Matt Johnston <matt@ucc.asn.au>
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33 if (a->sign == MP_NEG && (a->used > 1 || a->dp[0] >= b)) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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34 /* temporarily fix sign of a */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
35 a->sign = MP_ZPOS;
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36
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
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37 /* c = |a| - b */
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Matt Johnston <matt@ucc.asn.au>
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38 res = mp_sub_d(a, b, c);
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39
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
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40 /* fix sign */
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Matt Johnston <matt@ucc.asn.au>
parents:
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41 a->sign = c->sign = MP_NEG;
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42
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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43 return res;
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44 }
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45
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
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46 /* old number of used digits in c */
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Matt Johnston <matt@ucc.asn.au>
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47 oldused = c->used;
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48
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49 /* sign always positive */
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50 c->sign = MP_ZPOS;
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51
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
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52 /* source alias */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
53 tmpa = a->dp;
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54
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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parents:
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55 /* destination alias */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
56 tmpc = c->dp;
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57
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58 /* if a is positive */
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59 if (a->sign == MP_ZPOS) {
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Matt Johnston <matt@ucc.asn.au>
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60 /* add digit, after this we're propagating
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61 * the carry.
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62 */
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63 *tmpc = *tmpa++ + b;
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64 mu = *tmpc >> DIGIT_BIT;
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Matt Johnston <matt@ucc.asn.au>
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65 *tmpc++ &= MP_MASK;
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66
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67 /* now handle rest of the digits */
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68 for (ix = 1; ix < a->used; ix++) {
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69 *tmpc = *tmpa++ + mu;
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Matt Johnston <matt@ucc.asn.au>
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70 mu = *tmpc >> DIGIT_BIT;
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Matt Johnston <matt@ucc.asn.au>
parents:
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71 *tmpc++ &= MP_MASK;
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Matt Johnston <matt@ucc.asn.au>
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72 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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73 /* set final carry */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
74 ix++;
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Matt Johnston <matt@ucc.asn.au>
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75 *tmpc++ = mu;
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76
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
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77 /* setup size */
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Matt Johnston <matt@ucc.asn.au>
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78 c->used = a->used + 1;
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Matt Johnston <matt@ucc.asn.au>
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79 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
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80 /* a was negative and |a| < b */
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Matt Johnston <matt@ucc.asn.au>
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81 c->used = 1;
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Matt Johnston <matt@ucc.asn.au>
parents:
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82
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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83 /* the result is a single digit */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 if (a->used == 1) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 *tmpc++ = b - a->dp[0];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 } else {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 *tmpc++ = b;
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Matt Johnston <matt@ucc.asn.au>
parents:
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88 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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89
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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90 /* setup count so the clearing of oldused
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 * can fall through correctly
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 ix = 1;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* now zero to oldused */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 while (ix++ < oldused) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 *tmpc++ = 0;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 mp_clamp(c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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101
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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104
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 #endif