Mercurial > dropbear
annotate libtommath/bn_fast_s_mp_sqr.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
rev | line source |
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1 #include <tommath.h> |
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2 #ifdef BN_FAST_S_MP_SQR_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 |
284
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16 */ |
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17 |
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18 /* the jist of squaring... |
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19 * you do like mult except the offset of the tmpx [one that |
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20 * starts closer to zero] can't equal the offset of tmpy. |
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21 * So basically you set up iy like before then you min it with |
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22 * (ty-tx) so that it never happens. You double all those |
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23 * you add in the inner loop |
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24 |
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25 After that loop you do the squares and add them in. |
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26 */ |
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27 |
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28 int fast_s_mp_sqr (mp_int * a, mp_int * b) |
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29 { |
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30 int olduse, res, pa, ix, iz; |
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31 mp_digit W[MP_WARRAY], *tmpx; |
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32 mp_word W1; |
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33 |
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34 /* grow the destination as required */ |
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35 pa = a->used + a->used; |
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36 if (b->alloc < pa) { |
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37 if ((res = mp_grow (b, pa)) != MP_OKAY) { |
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38 return res; |
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39 } |
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40 } |
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41 |
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42 /* number of output digits to produce */ |
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43 W1 = 0; |
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44 for (ix = 0; ix < pa; ix++) { |
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45 int tx, ty, iy; |
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46 mp_word _W; |
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47 mp_digit *tmpy; |
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48 |
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49 /* clear counter */ |
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50 _W = 0; |
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51 |
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52 /* get offsets into the two bignums */ |
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53 ty = MIN(a->used-1, ix); |
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54 tx = ix - ty; |
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55 |
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56 /* setup temp aliases */ |
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57 tmpx = a->dp + tx; |
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58 tmpy = a->dp + ty; |
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59 |
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60 /* this is the number of times the loop will iterrate, essentially |
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61 while (tx++ < a->used && ty-- >= 0) { ... } |
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62 */ |
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63 iy = MIN(a->used-tx, ty+1); |
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64 |
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65 /* now for squaring tx can never equal ty |
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66 * we halve the distance since they approach at a rate of 2x |
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67 * and we have to round because odd cases need to be executed |
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68 */ |
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69 iy = MIN(iy, (ty-tx+1)>>1); |
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70 |
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71 /* execute loop */ |
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72 for (iz = 0; iz < iy; iz++) { |
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73 _W += ((mp_word)*tmpx++)*((mp_word)*tmpy--); |
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74 } |
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75 |
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76 /* double the inner product and add carry */ |
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77 _W = _W + _W + W1; |
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78 |
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79 /* even columns have the square term in them */ |
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80 if ((ix&1) == 0) { |
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81 _W += ((mp_word)a->dp[ix>>1])*((mp_word)a->dp[ix>>1]); |
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82 } |
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83 |
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84 /* store it */ |
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85 W[ix] = (mp_digit)(_W & MP_MASK); |
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86 |
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87 /* make next carry */ |
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88 W1 = _W >> ((mp_word)DIGIT_BIT); |
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89 } |
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90 |
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91 /* setup dest */ |
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92 olduse = b->used; |
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93 b->used = a->used+a->used; |
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94 |
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95 { |
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96 mp_digit *tmpb; |
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97 tmpb = b->dp; |
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98 for (ix = 0; ix < pa; ix++) { |
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99 *tmpb++ = W[ix] & MP_MASK; |
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100 } |
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101 |
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102 /* clear unused digits [that existed in the old copy of c] */ |
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103 for (; ix < olduse; ix++) { |
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104 *tmpb++ = 0; |
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105 } |
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106 } |
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107 mp_clamp (b); |
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108 return MP_OKAY; |
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109 } |
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110 #endif |
389
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111 |
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112 /* $Source: /cvs/libtom/libtommath/bn_fast_s_mp_sqr.c,v $ */ |
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113 /* $Revision: 1.3 $ */ |
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114 /* $Date: 2006/03/31 14:18:44 $ */ |