Mercurial > dropbear
annotate libtommath/bn_fast_s_mp_mul_digs.c @ 1653:76189c9ffea2
External Public-Key Authentication API (#72)
* Implemented dynamic loading of an external plug-in shared library to delegate public key authentication
* Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled
* Added tags file to the ignore list
* Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them
* Added -rdynamic to the linker flags when EPKA is enabled
* Changed the API to pass a previously created session to the checkPubKey function (created during preauth)
* Added documentation to the API
* Added parameter addrstring to plugin creation function
* Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session)
* Changed option string to be a simple char * instead of unsigned char *
author | fabriziobertocci <fabriziobertocci@gmail.com> |
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date | Wed, 15 May 2019 09:43:57 -0400 |
parents | c8c20fb57a9a |
children | f52919ffd3b1 |
rev | line source |
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1436 | 1 #include <tommath_private.h> |
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2 #ifdef BN_FAST_S_MP_MUL_DIGS_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 * |
1436 | 15 * Tom St Denis, [email protected], http://libtom.org |
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16 */ |
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17 |
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18 /* Fast (comba) multiplier |
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19 * |
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20 * This is the fast column-array [comba] multiplier. It is |
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21 * designed to compute the columns of the product first |
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22 * then handle the carries afterwards. This has the effect |
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23 * of making the nested loops that compute the columns very |
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24 * simple and schedulable on super-scalar processors. |
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25 * |
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26 * This has been modified to produce a variable number of |
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27 * digits of output so if say only a half-product is required |
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28 * you don't have to compute the upper half (a feature |
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29 * required for fast Barrett reduction). |
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30 * |
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31 * Based on Algorithm 14.12 on pp.595 of HAC. |
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32 * |
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33 */ |
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34 int fast_s_mp_mul_digs (mp_int * a, mp_int * b, mp_int * c, int digs) |
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35 { |
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36 int olduse, res, pa, ix, iz; |
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37 mp_digit W[MP_WARRAY]; |
1436 | 38 mp_word _W; |
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39 |
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40 /* grow the destination as required */ |
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41 if (c->alloc < digs) { |
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42 if ((res = mp_grow (c, digs)) != MP_OKAY) { |
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43 return res; |
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44 } |
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45 } |
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46 |
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47 /* number of output digits to produce */ |
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48 pa = MIN(digs, a->used + b->used); |
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49 |
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50 /* clear the carry */ |
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51 _W = 0; |
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52 for (ix = 0; ix < pa; ix++) { |
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53 int tx, ty; |
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54 int iy; |
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55 mp_digit *tmpx, *tmpy; |
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56 |
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57 /* get offsets into the two bignums */ |
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58 ty = MIN(b->used-1, ix); |
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59 tx = ix - ty; |
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60 |
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61 /* setup temp aliases */ |
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62 tmpx = a->dp + tx; |
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63 tmpy = b->dp + ty; |
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64 |
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65 /* this is the number of times the loop will iterrate, essentially |
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66 while (tx++ < a->used && ty-- >= 0) { ... } |
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67 */ |
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68 iy = MIN(a->used-tx, ty+1); |
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69 |
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70 /* execute loop */ |
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71 for (iz = 0; iz < iy; ++iz) { |
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72 _W += ((mp_word)*tmpx++)*((mp_word)*tmpy--); |
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73 |
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74 } |
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75 |
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76 /* store term */ |
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77 W[ix] = ((mp_digit)_W) & MP_MASK; |
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78 |
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79 /* make next carry */ |
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80 _W = _W >> ((mp_word)DIGIT_BIT); |
1436 | 81 } |
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82 |
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83 /* setup dest */ |
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84 olduse = c->used; |
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85 c->used = pa; |
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86 |
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87 { |
1436 | 88 mp_digit *tmpc; |
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89 tmpc = c->dp; |
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90 for (ix = 0; ix < pa; ix++) { |
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91 /* now extract the previous digit [below the carry] */ |
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92 *tmpc++ = W[ix]; |
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93 } |
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94 |
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95 /* clear unused digits [that existed in the old copy of c] */ |
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96 for (; ix < olduse; ix++) { |
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97 *tmpc++ = 0; |
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98 } |
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99 } |
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100 mp_clamp (c); |
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101 return MP_OKAY; |
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102 } |
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103 #endif |
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104 |
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105 /* ref: $Format:%D$ */ |
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106 /* git commit: $Format:%H$ */ |
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107 /* commit time: $Format:%ai$ */ |