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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: limlee.h,v 1.2 2000/08/18 19:16:51 mdw Exp $ |
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4 | * |
5 | * Generate Lim-Lee primes |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: limlee.h,v $ |
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33 | * Revision 1.2 2000/08/18 19:16:51 mdw |
34 | * New stepper interface for constructing Lim-Lee primes. |
35 | * |
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36 | * Revision 1.1 2000/07/09 21:30:58 mdw |
37 | * Lim-Lee prime generation. |
38 | * |
39 | */ |
40 | |
41 | #ifndef CATACOMB_LIMLEE_H |
42 | #define CATACOMB_LIMLEE_H |
43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
50 | #ifndef CATACOMB_GRAND_H |
51 | # include "grand.h" |
52 | #endif |
53 | |
54 | #ifndef CATACOMB_MP_H |
55 | # include "mp.h" |
56 | #endif |
57 | |
58 | #ifndef CATACOMB_PGEN_H |
59 | # include "pgen.h" |
60 | #endif |
61 | |
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62 | /*----- Data structures ---------------------------------------------------*/ |
63 | |
64 | typedef struct limlee_factor { |
65 | mp *p; /* The actual prime */ |
66 | unsigned tag; /* A tag, usable by the generator */ |
67 | void *more; /* Pointer to more data */ |
68 | } limlee_factor; |
69 | |
70 | typedef struct limlee_stepctx { |
71 | |
72 | /* --- To be initialized by the caller --- */ |
73 | |
74 | unsigned f; /* Various useful flags */ |
75 | mp *newp; /* Initial valid for new primes */ |
76 | unsigned ql, pl; /* Size of factors and result */ |
77 | const struct limlee_primeops *pops; /* Pointer to generator ops */ |
78 | void *pc; /* Context ptr for generator ops */ |
79 | pgen_proc *iev; /* Event handler for inner @pgen@ */ |
80 | void *iec; /* Context for inner @pgen@ */ |
81 | |
82 | /* --- Output values --- */ |
83 | |
84 | size_t nf; /* Number of factors wanted */ |
85 | limlee_factor *v; /* Vector of factors */ |
86 | |
87 | /* --- Maintained internally --- */ |
88 | |
89 | octet *c; /* Combination byte-flag vector */ |
90 | grand *r; /* Random number generator */ |
91 | unsigned long seq; /* Sequence number for primes */ |
92 | size_t poolsz; /* Size of the small-prime pool */ |
93 | dstr d; /* String for subprime name */ |
94 | limlee_factor qq; /* Big prime to pick up slack */ |
95 | |
96 | } limlee_stepctx; |
97 | |
98 | typedef struct limlee_primeops { |
99 | void (*pgen)(limlee_factor */*f*/, unsigned /*pl*/, limlee_stepctx */*l*/); |
100 | void (*pfree)(limlee_factor */*f*/, limlee_stepctx */*l*/); |
101 | } limlee_primeops; |
102 | |
103 | /* --- Flags --- */ |
104 | |
105 | enum { |
106 | LIMLEE_KEEPFACTORS = 1 |
107 | }; |
108 | |
109 | /*----- The Lim-Lee stepper function --------------------------------------*/ |
110 | |
111 | extern int limlee_step(int /*rq*/, pgen_event */*ev*/, void */*p*/); |
112 | |
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113 | /*----- Functions provided ------------------------------------------------*/ |
114 | |
115 | /* --- @limlee@ --- * |
116 | * |
117 | * Arguments: @const char *name@ = pointer to name root |
118 | * @mp *d@ = pointer to destination integer |
119 | * @mp *newp@ = how to generate factor primes |
120 | * @unsigned ql@ = size of individual factors |
121 | * @unsigned pl@ = size of large prime |
122 | * @grand *r@ = a random number source |
123 | * @unsigned on@ = number of outer attempts to make |
124 | * @pgen_proc *oev@ = outer event handler function |
125 | * @void *oec@ = argument for the outer event handler |
126 | * @pgen_proc *iev@ = inner event handler function |
127 | * @void *iec@ = argument for the inner event handler |
128 | * @size_t *nf@, @mp ***f@ = output array for factors |
129 | * |
130 | * Returns: A Lim-Lee prime, or null if generation failed. |
131 | * |
132 | * Use: Generates Lim-Lee primes. A Lim-Lee prime %$p$% is one which |
133 | * satisfies %$p = 2 \prod_i q_i + 1$%, where all of the %$q_i$% |
134 | * are large enough to resist square-root discrete log |
135 | * algorithms. |
136 | * |
137 | * If we succeed, and @f@ is non-null, we write the array of |
138 | * factors chosen to @f@ for the benefit of the caller. |
139 | */ |
140 | |
141 | extern mp *limlee(const char */*name*/, mp */*d*/, mp */*newp*/, |
142 | unsigned /*ql*/, unsigned /*pl*/, grand */*r*/, |
143 | unsigned /*on*/, pgen_proc */*oev*/, void */*oec*/, |
144 | pgen_proc */*iev*/, void */*iec*/, |
145 | size_t */*nf*/, mp ***/*f*/); |
146 | |
147 | /*----- That's all, folks -------------------------------------------------*/ |
148 | |
149 | #ifdef __cplusplus |
150 | } |
151 | #endif |
152 | |
153 | #endif |