| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: rsa.h,v 1.1 1999/12/22 15:50:45 mdw Exp $ |
| 4 | * |
| 5 | * The RSA public-key cryptosystem |
| 6 | * |
| 7 | * (c) 1999 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: rsa.h,v $ |
| 33 | * Revision 1.1 1999/12/22 15:50:45 mdw |
| 34 | * Initial RSA support. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | #ifndef CATACOMB_RSA_H |
| 39 | #define CATACOMB_RSA_H |
| 40 | |
| 41 | #ifdef __cplusplus |
| 42 | extern "C" { |
| 43 | #endif |
| 44 | |
| 45 | /*----- Header files ------------------------------------------------------*/ |
| 46 | |
| 47 | #ifndef CATACOMB_GRAND_H |
| 48 | # include "grand.h" |
| 49 | #endif |
| 50 | |
| 51 | #ifndef CATACOMB_MP_H |
| 52 | # include "mp.h" |
| 53 | #endif |
| 54 | |
| 55 | #ifndef CATACOMB_PGEN_H |
| 56 | # include "pgen.h" |
| 57 | #endif |
| 58 | |
| 59 | /*----- Data structures ---------------------------------------------------*/ |
| 60 | |
| 61 | typedef struct rsa_param { |
| 62 | mp *p, *q; |
| 63 | mp *n; |
| 64 | mp *q_inv; |
| 65 | mp *e, *d, *dp, *dq; |
| 66 | } rsa_param; |
| 67 | |
| 68 | /*----- Functions provided ------------------------------------------------*/ |
| 69 | |
| 70 | /* --- @rsa_gen@ --- * |
| 71 | * |
| 72 | * Arguments: @rsa_param *rp@ = pointer to block to be filled in |
| 73 | * @unsigned nbits@ = required modulus size in bits |
| 74 | * @grand *r@ = random number source |
| 75 | * @unsigned n@ = number of attempts to make |
| 76 | * @pgen_proc *event@ = event handler function |
| 77 | * @void *ectx@ = argument for the event handler |
| 78 | * |
| 79 | * Returns: Zero if all went well, nonzero otherwise. |
| 80 | * |
| 81 | * Use: Constructs a pair of strong RSA primes and other useful RSA |
| 82 | * parameters. A small encryption exponent is chosen if |
| 83 | * possible. |
| 84 | */ |
| 85 | |
| 86 | extern int rsa_gen(rsa_param */*rp*/, unsigned /*nbits*/, |
| 87 | grand */*r*/, unsigned /*n*/, |
| 88 | pgen_proc */*event*/, void */*ectx*/); |
| 89 | |
| 90 | /* --- @rsa_decrypt@ --- * |
| 91 | * |
| 92 | * Arguments: @rsa_param *rp@ = pointer to RSA parameters |
| 93 | * @mp *d@ = destination |
| 94 | * @mp *c@ = ciphertext message |
| 95 | * @grand *r@ = pointer to random number source for blinding |
| 96 | * |
| 97 | * Returns: Correctly decrypted message. |
| 98 | * |
| 99 | * Use: Performs RSA decryption, very carefully. |
| 100 | */ |
| 101 | |
| 102 | extern mp *rsa_decrypt(rsa_param */*rp*/, mp */*d*/, mp */*c*/, |
| 103 | grand */*r*/); |
| 104 | |
| 105 | /* --- @rsa_recover@ --- * |
| 106 | * |
| 107 | * Arguments: @rsa_param *rp@ = pointer to parameter block |
| 108 | * |
| 109 | * Returns: Zero if all went well, nonzero if the parameters make no |
| 110 | * sense. |
| 111 | * |
| 112 | * Use: Derives the full set of RSA parameters given a minimal set. |
| 113 | */ |
| 114 | |
| 115 | extern int rsa_recover(rsa_param */*rp*/); |
| 116 | |
| 117 | /*----- That's all, folks -------------------------------------------------*/ |
| 118 | |
| 119 | #ifdef __cplusplus |
| 120 | } |
| 121 | #endif |
| 122 | |
| 123 | #endif |