| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: oaep.h,v 1.1 2000/07/01 11:18:30 mdw Exp $ |
| 4 | * |
| 5 | * Optimal asymmetric encryption packing |
| 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: oaep.h,v $ |
| 33 | * Revision 1.1 2000/07/01 11:18:30 mdw |
| 34 | * Support for Optimal Asymmetric Encryption Padding. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Notes on OAEP -----------------------------------------------------* |
| 39 | * |
| 40 | * Applying OAEP before RSA encryption renders the construction plaintext- |
| 41 | * aware under the random oracle model. This is probably a good thing. OAEP |
| 42 | * was designed by Bellare and Rogaway. This particular variant is the one |
| 43 | * specified in PKCS#1 version 2.0. It's apparently not compatible with the |
| 44 | * OAEP used in the SET protocols. |
| 45 | */ |
| 46 | |
| 47 | #ifndef CATACOMB_OAEP_H |
| 48 | #define CATACOMB_OAEP_H |
| 49 | |
| 50 | #ifdef __cplusplus |
| 51 | extern "C" { |
| 52 | #endif |
| 53 | |
| 54 | /*----- Header files ------------------------------------------------------*/ |
| 55 | |
| 56 | #include <mLib/bits.h> |
| 57 | #include <mLib/dstr.h> |
| 58 | |
| 59 | #ifndef CATACOMB_GCIPHER_H |
| 60 | # include "gcipher.h" |
| 61 | #endif |
| 62 | |
| 63 | #ifndef CATACOMB_GHASH_H |
| 64 | # include "ghash.h" |
| 65 | #endif |
| 66 | |
| 67 | #ifndef CATACOMB_GRAND_H |
| 68 | # include "grand.h" |
| 69 | #endif |
| 70 | |
| 71 | /*----- Data structures ---------------------------------------------------*/ |
| 72 | |
| 73 | typedef struct oaep { |
| 74 | const gccipher *cc; /* Cipher class for masking */ |
| 75 | const gchash *ch; /* Hash class for parameter block */ |
| 76 | grand *r; /* Random number source */ |
| 77 | const void *ep; /* Encoding parameters block */ |
| 78 | size_t epsz; /* Size of the parameter block */ |
| 79 | } oaep; |
| 80 | |
| 81 | /*----- Functions provided ------------------------------------------------*/ |
| 82 | |
| 83 | /* --- @oaep_encode@ --- * |
| 84 | * |
| 85 | * Arguments: @const void *msg@ = pointer to message data |
| 86 | * @size_t msz@ = size of message data |
| 87 | * @void *buf@ = pointer to output buffer |
| 88 | * @size_t sz@ = size of the output buffer |
| 89 | * @void *p@ = pointer to OAEP parameter block |
| 90 | * |
| 91 | * Returns: Zero if all went well, negative on failure. |
| 92 | * |
| 93 | * Use: Implements the operation @EME-OAEP-ENCODE@, as defined in |
| 94 | * PKCS#1 v. 2.0 (RFC2437). |
| 95 | */ |
| 96 | |
| 97 | extern int oaep_encode(const void */*msg*/, size_t /*msz*/, |
| 98 | void */*buf*/, size_t /*sz*/, void */*p*/); |
| 99 | |
| 100 | /* --- @oaep_decode@ --- * |
| 101 | * |
| 102 | * Arguments: @const void *buf@ = pointer to encoded buffer |
| 103 | * @size_t sz@ = size of the encoded buffer |
| 104 | * @dstr *d@ = pointer to destination string |
| 105 | * @void *p@ = pointer to OAEP parameter block |
| 106 | * |
| 107 | * Returns: The length of the output string if successful, negative on |
| 108 | * failure. |
| 109 | * |
| 110 | * Use: Implements the operation @EME-OAEP-DECODE@, as defined in |
| 111 | * PKCS#1 v. 2.0 (RFC2437). |
| 112 | */ |
| 113 | |
| 114 | extern int oaep_decode(const void */*buf*/, size_t /*sz*/, |
| 115 | dstr */*d*/, void */*p*/); |
| 116 | |
| 117 | /*----- That's all, folks -------------------------------------------------*/ |
| 118 | |
| 119 | #ifdef __cplusplus |
| 120 | } |
| 121 | #endif |
| 122 | |
| 123 | #endif |