| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Parse group description strings |
| 4 | * |
| 5 | * (c) 2004 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include "group.h" |
| 31 | #include "dh.h" |
| 32 | |
| 33 | /*----- Main code ---------------------------------------------------------*/ |
| 34 | |
| 35 | /* --- @group_parse@ --- * |
| 36 | * |
| 37 | * Arguments: @qd_parse *qd@ = quick-and-dirty parser |
| 38 | * |
| 39 | * Returns: Group pointer, or null for failure. |
| 40 | * |
| 41 | * Use: Parses a group description and returns the group. This has |
| 42 | * the form `TYPE { SPEC }' where TYPE is `prime' or `ec', and |
| 43 | * SPEC is the appropriate kind of group specification of the |
| 44 | * given type. |
| 45 | */ |
| 46 | |
| 47 | group *group_parse(qd_parse *qd) |
| 48 | { |
| 49 | group *g = 0; |
| 50 | |
| 51 | switch (qd_enum(qd, "prime,bin,ec")) { |
| 52 | case 0: { |
| 53 | dh_param dp; |
| 54 | qd_delim(qd, '{'); |
| 55 | if (dh_parse(qd, &dp)) goto ouch; |
| 56 | qd_delim(qd, '}'); |
| 57 | g = group_prime(&dp); |
| 58 | dh_paramfree(&dp); |
| 59 | } break; |
| 60 | case 1: { |
| 61 | gbin_param dp; |
| 62 | qd_delim(qd, '{'); |
| 63 | if (dhbin_parse(qd, &dp)) goto ouch; |
| 64 | qd_delim(qd, '}'); |
| 65 | g = group_binary(&dp); |
| 66 | dh_paramfree(&dp); |
| 67 | } break; |
| 68 | case 2: { |
| 69 | ec_info ei; |
| 70 | qd_delim(qd, '{'); |
| 71 | if (ec_infoparse(qd, &ei)) goto ouch; |
| 72 | qd_delim(qd, '}'); |
| 73 | g = group_ec(&ei); |
| 74 | } break; |
| 75 | } |
| 76 | if (!g) qd->e = "bad group parameters"; |
| 77 | ouch: |
| 78 | return (g); |
| 79 | } |
| 80 | |
| 81 | /* --- @group_fromstring@ --- * |
| 82 | * |
| 83 | * Arguments: @const char *p@ = pointer to string to read |
| 84 | * @group **gg@ = where to put the group pointer |
| 85 | * |
| 86 | * Returns: Null if OK, or an error string. |
| 87 | * |
| 88 | * Use: Parses a group spec from a string, and returns the group. |
| 89 | */ |
| 90 | |
| 91 | const char *group_fromstring(const char *p, group **gg) |
| 92 | { |
| 93 | group *g; |
| 94 | qd_parse qd; |
| 95 | |
| 96 | qd.p = p; |
| 97 | qd.e = 0; |
| 98 | if ((g = group_parse(&qd)) == 0) return (qd.e); |
| 99 | if (!qd_eofp(&qd)) { G_DESTROYGROUP(g); return ("junk at end of string"); } |
| 100 | *gg = g; |
| 101 | return (0); |
| 102 | } |
| 103 | |
| 104 | /*----- That's all, folks -------------------------------------------------*/ |