| 1 | /* |
| 2 | * libopenemv - a library to work with EMV family of smart cards |
| 3 | * Copyright (C) 2015 Dmitry Eremin-Solenikov |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #ifdef HAVE_CONFIG_H |
| 17 | #include <config.h> |
| 18 | #endif |
| 19 | |
| 20 | #include "crypto.h" |
| 21 | #include "crypto_backend.h" |
| 22 | |
| 23 | #include <string.h> |
| 24 | |
| 25 | static struct crypto_backend *crypto_backend; |
| 26 | |
| 27 | static bool crypto_init(void) |
| 28 | { |
| 29 | if (crypto_backend) |
| 30 | return true; |
| 31 | |
| 32 | crypto_backend = crypto_polarssl_init(); |
| 33 | |
| 34 | if (!crypto_backend) |
| 35 | return false; |
| 36 | |
| 37 | return true; |
| 38 | } |
| 39 | |
| 40 | struct crypto_hash *crypto_hash_open(enum crypto_algo_hash hash) |
| 41 | { |
| 42 | struct crypto_hash *ch; |
| 43 | |
| 44 | if (!crypto_init()) |
| 45 | return NULL; |
| 46 | |
| 47 | ch = crypto_backend->hash_open(hash); |
| 48 | if (ch) |
| 49 | ch->algo = hash; |
| 50 | |
| 51 | return ch; |
| 52 | } |
| 53 | |
| 54 | void crypto_hash_close(struct crypto_hash *ch) |
| 55 | { |
| 56 | ch->close(ch); |
| 57 | } |
| 58 | |
| 59 | void crypto_hash_write(struct crypto_hash *ch, const unsigned char *buf, size_t len) |
| 60 | { |
| 61 | ch->write(ch, buf, len); |
| 62 | } |
| 63 | |
| 64 | unsigned char *crypto_hash_read(struct crypto_hash *ch) |
| 65 | { |
| 66 | return ch->read(ch); |
| 67 | } |
| 68 | |
| 69 | size_t crypto_hash_get_size(const struct crypto_hash *ch) |
| 70 | { |
| 71 | return ch->get_size(ch); |
| 72 | } |
| 73 | |
| 74 | struct crypto_pk *crypto_pk_open(enum crypto_algo_pk pk, ...) |
| 75 | { |
| 76 | struct crypto_pk *cp; |
| 77 | va_list vl; |
| 78 | |
| 79 | if (!crypto_init()) |
| 80 | return NULL; |
| 81 | |
| 82 | va_start(vl, pk); |
| 83 | cp = crypto_backend->pk_open(pk, vl); |
| 84 | va_end(vl); |
| 85 | |
| 86 | if (cp) |
| 87 | cp->algo = pk; |
| 88 | |
| 89 | return cp; |
| 90 | } |
| 91 | |
| 92 | struct crypto_pk *crypto_pk_open_priv(enum crypto_algo_pk pk, ...) |
| 93 | { |
| 94 | struct crypto_pk *cp; |
| 95 | va_list vl; |
| 96 | |
| 97 | if (!crypto_init()) |
| 98 | return NULL; |
| 99 | |
| 100 | if (!crypto_backend->pk_open_priv) |
| 101 | return NULL; |
| 102 | |
| 103 | va_start(vl, pk); |
| 104 | cp = crypto_backend->pk_open_priv(pk, vl); |
| 105 | va_end(vl); |
| 106 | |
| 107 | if (cp) |
| 108 | cp->algo = pk; |
| 109 | |
| 110 | return cp; |
| 111 | } |
| 112 | |
| 113 | struct crypto_pk *crypto_pk_genkey(enum crypto_algo_pk pk, ...) |
| 114 | { |
| 115 | struct crypto_pk *cp; |
| 116 | va_list vl; |
| 117 | |
| 118 | if (!crypto_init()) |
| 119 | return NULL; |
| 120 | |
| 121 | if (!crypto_backend->pk_genkey) |
| 122 | return NULL; |
| 123 | |
| 124 | va_start(vl, pk); |
| 125 | cp = crypto_backend->pk_genkey(pk, vl); |
| 126 | va_end(vl); |
| 127 | |
| 128 | if (cp) |
| 129 | cp->algo = pk; |
| 130 | |
| 131 | return cp; |
| 132 | } |
| 133 | |
| 134 | void crypto_pk_close(struct crypto_pk *cp) |
| 135 | { |
| 136 | cp->close(cp); |
| 137 | } |
| 138 | |
| 139 | unsigned char *crypto_pk_encrypt(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen) |
| 140 | { |
| 141 | return cp->encrypt(cp, buf, len, clen); |
| 142 | } |
| 143 | |
| 144 | unsigned char *crypto_pk_decrypt(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen) |
| 145 | { |
| 146 | if (!cp->decrypt) { |
| 147 | *clen = 0; |
| 148 | |
| 149 | return NULL; |
| 150 | } |
| 151 | |
| 152 | return cp->decrypt(cp, buf, len, clen); |
| 153 | } |
| 154 | |
| 155 | enum crypto_algo_pk crypto_pk_get_algo(const struct crypto_pk *cp) |
| 156 | { |
| 157 | if (!cp) |
| 158 | return PK_INVALID; |
| 159 | |
| 160 | return cp->algo; |
| 161 | } |
| 162 | |
| 163 | size_t crypto_pk_get_nbits(const struct crypto_pk *cp) |
| 164 | { |
| 165 | if (!cp->get_nbits) |
| 166 | return 0; |
| 167 | |
| 168 | return cp->get_nbits(cp); |
| 169 | } |
| 170 | |
| 171 | unsigned char *crypto_pk_get_parameter(const struct crypto_pk *cp, unsigned param, size_t *plen) |
| 172 | { |
| 173 | *plen = 0; |
| 174 | |
| 175 | if (!cp->get_parameter) |
| 176 | return NULL; |
| 177 | |
| 178 | return cp->get_parameter(cp, param, plen); |
| 179 | } |