client/src/emv/crypto_backend.h

   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 #ifndef CRYPTO_BACKEND_H
  17 #define CRYPTO_BACKEND_H
  18
  19 #include "crypto.h"
  20
  21 #include <stdarg.h>  // va_list
  22
  23 struct crypto_hash {
  24     enum crypto_algo_hash algo;
  25     void (*write)(struct crypto_hash *ch, const unsigned char *buf, size_t len);
  26     unsigned char *(*read)(struct crypto_hash *ch);
  27     void (*close)(struct crypto_hash *ch);
  28     size_t (*get_size)(const struct crypto_hash *ch);
  29 };
  30
  31 struct crypto_pk {
  32     enum crypto_algo_pk algo;
  33     unsigned char *(*encrypt)(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen);
  34     unsigned char *(*decrypt)(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen);
  35     unsigned char *(*get_parameter)(const struct crypto_pk *cp, unsigned param, size_t *plen);
  36     size_t (*get_nbits)(const struct crypto_pk *cp);
  37     void (*close)(struct crypto_pk *cp);
  38 };
  39
  40 struct crypto_backend {
  41     struct crypto_hash *(*hash_open)(enum crypto_algo_hash hash);
  42     struct crypto_pk *(*pk_open)(enum crypto_algo_pk pk, va_list vl);
  43     struct crypto_pk *(*pk_open_priv)(enum crypto_algo_pk pk, va_list vl);
  44     struct crypto_pk *(*pk_genkey)(enum crypto_algo_pk pk, va_list vl);
  45 };
  46
  47 struct crypto_backend *crypto_polarssl_init(void);
  48
  49 #endif