proxmark3/client/emv/crypto.c

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/*
* libopenemv - a library to work with EMV family of smart cards
* Copyright (C) 2015 Dmitry Eremin-Solenikov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "crypto.h"
#include "crypto_backend.h"
static struct crypto_backend *crypto_backend;
static bool crypto_init(void) {
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if (crypto_backend)
return true;
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crypto_backend = crypto_polarssl_init();
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if (!crypto_backend)
return false;
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return true;
}
struct crypto_hash *crypto_hash_open(enum crypto_algo_hash hash) {
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struct crypto_hash *ch;
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if (!crypto_init())
return NULL;
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ch = crypto_backend->hash_open(hash);
if (ch)
ch->algo = hash;
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return ch;
}
void crypto_hash_close(struct crypto_hash *ch) {
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ch->close(ch);
}
void crypto_hash_write(struct crypto_hash *ch, const unsigned char *buf, size_t len) {
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ch->write(ch, buf, len);
}
unsigned char *crypto_hash_read(struct crypto_hash *ch) {
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return ch->read(ch);
}
size_t crypto_hash_get_size(const struct crypto_hash *ch) {
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return ch->get_size(ch);
}
struct crypto_pk *crypto_pk_open(enum crypto_algo_pk pk, ...) {
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struct crypto_pk *cp;
va_list vl;
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if (!crypto_init())
return NULL;
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va_start(vl, pk);
cp = crypto_backend->pk_open(pk, vl);
va_end(vl);
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if (cp)
cp->algo = pk;
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return cp;
}
struct crypto_pk *crypto_pk_open_priv(enum crypto_algo_pk pk, ...) {
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struct crypto_pk *cp;
va_list vl;
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if (!crypto_init())
return NULL;
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if (!crypto_backend->pk_open_priv)
return NULL;
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va_start(vl, pk);
cp = crypto_backend->pk_open_priv(pk, vl);
va_end(vl);
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if (cp)
cp->algo = pk;
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return cp;
}
struct crypto_pk *crypto_pk_genkey(enum crypto_algo_pk pk, ...) {
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struct crypto_pk *cp;
va_list vl;
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if (!crypto_init())
return NULL;
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if (!crypto_backend->pk_genkey)
return NULL;
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va_start(vl, pk);
cp = crypto_backend->pk_genkey(pk, vl);
va_end(vl);
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if (cp)
cp->algo = pk;
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return cp;
}
void crypto_pk_close(struct crypto_pk *cp) {
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cp->close(cp);
}
unsigned char *crypto_pk_encrypt(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen) {
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return cp->encrypt(cp, buf, len, clen);
}
unsigned char *crypto_pk_decrypt(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen) {
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if (!cp->decrypt) {
*clen = 0;
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return NULL;
}
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return cp->decrypt(cp, buf, len, clen);
}
enum crypto_algo_pk crypto_pk_get_algo(const struct crypto_pk *cp) {
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if (!cp)
return PK_INVALID;
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return cp->algo;
}
size_t crypto_pk_get_nbits(const struct crypto_pk *cp) {
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if (!cp->get_nbits)
return 0;
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return cp->get_nbits(cp);
}
unsigned char *crypto_pk_get_parameter(const struct crypto_pk *cp, unsigned param, size_t *plen) {
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*plen = 0;
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if (!cp->get_parameter)
return NULL;
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return cp->get_parameter(cp, param, plen);
}