chg: 'hf emv' changes from @merlokk EMV4 commit

client/emv/crypto.c

@@ -0,0 +1,179 @@
+/*
+ * 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"
+
+#include <string.h>
+
+static struct crypto_backend *crypto_backend;
+
+static bool crypto_init(void)
+{
+	if (crypto_backend)
+		return true;
+
+	crypto_backend = crypto_polarssl_init(); 
+
+	if (!crypto_backend)
+		return false;
+
+	return true;
+}
+
+struct crypto_hash *crypto_hash_open(enum crypto_algo_hash hash)
+{
+	struct crypto_hash *ch;
+
+	if (!crypto_init())
+		return NULL;
+
+	ch = crypto_backend->hash_open(hash);
+	if (ch)
+		ch->algo = hash;
+
+	return ch;
+}
+
+void crypto_hash_close(struct crypto_hash *ch)
+{
+	ch->close(ch);
+}
+
+void crypto_hash_write(struct crypto_hash *ch, const unsigned char *buf, size_t len)
+{
+	ch->write(ch, buf, len);
+}
+
+unsigned char *crypto_hash_read(struct crypto_hash *ch)
+{
+	return ch->read(ch);
+}
+
+size_t crypto_hash_get_size(const struct crypto_hash *ch)
+{
+	return ch->get_size(ch);
+}
+
+struct crypto_pk *crypto_pk_open(enum crypto_algo_pk pk, ...)
+{
+	struct crypto_pk *cp;
+	va_list vl;
+
+	if (!crypto_init())
+		return NULL;
+
+	va_start(vl, pk);
+	cp = crypto_backend->pk_open(pk, vl);
+	va_end(vl);
+
+	if (cp)
+		cp->algo = pk;
+
+	return cp;
+}
+
+struct crypto_pk *crypto_pk_open_priv(enum crypto_algo_pk pk, ...)
+{
+	struct crypto_pk *cp;
+	va_list vl;
+
+	if (!crypto_init())
+		return NULL;
+
+	if (!crypto_backend->pk_open_priv)
+		return NULL;
+
+	va_start(vl, pk);
+	cp = crypto_backend->pk_open_priv(pk, vl);
+	va_end(vl);
+
+	if (cp)
+		cp->algo = pk;
+
+	return cp;
+}
+
+struct crypto_pk *crypto_pk_genkey(enum crypto_algo_pk pk, ...)
+{
+	struct crypto_pk *cp;
+	va_list vl;
+
+	if (!crypto_init())
+		return NULL;
+
+	if (!crypto_backend->pk_genkey)
+		return NULL;
+
+	va_start(vl, pk);
+	cp = crypto_backend->pk_genkey(pk, vl);
+	va_end(vl);
+
+	if (cp)
+		cp->algo = pk;
+
+	return cp;
+}
+
+void crypto_pk_close(struct crypto_pk *cp)
+{
+	cp->close(cp);
+}
+
+unsigned char *crypto_pk_encrypt(const struct crypto_pk *cp, const unsigned char *buf, size_t len, size_t *clen)
+{
+	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)
+{
+	if (!cp->decrypt) {
+		*clen = 0;
+
+		return NULL;
+	}
+
+	return cp->decrypt(cp, buf, len, clen);
+}
+
+enum crypto_algo_pk crypto_pk_get_algo(const struct crypto_pk *cp)
+{
+	if (!cp)
+		return PK_INVALID;
+
+	return cp->algo;
+}
+
+size_t crypto_pk_get_nbits(const struct crypto_pk *cp)
+{
+	if (!cp->get_nbits)
+		return 0;
+
+	return cp->get_nbits(cp);
+}
+
+unsigned char *crypto_pk_get_parameter(const struct crypto_pk *cp, unsigned param, size_t *plen)
+{
+	*plen = 0;
+
+	if (!cp->get_parameter)
+		return NULL;
+
+	return cp->get_parameter(cp, param, plen);
+}