hashfile: simple implementation

to be fixed to support stream reading

src/hashfile.cpp

@@ -0,0 +1,114 @@
+
+/*
+ * This file is part of Codecrypt.
+ *
+ * Codecrypt 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 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Codecrypt 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hashfile.h"
+
+#include <map>
+using namespace std;
+
+#include "sha_hash.h"
+#include "tiger_hash.h"
+#include "cube_hash.h"
+
+#include "iohelpers.h"
+
+/*
+ * helper -- size measurement is a hash as well
+ */
+
+class size64hash : public hash_func
+{
+	uint size() {
+		return 8;
+	}
+
+	std::vector<byte> operator() (const std::vector<byte>&a) {
+		uint64_t s = a.size();
+		std::vector<byte> r;
+		r.resize (8, 0);
+		for (int i = 0; i < 8; ++i) {
+			r[i] = s & 0xff;
+			s >>= 8;
+		}
+		return r;
+	}
+};
+
+/*
+ * list of hash functions availabel
+ */
+
+typedef map<string, hash_func*> hashmap;
+
+void fill_hashmap (hashmap&t)
+{
+#if HAVE_CRYPTOPP==1
+	static tiger192hash th;
+	t["TIGER192"] = &th;
+	static sha256hash sh256;
+	t["SHA256"] = &sh256;
+	static sha512hash sh512;
+	t["SHA512"] = &sh512;
+#endif //HAVE_CRYPTOPP
+	static cube512hash c512;
+	t["CUBE512"] = &c512;
+	static size64hash s;
+	t["SIZE64"] = &s;
+}
+
+bool hashfile::create (istream&in)
+{
+	hashes.clear();
+
+	/* TODO this should use streams, rewrite it. */
+
+	std::vector<byte> data;
+	if (!read_all_input (data, in) )
+		return false;
+
+	hashmap hm;
+	fill_hashmap (hm);
+
+	for (hashmap::iterator i = hm.begin(), e = hm.end(); i != e; ++i)
+		hashes[i->first] = (*i->second) (data);
+
+	return true;
+}
+
+int hashfile::verify (istream&in)
+{
+	std::vector<byte> data;
+	if (!read_all_input (data, in) ) return 1;
+
+	hashmap hm;
+	fill_hashmap (hm);
+
+	bool matched_one_hash = false;
+	for (hashmap::iterator i = hm.begin(), e = hm.end(); i != e; ++i) {
+
+		if (!hashes.count (i->first) ) continue;
+
+		if (hashes[i->first] != (*i->second) (data) )
+			return 3; //verification failed
+
+		matched_one_hash = true;
+	}
+
+	if (matched_one_hash) return 0; //all OK
+	else return 2; //more data needed.
+}

src/hashfile.h

@@ -0,0 +1,37 @@
+
+/*
+ * This file is part of Codecrypt.
+ *
+ * Codecrypt 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 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Codecrypt 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _ccr_hashfile_h_
+#define _ccr_hashfile_h_
+
+#include "types.h"
+#include <iostream>
+#include <string>
+#include <vector>
+#include <map>
+
+class hashfile
+{
+public:
+	std::map<std::string, std::vector<byte> > hashes;
+
+	bool create (std::istream&);
+	int verify (std::istream&);
+};
+
+#endif