add forgotten seclock files

whew boy.

src/seclock.cpp

@@ -0,0 +1,116 @@
+
+/*
+ * This file is part of Codecrypt.
+ *
+ * Copyright (C) 2013-2017 Mirek Kratochvil <exa.exa@gmail.com>
+ *
+ * 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 "seclock.h"
+
+#include "pwrng.h"
+#include "iohelpers.h"
+
+#include <sstream>
+#include <string>
+
+#include <stdlib.h>
+
+#define LOCKED_PREFIX "ccr_lock"
+#define LOCKED_PREFIX_LEN 8
+
+bool looks_like_locked_secret (const std::string&s)
+{
+	std::string prefix = LOCKED_PREFIX;
+	/*
+	 * unlocked version of this thing is always some kind of sencode, which
+	 * will never start with 'ccr_lock'. Abusing it right here.
+	 */
+	return s.length() > LOCKED_PREFIX_LEN
+	       && s.substr (0, LOCKED_PREFIX_LEN) == LOCKED_PREFIX;
+}
+
+bool load_lock_secret (symkey&sk,
+                       std::string withlock,
+                       const std::string &reason,
+                       const std::string &secret_type,
+                       bool for_locking)
+{
+	if (withlock == "") withlock = "@"; //default for password
+	if (withlock[0] == '@') {
+		//ask the user and generate a symmetric key
+		pw_rng r;
+		r.init();
+		if (!r.seed_from_user_password
+		    ( (for_locking ? "locking " : "unlocking ") + reason,
+		      "CCR_" + secret_type + "_PASSWORD",
+		      for_locking))
+			return false;
+
+		withlock.erase (0, 1); //delete the @
+		if (withlock.empty()) {
+			std::string alg = "CCR_" + secret_type + "_ALGORITHM";
+			const char* algorithm = getenv (alg.c_str());
+			if (algorithm) withlock = algorithm;
+			else withlock = "CHACHA20,CUBE512,SHORTBLOCK";
+			//TODO make sure this is synced with synonyms
+		}
+		return sk.create (withlock, r);
+	} else {
+		return sk.load (withlock, "", false, false);
+	}
+}
+
+bool lock_secret (const std::string &secret, std::string &locked,
+                  const std::string &withlock,
+                  const std::string &reason,
+                  const std::string &secret_type,
+                  prng&rng)
+{
+
+	symkey sk;
+	if (!load_lock_secret (sk, withlock, reason, secret_type, true))
+		return false;
+
+	std::istringstream i (secret);
+	std::ostringstream o;
+	o << LOCKED_PREFIX;
+	bool ret = sk.encrypt (i, o, rng);
+	locked = o.str();
+	return ret;
+}
+
+bool unlock_secret (const std::string &locked, std::string &secret,
+                    const std::string &withlock,
+                    const std::string &reason,
+                    const std::string &secret_type)
+{
+	symkey sk;
+	if (!looks_like_locked_secret (locked)) {
+		err ("seclock: malformed locked secret");
+		return false;
+	}
+
+	if (!load_lock_secret (sk, withlock, reason, secret_type, false))
+		return false;
+
+
+	std::istringstream i (locked);
+	i.ignore (LOCKED_PREFIX_LEN);
+	std::ostringstream o;
+	bool ret = !sk.decrypt (i, o); //returns int!
+	secret = o.str();
+	return ret;
+}

src/seclock.h

@@ -0,0 +1,45 @@
+
+/*
+ * This file is part of Codecrypt.
+ *
+ * Copyright (C) 2013-2016 Mirek Kratochvil <exa.exa@gmail.com>
+ *
+ * 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_seclock_h_
+#define _ccr_seclock_h_
+
+#include <string>
+
+#include "prng.h"
+#include "symkey.h"
+
+bool looks_like_locked_secret (const std::string&);
+bool load_lock_secret (symkey&sk,
+                       std::string withlock,
+                       const std::string &reason,
+                       const std::string &secret_type,
+                       bool for_locking);
+bool lock_secret (const std::string&secret, std::string&locked,
+                  const std::string&withlock,
+                  const std::string&reason,
+                  const std::string&secret_type,
+                  prng&rng);
+bool unlock_secret (const std::string&locked, std::string&secret,
+                    const std::string&withlock,
+                    const std::string&reason,
+                    const std::string&secret_type);
+
+#endif