twrpDigest refactor
This patch is to refactor twrpDigest using polymorphism
and inheritance to use the same call patterns for creating and
reading a digest. Now a library.
Use SHA2 from libcrypto. SHA2 is default if device has libcrypto.
Change string MD5 everywhere to use digest or Digest instead. Updated
string tags to digest. Translation will be required.
Switch out digest code into a driver class from partitionmanager.
SHA2 is better for digest creation due to decreased collision space
compared to MD5 and SHA1.
See https://en.wikipedia.org/wiki/SHA-2
Change-Id: I74b5546789990b12aa4ce2e389d25f80a3fe213f
diff --git a/twrpDigest/twrpMD5.hpp b/twrpDigest/twrpMD5.hpp
new file mode 100644
index 0000000..40cac18
--- /dev/null
+++ b/twrpDigest/twrpMD5.hpp
@@ -0,0 +1,42 @@
+/*
+ Copyright 2012 to 2017 TeamWin
+ This file is part of TWRP/TeamWin Recovery Project.
+
+ TWRP is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ TWRP 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with TWRP. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TWRPMD5_H
+#define __TWRPMD5_H
+
+#include <string>
+#include "twrpDigest.hpp"
+
+extern "C" {
+ #include "digest/md5/md5.h"
+}
+
+class twrpMD5: public twrpDigest {
+public:
+ twrpMD5(); // Stream initializer
+ void init(); // Initialize MD5 structures
+ void update(const unsigned char* stream, size_t len); // Update MD5 stream with data. Return false if failure to update MD5.
+ std::string return_digest_string(); // Return MD5 digest as string to callee
+ void finalize(); // Finalize and compute MD5
+
+private:
+ struct MD5Context md5c; // MD5 control structure
+ unsigned char md5sum[MD5LENGTH]; // Stores the md5sum computation
+};
+
+#endif //__TWRPMD5_H