use md5.c for computation of md5sums

create a framework for computing digests and reading digests in TWRP
add space for backwards compatibility with bb md5sum
Change-Id: Ia18e3f430eed5eba22e5052d39b9b8d88ecd4536

twrpDigest.cpp

@@ -0,0 +1,112 @@
+/*
+	Copyright 2012 bigbiff/Dees_Troy 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/>.
+*/
+
+extern "C" {
+	#include "digest/md5.h"
+	#include "libcrecovery/common.h"
+}
+#include <vector>
+#include <string>
+#include <sstream>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <libgen.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <dirent.h>
+#include <sys/mman.h>
+#include "common.h"
+#include "data.hpp"
+#include "variables.h"
+#include "twrp-functions.hpp"
+#include "twrpDigest.hpp"
+
+using namespace std;
+
+void twrpDigest::setfn(string fn) {
+	md5fn = fn;
+}
+
+int twrpDigest::computeMD5(void) {
+	string line;
+	struct MD5Context md5c;
+	FILE *file;
+	int len;
+	unsigned char buf[1024];
+	MD5Init(&md5c);
+	file = fopen(md5fn.c_str(), "rb");
+	if (file == NULL)
+		return -1;
+	while ((len = fread(buf, 1, sizeof(buf), file)) > 0) {
+		MD5Update(&md5c, buf, len);
+	}
+	MD5Final(md5sum ,&md5c);
+	return 0;
+}
+
+int twrpDigest::write_md5digest(void) {
+	int i;
+	string md5string, md5file;
+	char hex[3];
+	md5file = md5fn + ".md5";
+
+	for (i = 0; i < 16; ++i) {
+		snprintf(hex, 3 ,"%02x", md5sum[i]);
+		md5string += hex;
+	}
+	md5string += "  ";
+	md5string += basename((char*) md5fn.c_str());
+	md5string +=  + "\n";
+	TWFunc::write_file(md5file, md5string);
+	return 0;
+}
+
+int twrpDigest::read_md5digest(void) {
+	string md5file = md5fn + ".md5";
+	if (TWFunc::read_file(md5file, lines) != 0)
+		return -1;
+	return 0;
+}
+
+int twrpDigest::verify_md5digest(void) {
+	string buf;
+	char hex[3];
+	int i;
+	string md5string;
+
+	if (read_md5digest() != 0)
+		return -1;
+	stringstream ss(lines.at(0));
+	vector<string> tokens;
+	while (ss >> buf)
+		tokens.push_back(buf);
+	computeMD5();
+	for (i = 0; i < 16; ++i) {
+		snprintf(hex, 3, "%02x", md5sum[i]);
+		md5string += hex;
+	}
+	if (tokens.at(0) != md5string)
+		return -2;
+	return 0;
+}