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use md5.c for computation of md5sums

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create a framework for computing digests and reading digests in TWRP
add space for backwards compatibility with bb md5sum
Change-Id: Ia18e3f430eed5eba22e5052d39b9b8d88ecd4536
This commit is contained in:
bigbiff bigbiff
2013-02-27 21:11:26 -05:00
parent 3578701315
commit cdcfee48b9
10 changed files with 488 additions and 64 deletions
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1
Android.mk
View File

@@ -27,6 +27,7 @@ LOCAL_SRC_FILES := \
verifier.cpp \
fixPermissions.cpp \
twrpTar.cpp \
twrpDigest.cpp \
adb_install.cpp
LOCAL_SRC_FILES += \

257
digest/md5.c Normal file
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@@ -0,0 +1,257 @@
/*
* This code implements the MD5 message-digest algorithm.
* The algorithm is due to Ron Rivest. This code was
* written by Colin Plumb in 1993, no copyright is claimed.
* This code is in the public domain; do with it what you wish.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*
* To compute the message digest of a chunk of bytes, declare an
* MD5Context structure, pass it to MD5Init, call MD5Update as
* needed on buffers full of bytes, and then call MD5Final, which
* will fill a supplied 16-byte array with the digest.
*/
#include <string.h> /* for memcpy() */
#include "md5.h"
#if !defined(WORDS_BIGENDIAN)
#define byteReverse(buf, len) /* Nothing */
#else
void byteReverse(unsigned char *buf, unsigned longs);
#ifndef ASM_MD5
/*
* Note: this code is harmless on little-endian machines.
*/
void byteReverse(unsigned char *buf, unsigned longs)
{
uint32_t t;
do {
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32_t *) buf = t;
buf += 4;
} while (--longs);
}
#endif
#endif
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
void MD5Init(struct MD5Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
{
uint32_t t;
/* Update bitcount */
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++; /* Carry from low to high */
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
/* Handle any leading odd-sized chunks */
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += t;
len -= t;
}
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void MD5Final(unsigned char digest[MD5LENGTH], struct MD5Context *ctx)
{
unsigned count;
unsigned char *p;
/* Compute number of bytes mod 64 */
count = (ctx->bits[0] >> 3) & 0x3F;
/* Set the first char of padding to 0x80. This is safe since there is
always at least one byte free */
p = ctx->in + count;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - count;
/* Pad out to 56 mod 64 */
if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
/* Now fill the next block with 56 bytes */
memset(ctx->in, 0, 56);
} else {
/* Pad block to 56 bytes */
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
/* Append length in bits and transform.
* Use memcpy to avoid aliasing problems. On most systems,
* this will be optimized away to the same code.
*/
memcpy(&ctx->in[14 * sizeof(uint32_t)], &ctx->bits[0], 4);
memcpy(&ctx->in[15 * sizeof(uint32_t)], &ctx->bits[1], 4);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, MD5LENGTH);
memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
}
#ifndef ASM_MD5
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
void MD5Transform(uint32_t buf[4], uint32_t const in[16])
{
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
#endif

29
digest/md5.h Normal file
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@@ -0,0 +1,29 @@
#ifndef MD5_H
#define MD5_H
#ifdef HAVE_STDINT_H
#include <stdint.h>
#else
typedef unsigned int uint32_t;
#endif
#define MD5LENGTH 16
struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
};
void MD5Init(struct MD5Context *context);
void MD5Update(struct MD5Context *context, unsigned char const *buf,
unsigned len);
void MD5Final(unsigned char digest[MD5LENGTH], struct MD5Context *context);
void MD5Transform(uint32_t buf[4], uint32_t const in[16]);
/*
* This is needed to make RSAREF happy on some MS-DOS compilers.
*/
typedef struct MD5Context MD5_CTX;
#endif /* !MD5_H */

10
partition.cpp
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@@ -41,6 +41,7 @@
#include "partitions.hpp"
#include "data.hpp"
#include "twrp-functions.hpp"
#include "twrpDigest.hpp"
#include "twrpTar.hpp"
extern "C" {
#include "mtdutils/mtdutils.h"
@@ -943,13 +944,15 @@ bool TWPartition::Check_MD5(string restore_folder) {
string Full_Filename;
char split_filename[512];
int index = 0;
twrpDigest md5sum;
Full_Filename = restore_folder + "/" + Backup_FileName;
if (!TWFunc::Path_Exists(Full_Filename)) {
// This is a split archive, we presume
sprintf(split_filename, "%s%03i", Full_Filename.c_str(), index);
while (index < 1000 && TWFunc::Path_Exists(split_filename)) {
if (TWFunc::Check_MD5(split_filename) == 0) {
md5sum.setfn(split_filename);
if (md5sum.verify_md5digest() != 0) {
LOGE("MD5 failed to match on '%s'.\n", split_filename);
return false;
}
@@ -959,7 +962,8 @@ bool TWPartition::Check_MD5(string restore_folder) {
return true;
} else {
// Single file archive
if (TWFunc::Check_MD5(Full_Filename) == 0) {
md5sum.setfn(Full_Filename);
if (md5sum.verify_md5digest() != 0) {
LOGE("MD5 failed to match on '%s'.\n", split_filename);
return false;
} else
@@ -1269,7 +1273,7 @@ bool TWPartition::Backup_Tar(string backup_folder) {
unsigned long long total_bsize = 0, file_size;
twrpTar tar;
vector <string> files;
if (!Mount(true))
return false;

37
partitionmanager.cpp
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@@ -40,6 +40,7 @@
#include "data.hpp"
#include "twrp-functions.hpp"
#include "fixPermissions.hpp"
#include "twrpDigest.hpp"
#ifdef TW_INCLUDE_CRYPTO
#ifdef TW_INCLUDE_JB_CRYPTO
@@ -477,6 +478,7 @@ bool TWPartitionManager::Make_MD5(bool generate_md5, string Backup_Folder, strin
string command;
string Full_File = Backup_Folder + Backup_Filename;
string result;
twrpDigest md5sum;
if (!generate_md5)
return true;
@@ -485,30 +487,39 @@ bool TWPartitionManager::Make_MD5(bool generate_md5, string Backup_Folder, strin
ui_print(" * Generating md5...\n");
if (TWFunc::Path_Exists(Full_File)) {
command = "cd '" + Backup_Folder + "' && md5sum '" + Backup_Filename + "' > '" + Backup_Filename + ".md5'";
if (TWFunc::Exec_Cmd(command, result) == 0) {
ui_print(" * MD5 Created.\n");
return true;
} else {
md5sum.setfn(Backup_Folder + Backup_Filename);
if (md5sum.computeMD5() == 0)
if (md5sum.write_md5digest() == 0)
ui_print(" * MD5 Created.\n");
else
return -1;
else
ui_print(" * MD5 Error!\n");
return false;
}
} else {
char filename[512];
int index = 0;
string strfn;
sprintf(filename, "%s%03i", Full_File.c_str(), index);
strfn = filename;
ostringstream intToStr;
ostringstream fn;
while (TWFunc::Path_Exists(filename) == true) {
ostringstream intToStr;
intToStr << index;
ostringstream fn;
fn << setw(3) << setfill('0') << intToStr.str();
command = "cd '" + Backup_Folder + "' && md5sum '" + Backup_Filename + fn.str() + "' > '" + Backup_Filename + fn.str() + ".md5'";
if (TWFunc::Exec_Cmd(command, result) != 0) {
ui_print(" * MD5 Error.\n");
return false;
md5sum.setfn(strfn);
if (md5sum.computeMD5() == 0) {
if (md5sum.write_md5digest() != 0)
{
ui_print(" * MD5 Error.\n");
return false;
}
}
else {
return -1;
}
index++;
sprintf(filename, "%s%03i", Full_File.c_str(), index);
strfn = filename;
}
if (index == 0) {
LOGE("Backup file: '%s' not found!\n", filename);

11
twinstall.cpp
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@@ -39,6 +39,7 @@
#include "variables.h"
#include "data.hpp"
#include "partitions.hpp"
#include "twrpDigest.hpp"
#include "twrp-functions.hpp"
extern RecoveryUI* ui;
@@ -261,7 +262,8 @@ exit:
extern "C" int TWinstall_zip(const char* path, int* wipe_cache) {
int err, zip_verify, md5_return;
twrpDigest md5sum;
string strpath = path;
ui_print("Installing '%s'...\n", path);
if (!PartitionManager.Mount_By_Path(path, 0)) {
@@ -270,14 +272,15 @@ extern "C" int TWinstall_zip(const char* path, int* wipe_cache) {
}
ui_print("Checking for MD5 file...\n");
md5_return = TWFunc::Check_MD5(path);
if (md5_return == 0) {
md5sum.setfn(strpath);
md5_return = md5sum.verify_md5digest();
if (md5_return == -2) {
// MD5 did not match.
LOGE("Zip MD5 does not match.\nUnable to install zip.\n");
return INSTALL_CORRUPT;
} else if (md5_return == -1) {
ui_print("Skipping MD5 check: no MD5 file found.\n");
} else if (md5_return == 1)
} else if (md5_return == 0)
ui_print("Zip MD5 matched.\n"); // MD5 found and matched.
DataManager::GetValue(TW_SIGNED_ZIP_VERIFY_VAR, zip_verify);

58
twrp-functions.cpp
View File

@@ -49,48 +49,6 @@ int TWFunc::Exec_Cmd(string cmd, string &result) {
return ret;
}
/* Checks md5 for a path
Return values:
-1 : MD5 does not exist
0 : Failed
1 : Success */
int TWFunc::Check_MD5(string File) {
int ret;
string Command, DirPath, MD5_File, Sline, Filename, MD5_File_Filename, OK;
char line[255];
size_t pos;
string result;
MD5_File = File + ".md5";
if (Path_Exists(MD5_File)) {
DirPath = Get_Path(File);
MD5_File = Get_Filename(MD5_File);
Command = "cd '" + DirPath + "' && /sbin/busybox md5sum -c '" + MD5_File + "'";
Exec_Cmd(Command, result);
pos = result.find(":");
if (pos != string::npos) {
Filename = Get_Filename(File);
MD5_File_Filename = result.substr(0, pos);
OK = result.substr(pos + 2, result.size() - pos - 2);
if (Filename == MD5_File_Filename && (OK == "OK" || OK == "OK\n")) {
//MD5 is good, return 1
ret = 1;
} else {
// MD5 is bad, return 0
ret = 0;
}
} else {
// MD5 is bad, return 0
ret = 0;
}
} else {
//No md5 file, return -1
ret = -1;
}
return ret;
}
// Returns "file.name" from a full /path/to/file.name
string TWFunc::Get_Filename(string Path) {
size_t pos = Path.find_last_of("/");
@@ -482,10 +440,24 @@ unsigned int TWFunc::Get_D_Type_From_Stat(string Path) {
}
int TWFunc::read_file(string fn, string& results) {
ifstream file;
file.open(fn.c_str(), ios::in);
if (file.is_open()) {
file >> results;
file.close();
return 0;
}
LOGI("Cannot find file %s\n", fn.c_str());
return -1;
}
int TWFunc::read_file(string fn, vector<string>& results) {
ifstream file;
string line;
file.open(fn.c_str(), ios::in);
if (file.is_open()) {
file >> results;
while (getline(file, line))
results.push_back(line);
file.close();
return 0;
}

2
twrp-functions.hpp
View File

@@ -19,7 +19,6 @@ typedef enum
class TWFunc
{
public:
static int Check_MD5(string File);
static string Get_Root_Path(string Path); // Trims any trailing folders or filenames from the path, also adds a leading / if not present
static string Get_Path(string Path); // Trims everything after the last / in the string
static string Get_Filename(string Path); // Trims the path off of a filename
@@ -41,6 +40,7 @@ public:
static int copy_file(string src, string dst, int mode); //copy file from src to dst with mode permissions
static unsigned int Get_D_Type_From_Stat(string Path); // Returns a dirent dt_type value using stat instead of dirent
static timespec timespec_diff(timespec& start, timespec& end); // Return a diff for 2 times
static int read_file(string fn, vector<string>& results); //read from file
static int read_file(string fn, string& results); //read from file
static int write_file(string fn, string& line); //write from file
static int drop_caches(void); //drop linux cache memory

112
twrpDigest.cpp Normal file
View File

@@ -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;
}

35
twrpDigest.hpp Normal file
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@@ -0,0 +1,35 @@
/*
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"
}
using namespace std;
class twrpDigest {
public:
void setfn(string fn);
void setdir(string dir);
int computeMD5(void);
int verify_md5digest(void);
int write_md5digest(void);
private:
int read_md5digest(void);
string md5fn;
vector<string> lines;
unsigned char md5sum[MD5LENGTH];
};