162 lines
3.2 KiB
C++
162 lines
3.2 KiB
C++
/*
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* This is part of my wrapper-class to create
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* a MD5 Hash from a string and a file.
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*
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* This code is completly free, you
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* can copy it, modify it, or do
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* what ever you want with it.
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*
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* Feb. 2005
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* Benjamin Grüdelbach
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*/
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/*
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* Changed unsigned long int types into uint32_t to make this work on 64bit systems.
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* Sep. 5. 2009
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* Petr Mrázek
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*/
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//----------------------------------------------------------------------
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//basic includes
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#include <algorithm>
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#include <fstream>
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#include <iostream>
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#include <errno.h>
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#include <string.h>
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//my includes
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#include "md5wrapper.h"
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#include "md5.h"
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//---------privates--------------------------
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/*
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* internal hash function, calling
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* the basic methods from md5.h
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*/
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std::string md5wrapper::hashit(unsigned char *data, size_t length)
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{
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MD5Context ctx;
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//init md5
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MD5Init(&ctx);
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//update with our string
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MD5Update(&ctx, data, length);
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//create the hash
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unsigned char buff[16] = "";
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MD5Final((unsigned char*)buff,&ctx);
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//converte the hash to a string and return it
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return convToString(buff);
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}
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/*
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* converts the numeric hash to
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* a valid std::string.
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* (based on Jim Howard's code;
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* http://www.codeproject.com/cpp/cmd5.asp)
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*/
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std::string md5wrapper::convToString(unsigned char *bytes)
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{
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char asciihash[33];
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int p = 0;
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for(int i=0; i<16; i++)
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{
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::sprintf(&asciihash[p],"%02x",bytes[i]);
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p += 2;
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}
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asciihash[32] = '\0';
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return std::string(asciihash);
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}
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//---------publics--------------------------
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//constructor
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md5wrapper::md5wrapper()
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{
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}
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//destructor
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md5wrapper::~md5wrapper()
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{
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}
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/*
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* creates a MD5 hash from
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* "text" and returns it as
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* string
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*/
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std::string md5wrapper::getHashFromString(std::string text)
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{
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return this->hashit((unsigned char*)text.data(), text.length());
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}
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/*
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* creates a MD5 hash from
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* a file specified in "filename" and
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* returns it as string
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* (based on Ronald L. Rivest's code
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* from RFC1321 "The MD5 Message-Digest Algorithm")
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*/
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std::string md5wrapper::getHashFromFile(std::string filename, uint32_t & length, char * first_kb)
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{
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FILE *file;
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MD5Context context;
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int len;
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int saved = 0;
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unsigned char buffer[1024], digest[16];
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//open file
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if ((file = fopen (filename.c_str(), "rb")) == NULL)
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{
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return "file unreadable.";
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}
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length = 0;
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//init md5
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MD5Init (&context);
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//read the filecontent
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while (1)
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{
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errno = 0;
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len = fread (buffer, 1, 1024, file);
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if(saved < 1024 && first_kb)
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{
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memcpy(first_kb + saved, buffer, std::min (len, 1024 - saved));
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saved += len;
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}
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length += len;
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if(len != 1024)
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{
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int err = ferror(file);
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//FIXME: check errno here.
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if(err)
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{
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fclose(file);
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return strerror(err);
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}
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if(feof(file))
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{
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MD5Update (&context, buffer, len);
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break;
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}
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}
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MD5Update (&context, buffer, len);
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}
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/*
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generate hash, close the file and return the
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hash as std::string
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*/
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MD5Final (digest, &context);
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fclose (file);
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return convToString(digest);
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}
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/*
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* EOF
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*/
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