mirror of https://github.com/vitalif/grive2
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/*
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grive: an GPL program to sync a local directory with Google Drive
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Copyright (C) 2012 Wan Wai Ho
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation version 2
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of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "Crypt.hh"
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#include <iomanip>
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#include <sstream>
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// dependent libraries
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#include <openssl/evp.h>
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namespace gr { namespace crypt {
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std::string MD5( std::streambuf *file )
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{
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char buf[64 * 1024] ;
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EVP_MD_CTX md ;
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EVP_MD_CTX_init( &md );
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EVP_DigestInit_ex( &md, EVP_md5(), 0 ) ;
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std::size_t count = 0 ;
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while ( (count = file->sgetn( buf, sizeof(buf) )) > 0 )
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{
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EVP_DigestUpdate( &md, buf, count ) ;
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}
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unsigned int md5_size = EVP_MAX_MD_SIZE ;
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unsigned char md5[EVP_MAX_MD_SIZE] ;
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EVP_DigestFinal_ex( &md, md5, &md5_size ) ;
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// format the MD5 string
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std::ostringstream ss ;
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for ( unsigned int i = 0 ; i < md5_size ; i++ )
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ss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(md5[i]) ;
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return ss.str() ;
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}
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} } // end of namespaces
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