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#include <openssl/bio.h>
#include <openssl/evp.h>
#include <stdlib.h>

string base64_encode( const string &str ){

    BIO *base64_filter = BIO_new( BIO_f_base64() );
    BIO_set_flags( base64_filter, BIO_FLAGS_BASE64_NO_NL );

    BIO *bio = BIO_new( BIO_s_mem() );
    BIO_set_flags( bio, BIO_FLAGS_BASE64_NO_NL );

    bio = BIO_push( base64_filter, bio );

    BIO_write( bio, str.c_str(), str.length() );

    BIO_flush( bio );

    char *new_data;

    long bytes_written = BIO_get_mem_data( bio, &new_data );

    string result( new_data, bytes_written );
    BIO_free_all( bio );

    return result;

}



string base64_decode( const string &str ){

    BIO *bio, *base64_filter, *bio_out;
    char inbuf[512];
    int inlen;
    base64_filter = BIO_new( BIO_f_base64() );
    BIO_set_flags( base64_filter, BIO_FLAGS_BASE64_NO_NL );

    bio = BIO_new_mem_buf( (void*)str.c_str(), str.length() );

    bio = BIO_push( base64_filter, bio );

    bio_out = BIO_new( BIO_s_mem() );

    while( (inlen = BIO_read(bio, inbuf, 512)) > 0 ){
        BIO_write( bio_out, inbuf, inlen );
    }

    BIO_flush( bio_out );

    char *new_data;
    long bytes_written = BIO_get_mem_data( bio_out, &new_data );

    string result( new_data, bytes_written );

    BIO_free_all( bio );
    BIO_free_all( bio_out );

    return result;

}