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#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <glib.h>
#include <pbc.h>
#include <pbc_random.h>
#include "bswabe.h"
#include "common.h"
char* usage =
"Usage: cpabe-dec [OPTION ...] PUB_KEY PRIV_KEY FILE\n"
"\n"
"Decrypt FILE using private key PRIV_KEY and assuming public key\n"
"PUB_KEY. If the name of FILE is X.cpabe, the decrypted file will\n"
"be written as X and FILE will be removed. Otherwise the file will be\n"
"decrypted in place. Use of the -o option overrides this\n"
"behavior.\n"
"\n"
"Mandatory arguments to long options are mandatory for short options too.\n\n"
" -h, --help print this message\n\n"
" -v, --version print version information\n\n"
" -k, --keep-input-file don't delete original file\n\n"
" -o, --output FILE write output to FILE\n\n"
" -d, --deterministic use deterministic \"random\" numbers\n"
" (only for debugging)\n\n"
/* " -s, --no-opt-sat pick an arbitrary way of satisfying the policy\n" */
/* " (only for performance comparison)\n\n" */
/* " -n, --naive-dec use slower decryption algorithm\n" */
/* " (only for performance comparison)\n\n" */
/* " -f, --flatten use slightly different decryption algorithm\n" */
/* " (may result in higher or lower performance)\n\n" */
/* " -r, --report-ops report numbers of group operations\n" */
/* " (only for performance evaluation)\n\n" */
"";
/* enum { */
/* DEC_NAIVE, */
/* DEC_FLATTEN, */
/* DEC_MERGE, */
/* } dec_strategy = DEC_MERGE; */
char* pub_file = 0;
char* prv_file = 0;
char* in_file = 0;
char* out_file = 0;
/* int no_opt_sat = 0; */
/* int report_ops = 0; */
int keep = 0;
/* int num_pairings = 0; */
/* int num_exps = 0; */
/* int num_muls = 0; */
void
parse_args( int argc, char** argv )
{
int i;
for( i = 1; i < argc; i++ )
if( !strcmp(argv[i], "-h") || !strcmp(argv[i], "--help") )
{
printf("%s", usage);
exit(0);
}
else if( !strcmp(argv[i], "-v") || !strcmp(argv[i], "--version") )
{
printf(CPABE_VERSION, "-dec");
exit(0);
}
else if( !strcmp(argv[i], "-k") || !strcmp(argv[i], "--keep-input-file") )
{
keep = 1;
}
else if( !strcmp(argv[i], "-o") || !strcmp(argv[i], "--output") )
{
if( ++i >= argc )
die(usage);
else
out_file = argv[i];
}
else if( !strcmp(argv[i], "-d") || !strcmp(argv[i], "--deterministic") )
{
pbc_random_set_deterministic(0);
}
/* else if( !strcmp(argv[i], "-s") || !strcmp(argv[i], "--no-opt-sat") ) */
/* { */
/* no_opt_sat = 1; */
/* } */
/* else if( !strcmp(argv[i], "-n") || !strcmp(argv[i], "--naive-dec") ) */
/* { */
/* dec_strategy = DEC_NAIVE; */
/* } */
/* else if( !strcmp(argv[i], "-f") || !strcmp(argv[i], "--flatten") ) */
/* { */
/* dec_strategy = DEC_FLATTEN; */
/* } */
/* else if( !strcmp(argv[i], "-r") || !strcmp(argv[i], "--report-ops") ) */
/* { */
/* report_ops = 1; */
/* } */
else if( !pub_file )
{
pub_file = argv[i];
}
else if( !prv_file )
{
prv_file = argv[i];
}
else if( !in_file )
{
in_file = argv[i];
}
else
die(usage);
if( !pub_file || !prv_file || !in_file )
die(usage);
if( !out_file )
{
if( strlen(in_file) > 6 &&
!strcmp(in_file + strlen(in_file) - 6, ".cpabe") )
out_file = g_strndup(in_file, strlen(in_file) - 6);
else
out_file = strdup(in_file);
}
if( keep && !strcmp(in_file, out_file) )
die("cannot keep input file when decrypting file in place (try -o)\n");
}
int
main( int argc, char** argv )
{
bswabe_pub_t* pub;
bswabe_prv_t* prv;
int file_len;
GByteArray* aes_buf;
GByteArray* plt;
GByteArray* cph_buf;
bswabe_cph_t* cph;
element_t m;
parse_args(argc, argv);
pub = bswabe_pub_unserialize(suck_file(pub_file), 1);
prv = bswabe_prv_unserialize(pub, suck_file(prv_file), 1);
read_cpabe_file(in_file, &cph_buf, &file_len, &aes_buf);
cph = bswabe_cph_unserialize(pub, cph_buf, 1);
if( !bswabe_dec(pub, prv, cph, m) )
die("%s", bswabe_error());
bswabe_cph_free(cph);
plt = aes_128_cbc_decrypt(aes_buf, m);
g_byte_array_set_size(plt, file_len);
g_byte_array_free(aes_buf, 1);
spit_file(out_file, plt, 1);
if( !keep )
unlink(in_file);
/* report ops if necessary */
/* if( report_ops ) */
/* printf("pairings: %5d\n" */
/* "exponentiations: %5d\n" */
/* "multiplications: %5d\n", num_pairings, num_exps, num_muls); */
return 0;
}
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