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PhotoRec: it's not possible to get the file size for encrypted GnuPG message without the password

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This commit is contained in:
Christophe Grenier 2008-06-10 12:54:36 +02:00
parent 721e07c84d
commit 0e1d787b73
1 changed files with 31 additions and 17 deletions
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48
src/file_gpg.c
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@ -81,11 +81,15 @@ static unsigned int openpgp_length_type(const unsigned char *buf, unsigned int *
*length_type=0;
return 0;
}
log_debug("%02x %02x %02x %02x %02x %02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
#ifdef DEBUG_GPG
log_info("%02x %02x %02x %02x %02x %02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
#endif
if((buf[0]&0x40)==0)
{
/* Old format */
log_debug(" old_format\n");
#ifdef DEBUG_GPG
log_info(" old_format\n");
#endif
switch(buf[0]&0x3)
{
case 0:
@ -102,7 +106,9 @@ static unsigned int openpgp_length_type(const unsigned char *buf, unsigned int *
return 0;
}
}
log_debug(" new_format\n");
#ifdef DEBUG_GPG
log_info(" new_format\n");
#endif
/* One-Octet Lengths */
if(buf[1]<=191)
{
@ -184,11 +190,13 @@ static int header_check_gpg(const unsigned char *buffer, const unsigned int buff
}
if(nbr<2)
return 0;
#ifdef DEBUG_GPG
for(i=0;i<nbr;i++)
{
log_debug("%02u gpg tag %u, size=%u (0x%x - %u)\n",
log_info("%02u gpg tag %u, size=%u (0x%x - %u)\n",
i, packet_tag[i], length[i], length[i], length_type[i]);
}
#endif
/* Public-Key Encrypted Session Key Packet v3 */
if(buffer[0]==0x85 && buffer[3]==0x03)
{
@ -205,30 +213,34 @@ static int header_check_gpg(const unsigned char *buffer, const unsigned int buff
return 0;
}
}
if(start_recovery>0)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_gpg.extension;
return 1;
}
/* Secret-Key Packet v4 followed by User ID Packet */
if(buffer[0]==0x95 && buffer[3]==0x04 && packet_tag[1]==13 && is_valid_pubkey_algo(buffer[8])>0)
start_recovery=1;
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_gpg.extension;
file_recovery_new->data_check=&data_check_gpg;
file_recovery_new->file_check=&file_check_size;
return 1;
}
/* algo buffer[8]*/
/* Public-Key Packet + User ID Packet */
#if 0
if(buffer[0]==0x99 && packet_tag[1]==13)
start_recovery=1;
#endif
if(start_recovery==0)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->calculated_file_size=0;
file_recovery_new->min_filesize=0;
file_recovery_new->data_check=&data_check_gpg;
file_recovery_new->extension=file_hint_gpg.extension;
//file_recovery_new->file_check=&file_check_size;
return 1;
return 0;
}
static int data_check_gpg(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
log_debug("data_check_gpg\n");
while(file_recovery->calculated_file_size + 6 < file_recovery->file_size + buffer_size/2)
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
{
unsigned int packet_tag;
unsigned int length_type;
@ -240,7 +252,9 @@ static int data_check_gpg(const unsigned char *buffer, const unsigned int buffer
length=openpgp_length_type(&buffer[i], &length_type);
if(length_type==0)
return 2; /* Don't know how to find the size */
log_debug("gpg tag %u, size=%u\n", packet_tag, length);
#ifdef DEBUG_GPG
log_info("gpg tag %u, size=%u\n", packet_tag, length);
#endif
file_recovery->calculated_file_size+=length_type;
file_recovery->calculated_file_size+=length;
}