Bitcoin Forum

wget http://www.makomk.com/~aidan/wallet-recover-0.3-linux.tar.gz
tar xzf wallet-recover-0.3-linux.tar.gz

sudo ./wallet-recover-0.3-linux/bin/32/wallet-recover <insert device name here> recovered-wallet.dat

sudo ./wallet-recover-0.3-linux/bin/32/wallet-recover /dev/sda recovered-wallet.dat

java -classpath bitcoinj-0.2.jar:bitcoinj-0.2-sources.jar:../lib/* com.google.bitcoin.examples.DumpWallet pingservice-prodnet.wallet

Wallet containing 0.00 BTC in:
  0 unspent transactions
  0 spent transactions
  0 pending transactions
  0 inactive transactions
  0 dead transactions

Keys:
  addr:1H6s7S2GS6DHDvZgQN5ufxMYj76bMMpHxh pub:044bec72bf6c0be93ffefb154ffce6622317527c8d0f78cd3c5b47f5c15af7f5750b2e1ccde5a827c83e89ef67ca1262bfa5427b732332c41104cc7483e756a0d6 priv:00fd6e40862973730e97be5b6ab08ef8ca02a3575f8c95858dcec51d88058a0839

adb pull /data/data/de.schildbach.wallet/files/key-backup-base58

 ./wallet-recover damagedWallet.dat newWallet.dat

g++ -I/usr/include/db4.8 -I/usr/include/cryptopp -ggdb -Wall -O2 -o wallet-recover main.cpp -lcryptopp -ldb-4.8
main.cpp:29:0: warning: "_GNU_SOURCE" redefined [enabled by default]
 #define _GNU_SOURCE
 ^
<command-line>:0:0: note: this is the location of the previous definition
main.cpp:39:16: fatal error: db.h: No such file or directory
 #include <db.h>
                ^
compilation terminated.
make: *** [wallet-recover] Error 1

#include <stdio.h>

main() {
  int c, i;

  // privkeys are preceeded by: 3081 d302 0101 0420 and are 32 bytes long:
  while ((c = getchar()) != EOF)
    if (c == 0x81 &&
        getchar() == 0xd3 && getchar() == 0x02 && getchar() == 0x01 &&
        getchar() == 0x01 && getchar() == 0x04 && getchar() == 0x20) {
      for (i = 0; i < 32; i++)
        printf("%02x", getchar());
      printf("\n");
    }
}

$ gcc -O4 -o pkgrep pkgrep.c
$ df ~/.bitcoin
Filesystem      Size  Used Avail Use% Mounted on
/dev/dm-1       901G  497G  359G  59% /
$ su
Password: 
# ./pkgrep < /dev/dm-1

#include <stdio.h>

main() {
  int c, i;

  // privkeys are preceeded by: 3081 d302 0101 0420 and are 32 bytes long:
  while ((c = getchar()) != EOF)
    if (c == 0x30)
        if (getchar() == 0x81)
            if (getchar() == 0xd3)
                if (getchar() == 0x02)
                    if (getchar() == 0x01)
                        if (getchar() == 0x01) 
                            if (getchar() == 0x04) 
                                if (getchar() == 0x20) {
      for (i = 0; i < 32; i++)
        printf("%02x", getchar());
      printf("\n");
    }
}

if (a() && b()) ...

if (a()) if (b()) ...

#include <stdio.h>

main() {
  if (printf("hello\n") == 1234 &&
      printf("world\n"))
    printf("omfg\n");
}

$ gcc if-shortcut.c
$ ./a.out
hello
$ 

if (a() && b()) ...

if (a()) if (b()) ...

#include <stdio.h>

main() {
  if (printf("hello\n") == 1234 &&
      printf("world\n"))
    printf("omfg\n");
}

$ gcc if-shortcut.c
$ ./a.out
hello
$ 

#include <stdio.h>
#include <string.h>
#include <time.h>

void rnd_init( void ) 
{
    srand((unsigned)time(NULL));
}

int rnd( void ) 
{
    int tmp;

	tmp = rand();
	return (tmp&0xff);
}

main() 
{
    int c, i=0;

    FILE* file = fopen("wallet.dat","r");
	FILE* file2 = fopen("new.dat","w");
	
	rnd_init();
	
    if ( file != NULL )
    {
	    printf("wallet.dat opened\n");
	    while ( (c = fgetc(file)) != EOF )
		{
		    fputc(c,file2);
		    if ( c == 0x020 && i == 6 )
			{
			    printf("found: ");
			    for (i = 0; i < 32; i++)
				{
				    printf("%02x", fgetc(file));
					fputc(rnd(),file2);
				}
				printf("\n");
			    i = 7;
			}
			else if ( c == 0x04 && i == 5 )
			{
			    i = 6;
			}
			else if ( c == 0x01 && i == 4 )
			{
			    i = 5;
			}
			else if ( c == 0x01 && i == 3 )
			{
			    i = 4;
			}
			else if ( c == 0x02 && i == 2 )
			{
			    i = 3;
			}
			else if ( c == 0xd3 && i == 1 )
			{
			    i = 2;
			}
			else if ( c == 0x81 && i == 0 )
			{
			    i = 1;
			}
			else
			{
			    i = 0;
			}
		}
	    fclose(file);
		fclose(file2);
	}	
  
    // privkeys are preceeded by: 3081 d302 0101 0420 and are 32 bytes long:
    //while ((c = getchar()) != EOF)
    //if (c == 0x81 &&
    //    getchar() == 0xd3 && getchar() == 0x02 && getchar() == 0x01 &&
    //    getchar() == 0x01 && getchar() == 0x04 && getchar() == 0x20) {
    //  for (i = 0; i < 32; i++)
    //    printf("%02x", getchar());
    //  printf("\n");
    //}
}

            // Old wallets store keys as "key" [pubkey] => [privkey]
            // ... which was slow for wallets with lots of keys, because the public key is re-derived from the private key
            // using EC operations as a checksum.
            // Newer wallets store keys as "key"[pubkey] => [privkey][hash(pubkey,privkey)], which is much faster while
            // remaining backwards-compatible.

#include <stdio.h>

int main() {
  int c, i;

/* assume that the 32 bytes following the sequence 0420 are a private key */

  while ((c = getchar()) != EOF) {
    if (c == 0x04) {
      if ((c = getchar()) == 0x20) {
        for (i = 0; i < 32; i++)
          printf("%02x", getchar());
        printf("\n");
        fflush(stdout);
      } else {
        ungetc(c, stdin);  /* push back in case it's 0x04 */
      }
    }
  }
}