62 lines
2.1 KiB
Markdown
62 lines
2.1 KiB
Markdown
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---
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title: Bitcoin wallet recovery using Photorec
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date: 2012-04-01 21:06:01
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tags: [bitcoin, recovery]
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category: linux
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aliases:
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- /2012/04/01/bitcoin-wallet-recovery-photorec/
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- /posts/2012/04/01/bitcoin-wallet-recovery-photorec/
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---
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Ever cried over damaged disk holding your bitcoin wallet ? Ever
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formatted storage holding a perfectly valid and the only copy of your
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wallet.dat ? Yes, me too. Well, there's
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[Photorec](http://www.cgsecurity.org/wiki/PhotoRec), an opensource file
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recovery software. It just skips the partition and filesystem info and
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scans for plain file signatures on the disk. Unfortunately it does not
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recognize Bitcoin's Wallet as a file format. Bitcoin wiki
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[states](https://en.bitcoin.it/wiki/Wallet) that wallet.dat is just a
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good old BerkeleyDB. Just let me check that with the famous `file`
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command:
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```
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[cyryl@uglybook ~]$ file .bitcoin/wallet.dat
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.bitcoin/wallet.dat: Berkeley DB (Btree, version 9, native byte-order)
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```
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That is right. Photorec however, has its own file-type
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detection magic. Let's see whether it works on the wallet.
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```
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[cyryl@uglybook ~]$ fidentify .bitcoin/wallet.dat
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.bitcoin/wallet.dat: unknown
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```
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Uhoh. Do not abandon hope for not all is lost ! Photorec [provides a
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way](http://www.cgsecurity.org/wiki/Add_your_own_extension_to_PhotoRec)
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for you to add custom signatures. The only missing ingredient appears to
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be the knowledge possed by the `file` command. Just check your linux installation for
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`file`'s detection signatures. On my system these are to be found
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under `/usr/share/misc/magic`. We need file extensions, offset and some
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magic number for Photorec to work. Well, extension is `.dat`, magics
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and offsets are stored in the file mentioned above. Translate offsets
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from decimal-based to hexs and take care of endianess and done :)
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```
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[cyryl@uglybook ~]# cat .photorec.sig
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dat 0x0 0x00061561
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dat 0x0 0x61150600
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dat 0x0 0x00053162
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dat 0x0 0x62310500
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dat 0xc 0x00061561
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dat 0xc 0x61150600
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dat 0xc 0x00053162
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dat 0xc 0x62310500
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dat 0xc 0x00042253
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dat 0xc 0x53220400
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dat 0xc 0x00040988
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dat 0xc 0x88090400
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```
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That is it. Happy wallet recovery.
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