Sign files

[gimme_bottles]

Hi,

I am looking for a way to sign the content of (binary) files with my private keys. Almost every client can sign text messages, but I haven't found a solution for signing files.

Any ideas or hints on existing solutions?

[hobbes]

You could hash the file and then sign the hash.

It's should be relatively easy with pybitcointools or on linux command line:

   shasum -a 256 yourfile

Then you can use bitcoind or bitcoin-qt to sign.

[ning]

Hi,

I am looking for a way to sign the content of (binary) files with my private keys. Almost every client can sign text messages, but I haven't found a solution for signing files.

Any ideas or hints on existing solutions?

Internally, the clients actually only sign the hash digest of the text message we enter:)

[cranial.nerve]

What a problem with gpg - OpenPGP encryption and signing tool

Code:

gpg --help
 -s, --sign [ file ]             make a signature

Code:

man gpg

       -s     Make  a  signature. This command may be combined with --encrypt (for a signed and encrypted message), --symmetric (for a signed and symmetrically encrypted message), or --encrypt and --symmetric together (for a
              signed message that may be decrypted via a secret key or a passphrase).  The key to be used for signing is chosen by default or can be set with the --local-user and --default-key options.

Almost every secure focused distributive iso signed, see for example Tails: https://tails.boum.org/torrents/files/tails-i386-0.22.1.iso.sig

However, Debian sign hashes http://cdimage.debian.org/debian-cd/7.4.0/amd64/jigdo-bd/MD5SUMS.sign