Re: --verify --status-fd separator for multiple signatures?
On Fri, 20 Mar 2015 19:41, patrick-mailingli...@whonix.org said:
Well, I don't speak C, so I can't make head or tail of what we do in
gpgme/src/verify.c.
You should still be able to follow the control flow. That is not
different from any pseudo code.
Is there a complete list of all possible start/end keyword combinations?
As, I said, checkout gpgme:
switch (code)
{
case GPGME_STATUS_NEWSIG:
if (sig)
calc_sig_summary (sig);
NEWSIG has been seen: Finalize the output for the current signature if any.
err = prepare_new_sig (opd);
opd-only_newsig_seen = 1;
Get ready for a new signature. That is the helpful feature of NEWSIG.
Note that there is no guarantee that a signature will follow: I maybe
garbled or remove and gpg won't get to the actual verification.
case GPGME_STATUS_GOODSIG:
case GPGME_STATUS_EXPSIG:
case GPGME_STATUS_EXPKEYSIG:
case GPGME_STATUS_BADSIG:
case GPGME_STATUS_ERRSIG:
case GPGME_STATUS_REVKEYSIG:
if (sig !opd-did_prepare_new_sig)
calc_sig_summary (sig);
If we have a signature and we are not yet preparing for a new signature
(i.e. have not called prepare_new-sig): Finalize the output for the
current signature
opd-only_newsig_seen = 0;
Clear flag for NEWSIG seen.
return parse_new_sig (opd, code, args, ctx-protocol);
Do something with the signature. This fucntion calls prepare_new_sig if
not yet done.
case GPGME_STATUS_VALIDSIG:
opd-only_newsig_seen = 0;
return sig ? parse_valid_sig (sig, args, ctx-protocol)
: trace_gpg_error (GPG_ERR_INV_ENGINE);
VALIDSIG is the modern version of GOODSIG. Take care of it.
case GPGME_STATUS_NODATA:
opd-only_newsig_seen = 0;
Forget about NEWSIG. The code in GPGME requires this here and for
several other status messages.
case GPGME_STATUS_EOF:
if (sig !opd-did_prepare_new_sig)
calc_sig_summary (sig);
if (opd-only_newsig_seen sig)
{
gpgme_signature_t sig2;
/* The last signature has no valid information - remove it
from the list. */
On EOF finalize the last signature. If a NEWSIG has neen seen remove
the prepared information.
Proper verification is a bit complicate if you need to do this in the
most general way. You can get away much easier in many cases. For
example VALIDSIG gives you all the information about correctly verified
signatures.
Shalom-Salam,
Werner
--
Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.
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Re: --verify --status-fd separator for multiple signatures?
Werner Koch: On Thu, 19 Mar 2015 18:39, patrick-mailingli...@whonix.org said: when using --verify combined with --status-fd [or --status-file], how can one notice in scripts, that processing the one signature is done and that further status-fd messages belong to the next message? That is unfortunately a bit complicated due to different behaviour in gpgsm and gpg. I suggest to do what we do in gpgme/src/verify.c . Of course if would be useful to make sure that NEWSIG is also emitted by gpg but you also need to take care of older gpg versions. I assume adding NEWSIG to gpg has simply be forgotten. Well, I don't speak C, so I can't make head or tail of what we do in gpgme/src/verify.c. Maybe let's put it this way. If there is no guarantee to get a NEWSIG or other separator... Is there a limited combination of start and end keywords? What I mean... Here is an example... start: [GNUPG:] ERRSIG [...] end__: [GNUPG:] NODATA [...] start: [GNUPG:] SIG_ID [...] end__: [GNUPG:] TRUST_[...] start: [GNUPG:] ERRSIG [...] end__: [GNUPG:] NO_PUBKEY [...] Is there a complete list of all possible start/end keyword combinations? Cheers, Patrick ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: --verify --status-fd separator for multiple signatures?
Doug Barton: On 3/19/15 10:39 AM, Patrick Schleizer wrote: Hi, when using --verify combined with --status-fd [or --status-file], how can one notice in scripts, that processing the one signature is done and that further status-fd messages belong to the next message? You are using --with-colons, right? No. Using --status-file. --with-colons does not seem to affect that. Cheers, Patrick ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: --verify --status-fd separator for multiple signatures?
On Thu, 19 Mar 2015 18:39, patrick-mailingli...@whonix.org said: when using --verify combined with --status-fd [or --status-file], how can one notice in scripts, that processing the one signature is done and that further status-fd messages belong to the next message? That is unfortunately a bit complicated due to different behaviour in gpgsm and gpg. I suggest to do what we do in gpgme/src/verify.c . Of course if would be useful to make sure that NEWSIG is also emitted by gpg but you also need to take care of older gpg versions. I assume adding NEWSIG to gpg has simply be forgotten. Shalom-Salam, Werner -- Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz. ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: --verify --status-fd separator for multiple signatures?
On 3/19/15 10:39 AM, Patrick Schleizer wrote: Hi, when using --verify combined with --status-fd [or --status-file], how can one notice in scripts, that processing the one signature is done and that further status-fd messages belong to the next message? You are using --with-colons, right? -- I am conducting an experiment in the efficacy of PGP/MIME signatures. This message should be signed. If it is not, or the signature does not validate, please let me know how you received this message (direct, or to a list) and the mail software you use. Thanks! signature.asc Description: OpenPGP digital signature ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
--verify --status-fd separator for multiple signatures?
Hi, when using --verify combined with --status-fd [or --status-file], how can one notice in scripts, that processing the one signature is done and that further status-fd messages belong to the next message? I mean, sometimes it shows SIG_ID, but not in case of ERRSIG. So is there some line / separator that can be reliably used? Cheers, Patrick ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On 3. 10. 2011 23:59, David Shaw wrote: On Oct 3, 2011, at 1:49 PM, pet jemen wrote: Hi, I want to sign binary data in OpenPGP Message Format. I want sign it by two or more keys. According to http://tools.ietf.org/html/rfc4880#section-5.4 it seems it is possible. (A one-octet number holding a flag showing whether the signature is nested. A zero value indicates that the next packet is another One-Pass Signature packet that describes another signature to be applied to the same message data.) I'd like to use gpg from command-line to sign an input file by two keys. I tried to sign it by: gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test1 (test1)te...@test1.org -o %1.signed --sign %1 gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test2 (test2)te...@test2.org -o %1.signed2 --sign %1.signed But the second signature signed the first one also with the first signature. I need to sign it in way were I can verify signature of signed data by both keys (the last octet of One-Pass Signature Packets (Tag 4) packet should be equal to zero). Just repeat -u as many times as you need: gpg -u the-first-key -u the-second-key -u the-third-key -u etc --sign thefile David Thank you for your advice. It is exactly what I was looking for. I've few more questions. Reason why I want sign files this way is to maintain compatibility and add additional signature for verifying. I'd like to sign file in batch mode this way. gpg2.exe --batch --quiet --yes --force-v3-sigs -z 0 --s2k-digest-algo SHA-1 --passphrase-file %passFile1% -u t0001 t0...@t0001.com --s2k-digest-algo SHA512 --passphrase-file %passFile2% -u t0002 t0...@t0002.com -o %1.signed --sign %1 It sees that pgp doesn't take password from files if I sign by multiple keys. If I sign files just by one key it works. Is there a way how to sign file with multiple signatures by two commands and to get the same OpenPgp binary format? Other problem I've noticed when I signed file in non-batch mode is that I’ve specified to use SHA512 for second signature. Problem is that the 3rd octed of One-Pass Signature Packetbodyin signed file is 0x08 which is sha256 according http://tools.ietf.org/html/rfc4880#section-9.4 Any ideas why there isn't 0x0a? Any help is welcome. Pavol Misik ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On Tue, 11 Oct 2011 13:55, pje...@gmail.com said: Other problem I've noticed when I signed file in non-batch mode is that I’ve specified to use SHA512 for second signature. You didn't. What you did is to specify an S2K hash algorithm which is used to turn passphrases into keys. Further it is not possible to change the algorithms for each key. You may be better off not to tinker around with algorithm options if you don't have a close understanding of how they work. GnuPG has sensible defaults and a preference system to select algorithms. Salam-Shalom, Werner -- Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz. ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Multiple signatures
Hi, I want to sign binary data in OpenPGP Message Format. I want sign it by two or more keys. According to http://tools.ietf.org/html/rfc4880#section-5.4 it seems it is possible. (A one-octet number holding a flag showing whether the signature is nested. A zero value indicates that the next packet is another One-Pass Signature packet that describes another signature to be applied to the same message data.) I'd like to use gpg from command-line to sign an input file by two keys. I tried to sign it by: gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test1 (test1) te...@test1.org -o %1.signed --sign %1 gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test2 (test2) te...@test2.org -o %1.signed2 --sign %1.signed But the second signature signed the first one also with the first signature. I need to sign it in way were I can verify signature of signed data by both keys (the last octet of One-Pass Signature Packets (Tag 4) packet should be equal to zero). Any help how to achieve from pgp command line is welcome. Thanks. Pavol Misik ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On Oct 3, 2011, at 1:49 PM, pet jemen wrote: Hi, I want to sign binary data in OpenPGP Message Format. I want sign it by two or more keys. According to http://tools.ietf.org/html/rfc4880#section-5.4 it seems it is possible. (A one-octet number holding a flag showing whether the signature is nested. A zero value indicates that the next packet is another One-Pass Signature packet that describes another signature to be applied to the same message data.) I'd like to use gpg from command-line to sign an input file by two keys. I tried to sign it by: gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test1 (test1) te...@test1.org -o %1.signed --sign %1 gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test2 (test2) te...@test2.org -o %1.signed2 --sign %1.signed But the second signature signed the first one also with the first signature. I need to sign it in way were I can verify signature of signed data by both keys (the last octet of One-Pass Signature Packets (Tag 4) packet should be equal to zero). Just repeat -u as many times as you need: gpg -u the-first-key -u the-second-key -u the-third-key -u etc --sign thefile David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On 10/03/2011 14:39, Aaron Toponce wrote: On Mon, Oct 03, 2011 at 07:49:21PM +0200, pet jemen wrote: I want to sign binary data in OpenPGP Message Format. I want sign it by two or more keys. According to http://tools.ietf.org/html/rfc4880#section-5.4 it seems it is possible. (A one-octet number holding a flag showing whether the signature is nested. A zero value indicates that the next packet is another One-Pass Signature packet that describes another signature to be applied to the same message data.) I'd like to use gpg from command-line to sign an input file by two keys. I tried to sign it by: gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test1 (test1) te...@test1.org -o %1.signed --sign %1 gpg2.exe --quiet --yes --force-v3-sigs -z 0 -u test2 (test2) te...@test2.org -o %1.signed2 --sign %1.signed But the second signature signed the first one also with the first signature. I need to sign it in way were I can verify signature of signed data by both keys (the last octet of One-Pass Signature Packets (Tag 4) packet should be equal to zero). You should use detached signatures: $ gpg -b -u $KEYID1 file.txt sig1.gpg $ gpg -b -u $KEYID2 file.txt sig2.gpg At this point, just concatenate the two detached sigs: $ cat sig1.gpg sig2.gpg signatures.gpg Wouldn't it be easier to just use :) Doug -- Nothin' ever doesn't change, but nothin' changes much. -- OK Go Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/ ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
gpg --verify behaves differently when multiple signatures present with --batch
when i have a set of OpenPGP signatures bundled together which have different validities, it looks like gpg behaves differently depending on if --batch is set or not. In particular, an invalid signature seems to terminate the entire --verify process (skipping later valid signatures) when --batch is set, but it does not terminate the verification process otherwise. Attached are two files: one is a simple shell script to demonstrate the problem (with embedded data and signature material), and a fake key used in the demonstrations. When i run it, i get the following output (AB means the good sig from the fake key occurs first, BA means the bad sig from my own key (D21739E9) happens first: 0 d...@pip:~/src/gmimetest/gmimetest$ ./demonstrate-flip Testing without --batch: ==AB== [GNUPG:] SIG_ID 8Dv9B4/7/rdjgFrLYlRGhj31b3o 2010-11-21 1290318596 [GNUPG:] GOODSIG FAF286F977F50B3B fake user f...@example.org [GNUPG:] VALIDSIG FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B 2010-11-21 1290318596 0 4 0 1 10 01 FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B [GNUPG:] TRUST_UNDEFINED [GNUPG:] BADSIG CCD2ED94D21739E9 Daniel Kahn Gillmor d...@fifthhorseman.net ==BA== [GNUPG:] BADSIG CCD2ED94D21739E9 Daniel Kahn Gillmor d...@fifthhorseman.net [GNUPG:] SIG_ID 8Dv9B4/7/rdjgFrLYlRGhj31b3o 2010-11-21 1290318596 [GNUPG:] GOODSIG FAF286F977F50B3B fake user f...@example.org [GNUPG:] VALIDSIG FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B 2010-11-21 1290318596 0 4 0 1 10 01 FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B [GNUPG:] TRUST_UNDEFINED Testing with --batch: ==AB== [GNUPG:] SIG_ID 8Dv9B4/7/rdjgFrLYlRGhj31b3o 2010-11-21 1290318596 [GNUPG:] GOODSIG FAF286F977F50B3B fake user f...@example.org [GNUPG:] VALIDSIG FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B 2010-11-21 1290318596 0 4 0 1 10 01 FCD3E0AFA74EE527C61E0D34FAF286F977F50B3B [GNUPG:] TRUST_UNDEFINED [GNUPG:] BADSIG CCD2ED94D21739E9 Daniel Kahn Gillmor d...@fifthhorseman.net ==BA== [GNUPG:] BADSIG CCD2ED94D21739E9 Daniel Kahn Gillmor d...@fifthhorseman.net 0 d...@pip:~/src/gmimetest/gmimetest$ And if i use a test user that doesn't actually have a copy of D21739E9 in its keyring, then i get feedback from both signatures even in order BA with --batch (i suppose because the keyring can't tell that the signature for D21739E9 is bad). I see no good reason for --batch to cause gpg to terminate on the first badsig it sees, and no documentation justifying this behavior, so it seems like a bug to me. I tested this with gpg 1.4.11 and 2.0.14 on i386 GNU/Linux systems running the current debian testing (gpg itself from debian's experimental archive) Regards, --dkg #!/bin/bash ab=$(mktemp signature.ab.XXX) if [ $? != 0 ]; then exit 1 fi ba=$(mktemp signature.ba.XXX) if [ $? != 0 ]; then exit 1 fi data=$(mktemp data.XXX) if [ $? != 0 ]; then exit 1 fi cat $data EOF Content-Type: text/plain this is a test EOF cat $ab EOF -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (GNU/Linux) iJwEAQEKAAYFAkzoswQACgkQ+vKG+Xf1CzsYYwP8CkBYHc3lX4HUAPdSa4Zkrg8KbZkaLxabNbfW X7HSx530T6/ItiJLS9kjVcF/gD9U01BsiSSuVGq0ye7a4K4BNpxN2fmbmC1SfABDNaZxh9cW/FDu B+X8VXCXYwpcGgnxDQKxvRtEEOS6jeyXySaVEKhxpia/hL7VMAOJE7OVzteJAhwEAQEKAAYFAkzo swQACgkQzNLtlNIXOekYYw/7BqdF1Re5r/XIEuLtI6M2CHX65Pkf6qomkfq/sfX3gCMCwCWnTBxQ Tv0ywFgeCOI+zNBLgL1VNh/rUcgKFQxAwFh26c28mqMr48eLBAmYbatCPjfwT4Er/yizwPGRKXQ+ 903c9wTowNCS0Bk/95LDsMx4c0JuyTUZDXTT0Qf/qcsfhL9OPD0CdPBmA9czDivNPXevCr4RGYoT xGQVmrlZI2wzCzNYW/SraDtvTVjRUwzCFDNHzZ8u1duO7Qm+08SrNmODHaTjAmzkMJ4S7gDlC151 fKWLUZ3vjWoAlvahPlQbnyzqiah4AY45BjS+GcdAj6GL8dpisWSrwrS943LbNFCnQRncwMDzky9p h2Jsd9ziurfC0z9YBRKELXx21DGNSP6W5x1DqXSpzcTcM/gL+yvPc0dkkx4DVKg0++Y0/cDo/2/g Gn4s4AM5iS5gYkj0LFFbCvV44OPEcjfdzgzk5jRQ91yCt9uDDQk2v9pHCvWQG7Dsa0o4k8QLjqb1 G7UBBoFdLIH0ouFgmxOfoynveoO83bVtF3kzFP9VMpzneA021/myT9bva3SMD5UWQLm8bSBHOqen VSt6ra7IcSdA+5KCOSNHJdkSq+1S2ctr7hsPxciTasMvA6GpMmgSKwUF+exsEMkhonuYU0nBBiey D1gByBUg+kvSCkxoBlXGi8s= -END PGP SIGNATURE- EOF cat $ba EOF -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAEBCgAGBQJM6LMEAAoJEMzS7ZTSFznpGGMP+wanRdUXua/1yBLi7SOjNgh1+uT5H+qqJpH6 v7H194AjAsAlp0wcUE79MsBYHgjiPszQS4C9VTYf61HIChUMQMBYdunNvJqjK+PHiwQJmG2rQj43 8E+BK/8os8DxkSl0PvdN3PcE6MDQktAZP/eSw7DMeHNCbsk1GQ1009EH/6nLH4S/Tjw9AnTwZgPX Mw4rzT13rwq+ERmKE8RkFZq5WSNsMwszWFv0q2g7b01Y0VMMwhQzR82fLtXbju0JvtPEqzZjgx2k 4wJs5DCeEu4A5QtedXyli1Gd741qAJb2oT5UG58s6omoeAGOOQY0vhnHQI+hi/HaYrFkq8K0veNy 2zRQp0EZ3MDA85MvaYdibHfc4rq3wtM/WAUShC18dtQxjUj+lucdQ6l0qc3E3DP4C/srz3NHZJMe A1SoNPvmNP3A6P9v4Bp+LOADOYkuYGJI9CxRWwr1eODjxHI33c4M5OY0UPdcgrfbgw0JNr/aRwr1 kBuw7GtKOJPEC46m9Ru1AQaBXSyB9KLhYJsTn6Mp73qDvN21bRd5MxT/VTKc53gNNtf5sk/W72t0 jA+VFkC5vG0gRzqnp1Ureq2uyHEnQPuSgjkjRyXZEqvtUtnLa+4bD8XIk2rDLwOhqTJoEisFBfns bBDJIaJ7mFNJwQYnsg9YAcgVIPpL0gpMaAZVxovLiJwEAQEKAAYFAkzoswQACgkQ+vKG+Xf1CzsY YwP8CkBYHc3lX4HUAPdSa4Zkrg8KbZkaLxabNbfWX7HSx530T6/ItiJLS9kjVcF/gD9U01BsiSSu VGq0ye7a4K4BNpxN2fmbmC1SfABDNaZxh9cW/FDuB+X8VXCXYwpcGgnxDQKxvRtEEOS6jeyXySaV
Re: Multiple signatures
Ok, Thanks David, But what if the file is signed by people working on different computers? So they will had their signature on the current separate file (correesponding to the people who already signed a specific file). Koushkov 2010/6/18 David Shaw ds...@jabberwocky.com On Jun 17, 2010, at 11:33 PM, Boris wrote: Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). Sure. gpg -u signer_1 -u signer_2 -u signer_3 --detach-sign file-to-sign You'll end up with a file-to-sign.sig that contains all three signatures. When you verify file-to-sign.sig, all three signatures will be checked. Alternately, you can do the same multiple signer trick with regular --sign if you want the data and signatures to be put together into a single file. David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
Thank you very much David It is exactly what I wanted 2010/6/18 David Shaw ds...@jabberwocky.com On Jun 17, 2010, at 11:33 PM, Boris wrote: Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). Sure. gpg -u signer_1 -u signer_2 -u signer_3 --detach-sign file-to-sign You'll end up with a file-to-sign.sig that contains all three signatures. When you verify file-to-sign.sig, all three signatures will be checked. Alternately, you can do the same multiple signer trick with regular --sign if you want the data and signatures to be put together into a single file. On Jun 18, 2010, at 9:14 AM, Boris wrote: Ok, Thanks David, But what if the file is signed by people working on different computers? So they will had their signature on the current separate file (correesponding to the people who already signed a specific file). If you want a bunch of people all signing the same file, have each signer do this: gpg -u signer-X -o signer-X-signature --detach-sign file-to-sign Then have them all send you their file-to-sign.sig files. You create a file containing all of them: cat signer-1-signature signer-2-signature signer-3-signature file-to-sign.sig Then anyone can verify file-to-sign.sig against the original file-to-sign and see all the signatures verified. David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On 6/18/10 3:39 PM, ved...@nym.hush.com wrote: gpg --armor -u signer -u signer2 -u signer3 --clearsign filename no. 6.5.8 and 6.5.8 ckt will crash only when trying to verify multiple signatures of the same text when *clearsigned*. Perhaps I'm in error here, but -- isn't a clearsign the command I specified? smime.p7s Description: S/MIME Cryptographic Signature ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Multiple signatures
Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). Thanks, Koushkov ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On 6/17/10 11:33 PM, Boris wrote: Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). gpg --armor -u signer -u signer2 -u signer3 --clearsign filename Warning: these signatures will break old versions of PGP. 6.5.8 and the 6.5.8CKT builds will crash when trying to verify them. ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On Jun 17, 2010, at 11:33 PM, Boris wrote: Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). Sure. gpg -u signer_1 -u signer_2 -u signer_3 --detach-sign file-to-sign You'll end up with a file-to-sign.sig that contains all three signatures. When you verify file-to-sign.sig, all three signatures will be checked. Alternately, you can do the same multiple signer trick with regular --sign if you want the data and signatures to be put together into a single file. David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
On Jun 17, 2010, at 11:33 PM, Boris wrote: Hi, I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). Sure. gpg -u signer_1 -u signer_2 -u signer_3 --detach-sign file-to-sign You'll end up with a file-to-sign.sig that contains all three signatures. When you verify file-to-sign.sig, all three signatures will be checked. Alternately, you can do the same multiple signer trick with regular --sign if you want the data and signatures to be put together into a single file. On Jun 18, 2010, at 9:14 AM, Boris wrote: Ok, Thanks David, But what if the file is signed by people working on different computers? So they will had their signature on the current separate file (correesponding to the people who already signed a specific file). If you want a bunch of people all signing the same file, have each signer do this: gpg -u signer-X -o signer-X-signature --detach-sign file-to-sign Then have them all send you their file-to-sign.sig files. You create a file containing all of them: cat signer-1-signature signer-2-signature signer-3-signature file-to-sign.sig Then anyone can verify file-to-sign.sig against the original file-to-sign and see all the signatures verified. David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures
Robert J. Hansen rjh at sixdemonbag.org wrote on Fri Jun 18 14:13:56 CEST 2010 : I would like to know if there is a way to add multiple signatures for a file (in a separate file) and check who signed with just one command (so not by signing a signed file...). gpg --armor -u signer -u signer2 -u signer3 --clearsign filename Warning: these signatures will break old versions of PGP. 6.5.8 and the 6.5.8CKT builds will crash when trying to verify them. no. 6.5.8 and 6.5.8 ckt will crash only when trying to verify multiple signatures of the same text when *clearsigned*. Verifying 'Multiple simultaneous signatures' done in armored signed format, or in signed and encrypted format, or as detached signatures, will not cause any problem for 6.5.8, 6.5.8 ckt, or 6.5.8 commandline. vedaal ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Extracting a single signature from a file containing multiple signatures
Say `gpg --detach-sign' were used to create several detached signatures and they were concatenated into the same file. Is there a simple way to separate those signatures again? Is there documentation of the gpg signature file format online? (I am looking into allowing CVS revisions to be signed in the CVS repository, potentially by multiple users, and I want to know if I can store multiple signatures in a single binary string (I know that gpg --verify can handle this) or if I need to keep them separate, to allow for admins to later delete single, possibly expired, signatures from the signature blob by keyid. Once I get the signatures separated again, I can exec gpg to extract the keyid, but if I cannot separate them, this won't work to find and delete a single signature from the blob.) Thanks, Derek -- Derek R. Price CVS Solutions Architect Ximbiot http://ximbiot.com v: +1 717.579.6168 f: +1 717.234.3125 mailto:[EMAIL PROTECTED] ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Extracting a single signature from a file containing multiple signatures
On Wed, Sep 21, 2005 at 11:52:08AM -0400, Derek Price wrote: Say `gpg --detach-sign' were used to create several detached signatures and they were concatenated into the same file. Is there a simple way to separate those signatures again? Is there documentation of the gpg signature file format online? Yes, and yes. To separate signatures, use 'gpgsplit', which comes with gpg. You'll end up with each signature in its own file. The documentation of the signature file format is in RFC-2440: http://www.ietf.org/rfc/rfc2440.txt David ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Extracting a single signature from a file containing multiple signatures
David Shaw wrote: Yes, and yes. To separate signatures, use 'gpgsplit', which comes with gpg. You'll end up with each signature in its own file. The documentation of the signature file format is in RFC-2440: http://www.ietf.org/rfc/rfc2440.txt Thank you very much. That will be useful. Is there some way I can extract signature information from individual signatures without running gpg --verify? i.e. key ID, date, anything else that is available when the signed data may not be? Regards, Derek -- Derek R. Price CVS Solutions Architect Ximbiot http://ximbiot.com v: +1 717.579.6168 f: +1 717.234.3125 mailto:[EMAIL PROTECTED] ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures on a single file
Alphax wrote: -BEGIN PGP SIGNED MESSAGE- Hash: RIPEMD160 Berend Tober wrote: Is it possible to have multiple persons sign a single file? If so, how is this done? The particular scenario is currently this: Employees submit expense reports for business travel using a spread sheet. Current practise is the the employee fills out spread sheet via computer (or optionally prints blank spread sheet template and writes by hand with a pen), physically signs using pen and ink, physically delivers signed hardcopy to supervisor for supervisor pen-and-ink signature prior to payment processing. Desired practise is to eliminate both producing hard copy and pen-and-ink signatures, and then re-work the process using gpg electronic signatures. Thus, employee would enter data into expense report spread sheet, save, gpg sign, mail to supervisor, supervisor would (presumably) open and review spread sheet, close without changing, gpg sign, and then return to employee or forward to accounting dept. Sounds straightforward, but I didn't spot in the various manuals/guides/how-to's for gnupg how a second individual could add their signature after me. Use detached signatures? Generate a key to sign the document with, and have that key signed by the supervisor? What I don't like about doing that explicitly is that every additional signature, at least in the default operational mode, appends an additional .sig file extension. Further more, the signatures are wrapped withing one another, so that to verification would require serial verification of each preceding outer layer signature. What I've been refining during the last couple days uses a command line script to append additional detached signatures into a single signature file. This approach models more directly the co-signature concept of legacy contracts, i.e., think of buying a house -- you and you spouse are co-signators rather than having one sign the contract and the other sign the others signature. What you suggested models the concept of a notary public witnessing a signature, but that we already have by signing public keys in the trust model. ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Multiple signatures on a single file
Is it possible to have multiple persons sign a single file? If so, how is this done? The particular scenario is currently this: Employees submit expense reports for business travel using a spread sheet. Current practise is the the employee fills out spread sheet via computer (or optionally prints blank spread sheet template and writes by hand with a pen), physically signs using pen and ink, physically delivers signed hardcopy to supervisor for supervisor pen-and-ink signature prior to payment processing. Desired practise is to eliminate both producing hard copy and pen-and-ink signatures, and then re-work the process using gpg electronic signatures. Thus, employee would enter data into expense report spread sheet, save, gpg sign, mail to supervisor, supervisor would (presumably) open and review spread sheet, close without changing, gpg sign, and then return to employee or forward to accounting dept. Sounds straightforward, but I didn't spot in the various manuals/guides/how-to's for gnupg how a second individual could add their signature after me. -- BMT ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
Re: Multiple signatures on a single file
-BEGIN PGP SIGNED MESSAGE- Hash: RIPEMD160 Berend Tober wrote: Is it possible to have multiple persons sign a single file? If so, how is this done? The particular scenario is currently this: Employees submit expense reports for business travel using a spread sheet. Current practise is the the employee fills out spread sheet via computer (or optionally prints blank spread sheet template and writes by hand with a pen), physically signs using pen and ink, physically delivers signed hardcopy to supervisor for supervisor pen-and-ink signature prior to payment processing. Desired practise is to eliminate both producing hard copy and pen-and-ink signatures, and then re-work the process using gpg electronic signatures. Thus, employee would enter data into expense report spread sheet, save, gpg sign, mail to supervisor, supervisor would (presumably) open and review spread sheet, close without changing, gpg sign, and then return to employee or forward to accounting dept. Sounds straightforward, but I didn't spot in the various manuals/guides/how-to's for gnupg how a second individual could add their signature after me. Use detached signatures? Generate a key to sign the document with, and have that key signed by the supervisor? Just my 2c... - -- Alphax | /\ Encrypted Email Preferred | \ / ASCII Ribbon Campaign OpenPGP key ID: 0xF874C613 |X Against HTML email vCards http://tinyurl.com/cc9up| / \ -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.2 (MingW32) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDGRke/RxM5Ph0xhMRA53ZAJ4jpjIAJ8nqCr/xgVBRbO1IUfK3PQCeMYTy I6huYlEG2z2zt1cc1pPqTNE= =6zNZ -END PGP SIGNATURE- ___ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
