Hello, When I send signed mails to me with the MUA mutt (just for test) the received mail is verified fine in mutt, i.e. it says in mutt:
[-- Begin signature information --] Good signature from: Matthias Apitz (GnuPG CCID) <g...@unixarea.de> created: Wed May 31 21:40:19 2017 [-- End signature information --] [-- The following data is signed --] hello [-- End of signed data --] but when I save the signature part into a file 'signature.asc' and the ASCII content of the mail as a file 'data' from the menu in mutt: q:Exit s:Save |:Pipe p:Print ?:Help I 1 <no description> [text/plain, 7bit, utf-8, 0.1K] I 2 signature.asc [applica/pgp-signat, 7bit, 0.8K] and run: $ gpg2 --verify signature.asc data gpg: Signature made Wed May 31 21:40:19 2017 CEST gpg: using RSA key 5E69FBAC1618562CB3CBFBC147CCF7E476FE9D11 gpg: BAD signature from "Matthias Apitz (GnuPG CCID) <g...@unixarea.de>" [ultimate] it says 'BAD signature'. Why the file 'data' has BAD signature? The file 'data' after saving from mutt from the above menu just contains: $ cat data hello $ od -c data 0000000 h e l l o \n \n 0000007 I digged into this trussing the mutt-gpg2 process chain and it turned out that the netto data which verifies mutt is: $ od -c data.asc 0000000 C o n t e n t - T y p e : t e 0000020 x t / p l a i n ; c h a r s e 0000040 t = u t f - 8 \r \n C o n t e n t 0000060 - D i s p o s i t i o n : i n 0000100 l i n e \r \n \r \n h e l l o \r \n \r 0000120 \n 0000121 i.e. containes as well some mail header line about the content and charset and esp. as well \r\n line terminators. If I modify the file to this it is fine: $ gpg2 --verify signature.asc data.asc gpg: Signature made Wed May 31 21:40:19 2017 CEST gpg: using RSA key 5E69FBAC1618562CB3CBFBC147CCF7E476FE9D11 gpg: Good signature from "Matthias Apitz (GnuPG CCID) <g...@unixarea.de>" [ultimate] Is this correct how mutt signs such mail bodies? matthias -- Matthias Apitz, ✉ g...@unixarea.de, ⌂ http://www.unixarea.de/ ☎ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub
signature.asc
Description: PGP signature
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