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g10: Fix exporting secret keys of certain sizes.

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* g10/build-packet.c (do_key): Do not use the header length specified
by the public key packet from the keyring, but let 'write_header2'
compute the required length.
--
Specifically exporting RSA keys of length 1024 failed, as the encoded
public key packet requires 141 bytes a length that fits into one byte,
but the secret key is significantly larger, making the export fail.

GnuPG-bug-id: 2307
Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2016-04-07 13:55:42 +02:00
parent 71040f48ef
commit 02cf1357dd
1 changed files with 1 additions and 1 deletions
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g10/build-packet.c
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@ -486,7 +486,7 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
/* Build the header of the packet - which we must do after
writing all the other stuff, so that we know the length of
the packet */
write_header2 (out, ctb, iobuf_get_temp_length(a), pk->hdrbytes);
write_header2 (out, ctb, iobuf_get_temp_length(a), 0);
/* And finally write it out to the real stream. */
err = iobuf_write_temp (out, a);
}