diff -up gnupg-2.2.20/g10/gpg.c.file-is-digest gnupg-2.2.20/g10/gpg.c
--- gnupg-2.2.20/g10/gpg.c.file-is-digest 2020-04-14 16:33:42.630269318 +0200
+++ gnupg-2.2.20/g10/gpg.c 2020-04-14 16:34:46.455100086 +0200
@@ -380,6 +380,7 @@ enum cmd_and_opt_values
oTTYtype,
oLCctype,
oLCmessages,
+ oFileIsDigest,
oXauthority,
oGroup,
oUnGroup,
@@ -831,6 +832,7 @@ static ARGPARSE_OPTS opts[] = {
ARGPARSE_s_s (oPersonalCompressPreferences,
"personal-compress-preferences", "@"),
ARGPARSE_s_s (oFakedSystemTime, "faked-system-time", "@"),
+ ARGPARSE_s_n (oFileIsDigest, "file-is-digest", "@"),
ARGPARSE_s_s (oWeakDigest, "weak-digest","@"),
ARGPARSE_s_n (oUnwrap, "unwrap", "@"),
ARGPARSE_s_n (oOnlySignTextIDs, "only-sign-text-ids", "@"),
@@ -2419,6 +2421,7 @@ main (int argc, char **argv)
opt.keyid_format = KF_NONE;
opt.def_sig_expire = "0";
opt.def_cert_expire = "0";
+ opt.file_is_digest = 0;
gnupg_set_homedir (NULL);
opt.passphrase_repeat = 1;
opt.emit_version = 0;
@@ -2997,6 +3000,7 @@ main (int argc, char **argv)
opt.verify_options&=~VERIFY_SHOW_PHOTOS;
break;
case oPhotoViewer: opt.photo_viewer = pargs.r.ret_str; break;
+ case oFileIsDigest: opt.file_is_digest = 1; break;
case oDisableSignerUID: opt.flags.disable_signer_uid = 1; break;
case oIncludeKeyBlock: opt.flags.include_key_block = 1; break;
diff -up gnupg-2.2.20/g10/options.h.file-is-digest gnupg-2.2.20/g10/options.h
--- gnupg-2.2.20/g10/options.h.file-is-digest 2020-03-14 19:54:05.000000000 +0100
+++ gnupg-2.2.20/g10/options.h 2020-04-14 16:33:42.634269245 +0200
@@ -202,6 +202,7 @@ struct
int no_auto_check_trustdb;
int preserve_permissions;
int no_homedir_creation;
+ int file_is_digest;
struct groupitem *grouplist;
int mangle_dos_filenames;
int enable_progress_filter;
diff -up gnupg-2.2.20/g10/sign.c.file-is-digest gnupg-2.2.20/g10/sign.c
--- gnupg-2.2.20/g10/sign.c.file-is-digest 2020-03-14 19:35:46.000000000 +0100
+++ gnupg-2.2.20/g10/sign.c 2020-04-14 16:36:54.661751422 +0200
@@ -40,6 +40,7 @@
#include "pkglue.h"
#include "../common/sysutils.h"
#include "call-agent.h"
+#include "../common/host2net.h"
#include "../common/mbox-util.h"
#include "../common/compliance.h"
@@ -834,6 +835,8 @@ write_signature_packets (ctrl_t ctrl,
if (duration || opt.sig_policy_url
|| opt.sig_notations || opt.sig_keyserver_url)
sig->version = 4;
+ else if (opt.file_is_digest)
+ sig->version = 3;
else
sig->version = pk->version;
@@ -860,8 +863,11 @@ write_signature_packets (ctrl_t ctrl,
else
err = 0;
}
- hash_sigversion_to_magic (md, sig);
- gcry_md_final (md);
+
+ if (!opt.file_is_digest) {
+ hash_sigversion_to_magic (md, sig);
+ gcry_md_final (md);
+ }
if (!err)
err = do_sign (ctrl, pk, sig, md, hash_for (pk), cache_nonce, 0);
@@ -924,6 +930,8 @@ sign_file (ctrl_t ctrl, strlist_t filena
SK_LIST sk_rover = NULL;
int multifile = 0;
u32 duration=0;
+ int sigclass = 0x00;
+ u32 timestamp = 0;
pfx = new_progress_context ();
afx = new_armor_context ();
@@ -941,7 +949,16 @@ sign_file (ctrl_t ctrl, strlist_t filena
fname = NULL;
if( fname && filenames->next && (!detached || encryptflag) )
- log_bug("multiple files can only be detached signed");
+ log_bug("multiple files can only be detached signed\n");
+
+ if (opt.file_is_digest && (multifile || !fname))
+ log_bug("file-is-digest only works with one file\n");
+ if (opt.file_is_digest && !detached)
+ log_bug("file-is-digest can only write detached signatures\n");
+ if (opt.file_is_digest && !opt.def_digest_algo)
+ log_bug("file-is-digest needs --digest-algo\n");
+ if (opt.file_is_digest && opt.textmode)
+ log_bug("file-is-digest doesn't work with --textmode\n");
if(encryptflag==2
&& (rc=setup_symkey(&efx.symkey_s2k,&efx.symkey_dek)))
@@ -962,7 +979,7 @@ sign_file (ctrl_t ctrl, strlist_t filena
goto leave;
/* prepare iobufs */
- if( multifile ) /* have list of filenames */
+ if( multifile || opt.file_is_digest) /* have list of filenames */
inp = NULL; /* we do it later */
else {
inp = iobuf_open(fname);
@@ -1100,7 +1117,7 @@ sign_file (ctrl_t ctrl, strlist_t filena
for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next)
gcry_md_enable (mfx.md, hash_for (sk_rover->pk));
- if( !multifile )
+ if( !multifile && !opt.file_is_digest )
iobuf_push_filter( inp, md_filter, &mfx );
if( detached && !encryptflag)
@@ -1155,6 +1172,8 @@ sign_file (ctrl_t ctrl, strlist_t filena
write_status_begin_signing (mfx.md);
+ sigclass = opt.textmode && !outfile? 0x01 : 0x00;
+
/* Setup the inner packet. */
if( detached ) {
if( multifile ) {
@@ -1195,6 +1214,45 @@ sign_file (ctrl_t ctrl, strlist_t filena
if( opt.verbose )
log_printf ("\n");
}
+ else if (opt.file_is_digest) {
+ byte *mdb, ts[5];
+ size_t mdlen;
+ const char *fp;
+ int c, d;
+
+ gcry_md_final(mfx.md);
+ /* this assumes gcry_md_read returns the same buffer */
+ mdb = gcry_md_read(mfx.md, opt.def_digest_algo);
+ mdlen = gcry_md_get_algo_dlen(opt.def_digest_algo);
+ if (strlen(fname) != mdlen * 2 + 11)
+ log_bug("digests must be %zu + @ + 5 bytes\n", mdlen);
+ d = -1;
+ for (fp = fname ; *fp; ) {
+ c = *fp++;
+ if (c >= '0' && c <= '9')
+ c -= '0';
+ else if (c >= 'a' && c <= 'f')
+ c -= 'a' - 10;
+ else if (c >= 'A' && c <= 'F')
+ c -= 'A' - 10;
+ else
+ log_bug("filename is not hex\n");
+ if (d >= 0) {
+ *mdb++ = d << 4 | c;
+ c = -1;
+ if (--mdlen == 0) {
+ mdb = ts;
+ if (*fp++ != '@')
+ log_bug("missing time separator\n");
+ }
+ }
+ d = c;
+ }
+ sigclass = ts[0];
+ if (sigclass != 0x00 && sigclass != 0x01)
+ log_bug("bad cipher class\n");
+ timestamp = buf32_to_u32(ts + 1);
+ }
else {
/* read, so that the filter can calculate the digest */
while( iobuf_get(inp) != -1 )
@@ -1213,8 +1271,8 @@ sign_file (ctrl_t ctrl, strlist_t filena
/* write the signatures */
rc = write_signature_packets (ctrl, sk_list, out, mfx.md,
- opt.textmode && !outfile? 0x01 : 0x00,
- 0, duration, detached ? 'D':'S', NULL);
+ sigclass,
+ timestamp, duration, detached ? 'D':'S', NULL);
if( rc )
goto leave;