From 773107eccfa7f0da8547b2c5efe8cce996a35a91 Mon Sep 17 00:00:00 2001
From: zhoushuiqing <zhoushuiqing2@huawei.com>
Date: Fri, 16 Jun 2023 11:35:21 +0800
Subject: [PATCH] Add IMA digest list support

Signed-off-by: xuce <xuce10@h-partners.com>
---
 build/files.c           | 305 ++++++++++++++++++++++++++++++++++++++--
 build/parsePreamble.c   |   3 +-
 macros.in               |   1 +
 plugins/Makefile.am     |   4 +
 rpmio/rpmpgp_internal.c |  32 +----
 rpmio/rpmpgp_internal.h |  29 ++++
 6 files changed, 334 insertions(+), 40 deletions(-)

diff --git a/build/files.c b/build/files.c
index 44ac155..53a26b2 100644
--- a/build/files.c
+++ b/build/files.c
@@ -50,6 +50,8 @@
 #define DEBUG_LIB_PREFIX	"/usr/lib/debug/"
 #define DEBUG_ID_DIR		"/usr/lib/debug/.build-id"
 #define DEBUG_DWZ_DIR 		"/usr/lib/debug/.dwz"
+#define DIGEST_LIST_DIR		"/.digest_lists"
+#define DEST_DIGEST_LIST_DIR	"/etc/ima/digest_lists"
 
 #undef HASHTYPE
 #undef HTKEYTYPE
@@ -129,6 +131,8 @@ typedef struct AttrRec_s {
 
 /* list of files */
 static StringBuf check_fileList = NULL;
+/* list of files per binary package */
+static StringBuf check_fileList_bin_pkg = NULL;
 
 typedef struct FileEntry_s {
     rpmfileAttrs attrFlags;
@@ -193,6 +197,10 @@ typedef struct FileList_s {
     struct FileEntry_s cur;
 } * FileList;
 
+static char *digest_list_dir;
+
+static int genDigestList(Header header, FileList fl, StringBuf fileList);
+
 static void nullAttrRec(AttrRec ar)
 {
     memset(ar, 0, sizeof(*ar));
@@ -993,6 +1001,139 @@ static int seenHardLink(FileRecords files, FileListRec flp, rpm_ino_t *fileid)
  * @param pkg		(sub) package
  * @param isSrc		pass 1 for source packages 0 otherwise
  */
+static void genDigestListInput(FileList fl, Package pkg, int isSrc)
+{
+    FileListRec flp;
+    char buf[BUFSIZ];
+    char file_info[BUFSIZ];
+    char file_digest[128 * 2 + 1];
+    int i, gen_digest_lists = 1;
+    uint32_t defaultalgo = PGPHASHALGO_MD5, digestalgo;
+    Header h = pkg->header; /* just a shortcut */
+
+    /*
+     * See if non-md5 file digest algorithm is requested. If not
+     * specified, quietly assume md5. Otherwise check if supported type.
+     */
+    digestalgo = rpmExpandNumeric(isSrc ? "%{_source_filedigest_algorithm}" :
+                                         "%{_binary_filedigest_algorithm}");
+    if (digestalgo == 0) {
+       digestalgo = defaultalgo;
+    }
+
+    if (rpmDigestLength(digestalgo) == 0) {
+       rpmlog(RPMLOG_WARNING,
+              _("Unknown file digest algorithm %u, falling back to MD5\n"),
+              digestalgo);
+       digestalgo = defaultalgo;
+    }
+
+    /* Sort the big list */
+    if (fl->files.recs) {
+       qsort(fl->files.recs, fl->files.used,
+             sizeof(*(fl->files.recs)), compareFileListRecs);
+    }
+
+    /* Generate the header. */
+    for (i = 0, flp = fl->files.recs; i < fl->files.used; i++, flp++) {
+       /* Merge duplicate entries. */
+       while (i < (fl->files.used - 1) &&
+           rstreq(flp->cpioPath, flp[1].cpioPath)) {
+
+           /* Two entries for the same file found, merge the entries. */
+           /* Note that an %exclude is a duplication of a file reference */
+
+           /* file flags */
+           flp[1].flags |= flp->flags;
+
+           if (!(flp[1].flags & RPMFILE_EXCLUDE))
+               rpmlog(RPMLOG_WARNING, _("File listed twice: %s\n"),
+                       flp->cpioPath);
+
+           /* file mode */
+           if (S_ISDIR(flp->fl_mode)) {
+               if ((flp[1].specdFlags & (SPECD_DIRMODE | SPECD_DEFDIRMODE)) <
+                   (flp->specdFlags & (SPECD_DIRMODE | SPECD_DEFDIRMODE)))
+                       flp[1].fl_mode = flp->fl_mode;
+           } else {
+               if ((flp[1].specdFlags & (SPECD_FILEMODE | SPECD_DEFFILEMODE)) <
+                   (flp->specdFlags & (SPECD_FILEMODE | SPECD_DEFFILEMODE)))
+                       flp[1].fl_mode = flp->fl_mode;
+           }
+
+           /* uid */
+           if ((flp[1].specdFlags & (SPECD_UID | SPECD_DEFUID)) <
+               (flp->specdFlags & (SPECD_UID | SPECD_DEFUID)))
+           {
+               flp[1].fl_uid = flp->fl_uid;
+               flp[1].uname = flp->uname;
+           }
+
+           /* gid */
+           if ((flp[1].specdFlags & (SPECD_GID | SPECD_DEFGID)) <
+               (flp->specdFlags & (SPECD_GID | SPECD_DEFGID)))
+           {
+               flp[1].fl_gid = flp->fl_gid;
+               flp[1].gname = flp->gname;
+           }
+
+           /* verify flags */
+           if ((flp[1].specdFlags & (SPECD_VERIFY | SPECD_DEFVERIFY)) <
+               (flp->specdFlags & (SPECD_VERIFY | SPECD_DEFVERIFY)))
+                   flp[1].verifyFlags = flp->verifyFlags;
+
+           /* XXX to-do: language */
+
+           flp++; i++;
+       }
+
+       /* Skip files that were marked with %exclude. */
+       if (flp->flags & RPMFILE_EXCLUDE)
+       {
+           argvAdd(&pkg->fileExcludeList, flp->cpioPath);
+           continue;
+       }
+
+       buf[0] = '\0';
+       if (S_ISREG(flp->fl_mode) && !(flp->flags & RPMFILE_GHOST))
+           (void) rpmDoDigest(digestalgo, flp->diskPath, 1,
+                              (unsigned char *)buf);
+       headerPutString(h, RPMTAG_FILEDIGESTS, buf);
+       snprintf(file_digest, sizeof(file_digest), "%s", buf);
+
+       if (check_fileList_bin_pkg && S_ISREG(flp->fl_mode) &&
+               !(flp->flags & RPMFILE_GHOST)) {
+           appendStringBuf(check_fileList_bin_pkg, "path=");
+           appendStringBuf(check_fileList_bin_pkg, flp->diskPath);
+           snprintf(file_info, sizeof(file_info),
+               "|digestalgopgp=%d|digest=%s|mode=%d"
+               "|uname=%s|gname=%s|caps=%s\n",
+               digestalgo, file_digest, flp->fl_mode,
+               rpmstrPoolStr(fl->pool, flp->uname),
+               rpmstrPoolStr(fl->pool, flp->gname), flp->caps &&
+               strlen(flp->caps) ? flp->caps : "");
+           appendStringBuf(check_fileList_bin_pkg, file_info);
+       }
+
+       if (S_ISREG(flp->fl_mode) &&
+           !strncmp(flp->cpioPath, DEST_DIGEST_LIST_DIR,
+                    sizeof(DEST_DIGEST_LIST_DIR) - 1))
+               gen_digest_lists = 0;
+    }
+
+    if (gen_digest_lists &&
+               genDigestList(pkg->header, fl, check_fileList_bin_pkg) > 0)
+       fl->processingFailed = 1;
+}
+
+/**
+ * Add file entries to header.
+ * @todo Should directories have %doc/%config attributes? (#14531)
+ * @todo Remove RPMTAG_OLDFILENAMES, add dirname/basename instead.
+ * @param fl           package file tree walk data
+ * @param pkg          (sub) package
+ * @param isSrc                pass 1 for source packages 0 otherwise
+ */
 static void genCpioListAndHeader(FileList fl, Package pkg, int isSrc)
 {
     FileListRec flp;
@@ -1005,6 +1146,11 @@ static void genCpioListAndHeader(FileList fl, Package pkg, int isSrc)
     int override_date = 0;
     time_t source_date_epoch = 0;
     char *srcdate = getenv("SOURCE_DATE_EPOCH");
+    struct rpmtd_s oldfiledigests;
+
+    headerGet(h, RPMTAG_FILEDIGESTS, &oldfiledigests, HEADERGET_ALLOC);
+    headerDel(h, RPMTAG_FILEDIGESTS);
+    rpmtdInit(&oldfiledigests);
 
     /* Limit the maximum date to SOURCE_DATE_EPOCH if defined
      * similar to the tar --clamp-mtime option
@@ -1203,13 +1349,18 @@ static void genCpioListAndHeader(FileList fl, Package pkg, int isSrc)
 	if (fl->haveCaps) {
 	    headerPutString(h, RPMTAG_FILECAPS, flp->caps);
 	}
-	
+
 	buf[0] = '\0';
-	if (S_ISREG(flp->fl_mode) && !(flp->flags & RPMFILE_GHOST))
-	    (void) rpmDoDigest(digestalgo, flp->diskPath, 1, 
-			       (unsigned char *)buf);
-	headerPutString(h, RPMTAG_FILEDIGESTS, buf);
-	
+	if (strstr(flp->diskPath, DIGEST_LIST_DIR) || !oldfiledigests.count) {
+	    if (S_ISREG(flp->fl_mode) && !(flp->flags & RPMFILE_GHOST))
+	        (void) rpmDoDigest(digestalgo, flp->diskPath, 1,
+				   (unsigned char *)buf);
+	    headerPutString(h, RPMTAG_FILEDIGESTS, buf);
+	} else {
+	    headerPutString(h, RPMTAG_FILEDIGESTS,
+			    rpmtdNextString(&oldfiledigests));
+	}
+
 	buf[0] = '\0';
 	if (S_ISLNK(flp->fl_mode)) {
 	    ssize_t llen = readlink(flp->diskPath, buf, BUFSIZ-1);
@@ -1250,6 +1401,7 @@ static void genCpioListAndHeader(FileList fl, Package pkg, int isSrc)
 
 	headerPutUint32(h, RPMTAG_FILEFLAGS, &(flp->flags) ,1);
     }
+
     pkg->dpaths[npaths] = NULL;
 
     if (totalFileSize < UINT32_MAX) {
@@ -1287,6 +1439,7 @@ static void genCpioListAndHeader(FileList fl, Package pkg, int isSrc)
 	/* Binary packages with dirNames cannot be installed by legacy rpm. */
 	(void) rpmlibNeedsFeature(pkg, "CompressedFileNames", "3.0.4-1");
     }
+    rpmtdFreeData(&oldfiledigests);
 }
 
 static FileRecords FileRecordsFree(FileRecords files)
@@ -1361,8 +1514,8 @@ static int validFilename(const char *fn)
  * @param statp		file stat (possibly NULL)
  * @return		RPMRC_OK on success
  */
-static rpmRC addFile(FileList fl, const char * diskPath,
-		struct stat * statp)
+static rpmRC addFile_common(FileList fl, const char * diskPath,
+		struct stat * statp, int digest_list)
 {
     size_t plen = strlen(diskPath);
     char buf[plen + 1];
@@ -1373,6 +1526,10 @@ static rpmRC addFile(FileList fl, const char * diskPath,
     gid_t fileGid;
     const char *fileUname;
     const char *fileGname;
+    char realPath[PATH_MAX];
+    int digest_list_prefix = 0;
+    struct stat st;
+    int exclude = 0;
     rpmRC rc = RPMRC_FAIL; /* assume failure */
 
     /* Strip trailing slash. The special case of '/' path is handled below. */
@@ -1408,6 +1565,33 @@ static rpmRC addFile(FileList fl, const char * diskPath,
     if (*cpioPath == '\0')
 	cpioPath = "/";
 
+    snprintf(realPath, sizeof(realPath), "%s", diskPath);
+    rpmCleanPath(realPath);
+
+    digest_list_prefix = (!strncmp(realPath, digest_list_dir,
+			  strlen(digest_list_dir)));
+
+    if ((!digest_list && digest_list_prefix) ||
+	(digest_list && !digest_list_prefix)) {
+	    rc = RPMRC_OK;
+	    goto exit;
+    }
+
+    if (digest_list) {
+	if (strncmp(cpioPath, DIGEST_LIST_DIR, sizeof(DIGEST_LIST_DIR) - 1)) {
+	    rc = RPMRC_OK;
+	    goto exit;
+	}
+
+	cpioPath += sizeof(DIGEST_LIST_DIR) - 1;
+
+	snprintf(realPath, sizeof(realPath), "%.*s%s",
+		 (int)(strlen(digest_list_dir) - sizeof(DIGEST_LIST_DIR) + 1),
+		 digest_list_dir, cpioPath);
+	if (!stat(realPath, &st))
+	    exclude = 1;
+    }
+
     /*
      * Unless recursing, we dont have stat() info at hand. Handle the
      * various cases, preserving historical behavior wrt %dev():
@@ -1545,6 +1729,8 @@ static rpmRC addFile(FileList fl, const char * diskPath,
 	}
 
 	flp->flags = fl->cur.attrFlags;
+	if (exclude)
+	    flp->flags |= RPMFILE_EXCLUDE;
 	flp->specdFlags = fl->cur.specdFlags;
 	flp->verifyFlags = fl->cur.verifyFlags;
 
@@ -1565,6 +1751,32 @@ exit:
     return rc;
 }
 
+/**
+ * Add a file to the package manifest.
+ * @param fl		package file tree walk data
+ * @param diskPath	path to file
+ * @param statp		file stat (possibly NULL)
+ * @return		RPMRC_OK on success
+ */
+static rpmRC addFile(FileList fl, const char * diskPath,
+		struct stat * statp)
+{
+	return addFile_common(fl, diskPath, statp, 0);
+}
+
+/**
+ * Add a digest list to the package manifest.
+ * @param fl		package file tree walk data
+ * @param diskPath	path to digest list
+ * @param statp		file stat (possibly NULL)
+ * @return		RPMRC_OK on success
+ */
+static rpmRC addDigestList(FileList fl, const char * diskPath,
+		struct stat * statp)
+{
+	return addFile_common(fl, diskPath, statp, 1);
+}
+
 /**
  * Add directory (and all of its files) to the package manifest.
  * @param fl		package file tree walk data
@@ -2586,6 +2798,61 @@ static void addPackageFileList (struct FileList_s *fl, Package pkg,
     argvFree(fileNames);
 }
 
+/**
+ * Generate digest lists list for current binary package.
+ * @header		package header
+ * @fl			file list
+ * @param fileList	packaged file list
+ * @return		-1 if skipped, 0 on OK, 1 on error
+ */
+static int genDigestList(Header header, FileList fl, StringBuf fileList)
+{
+    const char *errorString;
+    char *binFormat = rpmGetPath("%{_rpmfilename}", NULL);
+    char *binRpm = headerFormat(header, binFormat, &errorString);
+    static char * av_brp[] = { "%{?__brp_digest_list}", DIGEST_LIST_DIR + 1, NULL, NULL };
+    StringBuf sb_stdout = NULL;
+    int rc = -1;
+    char * s = rpmExpand(av_brp[0], NULL);
+
+    if (!(s && *s))
+	goto exit;
+
+    if (!strchr(binRpm, '/'))
+	goto exit;
+
+    av_brp[2] = strchr(binRpm, '/') + 1;
+    rpmlog(RPMLOG_NOTICE, _("Generating digest list: %s\n"), s);
+
+    rc = rpmfcExec(av_brp, fileList, &sb_stdout, 0, binRpm);
+    if (sb_stdout && getStringBuf(sb_stdout)) {
+	const char * t = getStringBuf(sb_stdout), *ptr;
+	char *digest_list_path;
+
+	while((ptr = strchr(t, '\n'))) {
+	    digest_list_path = strndup(t, ptr - t);
+	    if (!digest_list_path) {
+		rc = -1;
+		goto exit;
+	    }
+	    FileEntryFree(&fl->cur);
+	    resetPackageFilesDefaults(fl, fl->pkgFlags);
+	    rc = addDigestList(fl, digest_list_path, NULL);
+	    free(digest_list_path);
+	    if (rc != RPMRC_OK)
+		break;
+
+	    t = ptr + 1;
+	}
+    }
+exit:
+    free(binFormat);
+    free(binRpm);
+    free(s);
+    freeStringBuf(sb_stdout);
+    return rc;
+}
+
 static rpmRC processPackageFiles(rpmSpec spec, rpmBuildPkgFlags pkgFlags,
 				 Package pkg, int didInstall, int test)
 {
@@ -2599,6 +2866,10 @@ static rpmRC processPackageFiles(rpmSpec spec, rpmBuildPkgFlags pkgFlags,
 	if (readFilesManifest(spec, pkg, *fp))
 	    return RPMRC_FAIL;
     }
+
+    /* Init the buffer containing the list of packaged files */
+    check_fileList_bin_pkg = newStringBuf();
+
     /* Init the file list structure */
     memset(&fl, 0, sizeof(fl));
 
@@ -2654,12 +2925,17 @@ static rpmRC processPackageFiles(rpmSpec spec, rpmBuildPkgFlags pkgFlags,
     if (checkHardLinks(&fl.files))
 	(void) rpmlibNeedsFeature(pkg, "PartialHardlinkSets", "4.0.4-1");
 
+    genDigestListInput(&fl, pkg, 0);
+    if (fl.processingFailed)
+	goto exit;
+
     genCpioListAndHeader(&fl, pkg, 0);
 
 exit:
     FileListFree(&fl);
     specialDirFree(specialDoc);
     specialDirFree(specialLic);
+    freeStringBuf(check_fileList_bin_pkg);
     return fl.processingFailed ? RPMRC_FAIL : RPMRC_OK;
 }
 
@@ -3128,6 +3404,7 @@ static void addPackageDeps(Package from, Package to, enum rpmTag_e tag)
 rpmRC processBinaryFiles(rpmSpec spec, rpmBuildPkgFlags pkgFlags,
 			int didInstall, int test)
 {
+    struct stat st;
     Package pkg;
     rpmRC rc = RPMRC_OK;
     char *buildroot;
@@ -3144,7 +3421,14 @@ rpmRC processBinaryFiles(rpmSpec spec, rpmBuildPkgFlags pkgFlags,
     check_fileList = newStringBuf();
     genSourceRpmName(spec);
     buildroot = rpmGenPath(spec->rootDir, spec->buildRoot, NULL);
-    
+
+    digest_list_dir = rpmGenPath(buildroot, DIGEST_LIST_DIR, NULL);
+    if (!digest_list_dir)
+	goto exit;
+
+    if (!stat(digest_list_dir, &st))
+	rpmlog(RPMLOG_NOTICE, _("Ignoring files in: %s\n"), digest_list_dir);
+
     if (rpmExpandNumeric("%{?_debuginfo_subpackages}")) {
 	maindbg = findDebuginfoPackage(spec);
 	if (maindbg) {
@@ -3250,6 +3534,7 @@ exit:
     check_fileList = freeStringBuf(check_fileList);
     _free(buildroot);
     _free(uniquearch);
-    
+    _free(digest_list_dir);
+
     return rc;
 }
diff --git a/build/parsePreamble.c b/build/parsePreamble.c
index 729fd4f..306a029 100644
--- a/build/parsePreamble.c
+++ b/build/parsePreamble.c
@@ -801,7 +801,8 @@ static rpmRC handlePreambleTag(rpmSpec spec, Package pkg, rpmTagVal tag,
 	SINGLE_TOKEN_ONLY;
         if (tag == RPMTAG_RELEASE) {
             char *dist = rpmExpand("%{?dist}",NULL);
-            rasprintf(&field,"%s%s",field,dist);
+            rasprintf(&field,"%s%s",field,
+                      (dist && strstr(field, dist)) ? "" : dist);
             free(dist);
         }
 	if (rpmCharCheck(spec, field, ALLOWED_CHARS_VERREL, NULL))
diff --git a/macros.in b/macros.in
index 4c7073c..6093898 100644
--- a/macros.in
+++ b/macros.in
@@ -1155,6 +1155,7 @@ package or when debugging this package.\
 %__transaction_prioreset	%{__plugindir}/prioreset.so
 %__transaction_audit		%{__plugindir}/audit.so
 %__transaction_dbus_announce	%{__plugindir}/dbus_announce.so
+%__transaction_digest_list	%{__plugindir}/digest_list.so
 
 #------------------------------------------------------------------------------
 # Macros for further automated spec %setup and patch application
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 822c7d2..161fe4c 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -69,3 +69,7 @@ audit_la_sources = audit.c
 audit_la_LIBADD = $(top_builddir)/lib/librpm.la $(top_builddir)/rpmio/librpmio.la @WITH_AUDIT_LIB@
 plugins_LTLIBRARIES += audit.la
 endif
+
+digest_list_la_sources = digest_list.c
+digest_list_la_LIBADD = $(top_builddir)/lib/librpm.la $(top_builddir)/rpmio/librpmio.la
+plugins_LTLIBRARIES += digest_list.la
diff --git a/rpmio/rpmpgp_internal.c b/rpmio/rpmpgp_internal.c
index 0fcd220..63d065a 100644
--- a/rpmio/rpmpgp_internal.c
+++ b/rpmio/rpmpgp_internal.c
@@ -19,34 +19,6 @@
 
 static int _print = 0;
 
-/** \ingroup rpmio
- * Values parsed from OpenPGP signature/pubkey packet(s).
- */
-struct pgpDigParams_s {
-    char * userid;
-    uint8_t * hash;
-    uint8_t tag;
-
-    uint8_t key_flags;		/*!< key usage flags */
-    uint8_t version;		/*!< version number. */
-    uint32_t time;		/*!< key/signature creation time. */
-    uint8_t pubkey_algo;		/*!< public key algorithm. */
-
-    uint8_t hash_algo;
-    uint8_t sigtype;
-    uint32_t hashlen;
-    uint8_t signhash16[2];
-    pgpKeyID_t signid;
-    uint8_t saved;		/*!< Various flags.  `PGPDIG_SAVED_*` are never reset.
-				 * `PGPDIG_SIG_HAS_*` are reset for each signature. */
-#define	PGPDIG_SAVED_TIME	(1 << 0)
-#define	PGPDIG_SAVED_ID		(1 << 1)
-#define	PGPDIG_SIG_HAS_CREATION_TIME	(1 << 2)
-#define	PGPDIG_SIG_HAS_KEY_FLAGS	(1 << 3)
-
-    pgpDigAlg alg;
-};
-
 /** \ingroup rpmio
  * Container for values parsed from an OpenPGP signature and public key.
  */
@@ -484,6 +456,7 @@ static int pgpPrtSig(pgpTag tag, const uint8_t *h, size_t hlen,
 	}
 
 	p = ((uint8_t *)v) + sizeof(*v);
+	_digp->data = p;
 	rc = tag ? pgpPrtSigParams(tag, v->pubkey_algo, p, h, hlen, _digp) : 0;
     }	break;
     case 4:
@@ -545,7 +518,7 @@ static int pgpPrtSig(pgpTag tag, const uint8_t *h, size_t hlen,
 	p += 2;
 	if (p > hend)
 	    return 1;
-
+	_digp->data = p;
 	rc = tag ? pgpPrtSigParams(tag, v->pubkey_algo, p, h, hlen, _digp) : 0;
     }	break;
     default:
@@ -641,6 +614,7 @@ static int pgpPrtKey(pgpTag tag, const uint8_t *h, size_t hlen,
 	    }
 
 	    p = ((uint8_t *)v) + sizeof(*v);
+	    _digp->data = p;
 	    rc = pgpPrtPubkeyParams(v->pubkey_algo, p, h, hlen, _digp);
 	}
     }	break;
diff --git a/rpmio/rpmpgp_internal.h b/rpmio/rpmpgp_internal.h
index 64b50de..67fecb0 100644
--- a/rpmio/rpmpgp_internal.h
+++ b/rpmio/rpmpgp_internal.h
@@ -10,6 +10,35 @@ typedef int (*verifyfunc)(pgpDigAlg pgpkey, pgpDigAlg pgpsig,
                           uint8_t *hash, size_t hashlen, int hash_algo);
 typedef void (*freefunc)(pgpDigAlg digp);
 
+/** \ingroup rpmio
+ * Values parsed from OpenPGP signature/pubkey packet(s).
+ */
+struct pgpDigParams_s {
+    char * userid;
+    uint8_t * hash;
+    const uint8_t * data;
+    uint8_t tag;
+
+    uint8_t key_flags;          /*!< key usage flags */
+    uint8_t version;            /*!< version number. */
+    uint32_t time;              /*!< key/signature creation time. */
+    uint8_t pubkey_algo;                /*!< public key algorithm. */
+
+    uint8_t hash_algo;
+    uint8_t sigtype;
+    uint32_t hashlen;
+    uint8_t signhash16[2];
+    pgpKeyID_t signid;
+    uint8_t saved;              /*!< Various flags.  `PGPDIG_SAVED_*` are never reset.
+                                 * `PGPDIG_SIG_HAS_*` are reset for each signature. */
+#define PGPDIG_SAVED_TIME       (1 << 0)
+#define PGPDIG_SAVED_ID         (1 << 1)
+#define PGPDIG_SIG_HAS_CREATION_TIME    (1 << 2)
+#define PGPDIG_SIG_HAS_KEY_FLAGS        (1 << 3)
+
+    pgpDigAlg alg;
+};
+
 struct pgpDigAlg_s {
     setmpifunc setmpi;
     verifyfunc verify;
-- 
2.43.0