keybox-blob.c
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keybox-blob.c
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	/* keybox-blob.c - KBX Blob handling
	* Copyright (C) 2000, 2001, 2002, 2003, 2008 Free Software Foundation, Inc.
	*
	* This file is part of GnuPG.
	*
	* GnuPG is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 3 of the License, or
	* (at your option) any later version.
	*
	* GnuPG is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	/*
	* The keybox data format

	The KeyBox uses an augmented OpenPGP/X.509 key format. This makes
	random access to a keyblock/certificate easier and also gives the
	opportunity to store additional information (e.g. the fingerprint)
	along with the key. All integers are stored in network byte order,
	offsets are counted from the beginning of the Blob.

	** Overview of blob types

	\| Byte 4 \| Blob type \|
	\|--------+--------------\|
	\| 0 \| Empty blob \|
	\| 1 \| First blob \|
	\| 2 \| OpenPGP blob \|
	\| 3 \| X.509 blob \|

	** The First blob

	The first blob of a plain KBX file has a special format:

	- u32 Length of this blob
	- byte Blob type (1)
	- byte Version number (1)
	- byte RFU
	- byte RFU
	- b4 Magic 'KBXf'
	- u32 RFU
	- u32 file_created_at
	- u32 last_maintenance_run
	- u32 RFU
	- u32 RFU

	** The OpenPGP and X.509 blobs

	The OpenPGP and X.509 blobs are very similiar, things which are
	X.509 specific are noted like [X.509: xxx]

	- u32 Length of this blob (including these 4 bytes)
	- byte Blob type
	2 = OpenPGP
	3 = X509
	- byte Version number of this blob type
	1 = The only defined value
	- u16 Blob flags
	bit 0 = contains secret key material (not used)
	bit 1 = ephemeral blob (e.g. used while quering external resources)
	- u32 Offset to the OpenPGP keyblock or the X.509 DER encoded
	certificate
	- u32 The length of the keyblock or certificate
	- u16 [NKEYS] Number of keys (at least 1!) [X509: always 1]
	- u16 Size of the key information structure (at least 28).
	- NKEYS times:
	- b20 The fingerprint of the key.
	Fingerprints are always 20 bytes, MD5 left padded with zeroes.
	- u32 Offset to the n-th key's keyID (a keyID is always 8 byte)
	or 0 if not known which is the case only for X.509.
	- u16 Key flags
	bit 0 = qualified signature (not yet implemented}
	- u16 RFU
	- bN Optional filler up to the specified length of this
	structure.
	- u16 Size of the serial number (may be zero)
	- bN The serial number. N as giiven above.
	- u16 Number of user IDs
	- u16 [NUIDS] Size of user ID information structure
	- NUIDS times:

	For X509, the first user ID is the Issuer, the second the
	Subject and the others are subjectAltNames. For OpenPGP we only
	store the information from UserID packets here.

	- u32 Blob offset to the n-th user ID
	- u32 Length of this user ID.
	- u16 User ID flags.
	(not yet used)
	- byte Validity
	- byte RFU

	- u16 [NSIGS] Number of signatures
	- u16 Size of signature information (4)
	- NSIGS times:
	- u32 Expiration time of signature with some special values:
	- 0x00000000 = not checked
	- 0x00000001 = missing key
	- 0x00000002 = bad signature
	- 0x10000000 = valid and expires at some date in 1978.
	- 0xffffffff = valid and does not expire
	- u8 Assigned ownertrust [X509: not used]
	- u8 All_Validity
	OpenPGP: See ../g10/trustdb/TRUST_* [not yet used]
	X509: Bit 4 set := key has been revoked.
	Note that this value matches TRUST_FLAG_REVOKED
	- u16 RFU
	- u32 Recheck_after
	- u32 Latest timestamp in the keyblock (useful for KS syncronsiation?)
	- u32 Blob created at
	- u32 [NRES] Size of reserved space (not including this field)
	- bN Reserved space of size NRES for future use.
	- bN Arbitrary space for example used to store data which is not
	part of the keyblock or certificate. For example the v3 key
	IDs go here.
	- bN Space for the keyblock or certificate.
	- bN RFU. This is the remaining space after keyblock and before
	the checksum. Is is not covered by the checksum.
	- b20 SHA-1 checksum (useful for KS syncronisation?)
	Note, that KBX versions before GnuPG 2.1 used an MD5
	checksum. However it was only created but never checked.
	Thus we do not expect problems if we switch to SHA-1. If
	the checksum fails and the first 4 bytes are zero, we can
	try again with MD5. SHA-1 has the advantage that it is
	faster on CPUs with dedicated SHA-1 support.


	*/


	#include <config.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <assert.h>
	#include <time.h>

	#include "keybox-defs.h"
	#include <gcrypt.h>

	#ifdef KEYBOX_WITH_X509
	#include <ksba.h>
	#endif


	#include "../common/gettime.h"


	/* special values of the signature status */
	#define SF_NONE(a) ( !(a) )
	#define SF_NOKEY(a) ((a) & (1<<0))
	#define SF_BAD(a) ((a) & (1<<1))
	#define SF_VALID(a) ((a) & (1<<29))


	struct membuf {
	size_t len;
	size_t size;
	char *buf;
	int out_of_core;
	};


	/* #if MAX_FINGERPRINT_LEN < 20 */
	/* #error fingerprints are 20 bytes */
	/* #endif */

	struct keyboxblob_key {
	char fpr[20];
	u32 off_kid;
	ulong off_kid_addr;
	u16 flags;
	};
	struct keyboxblob_uid {
	u32 off;
	ulong off_addr;
	char name; / used only with x509 */
	u32 len;
	u16 flags;
	byte validity;
	};

	struct keyid_list {
	struct keyid_list *next;
	int seqno;
	byte kid[8];
	};

	struct fixup_list {
	struct fixup_list *next;
	u32 off;
	u32 val;
	};


	struct keyboxblob {
	byte *blob;
	size_t bloblen;
	off_t fileoffset;

	/* stuff used only by keybox_create_blob */
	unsigned char *serialbuf;
	const unsigned char *serial;
	size_t seriallen;
	int nkeys;
	struct keyboxblob_key *keys;
	int nuids;
	struct keyboxblob_uid *uids;
	int nsigs;
	u32 *sigs;
	struct fixup_list *fixups;
	int fixup_out_of_core;

	struct keyid_list *temp_kids;
	struct membuf bufbuf; /* temporary store for the blob */
	struct membuf *buf;
	};



	/* A simple implemention of a dynamic buffer. Use init_membuf() to
	create a buffer, put_membuf to append bytes and get_membuf to
	release and return the buffer. Allocation errors are detected but
	only returned at the final get_membuf(), this helps not to clutter
	the code with out of core checks. */

	static void
	init_membuf (struct membuf *mb, int initiallen)
	{
	mb->len = 0;
	mb->size = initiallen;
	mb->out_of_core = 0;
	mb->buf = xtrymalloc (initiallen);
	if (!mb->buf)
	mb->out_of_core = 1;
	}

	static void
	put_membuf (struct membuf mb, const void buf, size_t len)
	{
	if (mb->out_of_core)
	return;

	if (mb->len + len >= mb->size)
	{
	char *p;

	mb->size += len + 1024;
	p = xtryrealloc (mb->buf, mb->size);
	if (!p)
	{
	mb->out_of_core = 1;
	return;
	}
	mb->buf = p;
	}
	if (buf)
	memcpy (mb->buf + mb->len, buf, len);
	else
	memset (mb->buf + mb->len, 0, len);
	mb->len += len;
	}

	static void *
	get_membuf (struct membuf mb, size_t len)
	{
	char *p;

	if (mb->out_of_core)
	{
	xfree (mb->buf);
	mb->buf = NULL;
	return NULL;
	}

	p = mb->buf;
	*len = mb->len;
	mb->buf = NULL;
	mb->out_of_core = 1; /* don't allow a reuse */
	return p;
	}


	static void
	put8 (struct membuf *mb, byte a )
	{
	put_membuf (mb, &a, 1);
	}

	static void
	put16 (struct membuf *mb, u16 a )
	{
	unsigned char tmp[2];
	tmp[0] = a>>8;
	tmp[1] = a;
	put_membuf (mb, tmp, 2);
	}

	static void
	put32 (struct membuf *mb, u32 a )
	{
	unsigned char tmp[4];
	tmp[0] = a>>24;
	tmp[1] = a>>16;
	tmp[2] = a>>8;
	tmp[3] = a;
	put_membuf (mb, tmp, 4);
	}



	/* Store a value in the fixup list */
	static void
	add_fixup (KEYBOXBLOB blob, u32 off, u32 val)
	{
	struct fixup_list *fl;

	if (blob->fixup_out_of_core)
	return;

	fl = xtrycalloc(1, sizeof *fl);
	if (!fl)
	blob->fixup_out_of_core = 1;
	else
	{
	fl->off = off;
	fl->val = val;
	fl->next = blob->fixups;
	blob->fixups = fl;
	}
	}



	/*
	OpenPGP specific stuff
	*/


	/* We must store the keyid at some place because we can't calculate
	the offset yet. This is only used for v3 keyIDs. Function returns
	an index value for later fixup or -1 for out of core. The value
	must be a non-zero value. */
	static int
	pgp_temp_store_kid (KEYBOXBLOB blob, struct _keybox_openpgp_key_info *kinfo)
	{
	struct keyid_list k, r;

	k = xtrymalloc (sizeof *k);
	if (!k)
	return -1;
	memcpy (k->kid, kinfo->keyid, 8);
	k->seqno = 0;
	k->next = blob->temp_kids;
	blob->temp_kids = k;
	for (r=k; r; r = r->next)
	k->seqno++;

	return k->seqno;
	}


	/* Helper for pgp_create_key_part. */
	static gpg_error_t
	pgp_create_key_part_single (KEYBOXBLOB blob, int n,
	struct _keybox_openpgp_key_info *kinfo)
	{
	size_t fprlen;
	int off;

	fprlen = kinfo->fprlen;
	if (fprlen > 20)
	fprlen = 20;
	memcpy (blob->keys[n].fpr, kinfo->fpr, fprlen);
	if (fprlen != 20) /* v3 fpr - shift right and fill with zeroes. */
	{
	memmove (blob->keys[n].fpr + 20 - fprlen, blob->keys[n].fpr, fprlen);
	memset (blob->keys[n].fpr, 0, 20 - fprlen);
	off = pgp_temp_store_kid (blob, kinfo);
	if (off == -1)
	return gpg_error_from_syserror ();
	blob->keys[n].off_kid = off;
	}
	else
	blob->keys[n].off_kid = 0; /* Will be fixed up later */
	blob->keys[n].flags = 0;
	return 0;
	}


	static gpg_error_t
	pgp_create_key_part (KEYBOXBLOB blob, keybox_openpgp_info_t info)
	{
	gpg_error_t err;
	int n = 0;
	struct _keybox_openpgp_key_info *kinfo;

	err = pgp_create_key_part_single (blob, n++, &info->primary);
	if (err)
	return err;
	if (info->nsubkeys)
	for (kinfo = &info->subkeys; kinfo; kinfo = kinfo->next)
	if ((err=pgp_create_key_part_single (blob, n++, kinfo)))
	return err;

	assert (n == blob->nkeys);
	return 0;
	}


	static void
	pgp_create_uid_part (KEYBOXBLOB blob, keybox_openpgp_info_t info)
	{
	int n = 0;
	struct _keybox_openpgp_uid_info *u;

	if (info->nuids)
	{
	for (u = &info->uids; u; u = u->next)
	{
	blob->uids[n].off = u->off;
	blob->uids[n].len = u->len;
	blob->uids[n].flags = 0;
	blob->uids[n].validity = 0;
	n++;
	}
	}

	assert (n == blob->nuids);
	}


	static void
	pgp_create_sig_part (KEYBOXBLOB blob, u32 *sigstatus)
	{
	int n;

	for (n=0; n < blob->nsigs; n++)
	{
	blob->sigs[n] = sigstatus? sigstatus[n+1] : 0;
	}
	}


	static int
	pgp_create_blob_keyblock (KEYBOXBLOB blob,
	const unsigned char *image, size_t imagelen)
	{
	struct membuf *a = blob->buf;
	int n;
	u32 kbstart = a->len;

	add_fixup (blob, 8, kbstart);

	for (n = 0; n < blob->nuids; n++)
	add_fixup (blob, blob->uids[n].off_addr, kbstart + blob->uids[n].off);

	put_membuf (a, image, imagelen);

	add_fixup (blob, 12, a->len - kbstart);
	return 0;
	}



	#ifdef KEYBOX_WITH_X509
	/*
	X.509 specific stuff
	*/

	/* Write the raw certificate out */
	static int
	x509_create_blob_cert (KEYBOXBLOB blob, ksba_cert_t cert)
	{
	struct membuf *a = blob->buf;
	const unsigned char *image;
	size_t length;
	u32 kbstart = a->len;

	/* Store our offset for later fixup */
	add_fixup (blob, 8, kbstart);

	image = ksba_cert_get_image (cert, &length);
	if (!image)
	return gpg_error (GPG_ERR_GENERAL);
	put_membuf (a, image, length);

	add_fixup (blob, 12, a->len - kbstart);
	return 0;
	}

	#endif /KEYBOX_WITH_X509/

	/* Write a stored keyID out to the buffer */
	static void
	write_stored_kid (KEYBOXBLOB blob, int seqno)
	{
	struct keyid_list *r;

	for ( r = blob->temp_kids; r; r = r->next )
	{
	if (r->seqno == seqno )
	{
	put_membuf (blob->buf, r->kid, 8);
	return;
	}
	}
	never_reached ();
	}

	/* Release a list of key IDs */
	static void
	release_kid_list (struct keyid_list *kl)
	{
	struct keyid_list r, r2;

	for ( r = kl; r; r = r2 )
	{
	r2 = r->next;
	xfree (r);
	}
	}



	static int
	create_blob_header (KEYBOXBLOB blob, int blobtype, int as_ephemeral)
	{
	struct membuf *a = blob->buf;
	int i;

	put32 ( a, 0 ); /* blob length, needs fixup */
	put8 ( a, blobtype);
	put8 ( a, 1 ); /* blob type version */
	put16 ( a, as_ephemeral? 2:0 ); /* blob flags */

	put32 ( a, 0 ); /* offset to the raw data, needs fixup */
	put32 ( a, 0 ); /* length of the raw data, needs fixup */

	put16 ( a, blob->nkeys );
	put16 ( a, 20 + 4 + 2 + 2 ); /* size of key info */
	for ( i=0; i < blob->nkeys; i++ )
	{
	put_membuf (a, blob->keys[i].fpr, 20);
	blob->keys[i].off_kid_addr = a->len;
	put32 ( a, 0 ); /* offset to keyid, fixed up later */
	put16 ( a, blob->keys[i].flags );
	put16 ( a, 0 ); /* reserved */
	}

	put16 (a, blob->seriallen); /fixme: check that it fits into 16 bits/
	if (blob->serial)
	put_membuf (a, blob->serial, blob->seriallen);

	put16 ( a, blob->nuids );
	put16 ( a, 4 + 4 + 2 + 1 + 1 ); /* size of uid info */
	for (i=0; i < blob->nuids; i++)
	{
	blob->uids[i].off_addr = a->len;
	put32 ( a, 0 ); /* offset to userid, fixed up later */
	put32 ( a, blob->uids[i].len );
	put16 ( a, blob->uids[i].flags );
	put8 ( a, 0 ); /* validity */
	put8 ( a, 0 ); /* reserved */
	}

	put16 ( a, blob->nsigs );
	put16 ( a, 4 ); /* size of sig info */
	for (i=0; i < blob->nsigs; i++)
	{
	put32 ( a, blob->sigs[i]);
	}

	put8 ( a, 0 ); /* assigned ownertrust */
	put8 ( a, 0 ); /* validity of all user IDs */
	put16 ( a, 0 ); /* reserved */
	put32 ( a, 0 ); /* time of next recheck */
	put32 ( a, 0 ); /* newest timestamp (none) */
	put32 ( a, make_timestamp() ); /* creation time */
	put32 ( a, 0 ); /* size of reserved space */
	/* reserved space (which is currently of size 0) */

	/* space where we write keyIDs and and other stuff so that the
	pointers can actually point to somewhere */
	if (blobtype == BLOBTYPE_PGP)
	{
	/* We need to store the keyids for all pgp v3 keys because those key
	IDs are not part of the fingerprint. While we are doing that, we
	fixup all the keyID offsets */
	for (i=0; i < blob->nkeys; i++ )
	{
	if (blob->keys[i].off_kid)
	{ /* this is a v3 one */
	add_fixup (blob, blob->keys[i].off_kid_addr, a->len);
	write_stored_kid (blob, blob->keys[i].off_kid);
	}
	else
	{ /* the better v4 key IDs - just store an offset 8 bytes back */
	add_fixup (blob, blob->keys[i].off_kid_addr,
	blob->keys[i].off_kid_addr - 8);
	}
	}
	}

	if (blobtype == BLOBTYPE_X509)
	{
	/* We don't want to point to ASN.1 encoded UserIDs (DNs) but to
	the utf-8 string represenation of them */
	for (i=0; i < blob->nuids; i++ )
	{
	if (blob->uids[i].name)
	{ /* this is a v3 one */
	add_fixup (blob, blob->uids[i].off_addr, a->len);
	put_membuf (blob->buf, blob->uids[i].name, blob->uids[i].len);
	}
	}
	}

	return 0;
	}



	static int
	create_blob_trailer (KEYBOXBLOB blob)
	{
	(void)blob;
	return 0;
	}


	static int
	create_blob_finish (KEYBOXBLOB blob)
	{
	struct membuf *a = blob->buf;
	unsigned char *p;
	unsigned char *pp;
	size_t n;

	/* Write a placeholder for the checksum */
	put_membuf (a, NULL, 20);

	/* get the memory area */
	n = 0; /* (Just to avoid compiler warning.) */
	p = get_membuf (a, &n);
	if (!p)
	return gpg_error (GPG_ERR_ENOMEM);
	assert (n >= 20);

	/* fixup the length */
	add_fixup (blob, 0, n);

	/* do the fixups */
	if (blob->fixup_out_of_core)
	return gpg_error (GPG_ERR_ENOMEM);

	{
	struct fixup_list *fl;
	for (fl = blob->fixups; fl; fl = fl->next)
	{
	assert (fl->off+4 <= n);
	p[fl->off+0] = fl->val >> 24;
	p[fl->off+1] = fl->val >> 16;
	p[fl->off+2] = fl->val >> 8;
	p[fl->off+3] = fl->val;
	}
	}

	/* Compute and store the SHA-1 checksum. */
	gcry_md_hash_buffer (GCRY_MD_SHA1, p + n - 20, p, n - 20);

	pp = xtrymalloc (n);
	if ( !pp )
	return gpg_error_from_syserror ();
	memcpy (pp , p, n);
	blob->blob = pp;
	blob->bloblen = n;

	return 0;
	}



	gpg_error_t
	_keybox_create_openpgp_blob (KEYBOXBLOB *r_blob,
	keybox_openpgp_info_t info,
	const unsigned char *image,
	size_t imagelen,
	u32 *sigstatus,
	int as_ephemeral)
	{
	gpg_error_t err;
	KEYBOXBLOB blob;

	*r_blob = NULL;

	/* If we have a signature status vector, check that the number of
	elements matches the actual number of signatures. */
	if (sigstatus && sigstatus[0] != info->nsigs)
	return gpg_error (GPG_ERR_INTERNAL);

	blob = xtrycalloc (1, sizeof *blob);
	if (!blob)
	return gpg_error_from_syserror ();

	blob->nkeys = 1 + info->nsubkeys;
	blob->keys = xtrycalloc (blob->nkeys, sizeof *blob->keys );
	if (!blob->keys)
	{
	err = gpg_error_from_syserror ();
	goto leave;
	}

	blob->nuids = info->nuids;
	if (blob->nuids)
	{
	blob->uids = xtrycalloc (blob->nuids, sizeof *blob->uids );
	if (!blob->uids)
	{
	err = gpg_error_from_syserror ();
	goto leave;
	}
	}

	blob->nsigs = info->nsigs;
	if (blob->nsigs)
	{
	blob->sigs = xtrycalloc (blob->nsigs, sizeof *blob->sigs );
	if (!blob->sigs)
	{
	err = gpg_error_from_syserror ();
	goto leave;
	}
	}

	err = pgp_create_key_part (blob, info);
	if (err)
	goto leave;
	pgp_create_uid_part (blob, info);
	pgp_create_sig_part (blob, sigstatus);

	init_membuf (&blob->bufbuf, 1024);
	blob->buf = &blob->bufbuf;
	err = create_blob_header (blob, BLOBTYPE_PGP, as_ephemeral);
	if (err)
	goto leave;
	err = pgp_create_blob_keyblock (blob, image, imagelen);
	if (err)
	goto leave;
	err = create_blob_trailer (blob);
	if (err)
	goto leave;
	err = create_blob_finish (blob);
	if (err)
	goto leave;

	leave:
	release_kid_list (blob->temp_kids);
	blob->temp_kids = NULL;
	if (err)
	_keybox_release_blob (blob);
	else
	*r_blob = blob;
	return err;
	}


	#ifdef KEYBOX_WITH_X509

	/* Return an allocated string with the email address extracted from a
	DN. Note hat we use this code also in ../sm/keylist.c. */
	static char *
	x509_email_kludge (const char *name)
	{
	const char p, string;
	unsigned char *buf;
	int n;

	string = name;
	for (;;)
	{
	p = strstr (string, "1.2.840.113549.1.9.1=#");
	if (!p)
	return NULL;
	if (p == name \|\| (p > string+1 && p[-1] == ',' && p[-2] != '\\'))
	{
	name = p + 22;
	break;
	}
	string = p + 22;
	}


	/* This looks pretty much like an email address in the subject's DN
	we use this to add an additional user ID entry. This way,
	OpenSSL generated keys get a nicer and usable listing. */
	for (n=0, p=name; hexdigitp (p) && hexdigitp (p+1); p +=2, n++)
	;
	if (!n)
	return NULL;
	buf = xtrymalloc (n+3);
	if (!buf)
	return NULL; /* oops, out of core */
	*buf = '<';
	for (n=1, p=name; hexdigitp (p); p +=2, n++)
	buf[n] = xtoi_2 (p);
	buf[n++] = '>';
	buf[n] = 0;
	return (char*)buf;
	}



	/* Note: We should move calculation of the digest into libksba and
	remove that parameter */
	int
	_keybox_create_x509_blob (KEYBOXBLOB *r_blob, ksba_cert_t cert,
	unsigned char *sha1_digest, int as_ephemeral)
	{
	int i, rc = 0;
	KEYBOXBLOB blob;
	unsigned char *sn;
	char *p;
	char **names = NULL;
	size_t max_names;

	*r_blob = NULL;
	blob = xtrycalloc (1, sizeof *blob);
	if( !blob )
	return gpg_error_from_syserror ();

	sn = ksba_cert_get_serial (cert);
	if (sn)
	{
	size_t n, len;
	n = gcry_sexp_canon_len (sn, 0, NULL, NULL);
	if (n < 2)
	{
	xfree (sn);
	return gpg_error (GPG_ERR_GENERAL);
	}
	blob->serialbuf = sn;
	sn++; n--; /* skip '(' */
	for (len=0; n && sn && sn != ':' && digitp (sn); n--, sn++)
	len = len*10 + atoi_1 (sn);
	if (*sn != ':')
	{
	xfree (blob->serialbuf);
	blob->serialbuf = NULL;
	return gpg_error (GPG_ERR_GENERAL);
	}
	sn++;
	blob->serial = sn;
	blob->seriallen = len;
	}

	blob->nkeys = 1;

	/* create list of names */
	blob->nuids = 0;
	max_names = 100;
	names = xtrymalloc (max_names * sizeof *names);
	if (!names)
	{
	rc = gpg_error_from_syserror ();
	goto leave;
	}

	p = ksba_cert_get_issuer (cert, 0);
	if (!p)
	{
	rc = gpg_error (GPG_ERR_MISSING_VALUE);
	goto leave;
	}
	names[blob->nuids++] = p;
	for (i=0; (p = ksba_cert_get_subject (cert, i)); i++)
	{
	if (blob->nuids >= max_names)
	{
	char **tmp;

	max_names += 100;
	tmp = xtryrealloc (names, max_names * sizeof *names);
	if (!tmp)
	{
	rc = gpg_error_from_syserror ();
	goto leave;
	}
	names = tmp;
	}
	names[blob->nuids++] = p;
	if (!i && (p=x509_email_kludge (p)))
	names[blob->nuids++] = p; /* due to !i we don't need to check bounds*/
	}

	/* space for signature information */
	blob->nsigs = 1;

	blob->keys = xtrycalloc (blob->nkeys, sizeof *blob->keys );
	blob->uids = xtrycalloc (blob->nuids, sizeof *blob->uids );
	blob->sigs = xtrycalloc (blob->nsigs, sizeof *blob->sigs );
	if (!blob->keys \|\| !blob->uids \|\| !blob->sigs)
	{
	rc = gpg_error (GPG_ERR_ENOMEM);
	goto leave;
	}

	memcpy (blob->keys[0].fpr, sha1_digest, 20);
	blob->keys[0].off_kid = 0; /* We don't have keyids */
	blob->keys[0].flags = 0;

	/* issuer and subject names */
	for (i=0; i < blob->nuids; i++)
	{
	blob->uids[i].name = names[i];
	blob->uids[i].len = strlen(names[i]);
	names[i] = NULL;
	blob->uids[i].flags = 0;
	blob->uids[i].validity = 0;
	}
	xfree (names);
	names = NULL;

	/* signatures */
	blob->sigs[0] = 0; /* not yet checked */

	/* Create a temporary buffer for further processing */
	init_membuf (&blob->bufbuf, 1024);
	blob->buf = &blob->bufbuf;
	/* write out what we already have */
	rc = create_blob_header (blob, BLOBTYPE_X509, as_ephemeral);
	if (rc)
	goto leave;
	rc = x509_create_blob_cert (blob, cert);
	if (rc)
	goto leave;
	rc = create_blob_trailer (blob);
	if (rc)
	goto leave;
	rc = create_blob_finish ( blob );
	if (rc)
	goto leave;


	leave:
	release_kid_list (blob->temp_kids);
	blob->temp_kids = NULL;
	if (names)
	{
	for (i=0; i < blob->nuids; i++)
	xfree (names[i]);
	xfree (names);
	}
	if (rc)
	{
	_keybox_release_blob (blob);
	*r_blob = NULL;
	}
	else
	{
	*r_blob = blob;
	}
	return rc;
	}
	#endif /KEYBOX_WITH_X509/



	int
	_keybox_new_blob (KEYBOXBLOB *r_blob,
	unsigned char *image, size_t imagelen, off_t off)
	{
	KEYBOXBLOB blob;

	*r_blob = NULL;
	blob = xtrycalloc (1, sizeof *blob);
	if (!blob)
	return gpg_error_from_syserror ();

	blob->blob = image;
	blob->bloblen = imagelen;
	blob->fileoffset = off;
	*r_blob = blob;
	return 0;
	}


	void
	_keybox_release_blob (KEYBOXBLOB blob)
	{
	int i;
	if (!blob)
	return;
	/* hmmm: release membuf here?*/
	xfree (blob->keys );
	xfree (blob->serialbuf);
	for (i=0; i < blob->nuids; i++)
	xfree (blob->uids[i].name);
	xfree (blob->uids );
	xfree (blob->sigs );
	xfree (blob->blob );
	xfree (blob );
	}



	const unsigned char *
	_keybox_get_blob_image ( KEYBOXBLOB blob, size_t *n )
	{
	*n = blob->bloblen;
	return blob->blob;
	}

	off_t
	_keybox_get_blob_fileoffset (KEYBOXBLOB blob)
	{
	return blob->fileoffset;
	}



	void
	_keybox_update_header_blob (KEYBOXBLOB blob)
	{
	if (blob->bloblen >= 32 && blob->blob[4] == BLOBTYPE_HEADER)
	{
	u32 val = make_timestamp ();

	/* Update the last maintenance run times tamp. */
	blob->blob[20] = (val >> 24);
	blob->blob[20+1] = (val >> 16);
	blob->blob[20+2] = (val >> 8);
	blob->blob[20+3] = (val );
	}
	}

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