protect-tool.c
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protect-tool.c
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	/* protect-tool.c - A tool to test the secret key protection
	* Copyright (C) 2002, 2003, 2004, 2006 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/>.
	*/

	#include <config.h>

	#include <stdio.h>
	#include <stdlib.h>
	#include <stddef.h>
	#include <stdarg.h>
	#include <string.h>
	#include <errno.h>
	#include <assert.h>
	#include <sys/stat.h>
	#include <unistd.h>
	#ifdef HAVE_LOCALE_H
	#include <locale.h>
	#endif
	#ifdef HAVE_LANGINFO_CODESET
	#include <langinfo.h>
	#endif
	#ifdef HAVE_DOSISH_SYSTEM
	#include <fcntl.h> /* for setmode() */
	#endif

	#define JNLIB_NEED_LOG_LOGV
	#include "agent.h"
	#include "minip12.h"
	#include "i18n.h"
	#include "get-passphrase.h"
	#include "sysutils.h"
	#include "estream.h"


	enum cmd_and_opt_values
	{
	aNull = 0,
	oVerbose = 'v',
	oArmor = 'a',
	oPassphrase = 'P',

	oProtect = 'p',
	oUnprotect = 'u',

	oNoVerbose = 500,
	oShadow,
	oShowShadowInfo,
	oShowKeygrip,
	oCanonical,

	oP12Import,
	oP12Export,
	oP12Charset,
	oStore,
	oForce,
	oHaveCert,
	oNoFailOnExist,
	oHomedir,
	oPrompt,
	oStatusMsg,

	oAgentProgram
	};


	struct rsa_secret_key_s
	{
	gcry_mpi_t n; /* public modulus */
	gcry_mpi_t e; /* public exponent */
	gcry_mpi_t d; /* exponent */
	gcry_mpi_t p; /* prime p. */
	gcry_mpi_t q; /* prime q. */
	gcry_mpi_t u; /* inverse of p mod q. */
	};


	static const char *opt_homedir;
	static int opt_armor;
	static int opt_canonical;
	static int opt_store;
	static int opt_force;
	static int opt_no_fail_on_exist;
	static int opt_have_cert;
	static const char *opt_passphrase;
	static char *opt_prompt;
	static int opt_status_msg;
	static const char *opt_p12_charset;
	static const char *opt_agent_program;

	static char *get_passphrase (int promptno);
	static void release_passphrase (char *pw);
	static int store_private_key (const unsigned char *grip,
	const void *buffer, size_t length, int force);


	static ARGPARSE_OPTS opts[] = {
	ARGPARSE_group (300, N_("@Commands:\n ")),

	ARGPARSE_c (oProtect, "protect", "protect a private key"),
	ARGPARSE_c (oUnprotect, "unprotect", "unprotect a private key"),
	ARGPARSE_c (oShadow, "shadow", "create a shadow entry for a public key"),
	ARGPARSE_c (oShowShadowInfo, "show-shadow-info", "return the shadow info"),
	ARGPARSE_c (oShowKeygrip, "show-keygrip", "show the \"keygrip\""),
	ARGPARSE_c (oP12Import, "p12-import",
	"import a pkcs#12 encoded private key"),
	ARGPARSE_c (oP12Export, "p12-export",
	"export a private key pkcs#12 encoded"),

	ARGPARSE_group (301, N_("@\nOptions:\n ")),

	ARGPARSE_s_n (oVerbose, "verbose", "verbose"),
	ARGPARSE_s_n (oArmor, "armor", "write output in advanced format"),
	ARGPARSE_s_n (oCanonical, "canonical", "write output in canonical format"),

	ARGPARSE_s_s (oPassphrase, "passphrase", "\|STRING\|use passphrase STRING"),
	ARGPARSE_s_s (oP12Charset,"p12-charset",
	"\|NAME\|set charset for a new PKCS#12 passphrase to NAME"),
	ARGPARSE_s_n (oHaveCert, "have-cert",
	"certificate to export provided on STDIN"),
	ARGPARSE_s_n (oStore, "store",
	"store the created key in the appropriate place"),
	ARGPARSE_s_n (oForce, "force",
	"force overwriting"),
	ARGPARSE_s_n (oNoFailOnExist, "no-fail-on-exist", "@"),
	ARGPARSE_s_s (oHomedir, "homedir", "@"),
	ARGPARSE_s_s (oPrompt, "prompt",
	"\|ESCSTRING\|use ESCSTRING as prompt in pinentry"),
	ARGPARSE_s_n (oStatusMsg, "enable-status-msg", "@"),

	ARGPARSE_s_s (oAgentProgram, "agent-program", "@"),

	ARGPARSE_end ()
	};

	static const char *
	my_strusage (int level)
	{
	const char *p;
	switch (level)
	{
	case 11: p = "gpg-protect-tool (GnuPG)";
	break;
	case 13: p = VERSION; break;
	case 17: p = PRINTABLE_OS_NAME; break;
	case 19: p = _("Please report bugs to <" PACKAGE_BUGREPORT ">.\n");
	break;
	case 1:
	case 40: p = _("Usage: gpg-protect-tool [options] (-h for help)\n");
	break;
	case 41: p = _("Syntax: gpg-protect-tool [options] [args]\n"
	"Secret key maintenance tool\n");
	break;

	default: p = NULL;
	}
	return p;
	}


	/* static void */
	/* print_mpi (const char text, gcry_mpi_t a) /
	/* { */
	/* char buf; /
	/* void bufaddr = &buf; /
	/* int rc; */

	/* rc = gcry_mpi_aprint (GCRYMPI_FMT_HEX, bufaddr, NULL, a); */
	/* if (rc) */
	/* log_info ("%s: [error printing number: %s]\n", text, gpg_strerror (rc)); */
	/* else */
	/* { */
	/* log_info ("%s: %s\n", text, buf); */
	/* gcry_free (buf); */
	/* } */
	/* } */



	static unsigned char *
	make_canonical (const char fname, const char buf, size_t buflen)
	{
	int rc;
	size_t erroff, len;
	gcry_sexp_t sexp;
	unsigned char *result;

	rc = gcry_sexp_sscan (&sexp, &erroff, buf, buflen);
	if (rc)
	{
	log_error ("invalid S-Expression in `%s' (off=%u): %s\n",
	fname, (unsigned int)erroff, gpg_strerror (rc));
	return NULL;
	}
	len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_CANON, NULL, 0);
	assert (len);
	result = xmalloc (len);
	len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_CANON, result, len);
	assert (len);
	gcry_sexp_release (sexp);
	return result;
	}

	static char *
	make_advanced (const unsigned char *buf, size_t buflen)
	{
	int rc;
	size_t erroff, len;
	gcry_sexp_t sexp;
	char *result;

	rc = gcry_sexp_sscan (&sexp, &erroff, (const char*)buf, buflen);
	if (rc)
	{
	log_error ("invalid canonical S-Expression (off=%u): %s\n",
	(unsigned int)erroff, gpg_strerror (rc));
	return NULL;
	}
	len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, NULL, 0);
	assert (len);
	result = xmalloc (len);
	len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, result, len);
	assert (len);
	gcry_sexp_release (sexp);
	return result;
	}


	static char *
	read_file (const char fname, size_t r_length)
	{
	FILE *fp;
	char *buf;
	size_t buflen;

	if (!strcmp (fname, "-"))
	{
	size_t nread, bufsize = 0;

	fp = stdin;
	#ifdef HAVE_DOSISH_SYSTEM
	setmode ( fileno(fp) , O_BINARY );
	#endif
	buf = NULL;
	buflen = 0;
	#define NCHUNK 8192
	do
	{
	bufsize += NCHUNK;
	if (!buf)
	buf = xmalloc (bufsize);
	else
	buf = xrealloc (buf, bufsize);

	nread = fread (buf+buflen, 1, NCHUNK, fp);
	if (nread < NCHUNK && ferror (fp))
	{
	log_error ("error reading `[stdin]': %s\n", strerror (errno));
	xfree (buf);
	return NULL;
	}
	buflen += nread;
	}
	while (nread == NCHUNK);
	#undef NCHUNK

	}
	else
	{
	struct stat st;

	fp = fopen (fname, "rb");
	if (!fp)
	{
	log_error ("can't open `%s': %s\n", fname, strerror (errno));
	return NULL;
	}

	if (fstat (fileno(fp), &st))
	{
	log_error ("can't stat `%s': %s\n", fname, strerror (errno));
	fclose (fp);
	return NULL;
	}

	buflen = st.st_size;
	buf = xmalloc (buflen+1);
	if (fread (buf, buflen, 1, fp) != 1)
	{
	log_error ("error reading `%s': %s\n", fname, strerror (errno));
	fclose (fp);
	xfree (buf);
	return NULL;
	}
	fclose (fp);
	}

	*r_length = buflen;
	return buf;
	}


	static unsigned char *
	read_key (const char *fname)
	{
	char *buf;
	size_t buflen;
	unsigned char *key;

	buf = read_file (fname, &buflen);
	if (!buf)
	return NULL;
	key = make_canonical (fname, buf, buflen);
	xfree (buf);
	return key;
	}



	static void
	read_and_protect (const char *fname)
	{
	int rc;
	unsigned char *key;
	unsigned char *result;
	size_t resultlen;
	char *pw;

	key = read_key (fname);
	if (!key)
	return;

	pw = get_passphrase (1);
	rc = agent_protect (key, pw, &result, &resultlen);
	release_passphrase (pw);
	xfree (key);
	if (rc)
	{
	log_error ("protecting the key failed: %s\n", gpg_strerror (rc));
	return;
	}

	if (opt_armor)
	{
	char *p = make_advanced (result, resultlen);
	xfree (result);
	if (!p)
	return;
	result = (unsigned char*)p;
	resultlen = strlen (p);
	}

	fwrite (result, resultlen, 1, stdout);
	xfree (result);
	}


	static void
	read_and_unprotect (const char *fname)
	{
	int rc;
	unsigned char *key;
	unsigned char *result;
	size_t resultlen;
	char *pw;
	gnupg_isotime_t protected_at;

	key = read_key (fname);
	if (!key)
	return;

	rc = agent_unprotect (key, (pw=get_passphrase (1)),
	protected_at, &result, &resultlen);
	release_passphrase (pw);
	xfree (key);
	if (rc)
	{
	if (opt_status_msg)
	log_info ("[PROTECT-TOOL:] bad-passphrase\n");
	log_error ("unprotecting the key failed: %s\n", gpg_strerror (rc));
	return;
	}
	if (opt.verbose)
	log_info ("key protection done at %.4s-%.2s-%.2s %.2s:%.2s:%s\n",
	protected_at, protected_at+4, protected_at+6,
	protected_at+9, protected_at+11, protected_at+13);


	if (opt_armor)
	{
	char *p = make_advanced (result, resultlen);
	xfree (result);
	if (!p)
	return;
	result = (unsigned char*)p;
	resultlen = strlen (p);
	}

	fwrite (result, resultlen, 1, stdout);
	xfree (result);
	}



	static void
	read_and_shadow (const char *fname)
	{
	int rc;
	unsigned char *key;
	unsigned char *result;
	size_t resultlen;
	unsigned char dummy_info[] = "(8:313233342:43)";

	key = read_key (fname);
	if (!key)
	return;

	rc = agent_shadow_key (key, dummy_info, &result);
	xfree (key);
	if (rc)
	{
	log_error ("shadowing the key failed: %s\n", gpg_strerror (rc));
	return;
	}
	resultlen = gcry_sexp_canon_len (result, 0, NULL,NULL);
	assert (resultlen);

	if (opt_armor)
	{
	char *p = make_advanced (result, resultlen);
	xfree (result);
	if (!p)
	return;
	result = (unsigned char*)p;
	resultlen = strlen (p);
	}

	fwrite (result, resultlen, 1, stdout);
	xfree (result);
	}

	static void
	show_shadow_info (const char *fname)
	{
	int rc;
	unsigned char *key;
	const unsigned char *info;
	size_t infolen;

	key = read_key (fname);
	if (!key)
	return;

	rc = agent_get_shadow_info (key, &info);
	xfree (key);
	if (rc)
	{
	log_error ("get_shadow_info failed: %s\n", gpg_strerror (rc));
	return;
	}
	infolen = gcry_sexp_canon_len (info, 0, NULL,NULL);
	assert (infolen);

	if (opt_armor)
	{
	char *p = make_advanced (info, infolen);
	if (!p)
	return;
	fwrite (p, strlen (p), 1, stdout);
	xfree (p);
	}
	else
	fwrite (info, infolen, 1, stdout);
	}


	static void
	show_file (const char *fname)
	{
	unsigned char *key;
	size_t keylen;
	char *p;

	key = read_key (fname);
	if (!key)
	return;

	keylen = gcry_sexp_canon_len (key, 0, NULL,NULL);
	assert (keylen);

	if (opt_canonical)
	{
	fwrite (key, keylen, 1, stdout);
	}
	else
	{
	p = make_advanced (key, keylen);
	if (p)
	{
	fwrite (p, strlen (p), 1, stdout);
	xfree (p);
	}
	}
	xfree (key);
	}

	static void
	show_keygrip (const char *fname)
	{
	unsigned char *key;
	gcry_sexp_t private;
	unsigned char grip[20];
	int i;

	key = read_key (fname);
	if (!key)
	return;

	if (gcry_sexp_new (&private, key, 0, 0))
	{
	log_error ("gcry_sexp_new failed\n");
	return;
	}
	xfree (key);

	if (!gcry_pk_get_keygrip (private, grip))
	{
	log_error ("can't calculate keygrip\n");
	return;
	}
	gcry_sexp_release (private);

	for (i=0; i < 20; i++)
	printf ("%02X", grip[i]);
	putchar ('\n');
	}


	static int
	rsa_key_check (struct rsa_secret_key_s *skey)
	{
	int err = 0;
	gcry_mpi_t t = gcry_mpi_snew (0);
	gcry_mpi_t t1 = gcry_mpi_snew (0);
	gcry_mpi_t t2 = gcry_mpi_snew (0);
	gcry_mpi_t phi = gcry_mpi_snew (0);

	/* check that n == p * q */
	gcry_mpi_mul (t, skey->p, skey->q);
	if (gcry_mpi_cmp( t, skey->n) )
	{
	log_error ("RSA oops: n != p * q\n");
	err++;
	}

	/* check that p is less than q */
	if (gcry_mpi_cmp (skey->p, skey->q) > 0)
	{
	gcry_mpi_t tmp;

	log_info ("swapping secret primes\n");
	tmp = gcry_mpi_copy (skey->p);
	gcry_mpi_set (skey->p, skey->q);
	gcry_mpi_set (skey->q, tmp);
	gcry_mpi_release (tmp);
	/* and must recompute u of course */
	gcry_mpi_invm (skey->u, skey->p, skey->q);
	}

	/* check that e divides neither p-1 nor q-1 */
	gcry_mpi_sub_ui (t, skey->p, 1 );
	gcry_mpi_div (NULL, t, t, skey->e, 0);
	if (!gcry_mpi_cmp_ui( t, 0) )
	{
	log_error ("RSA oops: e divides p-1\n");
	err++;
	}
	gcry_mpi_sub_ui (t, skey->q, 1);
	gcry_mpi_div (NULL, t, t, skey->e, 0);
	if (!gcry_mpi_cmp_ui( t, 0))
	{
	log_info ( "RSA oops: e divides q-1\n" );
	err++;
	}

	/* check that d is correct. */
	gcry_mpi_sub_ui (t1, skey->p, 1);
	gcry_mpi_sub_ui (t2, skey->q, 1);
	gcry_mpi_mul (phi, t1, t2);
	gcry_mpi_invm (t, skey->e, phi);
	if (gcry_mpi_cmp (t, skey->d))
	{ /* no: try universal exponent. */
	gcry_mpi_gcd (t, t1, t2);
	gcry_mpi_div (t, NULL, phi, t, 0);
	gcry_mpi_invm (t, skey->e, t);
	if (gcry_mpi_cmp (t, skey->d))
	{
	log_error ("RSA oops: bad secret exponent\n");
	err++;
	}
	}

	/* check for correctness of u */
	gcry_mpi_invm (t, skey->p, skey->q);
	if (gcry_mpi_cmp (t, skey->u))
	{
	log_info ( "RSA oops: bad u parameter\n");
	err++;
	}

	if (err)
	log_info ("RSA secret key check failed\n");

	gcry_mpi_release (t);
	gcry_mpi_release (t1);
	gcry_mpi_release (t2);
	gcry_mpi_release (phi);

	return err? -1:0;
	}


	/* A callback used by p12_parse to return a certificate. */
	static void
	import_p12_cert_cb (void opaque, const unsigned char cert, size_t certlen)
	{
	struct b64state state;
	gpg_error_t err, err2;

	(void)opaque;

	err = b64enc_start (&state, stdout, "CERTIFICATE");
	if (!err)
	err = b64enc_write (&state, cert, certlen);
	err2 = b64enc_finish (&state);
	if (!err)
	err = err2;
	if (err)
	log_error ("error writing armored certificate: %s\n", gpg_strerror (err));
	}

	static void
	import_p12_file (const char *fname)
	{
	char *buf;
	unsigned char *result;
	size_t buflen, resultlen, buf_off;
	int i;
	int rc;
	gcry_mpi_t *kparms;
	struct rsa_secret_key_s sk;
	gcry_sexp_t s_key;
	unsigned char *key;
	unsigned char grip[20];
	char *pw;

	/* fixme: we should release some stuff on error */

	buf = read_file (fname, &buflen);
	if (!buf)
	return;

	/* GnuPG 2.0.4 accidently created binary P12 files with the string
	"The passphrase is %s encoded.\n\n" prepended to the ASN.1 data.
	We fix that here. */
	if (buflen > 29 && !memcmp (buf, "The passphrase is ", 18))
	{
	for (buf_off=18; buf_off < buflen && buf[buf_off] != '\n'; buf_off++)
	;
	buf_off++;
	if (buf_off < buflen && buf[buf_off] == '\n')
	buf_off++;
	}
	else
	buf_off = 0;

	kparms = p12_parse ((unsigned char*)buf+buf_off, buflen-buf_off,
	(pw=get_passphrase (2)),
	import_p12_cert_cb, NULL);
	release_passphrase (pw);
	xfree (buf);
	if (!kparms)
	{
	log_error ("error parsing or decrypting the PKCS-12 file\n");
	return;
	}
	for (i=0; kparms[i]; i++)
	;
	if (i != 8)
	{
	log_error ("invalid structure of private key\n");
	return;
	}


	/* print_mpi (" n", kparms[0]); */
	/* print_mpi (" e", kparms[1]); */
	/* print_mpi (" d", kparms[2]); */
	/* print_mpi (" p", kparms[3]); */
	/* print_mpi (" q", kparms[4]); */
	/* print_mpi ("dmp1", kparms[5]); */
	/* print_mpi ("dmq1", kparms[6]); */
	/* print_mpi (" u", kparms[7]); */

	sk.n = kparms[0];
	sk.e = kparms[1];
	sk.d = kparms[2];
	sk.q = kparms[3];
	sk.p = kparms[4];
	sk.u = kparms[7];
	if (rsa_key_check (&sk))
	return;
	/* print_mpi (" n", sk.n); */
	/* print_mpi (" e", sk.e); */
	/* print_mpi (" d", sk.d); */
	/* print_mpi (" p", sk.p); */
	/* print_mpi (" q", sk.q); */
	/* print_mpi (" u", sk.u); */

	/* Create an S-expresion from the parameters. */
	rc = gcry_sexp_build (&s_key, NULL,
	"(private-key(rsa(n%m)(e%m)(d%m)(p%m)(q%m)(u%m)))",
	sk.n, sk.e, sk.d, sk.p, sk.q, sk.u, NULL);
	for (i=0; i < 8; i++)
	gcry_mpi_release (kparms[i]);
	gcry_free (kparms);
	if (rc)
	{
	log_error ("failed to created S-expression from key: %s\n",
	gpg_strerror (rc));
	return;
	}

	/* Compute the keygrip. */
	if (!gcry_pk_get_keygrip (s_key, grip))
	{
	log_error ("can't calculate keygrip\n");
	return;
	}
	log_info ("keygrip: ");
	for (i=0; i < 20; i++)
	log_printf ("%02X", grip[i]);
	log_printf ("\n");

	/* Convert to canonical encoding. */
	buflen = gcry_sexp_sprint (s_key, GCRYSEXP_FMT_CANON, NULL, 0);
	assert (buflen);
	key = gcry_xmalloc_secure (buflen);
	buflen = gcry_sexp_sprint (s_key, GCRYSEXP_FMT_CANON, key, buflen);
	assert (buflen);
	gcry_sexp_release (s_key);

	pw = get_passphrase (4);
	rc = agent_protect (key, pw, &result, &resultlen);
	release_passphrase (pw);
	xfree (key);
	if (rc)
	{
	log_error ("protecting the key failed: %s\n", gpg_strerror (rc));
	return;
	}

	if (opt_armor)
	{
	char *p = make_advanced (result, resultlen);
	xfree (result);
	if (!p)
	return;
	result = (unsigned char*)p;
	resultlen = strlen (p);
	}

	if (opt_store)
	store_private_key (grip, result, resultlen, opt_force);
	else
	fwrite (result, resultlen, 1, stdout);

	xfree (result);
	}



	static gcry_mpi_t *
	sexp_to_kparms (gcry_sexp_t sexp)
	{
	gcry_sexp_t list, l2;
	const char *name;
	const char *s;
	size_t n;
	int i, idx;
	const char *elems;
	gcry_mpi_t *array;

	list = gcry_sexp_find_token (sexp, "private-key", 0 );
	if(!list)
	return NULL;
	l2 = gcry_sexp_cadr (list);
	gcry_sexp_release (list);
	list = l2;
	name = gcry_sexp_nth_data (list, 0, &n);
	if(!name \|\| n != 3 \|\| memcmp (name, "rsa", 3))
	{
	gcry_sexp_release (list);
	return NULL;
	}

	/* Parameter names used with RSA. */
	elems = "nedpqu";
	array = xcalloc (strlen(elems) + 1, sizeof *array);
	for (idx=0, s=elems; *s; s++, idx++ )
	{
	l2 = gcry_sexp_find_token (list, s, 1);
	if (!l2)
	{
	for (i=0; i<idx; i++)
	gcry_mpi_release (array[i]);
	xfree (array);
	gcry_sexp_release (list);
	return NULL; /* required parameter not found */
	}
	array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
	gcry_sexp_release (l2);
	if (!array[idx])
	{
	for (i=0; i<idx; i++)
	gcry_mpi_release (array[i]);
	xfree (array);
	gcry_sexp_release (list);
	return NULL; /* required parameter is invalid */
	}
	}

	gcry_sexp_release (list);
	return array;
	}


	/* Check whether STRING is a KEYGRIP, i.e has the correct length and
	does only consist of uppercase hex characters. */
	static int
	is_keygrip (const char *string)
	{
	int i;

	for(i=0; string[i] && i < 41; i++)
	if (!strchr("01234567890ABCDEF", string[i]))
	return 0;
	return i == 40;
	}


	static void
	export_p12_file (const char *fname)
	{
	int rc;
	gcry_mpi_t kparms[9], *kp;
	unsigned char *key;
	size_t keylen;
	gcry_sexp_t private;
	struct rsa_secret_key_s sk;
	int i;
	unsigned char *cert = NULL;
	size_t certlen = 0;
	int keytype;
	size_t keylen_for_wipe = 0;
	char *pw;

	if ( is_keygrip (fname) )
	{
	char hexgrip[40+4+1];
	char *p;

	assert (strlen(fname) == 40);
	strcpy (stpcpy (hexgrip, fname), ".key");

	p = make_filename (opt_homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
	key = read_key (p);
	xfree (p);
	}
	else
	key = read_key (fname);

	if (!key)
	return;

	keytype = agent_private_key_type (key);
	if (keytype == PRIVATE_KEY_PROTECTED)
	{
	unsigned char *tmpkey;
	size_t tmplen;

	rc = agent_unprotect (key, (pw=get_passphrase (1)),
	NULL, &tmpkey, &tmplen);
	release_passphrase (pw);
	if (rc)
	{
	if (opt_status_msg && gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE )
	log_info ("[PROTECT-TOOL:] bad-passphrase\n");
	log_error ("unprotecting key `%s' failed: %s\n",
	fname, gpg_strerror (rc));
	xfree (key);
	return;
	}
	xfree (key);
	key = tmpkey;
	keylen_for_wipe = tmplen;

	keytype = agent_private_key_type (key);
	}

	if (keytype == PRIVATE_KEY_SHADOWED)
	{
	log_error ("`%s' is a shadowed private key - can't export it\n", fname);
	wipememory (key, keylen_for_wipe);
	xfree (key);
	return;
	}
	else if (keytype != PRIVATE_KEY_CLEAR)
	{
	log_error ("\%s' is not a private key\n", fname);
	wipememory (key, keylen_for_wipe);
	xfree (key);
	return;
	}


	if (opt_have_cert)
	{
	cert = (unsigned char*)read_file ("-", &certlen);
	if (!cert)
	{
	wipememory (key, keylen_for_wipe);
	xfree (key);
	return;
	}
	}


	if (gcry_sexp_new (&private, key, 0, 0))
	{
	log_error ("gcry_sexp_new failed\n");
	wipememory (key, keylen_for_wipe);
	xfree (key);
	xfree (cert);
	return;
	}
	wipememory (key, keylen_for_wipe);
	xfree (key);

	kp = sexp_to_kparms (private);
	gcry_sexp_release (private);
	if (!kp)
	{
	log_error ("error converting key parameters\n");
	xfree (cert);
	return;
	}
	sk.n = kp[0];
	sk.e = kp[1];
	sk.d = kp[2];
	sk.p = kp[3];
	sk.q = kp[4];
	sk.u = kp[5];
	xfree (kp);


	kparms[0] = sk.n;
	kparms[1] = sk.e;
	kparms[2] = sk.d;
	kparms[3] = sk.q;
	kparms[4] = sk.p;
	kparms[5] = gcry_mpi_snew (0); /* compute d mod (p-1) */
	gcry_mpi_sub_ui (kparms[5], kparms[3], 1);
	gcry_mpi_mod (kparms[5], sk.d, kparms[5]);
	kparms[6] = gcry_mpi_snew (0); /* compute d mod (q-1) */
	gcry_mpi_sub_ui (kparms[6], kparms[4], 1);
	gcry_mpi_mod (kparms[6], sk.d, kparms[6]);
	kparms[7] = sk.u;
	kparms[8] = NULL;

	pw = get_passphrase (3);
	key = p12_build (kparms, cert, certlen, pw, opt_p12_charset, &keylen);
	release_passphrase (pw);
	xfree (cert);
	for (i=0; i < 8; i++)
	gcry_mpi_release (kparms[i]);
	if (!key)
	return;

	#ifdef HAVE_DOSISH_SYSTEM
	setmode ( fileno (stdout) , O_BINARY );
	#endif
	fwrite (key, keylen, 1, stdout);
	xfree (key);
	}



	int
	main (int argc, char **argv )
	{
	ARGPARSE_ARGS pargs;
	int cmd = 0;
	const char *fname;

	set_strusage (my_strusage);
	gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
	log_set_prefix ("gpg-protect-tool", 1);

	/* Make sure that our subsystems are ready. */
	i18n_init ();
	init_common_subsystems ();

	if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
	{
	log_fatal( _("%s is too old (need %s, have %s)\n"), "libgcrypt",
	NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
	}

	setup_libgcrypt_logging ();
	gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);


	opt_homedir = default_homedir ();


	pargs.argc = &argc;
	pargs.argv = &argv;
	pargs.flags= 1; /* (do not remove the args) */
	while (arg_parse (&pargs, opts) )
	{
	switch (pargs.r_opt)
	{
	case oVerbose: opt.verbose++; break;
	case oArmor: opt_armor=1; break;
	case oCanonical: opt_canonical=1; break;
	case oHomedir: opt_homedir = pargs.r.ret_str; break;

	case oAgentProgram: opt_agent_program = pargs.r.ret_str; break;

	case oProtect: cmd = oProtect; break;
	case oUnprotect: cmd = oUnprotect; break;
	case oShadow: cmd = oShadow; break;
	case oShowShadowInfo: cmd = oShowShadowInfo; break;
	case oShowKeygrip: cmd = oShowKeygrip; break;
	case oP12Import: cmd = oP12Import; break;
	case oP12Export: cmd = oP12Export; break;
	case oP12Charset: opt_p12_charset = pargs.r.ret_str; break;

	case oPassphrase: opt_passphrase = pargs.r.ret_str; break;
	case oStore: opt_store = 1; break;
	case oForce: opt_force = 1; break;
	case oNoFailOnExist: opt_no_fail_on_exist = 1; break;
	case oHaveCert: opt_have_cert = 1; break;
	case oPrompt: opt_prompt = pargs.r.ret_str; break;
	case oStatusMsg: opt_status_msg = 1; break;

	default: pargs.err = ARGPARSE_PRINT_ERROR; break;
	}
	}
	if (log_get_errorcount (0))
	exit (2);

	fname = "-";
	if (argc == 1)
	fname = *argv;
	else if (argc > 1)
	usage (1);

	/* Set the information which can't be taken from envvars. */
	gnupg_prepare_get_passphrase (GPG_ERR_SOURCE_DEFAULT,
	opt.verbose,
	opt_homedir,
	opt_agent_program,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL);

	if (opt_prompt)
	opt_prompt = percent_plus_unescape (opt_prompt, 0);

	if (cmd == oProtect)
	read_and_protect (fname);
	else if (cmd == oUnprotect)
	read_and_unprotect (fname);
	else if (cmd == oShadow)
	read_and_shadow (fname);
	else if (cmd == oShowShadowInfo)
	show_shadow_info (fname);
	else if (cmd == oShowKeygrip)
	show_keygrip (fname);
	else if (cmd == oP12Import)
	import_p12_file (fname);
	else if (cmd == oP12Export)
	export_p12_file (fname);
	else
	show_file (fname);

	agent_exit (0);
	return 8; /NOTREACHED/
	}

	void
	agent_exit (int rc)
	{
	rc = rc? rc : log_get_errorcount(0)? 2 : 0;
	exit (rc);
	}


	/* Return the passphrase string and ask the agent if it has not been
	set from the command line PROMPTNO select the prompt to display:
	0 = default
	1 = taken from the option --prompt
	2 = for unprotecting a pkcs#12 object
	3 = for protecting a new pkcs#12 object
	4 = for protecting an imported pkcs#12 in our system
	*/
	static char *
	get_passphrase (int promptno)
	{
	char *pw;
	int err;
	const char *desc;
	char *orig_codeset;
	int repeat = 0;

	if (opt_passphrase)
	return xstrdup (opt_passphrase);

	orig_codeset = i18n_switchto_utf8 ();

	if (promptno == 1 && opt_prompt)
	{
	desc = opt_prompt;
	}
	else if (promptno == 2)
	{
	desc = _("Please enter the passphrase to unprotect the "
	"PKCS#12 object.");
	}
	else if (promptno == 3)
	{
	desc = _("Please enter the passphrase to protect the "
	"new PKCS#12 object.");
	repeat = 1;
	}
	else if (promptno == 4)
	{
	desc = _("Please enter the passphrase to protect the "
	"imported object within the GnuPG system.");
	repeat = 1;
	}
	else
	desc = _("Please enter the passphrase or the PIN\n"
	"needed to complete this operation.");

	i18n_switchback (orig_codeset);

	err = gnupg_get_passphrase (NULL, NULL, _("Passphrase:"), desc,
	repeat, repeat, 1, &pw);
	if (err)
	{
	if (gpg_err_code (err) == GPG_ERR_CANCELED)
	log_info (_("cancelled\n"));
	else
	log_error (_("error while asking for the passphrase: %s\n"),
	gpg_strerror (err));
	agent_exit (0);
	}
	assert (pw);

	return pw;
	}


	static void
	release_passphrase (char *pw)
	{
	if (pw)
	{
	wipememory (pw, strlen (pw));
	xfree (pw);
	}
	}

	static int
	store_private_key (const unsigned char *grip,
	const void *buffer, size_t length, int force)
	{
	char *fname;
	estream_t fp;
	char hexgrip[40+4+1];

	bin2hex (grip, 20, hexgrip);

	fname = make_filename (opt_homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
	if (force)
	fp = es_fopen (fname, "wb");
	else
	{
	if (!access (fname, F_OK))
	{
	if (opt_status_msg)
	log_info ("[PROTECT-TOOL:] secretkey-exists\n");
	if (opt_no_fail_on_exist)
	log_info ("secret key file `%s' already exists\n", fname);
	else
	log_error ("secret key file `%s' already exists\n", fname);
	xfree (fname);
	return opt_no_fail_on_exist? 0 : -1;
	}
	/* FWIW: Under Windows Vista the standard fopen in the msvcrt
	fails if the "x" GNU extension is used. */
	fp = es_fopen (fname, "wbx");
	}

	if (!fp)
	{
	log_error ("can't create `%s': %s\n", fname, strerror (errno));
	xfree (fname);
	return -1;
	}

	if (es_fwrite (buffer, length, 1, fp) != 1)
	{
	log_error ("error writing `%s': %s\n", fname, strerror (errno));
	es_fclose (fp);
	remove (fname);
	xfree (fname);
	return -1;
	}
	if (es_fclose (fp))
	{
	log_error ("error closing `%s': %s\n", fname, strerror (errno));
	remove (fname);
	xfree (fname);
	return -1;
	}
	log_info ("secret key stored as `%s'\n", fname);

	if (opt_status_msg)
	log_info ("[PROTECT-TOOL:] secretkey-stored\n");

	xfree (fname);
	return 0;
	}

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