summaryrefslogtreecommitdiffstats
path: root/g10/misc.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--g10/misc.c1905
1 files changed, 1905 insertions, 0 deletions
diff --git a/g10/misc.c b/g10/misc.c
new file mode 100644
index 0000000..0b19e1a
--- /dev/null
+++ b/g10/misc.c
@@ -0,0 +1,1905 @@
+/* misc.c - miscellaneous functions
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ * 2008, 2009, 2010 Free Software Foundation, Inc.
+ * Copyright (C) 2014 Werner Koch
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
+#include <asm/sysinfo.h>
+#include <asm/unistd.h>
+#endif
+#ifdef HAVE_SETRLIMIT
+#include <time.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#endif
+#ifdef ENABLE_SELINUX_HACKS
+#include <sys/stat.h>
+#endif
+
+#ifdef HAVE_W32_SYSTEM
+#include <time.h>
+#include <process.h>
+#ifdef HAVE_WINSOCK2_H
+# define WIN32_LEAN_AND_MEAN 1
+# include <winsock2.h>
+#endif
+#include <windows.h>
+#include <shlobj.h>
+#ifndef CSIDL_APPDATA
+#define CSIDL_APPDATA 0x001a
+#endif
+#ifndef CSIDL_LOCAL_APPDATA
+#define CSIDL_LOCAL_APPDATA 0x001c
+#endif
+#ifndef CSIDL_FLAG_CREATE
+#define CSIDL_FLAG_CREATE 0x8000
+#endif
+#endif /*HAVE_W32_SYSTEM*/
+
+#include "gpg.h"
+#ifdef HAVE_W32_SYSTEM
+# include "../common/status.h"
+#endif /*HAVE_W32_SYSTEM*/
+#include "../common/util.h"
+#include "main.h"
+#include "photoid.h"
+#include "options.h"
+#include "call-agent.h"
+#include "../common/i18n.h"
+#include "../common/zb32.h"
+
+/* FIXME: Libgcrypt 1.9 will support EAX. Until we name this a
+ * requirement we hardwire the enum used for EAX. */
+#define MY_GCRY_CIPHER_MODE_EAX 14
+
+
+#ifdef ENABLE_SELINUX_HACKS
+/* A object and a global variable to keep track of files marked as
+ secured. */
+struct secured_file_item
+{
+ struct secured_file_item *next;
+ ino_t ino;
+ dev_t dev;
+};
+static struct secured_file_item *secured_files;
+#endif /*ENABLE_SELINUX_HACKS*/
+
+
+
+
+/* For the sake of SELinux we want to restrict access through gpg to
+ certain files we keep under our own control. This function
+ registers such a file and is_secured_file may then be used to
+ check whether a file has ben registered as secured. */
+void
+register_secured_file (const char *fname)
+{
+#ifdef ENABLE_SELINUX_HACKS
+ struct stat buf;
+ struct secured_file_item *sf;
+
+ /* Note that we stop immediately if something goes wrong here. */
+ if (gnupg_stat (fname, &buf))
+ log_fatal (_("fstat of '%s' failed in %s: %s\n"), fname,
+ "register_secured_file", strerror (errno));
+/* log_debug ("registering '%s' i=%lu.%lu\n", fname, */
+/* (unsigned long)buf.st_dev, (unsigned long)buf.st_ino); */
+ for (sf=secured_files; sf; sf = sf->next)
+ {
+ if (sf->ino == buf.st_ino && sf->dev == buf.st_dev)
+ return; /* Already registered. */
+ }
+
+ sf = xmalloc (sizeof *sf);
+ sf->ino = buf.st_ino;
+ sf->dev = buf.st_dev;
+ sf->next = secured_files;
+ secured_files = sf;
+#else /*!ENABLE_SELINUX_HACKS*/
+ (void)fname;
+#endif /*!ENABLE_SELINUX_HACKS*/
+}
+
+/* Remove a file registered as secure. */
+void
+unregister_secured_file (const char *fname)
+{
+#ifdef ENABLE_SELINUX_HACKS
+ struct stat buf;
+ struct secured_file_item *sf, *sfprev;
+
+ if (gnupg_stat (fname, &buf))
+ {
+ log_error (_("fstat of '%s' failed in %s: %s\n"), fname,
+ "unregister_secured_file", strerror (errno));
+ return;
+ }
+/* log_debug ("unregistering '%s' i=%lu.%lu\n", fname, */
+/* (unsigned long)buf.st_dev, (unsigned long)buf.st_ino); */
+ for (sfprev=NULL,sf=secured_files; sf; sfprev=sf, sf = sf->next)
+ {
+ if (sf->ino == buf.st_ino && sf->dev == buf.st_dev)
+ {
+ if (sfprev)
+ sfprev->next = sf->next;
+ else
+ secured_files = sf->next;
+ xfree (sf);
+ return;
+ }
+ }
+#else /*!ENABLE_SELINUX_HACKS*/
+ (void)fname;
+#endif /*!ENABLE_SELINUX_HACKS*/
+}
+
+/* Return true if FD is corresponds to a secured file. Using -1 for
+ FS is allowed and will return false. */
+int
+is_secured_file (int fd)
+{
+#ifdef ENABLE_SELINUX_HACKS
+ struct stat buf;
+ struct secured_file_item *sf;
+
+ if (fd == -1)
+ return 0; /* No file descriptor so it can't be secured either. */
+
+ /* Note that we print out a error here and claim that a file is
+ secure if something went wrong. */
+ if (fstat (fd, &buf))
+ {
+ log_error (_("fstat(%d) failed in %s: %s\n"), fd,
+ "is_secured_file", strerror (errno));
+ return 1;
+ }
+/* log_debug ("is_secured_file (%d) i=%lu.%lu\n", fd, */
+/* (unsigned long)buf.st_dev, (unsigned long)buf.st_ino); */
+ for (sf=secured_files; sf; sf = sf->next)
+ {
+ if (sf->ino == buf.st_ino && sf->dev == buf.st_dev)
+ return 1; /* Yes. */
+ }
+#else /*!ENABLE_SELINUX_HACKS*/
+ (void)fd;
+#endif /*!ENABLE_SELINUX_HACKS*/
+ return 0; /* No. */
+}
+
+/* Return true if FNAME is corresponds to a secured file. Using NULL,
+ "" or "-" for FS is allowed and will return false. This function is
+ used before creating a file, thus it won't fail if the file does
+ not exist. */
+int
+is_secured_filename (const char *fname)
+{
+#ifdef ENABLE_SELINUX_HACKS
+ struct stat buf;
+ struct secured_file_item *sf;
+
+ if (iobuf_is_pipe_filename (fname) || !*fname)
+ return 0;
+
+ /* Note that we print out a error here and claim that a file is
+ secure if something went wrong. */
+ if (gnupg_stat (fname, &buf))
+ {
+ if (errno == ENOENT || errno == EPERM || errno == EACCES)
+ return 0;
+ log_error (_("fstat of '%s' failed in %s: %s\n"), fname,
+ "is_secured_filename", strerror (errno));
+ return 1;
+ }
+/* log_debug ("is_secured_filename (%s) i=%lu.%lu\n", fname, */
+/* (unsigned long)buf.st_dev, (unsigned long)buf.st_ino); */
+ for (sf=secured_files; sf; sf = sf->next)
+ {
+ if (sf->ino == buf.st_ino && sf->dev == buf.st_dev)
+ return 1; /* Yes. */
+ }
+#else /*!ENABLE_SELINUX_HACKS*/
+ (void)fname;
+#endif /*!ENABLE_SELINUX_HACKS*/
+ return 0; /* No. */
+}
+
+
+
+u16
+checksum_u16( unsigned n )
+{
+ u16 a;
+
+ a = (n >> 8) & 0xff;
+ a += n & 0xff;
+ return a;
+}
+
+
+u16
+checksum( byte *p, unsigned n )
+{
+ u16 a;
+
+ for(a=0; n; n-- )
+ a += *p++;
+ return a;
+}
+
+u16
+checksum_mpi (gcry_mpi_t a)
+{
+ u16 csum;
+ byte *buffer;
+ size_t nbytes;
+
+ if ( gcry_mpi_print (GCRYMPI_FMT_PGP, NULL, 0, &nbytes, a) )
+ BUG ();
+ /* Fixme: For numbers not in secure memory we should use a stack
+ * based buffer and only allocate a larger one if mpi_print returns
+ * an error. */
+ buffer = (gcry_is_secure(a)?
+ gcry_xmalloc_secure (nbytes) : gcry_xmalloc (nbytes));
+ if ( gcry_mpi_print (GCRYMPI_FMT_PGP, buffer, nbytes, NULL, a) )
+ BUG ();
+ csum = checksum (buffer, nbytes);
+ xfree (buffer);
+ return csum;
+}
+
+
+void
+print_pubkey_algo_note (pubkey_algo_t algo)
+{
+ if(algo >= 100 && algo <= 110)
+ {
+ static int warn=0;
+ if(!warn)
+ {
+ warn=1;
+ es_fflush (es_stdout);
+ log_info (_("WARNING: using experimental public key algorithm %s\n"),
+ openpgp_pk_algo_name (algo));
+ }
+ }
+ else if (algo == PUBKEY_ALGO_ELGAMAL)
+ {
+ es_fflush (es_stdout);
+ log_info (_("WARNING: Elgamal sign+encrypt keys are deprecated\n"));
+ }
+}
+
+void
+print_cipher_algo_note (cipher_algo_t algo)
+{
+ if(algo >= 100 && algo <= 110)
+ {
+ static int warn=0;
+ if(!warn)
+ {
+ warn=1;
+ es_fflush (es_stdout);
+ log_info (_("WARNING: using experimental cipher algorithm %s\n"),
+ openpgp_cipher_algo_name (algo));
+ }
+ }
+}
+
+void
+print_digest_algo_note (digest_algo_t algo)
+{
+ if(algo >= 100 && algo <= 110)
+ {
+ static int warn=0;
+ const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+
+ if(!warn)
+ {
+ warn=1;
+ es_fflush (es_stdout);
+ log_info (_("WARNING: using experimental digest algorithm %s\n"),
+ gcry_md_algo_name (galgo));
+ }
+ }
+ else if (is_weak_digest (algo))
+ {
+ const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+ es_fflush (es_stdout);
+ log_info (_("WARNING: digest algorithm %s is deprecated\n"),
+ gcry_md_algo_name (galgo));
+ }
+}
+
+
+void
+print_digest_rejected_note (enum gcry_md_algos algo)
+{
+ struct weakhash* weak;
+ int show = 1;
+
+ if (opt.quiet)
+ return;
+
+ for (weak = opt.weak_digests; weak; weak = weak->next)
+ if (weak->algo == algo)
+ {
+ if (weak->rejection_shown)
+ show = 0;
+ else
+ weak->rejection_shown = 1;
+ break;
+ }
+
+ if (show)
+ {
+ es_fflush (es_stdout);
+ log_info
+ (_("Note: signatures using the %s algorithm are rejected\n"),
+ gcry_md_algo_name(algo));
+ }
+}
+
+
+void
+print_sha1_keysig_rejected_note (void)
+{
+ static int shown;
+
+ if (shown || opt.quiet)
+ return;
+
+ shown = 1;
+ es_fflush (es_stdout);
+ log_info (_("Note: third-party key signatures using"
+ " the %s algorithm are rejected\n"),
+ gcry_md_algo_name (GCRY_MD_SHA1));
+ print_further_info ("use option \"%s\" to override",
+ "--allow-weak-key-signatures");
+}
+
+
+/* Print a message
+ * "(reported error: %s)\n
+ * in verbose mode to further explain an error. If the error code has
+ * the value IGNORE_EC no message is printed. A message is also not
+ * printed if ERR is 0. */
+void
+print_reported_error (gpg_error_t err, gpg_err_code_t ignore_ec)
+{
+ if (!opt.verbose)
+ return;
+
+ if (!gpg_err_code (err))
+ ;
+ else if (gpg_err_code (err) == ignore_ec)
+ ;
+ else if (gpg_err_source (err) == GPG_ERR_SOURCE_DEFAULT)
+ log_info (_("(reported error: %s)\n"),
+ gpg_strerror (err));
+ else
+ log_info (_("(reported error: %s <%s>)\n"),
+ gpg_strerror (err), gpg_strsource (err));
+
+}
+
+
+/* Print a message
+ * "(further info: %s)\n
+ * in verbose mode to further explain an error. That message is
+ * intended to help debug a problem and should not be translated.
+ */
+void
+print_further_info (const char *format, ...)
+{
+ va_list arg_ptr;
+
+ if (!opt.verbose)
+ return;
+
+ log_info (_("(further info: "));
+ va_start (arg_ptr, format);
+ log_logv (GPGRT_LOG_CONT, format, arg_ptr);
+ va_end (arg_ptr);
+ log_printf (")\n");
+}
+
+
+/* Map OpenPGP algo numbers to those used by Libgcrypt. We need to do
+ this for algorithms we implemented in Libgcrypt after they become
+ part of OpenPGP. */
+enum gcry_cipher_algos
+map_cipher_openpgp_to_gcry (cipher_algo_t algo)
+{
+ switch (algo)
+ {
+ case CIPHER_ALGO_NONE: return GCRY_CIPHER_NONE;
+
+#ifdef GPG_USE_IDEA
+ case CIPHER_ALGO_IDEA: return GCRY_CIPHER_IDEA;
+#else
+ case CIPHER_ALGO_IDEA: return 0;
+#endif
+
+ case CIPHER_ALGO_3DES: return GCRY_CIPHER_3DES;
+
+#ifdef GPG_USE_CAST5
+ case CIPHER_ALGO_CAST5: return GCRY_CIPHER_CAST5;
+#else
+ case CIPHER_ALGO_CAST5: return 0;
+#endif
+
+#ifdef GPG_USE_BLOWFISH
+ case CIPHER_ALGO_BLOWFISH: return GCRY_CIPHER_BLOWFISH;
+#else
+ case CIPHER_ALGO_BLOWFISH: return 0;
+#endif
+
+#ifdef GPG_USE_AES128
+ case CIPHER_ALGO_AES: return GCRY_CIPHER_AES;
+#else
+ case CIPHER_ALGO_AES: return 0;
+#endif
+
+#ifdef GPG_USE_AES192
+ case CIPHER_ALGO_AES192: return GCRY_CIPHER_AES192;
+#else
+ case CIPHER_ALGO_AES192: return 0;
+#endif
+
+#ifdef GPG_USE_AES256
+ case CIPHER_ALGO_AES256: return GCRY_CIPHER_AES256;
+#else
+ case CIPHER_ALGO_AES256: return 0;
+#endif
+
+#ifdef GPG_USE_TWOFISH
+ case CIPHER_ALGO_TWOFISH: return GCRY_CIPHER_TWOFISH;
+#else
+ case CIPHER_ALGO_TWOFISH: return 0;
+#endif
+
+#ifdef GPG_USE_CAMELLIA128
+ case CIPHER_ALGO_CAMELLIA128: return GCRY_CIPHER_CAMELLIA128;
+#else
+ case CIPHER_ALGO_CAMELLIA128: return 0;
+#endif
+
+#ifdef GPG_USE_CAMELLIA192
+ case CIPHER_ALGO_CAMELLIA192: return GCRY_CIPHER_CAMELLIA192;
+#else
+ case CIPHER_ALGO_CAMELLIA192: return 0;
+#endif
+
+#ifdef GPG_USE_CAMELLIA256
+ case CIPHER_ALGO_CAMELLIA256: return GCRY_CIPHER_CAMELLIA256;
+#else
+ case CIPHER_ALGO_CAMELLIA256: return 0;
+#endif
+ default: return 0;
+ }
+}
+
+/* The inverse function of above. */
+static cipher_algo_t
+map_cipher_gcry_to_openpgp (enum gcry_cipher_algos algo)
+{
+ switch (algo)
+ {
+ case GCRY_CIPHER_NONE: return CIPHER_ALGO_NONE;
+ case GCRY_CIPHER_IDEA: return CIPHER_ALGO_IDEA;
+ case GCRY_CIPHER_3DES: return CIPHER_ALGO_3DES;
+ case GCRY_CIPHER_CAST5: return CIPHER_ALGO_CAST5;
+ case GCRY_CIPHER_BLOWFISH: return CIPHER_ALGO_BLOWFISH;
+ case GCRY_CIPHER_AES: return CIPHER_ALGO_AES;
+ case GCRY_CIPHER_AES192: return CIPHER_ALGO_AES192;
+ case GCRY_CIPHER_AES256: return CIPHER_ALGO_AES256;
+ case GCRY_CIPHER_TWOFISH: return CIPHER_ALGO_TWOFISH;
+ case GCRY_CIPHER_CAMELLIA128: return CIPHER_ALGO_CAMELLIA128;
+ case GCRY_CIPHER_CAMELLIA192: return CIPHER_ALGO_CAMELLIA192;
+ case GCRY_CIPHER_CAMELLIA256: return CIPHER_ALGO_CAMELLIA256;
+ default: return 0;
+ }
+}
+
+/* Map Gcrypt public key algorithm numbers to those used by OpenPGP.
+ FIXME: This mapping is used at only two places - we should get rid
+ of it. */
+pubkey_algo_t
+map_pk_gcry_to_openpgp (enum gcry_pk_algos algo)
+{
+ switch (algo)
+ {
+ case GCRY_PK_EDDSA: return PUBKEY_ALGO_EDDSA;
+ case GCRY_PK_ECDSA: return PUBKEY_ALGO_ECDSA;
+ case GCRY_PK_ECDH: return PUBKEY_ALGO_ECDH;
+ default: return algo < 110 ? (pubkey_algo_t)algo : 0;
+ }
+}
+
+
+/* Return the block length of an OpenPGP cipher algorithm. */
+int
+openpgp_cipher_blocklen (cipher_algo_t algo)
+{
+ /* We use the numbers from OpenPGP to be sure that we get the right
+ block length. This is so that the packet parsing code works even
+ for unknown algorithms (for which we assume 8 due to tradition).
+
+ NOTE: If you change the returned blocklen above 16, check
+ the callers because they may use a fixed size buffer of that
+ size. */
+ switch (algo)
+ {
+ case CIPHER_ALGO_AES:
+ case CIPHER_ALGO_AES192:
+ case CIPHER_ALGO_AES256:
+ case CIPHER_ALGO_TWOFISH:
+ case CIPHER_ALGO_CAMELLIA128:
+ case CIPHER_ALGO_CAMELLIA192:
+ case CIPHER_ALGO_CAMELLIA256:
+ return 16;
+
+ default:
+ return 8;
+ }
+}
+
+/****************
+ * Wrapper around the libgcrypt function with additional checks on
+ * the OpenPGP contraints for the algo ID.
+ */
+int
+openpgp_cipher_test_algo (cipher_algo_t algo)
+{
+ enum gcry_cipher_algos ga;
+
+ ga = map_cipher_openpgp_to_gcry (algo);
+ if (!ga)
+ return gpg_error (GPG_ERR_CIPHER_ALGO);
+
+ return gcry_cipher_test_algo (ga);
+}
+
+/* Map the OpenPGP cipher algorithm whose ID is contained in ALGORITHM to a
+ string representation of the algorithm name. For unknown algorithm
+ IDs this function returns "?". */
+const char *
+openpgp_cipher_algo_name (cipher_algo_t algo)
+{
+ switch (algo)
+ {
+ case CIPHER_ALGO_IDEA: return "IDEA";
+ case CIPHER_ALGO_3DES: return "3DES";
+ case CIPHER_ALGO_CAST5: return "CAST5";
+ case CIPHER_ALGO_BLOWFISH: return "BLOWFISH";
+ case CIPHER_ALGO_AES: return "AES";
+ case CIPHER_ALGO_AES192: return "AES192";
+ case CIPHER_ALGO_AES256: return "AES256";
+ case CIPHER_ALGO_TWOFISH: return "TWOFISH";
+ case CIPHER_ALGO_CAMELLIA128: return "CAMELLIA128";
+ case CIPHER_ALGO_CAMELLIA192: return "CAMELLIA192";
+ case CIPHER_ALGO_CAMELLIA256: return "CAMELLIA256";
+ case CIPHER_ALGO_NONE:
+ default: return "?";
+ }
+}
+
+
+/* Same as openpgp_cipher_algo_name but returns a string in the form
+ * "ALGO.MODE" if AEAD is not 0. Note that in this version we do not
+ * print "ALGO.CFB" as we do in 2.3 to avoid confusing users. */
+const char *
+openpgp_cipher_algo_mode_name (cipher_algo_t algo, aead_algo_t aead)
+{
+
+ if (aead == AEAD_ALGO_NONE)
+ return openpgp_cipher_algo_name (algo);
+
+ return map_static_strings ("openpgp_cipher_algo_mode_name", algo, aead,
+ openpgp_cipher_algo_name (algo),
+ ".",
+ openpgp_aead_algo_name (aead),
+ NULL);
+}
+
+
+/* Return 0 if ALGO is supported. Return an error if not. */
+gpg_error_t
+openpgp_aead_test_algo (aead_algo_t algo)
+{
+ /* FIXME: We currently have no easy way to test whether libgcrypt
+ * implements a mode. The only way we can do this is to open a
+ * cipher context with that mode and close it immediately. That is
+ * a bit costly. So we look at the libgcrypt version and assume
+ * nothing has been patched out. */
+ switch (algo)
+ {
+ case AEAD_ALGO_NONE:
+ break;
+
+ case AEAD_ALGO_EAX:
+#if GCRYPT_VERSION_NUMBER < 0x010900
+ break;
+#else
+ return 0;
+#endif
+
+ case AEAD_ALGO_OCB:
+ return 0;
+ }
+
+ return gpg_error (GPG_ERR_INV_CIPHER_MODE);
+}
+
+
+/* Map the OpenPGP AEAD algorithm with ID ALGO to a string
+ * representation of the algorithm name. For unknown algorithm IDs
+ * this function returns "?". */
+const char *
+openpgp_aead_algo_name (aead_algo_t algo)
+{
+ switch (algo)
+ {
+ case AEAD_ALGO_NONE: break;
+ case AEAD_ALGO_EAX: return "EAX";
+ case AEAD_ALGO_OCB: return "OCB";
+ }
+
+ return "?";
+}
+
+
+/* Return information for the AEAD algorithm ALGO. The corresponding
+ * Libgcrypt ciphermode is stored at R_MODE and the required number of
+ * octets for the nonce at R_NONCELEN. On error and error code is
+ * returned. Note that the taglen is always 128 bits. */
+gpg_error_t
+openpgp_aead_algo_info (aead_algo_t algo, enum gcry_cipher_modes *r_mode,
+ unsigned int *r_noncelen)
+{
+ switch (algo)
+ {
+ case AEAD_ALGO_OCB:
+ *r_mode = GCRY_CIPHER_MODE_OCB;
+ *r_noncelen = 15;
+ break;
+
+ case AEAD_ALGO_EAX:
+ *r_mode = MY_GCRY_CIPHER_MODE_EAX;
+ *r_noncelen = 16;
+ break;
+
+ default:
+ log_error ("unsupported AEAD algo %d\n", algo);
+ return gpg_error (GPG_ERR_INV_CIPHER_MODE);
+ }
+ return 0;
+}
+
+
+/* Return 0 if ALGO is a supported OpenPGP public key algorithm. */
+int
+openpgp_pk_test_algo (pubkey_algo_t algo)
+{
+ return openpgp_pk_test_algo2 (algo, 0);
+}
+
+
+/* Return 0 if ALGO is a supported OpenPGP public key algorithm and
+ allows the usage USE. */
+int
+openpgp_pk_test_algo2 (pubkey_algo_t algo, unsigned int use)
+{
+ enum gcry_pk_algos ga = 0;
+ size_t use_buf = use;
+
+ switch (algo)
+ {
+#ifdef GPG_USE_RSA
+ case PUBKEY_ALGO_RSA: ga = GCRY_PK_RSA; break;
+ case PUBKEY_ALGO_RSA_E: ga = GCRY_PK_RSA_E; break;
+ case PUBKEY_ALGO_RSA_S: ga = GCRY_PK_RSA_S; break;
+#else
+ case PUBKEY_ALGO_RSA: break;
+ case PUBKEY_ALGO_RSA_E: break;
+ case PUBKEY_ALGO_RSA_S: break;
+#endif
+
+ case PUBKEY_ALGO_ELGAMAL_E: ga = GCRY_PK_ELG; break;
+ case PUBKEY_ALGO_DSA: ga = GCRY_PK_DSA; break;
+
+#ifdef GPG_USE_ECDH
+ case PUBKEY_ALGO_ECDH: ga = GCRY_PK_ECC; break;
+#else
+ case PUBKEY_ALGO_ECDH: break;
+#endif
+
+#ifdef GPG_USE_ECDSA
+ case PUBKEY_ALGO_ECDSA: ga = GCRY_PK_ECC; break;
+#else
+ case PUBKEY_ALGO_ECDSA: break;
+#endif
+
+#ifdef GPG_USE_EDDSA
+ case PUBKEY_ALGO_EDDSA: ga = GCRY_PK_ECC; break;
+#else
+ case PUBKEY_ALGO_EDDSA: break;
+#endif
+
+ case PUBKEY_ALGO_ELGAMAL:
+ /* Dont't allow type 20 keys unless in rfc2440 mode. */
+ if (RFC2440)
+ ga = GCRY_PK_ELG;
+ break;
+
+ default:
+ break;
+ }
+ if (!ga)
+ return gpg_error (GPG_ERR_PUBKEY_ALGO);
+
+ /* Elgamal in OpenPGP used to support signing and Libgcrypt still
+ * does. However, we removed the signing capability from gpg ages
+ * ago. This function should reflect this so that errors are thrown
+ * early and not only when we try to sign using Elgamal. */
+ if (ga == GCRY_PK_ELG && (use & (PUBKEY_USAGE_CERT | PUBKEY_USAGE_SIG)))
+ return gpg_error (GPG_ERR_WRONG_PUBKEY_ALGO);
+
+ /* Now check whether Libgcrypt has support for the algorithm. */
+ return gcry_pk_algo_info (ga, GCRYCTL_TEST_ALGO, NULL, &use_buf);
+}
+
+
+int
+openpgp_pk_algo_usage ( int algo )
+{
+ int use = 0;
+
+ /* They are hardwired in gpg 1.0. */
+ switch ( algo ) {
+ case PUBKEY_ALGO_RSA:
+ use = (PUBKEY_USAGE_CERT | PUBKEY_USAGE_SIG
+ | PUBKEY_USAGE_ENC | PUBKEY_USAGE_AUTH);
+ break;
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_ECDH:
+ use = PUBKEY_USAGE_ENC;
+ break;
+ case PUBKEY_ALGO_RSA_S:
+ use = PUBKEY_USAGE_CERT | PUBKEY_USAGE_SIG;
+ break;
+ case PUBKEY_ALGO_ELGAMAL:
+ if (RFC2440)
+ use = PUBKEY_USAGE_ENC;
+ break;
+ case PUBKEY_ALGO_ELGAMAL_E:
+ use = PUBKEY_USAGE_ENC;
+ break;
+ case PUBKEY_ALGO_DSA:
+ use = PUBKEY_USAGE_CERT | PUBKEY_USAGE_SIG | PUBKEY_USAGE_AUTH;
+ break;
+ case PUBKEY_ALGO_ECDSA:
+ case PUBKEY_ALGO_EDDSA:
+ use = PUBKEY_USAGE_CERT | PUBKEY_USAGE_SIG | PUBKEY_USAGE_AUTH;
+ default:
+ break;
+ }
+ return use;
+}
+
+/* Map the OpenPGP pubkey algorithm whose ID is contained in ALGO to a
+ string representation of the algorithm name. For unknown algorithm
+ IDs this function returns "?". */
+const char *
+openpgp_pk_algo_name (pubkey_algo_t algo)
+{
+ switch (algo)
+ {
+ case PUBKEY_ALGO_RSA:
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_RSA_S: return "RSA";
+ case PUBKEY_ALGO_ELGAMAL:
+ case PUBKEY_ALGO_ELGAMAL_E: return "ELG";
+ case PUBKEY_ALGO_DSA: return "DSA";
+ case PUBKEY_ALGO_ECDH: return "ECDH";
+ case PUBKEY_ALGO_ECDSA: return "ECDSA";
+ case PUBKEY_ALGO_EDDSA: return "EDDSA";
+ default: return "?";
+ }
+}
+
+
+/* Explicit mapping of OpenPGP digest algos to Libgcrypt. */
+/* FIXME: We do not yes use it everywhere. */
+enum gcry_md_algos
+map_md_openpgp_to_gcry (digest_algo_t algo)
+{
+ switch (algo)
+ {
+#ifdef GPG_USE_MD5
+ case DIGEST_ALGO_MD5: return GCRY_MD_MD5;
+#else
+ case DIGEST_ALGO_MD5: return 0;
+#endif
+
+ case DIGEST_ALGO_SHA1: return GCRY_MD_SHA1;
+
+#ifdef GPG_USE_RMD160
+ case DIGEST_ALGO_RMD160: return GCRY_MD_RMD160;
+#else
+ case DIGEST_ALGO_RMD160: return 0;
+#endif
+
+#ifdef GPG_USE_SHA224
+ case DIGEST_ALGO_SHA224: return GCRY_MD_SHA224;
+#else
+ case DIGEST_ALGO_SHA224: return 0;
+#endif
+
+ case DIGEST_ALGO_SHA256: return GCRY_MD_SHA256;
+
+#ifdef GPG_USE_SHA384
+ case DIGEST_ALGO_SHA384: return GCRY_MD_SHA384;
+#else
+ case DIGEST_ALGO_SHA384: return 0;
+#endif
+
+#ifdef GPG_USE_SHA512
+ case DIGEST_ALGO_SHA512: return GCRY_MD_SHA512;
+#else
+ case DIGEST_ALGO_SHA512: return 0;
+#endif
+ default: return 0;
+ }
+}
+
+
+/* Return 0 if ALGO is suitable and implemented OpenPGP hash
+ algorithm. */
+int
+openpgp_md_test_algo (digest_algo_t algo)
+{
+ enum gcry_md_algos ga;
+
+ ga = map_md_openpgp_to_gcry (algo);
+ if (!ga)
+ return gpg_error (GPG_ERR_DIGEST_ALGO);
+
+ return gcry_md_test_algo (ga);
+}
+
+
+/* Map the OpenPGP digest algorithm whose ID is contained in ALGO to a
+ string representation of the algorithm name. For unknown algorithm
+ IDs this function returns "?". */
+const char *
+openpgp_md_algo_name (int algo)
+{
+ switch (algo)
+ {
+ case DIGEST_ALGO_MD5: return "MD5";
+ case DIGEST_ALGO_SHA1: return "SHA1";
+ case DIGEST_ALGO_RMD160: return "RIPEMD160";
+ case DIGEST_ALGO_SHA256: return "SHA256";
+ case DIGEST_ALGO_SHA384: return "SHA384";
+ case DIGEST_ALGO_SHA512: return "SHA512";
+ case DIGEST_ALGO_SHA224: return "SHA224";
+ }
+ return "?";
+}
+
+
+static unsigned long
+get_signature_count (PKT_public_key *pk)
+{
+#ifdef ENABLE_CARD_SUPPORT
+ struct agent_card_info_s info;
+
+ (void)pk;
+ if (!agent_scd_getattr ("SIG-COUNTER",&info))
+ return info.sig_counter;
+ else
+ return 0;
+#else
+ (void)pk;
+ return 0;
+#endif
+}
+
+/* Expand %-strings. Returns a string which must be xfreed. Returns
+ NULL if the string cannot be expanded (too large). */
+char *
+pct_expando(const char *string,struct expando_args *args)
+{
+ const char *ch=string;
+ int idx=0,maxlen=0,done=0;
+ u32 pk_keyid[2]={0,0},sk_keyid[2]={0,0};
+ char *ret=NULL;
+
+ /* The parser below would return NULL for an empty string, thus we
+ * catch it here. Also catch NULL here. */
+ if (!string || !*string)
+ return xstrdup ("");
+
+ if(args->pk)
+ keyid_from_pk(args->pk,pk_keyid);
+
+ if(args->pksk)
+ keyid_from_pk (args->pksk, sk_keyid);
+
+ /* This is used so that %k works in photoid command strings in
+ --list-secret-keys (which of course has a sk, but no pk). */
+ if(!args->pk && args->pksk)
+ keyid_from_pk (args->pksk, pk_keyid);
+
+ while(*ch!='\0')
+ {
+ if(!done)
+ {
+ /* 8192 is way bigger than we'll need here */
+ if(maxlen>=8192)
+ goto fail;
+
+ maxlen+=1024;
+ ret=xrealloc(ret,maxlen);
+ }
+
+ done=0;
+
+ if(*ch=='%')
+ {
+ switch(*(ch+1))
+ {
+ case 's': /* short key id */
+ if(idx+8<maxlen)
+ {
+ sprintf(&ret[idx],"%08lX",(ulong)sk_keyid[1]);
+ idx+=8;
+ done=1;
+ }
+ break;
+
+ case 'S': /* long key id */
+ if(idx+16<maxlen)
+ {
+ sprintf(&ret[idx],"%08lX%08lX",
+ (ulong)sk_keyid[0],(ulong)sk_keyid[1]);
+ idx+=16;
+ done=1;
+ }
+ break;
+
+ case 'k': /* short key id */
+ if(idx+8<maxlen)
+ {
+ sprintf(&ret[idx],"%08lX",(ulong)pk_keyid[1]);
+ idx+=8;
+ done=1;
+ }
+ break;
+
+ case 'K': /* long key id */
+ if(idx+16<maxlen)
+ {
+ sprintf(&ret[idx],"%08lX%08lX",
+ (ulong)pk_keyid[0],(ulong)pk_keyid[1]);
+ idx+=16;
+ done=1;
+ }
+ break;
+
+ case 'U': /* z-base-32 encoded user id hash. */
+ if (args->namehash)
+ {
+ char *tmp = zb32_encode (args->namehash, 8*20);
+ if (tmp)
+ {
+ if (idx + strlen (tmp) < maxlen)
+ {
+ strcpy (ret+idx, tmp);
+ idx += strlen (tmp);
+ }
+ xfree (tmp);
+ done = 1;
+ }
+ }
+ break;
+
+ case 'c': /* signature count from card, if any. */
+ if(idx+10<maxlen)
+ {
+ sprintf (&ret[idx],"%lu", get_signature_count (args->pksk));
+ idx+=strlen(&ret[idx]);
+ done=1;
+ }
+ break;
+
+ case 'f': /* Fingerprint of key being signed */
+ case 'p': /* Fingerprint of the primary key making the signature. */
+ case 'g': /* Fingerprint of the key making the signature. */
+ {
+ byte array[MAX_FINGERPRINT_LEN];
+ size_t len;
+ int i;
+
+ if ((*(ch+1))=='f' && args->pk)
+ fingerprint_from_pk (args->pk, array, &len);
+ else if ((*(ch+1))=='p' && args->pksk)
+ {
+ if(args->pksk->flags.primary)
+ fingerprint_from_pk (args->pksk, array, &len);
+ else if (args->pksk->main_keyid[0]
+ || args->pksk->main_keyid[1])
+ {
+ /* Not the primary key: Find the fingerprint
+ of the primary key. */
+ PKT_public_key *pk=
+ xmalloc_clear(sizeof(PKT_public_key));
+
+ if (!get_pubkey_fast (pk,args->pksk->main_keyid))
+ fingerprint_from_pk (pk, array, &len);
+ else
+ memset (array, 0, (len=MAX_FINGERPRINT_LEN));
+ free_public_key (pk);
+ }
+ else /* Oops: info about the primary key missing. */
+ memset(array,0,(len=MAX_FINGERPRINT_LEN));
+ }
+ else if((*(ch+1))=='g' && args->pksk)
+ fingerprint_from_pk (args->pksk, array, &len);
+ else
+ memset(array,0,(len=MAX_FINGERPRINT_LEN));
+
+ if(idx+(len*2)<maxlen)
+ {
+ for(i=0;i<len;i++)
+ {
+ sprintf(&ret[idx],"%02X",array[i]);
+ idx+=2;
+ }
+ done=1;
+ }
+ }
+ break;
+
+ case 'v': /* validity letters */
+ if(args->validity_info && idx+1<maxlen)
+ {
+ ret[idx++]=args->validity_info;
+ ret[idx]='\0';
+ done=1;
+ }
+ break;
+
+ /* The text string types */
+ case 't':
+ case 'T':
+ case 'V':
+ {
+ const char *str=NULL;
+
+ switch(*(ch+1))
+ {
+ case 't': /* e.g. "jpg" */
+ str=image_type_to_string(args->imagetype,0);
+ break;
+
+ case 'T': /* e.g. "image/jpeg" */
+ str=image_type_to_string(args->imagetype,2);
+ break;
+
+ case 'V': /* e.g. "full", "expired", etc. */
+ str=args->validity_string;
+ break;
+ }
+
+ if(str && idx+strlen(str)<maxlen)
+ {
+ strcpy(&ret[idx],str);
+ idx+=strlen(str);
+ done=1;
+ }
+ }
+ break;
+
+ case '%':
+ if(idx+1<maxlen)
+ {
+ ret[idx++]='%';
+ ret[idx]='\0';
+ done=1;
+ }
+ break;
+
+ /* Any unknown %-keys (like %i, %o, %I, and %O) are
+ passed through for later expansion. Note this also
+ handles the case where the last character in the
+ string is a '%' - the terminating \0 will end up here
+ and properly terminate the string. */
+ default:
+ if(idx+2<maxlen)
+ {
+ ret[idx++]='%';
+ ret[idx++]=*(ch+1);
+ ret[idx]='\0';
+ done=1;
+ }
+ break;
+ }
+
+ if(done)
+ ch++;
+ }
+ else
+ {
+ if(idx+1<maxlen)
+ {
+ ret[idx++]=*ch;
+ ret[idx]='\0';
+ done=1;
+ }
+ }
+
+ if(done)
+ ch++;
+ }
+
+ return ret;
+
+ fail:
+ xfree(ret);
+ return NULL;
+}
+
+void
+deprecated_warning(const char *configname,unsigned int configlineno,
+ const char *option,const char *repl1,const char *repl2)
+{
+ if(configname)
+ {
+ if(strncmp("--",option,2)==0)
+ option+=2;
+
+ if(strncmp("--",repl1,2)==0)
+ repl1+=2;
+
+ log_info(_("%s:%d: deprecated option \"%s\"\n"),
+ configname,configlineno,option);
+ }
+ else
+ log_info(_("WARNING: \"%s\" is a deprecated option\n"),option);
+
+ log_info(_("please use \"%s%s\" instead\n"),repl1,repl2);
+}
+
+
+void
+deprecated_command (const char *name)
+{
+ log_info(_("WARNING: \"%s\" is a deprecated command - do not use it\n"),
+ name);
+}
+
+
+void
+obsolete_scdaemon_option (const char *configname, unsigned int configlineno,
+ const char *name)
+{
+ if (configname)
+ log_info (_("%s:%u: \"%s\" is obsolete in this file"
+ " - it only has effect in %s\n"),
+ configname, configlineno, name, SCDAEMON_NAME EXTSEP_S "conf");
+ else
+ log_info (_("WARNING: \"%s%s\" is an obsolete option"
+ " - it has no effect except on %s\n"),
+ "--", name, SCDAEMON_NAME);
+}
+
+
+/*
+ * Wrapper around gcry_cipher_map_name to provide a fallback using the
+ * "Sn" syntax as used by the preference strings.
+ */
+int
+string_to_cipher_algo (const char *string)
+{
+ int val;
+
+ val = map_cipher_gcry_to_openpgp (gcry_cipher_map_name (string));
+ if (!val && string && (string[0]=='S' || string[0]=='s'))
+ {
+ char *endptr;
+
+ string++;
+ val = strtol (string, &endptr, 10);
+ if (!*string || *endptr || openpgp_cipher_test_algo (val))
+ val = 0;
+ }
+
+ return val;
+}
+
+/*
+ * Wrapper around gcry_md_map_name to provide a fallback using the
+ * "Hn" syntax as used by the preference strings.
+ */
+int
+string_to_digest_algo (const char *string)
+{
+ int val;
+
+ /* FIXME: We should make use of our wrapper function and not assume
+ that there is a 1 to 1 mapping between OpenPGP and Libgcrypt. */
+ val = gcry_md_map_name (string);
+ if (!val && string && (string[0]=='H' || string[0]=='h'))
+ {
+ char *endptr;
+
+ string++;
+ val = strtol (string, &endptr, 10);
+ if (!*string || *endptr || openpgp_md_test_algo (val))
+ val = 0;
+ }
+
+ return val;
+}
+
+
+
+const char *
+compress_algo_to_string(int algo)
+{
+ const char *s=NULL;
+
+ switch(algo)
+ {
+ case COMPRESS_ALGO_NONE:
+ s=_("Uncompressed");
+ break;
+
+ case COMPRESS_ALGO_ZIP:
+ s="ZIP";
+ break;
+
+ case COMPRESS_ALGO_ZLIB:
+ s="ZLIB";
+ break;
+
+#ifdef HAVE_BZIP2
+ case COMPRESS_ALGO_BZIP2:
+ s="BZIP2";
+ break;
+#endif
+ }
+
+ return s;
+}
+
+int
+string_to_compress_algo(const char *string)
+{
+ /* TRANSLATORS: See doc/TRANSLATE about this string. */
+ if(match_multistr(_("uncompressed|none"),string))
+ return 0;
+ else if(ascii_strcasecmp(string,"uncompressed")==0)
+ return 0;
+ else if(ascii_strcasecmp(string,"none")==0)
+ return 0;
+ else if(ascii_strcasecmp(string,"zip")==0)
+ return 1;
+ else if(ascii_strcasecmp(string,"zlib")==0)
+ return 2;
+#ifdef HAVE_BZIP2
+ else if(ascii_strcasecmp(string,"bzip2")==0)
+ return 3;
+#endif
+ else if(ascii_strcasecmp(string,"z0")==0)
+ return 0;
+ else if(ascii_strcasecmp(string,"z1")==0)
+ return 1;
+ else if(ascii_strcasecmp(string,"z2")==0)
+ return 2;
+#ifdef HAVE_BZIP2
+ else if(ascii_strcasecmp(string,"z3")==0)
+ return 3;
+#endif
+ else
+ return -1;
+}
+
+int
+check_compress_algo(int algo)
+{
+ switch (algo)
+ {
+ case 0: return 0;
+#ifdef HAVE_ZIP
+ case 1:
+ case 2: return 0;
+#endif
+#ifdef HAVE_BZIP2
+ case 3: return 0;
+#endif
+ default: return GPG_ERR_COMPR_ALGO;
+ }
+}
+
+int
+default_cipher_algo(void)
+{
+ if(opt.def_cipher_algo)
+ return opt.def_cipher_algo;
+ else if(opt.personal_cipher_prefs)
+ return opt.personal_cipher_prefs[0].value;
+ else
+ return opt.s2k_cipher_algo;
+}
+
+/* There is no default_digest_algo function, but see
+ sign.c:hash_for() */
+
+int
+default_compress_algo(void)
+{
+ if(opt.compress_algo!=-1)
+ return opt.compress_algo;
+ else if(opt.personal_compress_prefs)
+ return opt.personal_compress_prefs[0].value;
+ else
+ return DEFAULT_COMPRESS_ALGO;
+}
+
+
+void
+compliance_failure(void)
+{
+ char *ver="???";
+
+ switch(opt.compliance)
+ {
+ case CO_GNUPG:
+ ver="GnuPG";
+ break;
+
+ case CO_RFC4880:
+ ver="OpenPGP";
+ break;
+
+ case CO_RFC2440:
+ ver="OpenPGP (older)";
+ break;
+
+ case CO_PGP6:
+ ver="PGP 6.x";
+ break;
+
+ case CO_PGP7:
+ ver="PGP 7.x";
+ break;
+
+ case CO_PGP8:
+ ver="PGP 8.x";
+ break;
+
+ case CO_DE_VS:
+ /* For de-vs we do not allow any kind of fallback. */
+ write_status_failure ("compliance-check", gpg_error (GPG_ERR_FORBIDDEN));
+ log_error (_("operation forced to fail due to"
+ " unfulfilled compliance rules\n"));
+ g10_errors_seen = 1;
+ return;
+ }
+
+ log_info(_("this message may not be usable by %s\n"),ver);
+ opt.compliance=CO_GNUPG;
+}
+
+/* Break a string into successive option pieces. Accepts single word
+ options and key=value argument options. */
+char *
+optsep(char **stringp)
+{
+ char *tok,*end;
+
+ tok=*stringp;
+ if(tok)
+ {
+ end=strpbrk(tok," ,=");
+ if(end)
+ {
+ int sawequals=0;
+ char *ptr=end;
+
+ /* what we need to do now is scan along starting with *end,
+ If the next character we see (ignoring spaces) is an =
+ sign, then there is an argument. */
+
+ while(*ptr)
+ {
+ if(*ptr=='=')
+ sawequals=1;
+ else if(*ptr!=' ')
+ break;
+ ptr++;
+ }
+
+ /* There is an argument, so grab that too. At this point,
+ ptr points to the first character of the argument. */
+ if(sawequals)
+ {
+ /* Is it a quoted argument? */
+ if(*ptr=='"')
+ {
+ ptr++;
+ end=strchr(ptr,'"');
+ if(end)
+ end++;
+ }
+ else
+ end=strpbrk(ptr," ,");
+ }
+
+ if(end && *end)
+ {
+ *end='\0';
+ *stringp=end+1;
+ }
+ else
+ *stringp=NULL;
+ }
+ else
+ *stringp=NULL;
+ }
+
+ return tok;
+}
+
+/* Breaks an option value into key and value. Returns NULL if there
+ is no value. Note that "string" is modified to remove the =value
+ part. */
+char *
+argsplit(char *string)
+{
+ char *equals,*arg=NULL;
+
+ equals=strchr(string,'=');
+ if(equals)
+ {
+ char *quote,*space;
+
+ *equals='\0';
+ arg=equals+1;
+
+ /* Quoted arg? */
+ quote=strchr(arg,'"');
+ if(quote)
+ {
+ arg=quote+1;
+
+ quote=strchr(arg,'"');
+ if(quote)
+ *quote='\0';
+ }
+ else
+ {
+ size_t spaces;
+
+ /* Trim leading spaces off of the arg */
+ spaces=strspn(arg," ");
+ arg+=spaces;
+ }
+
+ /* Trim tailing spaces off of the tag */
+ space=strchr(string,' ');
+ if(space)
+ *space='\0';
+ }
+
+ return arg;
+}
+
+/* Return the length of the initial token, leaving off any
+ argument. */
+static size_t
+optlen(const char *s)
+{
+ char *end=strpbrk(s," =");
+
+ if(end)
+ return end-s;
+ else
+ return strlen(s);
+}
+
+int
+parse_options(char *str,unsigned int *options,
+ struct parse_options *opts,int noisy)
+{
+ char *tok;
+
+ if (str && !strcmp (str, "help"))
+ {
+ int i,maxlen=0;
+
+ /* Figure out the longest option name so we can line these up
+ neatly. */
+ for(i=0;opts[i].name;i++)
+ if(opts[i].help && maxlen<strlen(opts[i].name))
+ maxlen=strlen(opts[i].name);
+
+ for(i=0;opts[i].name;i++)
+ if(opts[i].help)
+ es_printf("%s%*s%s\n",opts[i].name,
+ maxlen+2-(int)strlen(opts[i].name),"",_(opts[i].help));
+
+ g10_exit(0);
+ }
+
+ while((tok=optsep(&str)))
+ {
+ int i,rev=0;
+ char *otok=tok;
+
+ if(tok[0]=='\0')
+ continue;
+
+ if(ascii_strncasecmp("no-",tok,3)==0)
+ {
+ rev=1;
+ tok+=3;
+ }
+
+ for(i=0;opts[i].name;i++)
+ {
+ size_t toklen=optlen(tok);
+
+ if(ascii_strncasecmp(opts[i].name,tok,toklen)==0)
+ {
+ /* We have a match, but it might be incomplete */
+ if(toklen!=strlen(opts[i].name))
+ {
+ int j;
+
+ for(j=i+1;opts[j].name;j++)
+ {
+ if(ascii_strncasecmp(opts[j].name,tok,toklen)==0)
+ {
+ if(noisy)
+ log_info(_("ambiguous option '%s'\n"),otok);
+ return 0;
+ }
+ }
+ }
+
+ if(rev)
+ {
+ *options&=~opts[i].bit;
+ if(opts[i].value)
+ *opts[i].value=NULL;
+ }
+ else
+ {
+ *options|=opts[i].bit;
+ if(opts[i].value)
+ *opts[i].value=argsplit(tok);
+ }
+ break;
+ }
+ }
+
+ if(!opts[i].name)
+ {
+ if(noisy)
+ log_info(_("unknown option '%s'\n"),otok);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+
+/* Similar to access(2), but uses PATH to find the file. */
+int
+path_access(const char *file,int mode)
+{
+ char *envpath;
+ int ret=-1;
+
+ envpath=getenv("PATH");
+
+ if(!envpath
+#ifdef HAVE_DRIVE_LETTERS
+ || (((file[0]>='A' && file[0]<='Z')
+ || (file[0]>='a' && file[0]<='z'))
+ && file[1]==':')
+#else
+ || file[0]=='/'
+#endif
+ )
+ return access(file,mode);
+ else
+ {
+ /* At least as large as, but most often larger than we need. */
+ char *buffer=xmalloc(strlen(envpath)+1+strlen(file)+1);
+ char *split,*item,*path=xstrdup(envpath);
+
+ split=path;
+
+ while((item=strsep(&split,PATHSEP_S)))
+ {
+ strcpy(buffer,item);
+ strcat(buffer,"/");
+ strcat(buffer,file);
+ ret=access(buffer,mode);
+ if(ret==0)
+ break;
+ }
+
+ xfree(path);
+ xfree(buffer);
+ }
+
+ return ret;
+}
+
+
+
+/* Return the number of public key parameters as used by OpenPGP. */
+int
+pubkey_get_npkey (pubkey_algo_t algo)
+{
+ switch (algo)
+ {
+ case PUBKEY_ALGO_RSA:
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_RSA_S: return 2;
+ case PUBKEY_ALGO_ELGAMAL_E: return 3;
+ case PUBKEY_ALGO_DSA: return 4;
+ case PUBKEY_ALGO_ECDH: return 3;
+ case PUBKEY_ALGO_ECDSA: return 2;
+ case PUBKEY_ALGO_ELGAMAL: return 3;
+ case PUBKEY_ALGO_EDDSA: return 2;
+ default: return 0;
+ }
+}
+
+
+/* Return the number of secret key parameters as used by OpenPGP. */
+int
+pubkey_get_nskey (pubkey_algo_t algo)
+{
+ switch (algo)
+ {
+ case PUBKEY_ALGO_RSA:
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_RSA_S: return 6;
+ case PUBKEY_ALGO_ELGAMAL_E: return 4;
+ case PUBKEY_ALGO_DSA: return 5;
+ case PUBKEY_ALGO_ECDH: return 4;
+ case PUBKEY_ALGO_ECDSA: return 3;
+ case PUBKEY_ALGO_ELGAMAL: return 4;
+ case PUBKEY_ALGO_EDDSA: return 3;
+ default: return 0;
+ }
+}
+
+/* Temporary helper. */
+int
+pubkey_get_nsig (pubkey_algo_t algo)
+{
+ switch (algo)
+ {
+ case PUBKEY_ALGO_RSA:
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_RSA_S: return 1;
+ case PUBKEY_ALGO_ELGAMAL_E: return 0;
+ case PUBKEY_ALGO_DSA: return 2;
+ case PUBKEY_ALGO_ECDH: return 0;
+ case PUBKEY_ALGO_ECDSA: return 2;
+ case PUBKEY_ALGO_ELGAMAL: return 2;
+ case PUBKEY_ALGO_EDDSA: return 2;
+ default: return 0;
+ }
+}
+
+
+/* Temporary helper. */
+int
+pubkey_get_nenc (pubkey_algo_t algo)
+{
+ switch (algo)
+ {
+ case PUBKEY_ALGO_RSA:
+ case PUBKEY_ALGO_RSA_E:
+ case PUBKEY_ALGO_RSA_S: return 1;
+ case PUBKEY_ALGO_ELGAMAL_E: return 2;
+ case PUBKEY_ALGO_DSA: return 0;
+ case PUBKEY_ALGO_ECDH: return 2;
+ case PUBKEY_ALGO_ECDSA: return 0;
+ case PUBKEY_ALGO_ELGAMAL: return 2;
+ case PUBKEY_ALGO_EDDSA: return 0;
+ default: return 0;
+ }
+}
+
+
+/* Temporary helper. */
+unsigned int
+pubkey_nbits( int algo, gcry_mpi_t *key )
+{
+ int rc, nbits;
+ gcry_sexp_t sexp;
+
+ if (algo == PUBKEY_ALGO_DSA
+ && key[0] && key[1] && key[2] && key[3])
+ {
+ rc = gcry_sexp_build (&sexp, NULL,
+ "(public-key(dsa(p%m)(q%m)(g%m)(y%m)))",
+ key[0], key[1], key[2], key[3] );
+ }
+ else if ((algo == PUBKEY_ALGO_ELGAMAL || algo == PUBKEY_ALGO_ELGAMAL_E)
+ && key[0] && key[1] && key[2])
+ {
+ rc = gcry_sexp_build (&sexp, NULL,
+ "(public-key(elg(p%m)(g%m)(y%m)))",
+ key[0], key[1], key[2] );
+ }
+ else if (is_RSA (algo)
+ && key[0] && key[1])
+ {
+ rc = gcry_sexp_build (&sexp, NULL,
+ "(public-key(rsa(n%m)(e%m)))",
+ key[0], key[1] );
+ }
+ else if ((algo == PUBKEY_ALGO_ECDSA || algo == PUBKEY_ALGO_ECDH
+ || algo == PUBKEY_ALGO_EDDSA)
+ && key[0] && key[1])
+ {
+ char *curve = openpgp_oid_to_str (key[0]);
+ if (!curve)
+ rc = gpg_error_from_syserror ();
+ else
+ {
+ rc = gcry_sexp_build (&sexp, NULL,
+ "(public-key(ecc(curve%s)(q%m)))",
+ curve, key[1]);
+ xfree (curve);
+ }
+ }
+ else
+ return 0;
+
+ if (rc)
+ BUG ();
+
+ nbits = gcry_pk_get_nbits (sexp);
+ gcry_sexp_release (sexp);
+ return nbits;
+}
+
+
+
+int
+mpi_print (estream_t fp, gcry_mpi_t a, int mode)
+{
+ int n = 0;
+ size_t nwritten;
+
+ if (!a)
+ return es_fprintf (fp, "[MPI_NULL]");
+ if (!mode)
+ {
+ unsigned int n1;
+ n1 = gcry_mpi_get_nbits(a);
+ n += es_fprintf (fp, "[%u bits]", n1);
+ }
+ else if (gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE))
+ {
+ unsigned int nbits;
+ unsigned char *p = gcry_mpi_get_opaque (a, &nbits);
+ if (!p)
+ n += es_fprintf (fp, "[invalid opaque value]");
+ else
+ {
+ if (!es_write_hexstring (fp, p, (nbits + 7)/8, 0, &nwritten))
+ n += nwritten;
+ }
+ }
+ else
+ {
+ unsigned char *buffer;
+ size_t buflen;
+
+ if (gcry_mpi_aprint (GCRYMPI_FMT_USG, &buffer, &buflen, a))
+ BUG ();
+ if (!es_write_hexstring (fp, buffer, buflen, 0, &nwritten))
+ n += nwritten;
+ gcry_free (buffer);
+ }
+ return n;
+}
+
+
+/* pkey[1] or skey[1] is Q for ECDSA, which is an uncompressed point,
+ i.e. 04 <x> <y> */
+unsigned int
+ecdsa_qbits_from_Q (unsigned int qbits)
+{
+ if ((qbits%8) > 3)
+ {
+ log_error (_("ECDSA public key is expected to be in SEC encoding "
+ "multiple of 8 bits\n"));
+ return 0;
+ }
+ qbits -= qbits%8;
+ qbits /= 2;
+ return qbits;
+}
+
+
+/* Ignore signatures and certifications made over certain digest
+ * algorithms by default, MD5 is considered weak. This allows users
+ * to deprecate support for other algorithms as well.
+ */
+void
+additional_weak_digest (const char* digestname)
+{
+ struct weakhash *weak = NULL;
+ const enum gcry_md_algos algo = string_to_digest_algo(digestname);
+
+ if (algo == GCRY_MD_NONE)
+ {
+ log_error (_("unknown weak digest '%s'\n"), digestname);
+ return;
+ }
+
+ /* Check to ensure it's not already present. */
+ for (weak = opt.weak_digests; weak; weak = weak->next)
+ if (algo == weak->algo)
+ return;
+
+ /* Add it to the head of the list. */
+ weak = xmalloc(sizeof(*weak));
+ weak->algo = algo;
+ weak->rejection_shown = 0;
+ weak->next = opt.weak_digests;
+ opt.weak_digests = weak;
+}
+
+
+/* Return true if ALGO is in the list of weak digests. */
+int
+is_weak_digest (digest_algo_t algo)
+{
+ const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+ const struct weakhash *weak;
+
+ for (weak = opt.weak_digests; weak; weak = weak->next)
+ if (weak->algo == galgo)
+ return 1;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 03:54:31 +0000