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gnupg/common/util.h
Werner Koch 935765b451
common: New function to uncompress an ECC public key. 
* common/sexputil.c (ec2os): New.
(uncompress_ecc_q_in_canon_sexp): New.

* common/t-sexputil.c (fail2): new.
(test_ecc_uncompress): New.
(main): Run new test.
--

Signed-off-by: Werner Koch <wk@gnupg.org>
2021-03-26 14:30:58 +01:00

432 lines
17 KiB
C
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/* util.h - Utility functions for GnuPG
* Copyright (C) 2001, 2002, 2003, 2004, 2009 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute and/or modify this
* part of GnuPG under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* or both in parallel, as here.
*
* 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 copies of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, see <https://www.gnu.org/licenses/>.
*/
#ifndef GNUPG_COMMON_UTIL_H
#define GNUPG_COMMON_UTIL_H
#include <gcrypt.h> /* We need this for the memory function protos. */
#include <errno.h> /* We need errno. */
#include <gpg-error.h> /* We need gpg_error_t and estream. */
/* These error codes are used but not defined in the required
* libgpg-error version. Define them here.
* Example: (#if GPG_ERROR_VERSION_NUMBER < 0x011500 // 1.21)
*/
#ifndef EXTERN_UNLESS_MAIN_MODULE
# if !defined (INCLUDED_BY_MAIN_MODULE)
# define EXTERN_UNLESS_MAIN_MODULE extern
# else
# define EXTERN_UNLESS_MAIN_MODULE
# endif
#endif
/* Hash function used with libksba. */
#define HASH_FNC ((void (*)(void *, const void*,size_t))gcry_md_write)
/* The length of the keygrip. This is a SHA-1 hash of the key
* parameters as generated by gcry_pk_get_keygrip. */
#define KEYGRIP_LEN 20
/* The length of the unique blob identifier as used by the keyboxd.
* This is the possible truncated fingerprint of the primary key. */
#define UBID_LEN 20
/* Get all the stuff from jnlib. */
#include "../common/logging.h"
#include "../common/stringhelp.h"
#include "../common/mischelp.h"
#include "../common/strlist.h"
#include "../common/dotlock.h"
#include "../common/utf8conv.h"
#include "../common/dynload.h"
#include "../common/fwddecl.h"
#include "../common/utilproto.h"
#include "gettime.h"
/* Redefine asprintf by our estream version which uses our own memory
allocator.. */
#define asprintf gpgrt_asprintf
#define vasprintf gpgrt_vasprintf
/* Due to a bug in mingw32's snprintf related to the 'l' modifier and
for increased portability we use our snprintf on all systems. */
#undef snprintf
#define snprintf gpgrt_snprintf
/* Replacements for macros not available with libgpg-error < 1.20. */
/* We need this type even if we are not using libreadline and or we
did not include libreadline in the current file. */
#ifndef GNUPG_LIBREADLINE_H_INCLUDED
typedef char **rl_completion_func_t (const char *, int, int);
#endif /*!GNUPG_LIBREADLINE_H_INCLUDED*/
/* Handy malloc macros - please use only them. */
#define xtrymalloc(a) gcry_malloc ((a))
#define xtrymalloc_secure(a) gcry_malloc_secure ((a))
#define xtrycalloc(a,b) gcry_calloc ((a),(b))
#define xtrycalloc_secure(a,b) gcry_calloc_secure ((a),(b))
#define xtryrealloc(a,b) gcry_realloc ((a),(b))
#define xtryreallocarray(a,b,c,d) gpgrt_reallocarray ((a),(b),(c),(d))
#define xtrystrdup(a) gcry_strdup ((a))
#define xfree(a) gcry_free ((a))
#define xfree_fnc gcry_free
#define xmalloc(a) gcry_xmalloc ((a))
#define xmalloc_secure(a) gcry_xmalloc_secure ((a))
#define xcalloc(a,b) gcry_xcalloc ((a),(b))
#define xcalloc_secure(a,b) gcry_xcalloc_secure ((a),(b))
#define xrealloc(a,b) gcry_xrealloc ((a),(b))
#define xstrdup(a) gcry_xstrdup ((a))
/* See also the xreallocarray prototype below. */
/* For compatibility with gpg 1.4 we also define these: */
#define xmalloc_clear(a) gcry_xcalloc (1, (a))
#define xmalloc_secure_clear(a) gcry_xcalloc_secure (1, (a))
/* The default error source of the application. This is different
from GPG_ERR_SOURCE_DEFAULT in that it does not depend on the
source file and thus is usable in code shared by applications.
Defined by init.c. */
extern gpg_err_source_t default_errsource;
/* Convenience function to return a gpg-error code for memory
allocation failures. This function makes sure that an error will
be returned even if accidentally ERRNO is not set. */
static inline gpg_error_t
out_of_core (void)
{
return gpg_error_from_syserror ();
}
/*-- yesno.c --*/
int answer_is_yes (const char *s);
int answer_is_yes_no_default (const char *s, int def_answer);
int answer_is_yes_no_quit (const char *s);
int answer_is_okay_cancel (const char *s, int def_answer);
/*-- xreadline.c --*/
ssize_t read_line (FILE *fp,
char **addr_of_buffer, size_t *length_of_buffer,
size_t *max_length);
/*-- b64enc.c and b64dec.c --*/
struct b64state
{
unsigned int flags;
int idx;
int quad_count;
FILE *fp;
estream_t stream;
char *title;
unsigned char radbuf[4];
u32 crc;
int stop_seen:1;
int invalid_encoding:1;
gpg_error_t lasterr;
};
gpg_error_t b64enc_start (struct b64state *state, FILE *fp, const char *title);
gpg_error_t b64enc_start_es (struct b64state *state, estream_t fp,
const char *title);
gpg_error_t b64enc_write (struct b64state *state,
const void *buffer, size_t nbytes);
gpg_error_t b64enc_finish (struct b64state *state);
gpg_error_t b64dec_start (struct b64state *state, const char *title);
gpg_error_t b64dec_proc (struct b64state *state, void *buffer, size_t length,
size_t *r_nbytes);
gpg_error_t b64dec_finish (struct b64state *state);
/*-- sexputil.c */
char *canon_sexp_to_string (const unsigned char *canon, size_t canonlen);
void log_printcanon (const char *text,
const unsigned char *sexp, size_t sexplen);
void log_printsexp (const char *text, gcry_sexp_t sexp);
gpg_error_t make_canon_sexp (gcry_sexp_t sexp,
unsigned char **r_buffer, size_t *r_buflen);
gpg_error_t make_canon_sexp_pad (gcry_sexp_t sexp, int secure,
unsigned char **r_buffer, size_t *r_buflen);
gpg_error_t keygrip_from_canon_sexp (const unsigned char *key, size_t keylen,
unsigned char *grip);
int cmp_simple_canon_sexp (const unsigned char *a, const unsigned char *b);
int cmp_canon_sexp (const unsigned char *a, size_t alen,
const unsigned char *b, size_t blen,
int (*tcmp)(void *ctx, int depth,
const unsigned char *aval, size_t avallen,
const unsigned char *bval, size_t bvallen),
void *tcmpctx);
unsigned char *make_simple_sexp_from_hexstr (const char *line,
size_t *nscanned);
int hash_algo_from_sigval (const unsigned char *sigval);
unsigned char *make_canon_sexp_from_rsa_pk (const void *m, size_t mlen,
const void *e, size_t elen,
size_t *r_len);
gpg_error_t get_rsa_pk_from_canon_sexp (const unsigned char *keydata,
size_t keydatalen,
unsigned char const **r_n,
size_t *r_nlen,
unsigned char const **r_e,
size_t *r_elen);
gpg_error_t get_ecc_q_from_canon_sexp (const unsigned char *keydata,
size_t keydatalen,
unsigned char const **r_q,
size_t *r_qlen);
gpg_error_t uncompress_ecc_q_in_canon_sexp (const unsigned char *keydata,
size_t keydatalen,
unsigned char **r_newkeydata,
size_t *r_newkeydatalen);
int get_pk_algo_from_key (gcry_sexp_t key);
int get_pk_algo_from_canon_sexp (const unsigned char *keydata,
size_t keydatalen);
char *pubkey_algo_string (gcry_sexp_t s_pkey, enum gcry_pk_algos *r_algoid);
const char *pubkey_algo_to_string (int algo);
const char *hash_algo_to_string (int algo);
const char *cipher_mode_to_string (int mode);
/*-- convert.c --*/
int hex2bin (const char *string, void *buffer, size_t length);
int hexcolon2bin (const char *string, void *buffer, size_t length);
char *bin2hex (const void *buffer, size_t length, char *stringbuf);
char *bin2hexcolon (const void *buffer, size_t length, char *stringbuf);
const char *hex2str (const char *hexstring,
char *buffer, size_t bufsize, size_t *buflen);
char *hex2str_alloc (const char *hexstring, size_t *r_count);
unsigned int hex2fixedbuf (const char *hexstr, void *buffer, size_t bufsize);
/*-- percent.c --*/
char *percent_plus_escape (const char *string);
char *percent_data_escape (int plus, const char *prefix,
const void *data, size_t datalen);
char *percent_plus_unescape (const char *string, int nulrepl);
char *percent_unescape (const char *string, int nulrepl);
size_t percent_plus_unescape_inplace (char *string, int nulrepl);
size_t percent_unescape_inplace (char *string, int nulrepl);
/*-- openpgp-oid.c --*/
gpg_error_t openpgp_oid_from_str (const char *string, gcry_mpi_t *r_mpi);
char *openpgp_oidbuf_to_str (const unsigned char *buf, size_t len);
char *openpgp_oid_to_str (gcry_mpi_t a);
int openpgp_oidbuf_is_ed25519 (const void *buf, size_t len);
int openpgp_oid_is_ed25519 (gcry_mpi_t a);
int openpgp_oidbuf_is_cv25519 (const void *buf, size_t len);
int openpgp_oid_is_cv25519 (gcry_mpi_t a);
int openpgp_oid_is_cv448 (gcry_mpi_t a);
int openpgp_oid_is_ed448 (gcry_mpi_t a);
const char *openpgp_curve_to_oid (const char *name,
unsigned int *r_nbits, int *r_algo);
const char *openpgp_oid_to_curve (const char *oid, int canon);
const char *openpgp_oid_or_name_to_curve (const char *oidname, int canon);
const char *openpgp_enum_curves (int *idxp);
const char *openpgp_is_curve_supported (const char *name,
int *r_algo, unsigned int *r_nbits);
const char *get_keyalgo_string (enum gcry_pk_algos algo,
unsigned int nbits, const char *curve);
/*-- homedir.c --*/
const char *standard_homedir (void);
const char *default_homedir (void);
void gnupg_set_homedir (const char *newdir);
void gnupg_maybe_make_homedir (const char *fname, int quiet);
const char *gnupg_homedir (void);
int gnupg_default_homedir_p (void);
const char *gnupg_daemon_rootdir (void);
const char *gnupg_socketdir (void);
const char *gnupg_sysconfdir (void);
const char *gnupg_bindir (void);
const char *gnupg_libexecdir (void);
const char *gnupg_libdir (void);
const char *gnupg_datadir (void);
const char *gnupg_localedir (void);
const char *gnupg_cachedir (void);
const char *gpg_agent_socket_name (void);
const char *dirmngr_socket_name (void);
const char *keyboxd_socket_name (void);
char *_gnupg_socketdir_internal (int skip_checks, unsigned *r_info);
/* All module names. We also include gpg and gpgsm for the sake for
gpgconf. */
#define GNUPG_MODULE_NAME_AGENT 1
#define GNUPG_MODULE_NAME_PINENTRY 2
#define GNUPG_MODULE_NAME_SCDAEMON 3
#define GNUPG_MODULE_NAME_DIRMNGR 4
#define GNUPG_MODULE_NAME_PROTECT_TOOL 5
#define GNUPG_MODULE_NAME_CHECK_PATTERN 6
#define GNUPG_MODULE_NAME_GPGSM 7
#define GNUPG_MODULE_NAME_GPG 8
#define GNUPG_MODULE_NAME_CONNECT_AGENT 9
#define GNUPG_MODULE_NAME_GPGCONF 10
#define GNUPG_MODULE_NAME_DIRMNGR_LDAP 11
#define GNUPG_MODULE_NAME_GPGV 12
#define GNUPG_MODULE_NAME_KEYBOXD 13
#define GNUPG_MODULE_NAME_TPM2DAEMON 14
const char *gnupg_module_name (int which);
void gnupg_module_name_flush_some (void);
void gnupg_set_builddir (const char *newdir);
/* A list of constants to identify protocols. This is used by tools
* which need to distinguish between the different protocols
* implemented by GnuPG. May be used as bit flags. */
#define GNUPG_PROTOCOL_OPENPGP 1 /* The one and only (gpg). */
#define GNUPG_PROTOCOL_CMS 2 /* The core of S/MIME (gpgsm) */
#define GNUPG_PROTOCOL_SSH_AGENT 4 /* Out ssh-agent implementation */
/*-- gpgrlhelp.c --*/
void gnupg_rl_initialize (void);
/*-- helpfile.c --*/
char *gnupg_get_help_string (const char *key, int only_current_locale);
/*-- localename.c --*/
const char *gnupg_messages_locale_name (void);
/*-- miscellaneous.c --*/
/* This function is called at startup to tell libgcrypt to use our own
logging subsystem. */
void setup_libgcrypt_logging (void);
/* Print an out of core message and die. */
void xoutofcore (void);
/* Wrapper aroung gpgrt_reallocarray. Uses the gpgrt alloc function
* which are redirect to the Libgcrypt versions via
* init_common_subsystems. Thus they can be used interchangeable with
* the other alloc functions. */
void *xreallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size);
/* Same as estream_asprintf but die on memory failure. */
char *xasprintf (const char *fmt, ...) GPGRT_ATTR_PRINTF(1,2);
/* This is now an alias to estream_asprintf. */
char *xtryasprintf (const char *fmt, ...) GPGRT_ATTR_PRINTF(1,2);
/* Replacement for gcry_cipher_algo_name. */
const char *gnupg_cipher_algo_name (int algo);
void obsolete_option (const char *configname, unsigned int configlineno,
const char *name);
const char *print_fname_stdout (const char *s);
const char *print_fname_stdin (const char *s);
void print_utf8_buffer3 (estream_t fp, const void *p, size_t n,
const char *delim);
void print_utf8_buffer2 (estream_t fp, const void *p, size_t n, int delim);
void print_utf8_buffer (estream_t fp, const void *p, size_t n);
void print_utf8_string (estream_t stream, const char *p);
void print_hexstring (FILE *fp, const void *buffer, size_t length,
int reserved);
char *try_make_printable_string (const void *p, size_t n, int delim);
char *make_printable_string (const void *p, size_t n, int delim);
char *decode_c_string (const char *src);
int is_file_compressed (const char *s, int *ret_rc);
int match_multistr (const char *multistr,const char *match);
int gnupg_compare_version (const char *a, const char *b);
struct debug_flags_s
{
unsigned int flag;
const char *name;
};
int parse_debug_flag (const char *string, unsigned int *debugvar,
const struct debug_flags_s *flags);
/*-- Simple replacement functions. */
/* We use the gnupg_ttyname macro to be safe not to run into conflicts
which an extisting but broken ttyname. */
#if !defined(HAVE_TTYNAME) || defined(HAVE_BROKEN_TTYNAME)
# define gnupg_ttyname(n) _gnupg_ttyname ((n))
/* Systems without ttyname (W32) will merely return NULL. */
static inline char *
_gnupg_ttyname (int fd)
{
(void)fd;
return NULL;
}
#else /*HAVE_TTYNAME*/
# define gnupg_ttyname(n) ttyname ((n))
#endif /*HAVE_TTYNAME */
#ifdef HAVE_W32CE_SYSTEM
#define getpid() GetCurrentProcessId ()
char *_gnupg_getenv (const char *name); /* See sysutils.c */
#define getenv(a) _gnupg_getenv ((a))
char *_gnupg_setenv (const char *name); /* See sysutils.c */
#define setenv(a,b,c) _gnupg_setenv ((a),(b),(c))
int _gnupg_isatty (int fd);
#define gnupg_isatty(a) _gnupg_isatty ((a))
#else
#define gnupg_isatty(a) isatty ((a))
#endif
/*-- Macros to replace ctype ones to avoid locale problems. --*/
#define spacep(p) (*(p) == ' ' || *(p) == '\t')
#define digitp(p) (*(p) >= '0' && *(p) <= '9')
#define alphap(p) ((*(p) >= 'A' && *(p) <= 'Z') \
|| (*(p) >= 'a' && *(p) <= 'z'))
#define alnump(p) (alphap (p) || digitp (p))
#define hexdigitp(a) (digitp (a) \
|| (*(a) >= 'A' && *(a) <= 'F') \
|| (*(a) >= 'a' && *(a) <= 'f'))
/* Note this isn't identical to a C locale isspace() without \f and
\v, but works for the purposes used here. */
#define ascii_isspace(a) ((a)==' ' || (a)=='\n' || (a)=='\r' || (a)=='\t')
/* The atoi macros assume that the buffer has only valid digits. */
#define atoi_1(p) (*(p) - '0' )
#define atoi_2(p) ((atoi_1(p) * 10) + atoi_1((p)+1))
#define atoi_4(p) ((atoi_2(p) * 100) + atoi_2((p)+2))
#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \
*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
#define xtoi_4(p) ((xtoi_2(p) * 256) + xtoi_2((p)+2))
#endif /*GNUPG_COMMON_UTIL_H*/
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