g10/packet.h

   1 /* packet.h - packet definitions
   2  * Copyright (C) 1998, 1999, 2000, 2001, 2002,
   3  *               2003  Free Software Foundation, Inc.
   4  *
   5  * This file is part of GnuPG.
   6  *
   7  * GnuPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GnuPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  20  */
  21
  22 #ifndef G10_PACKET_H
  23 #define G10_PACKET_H
  24
  25 #include "gpg.h"
  26 #include <gcrypt.h>
  27
  28 #include "types.h"
  29 #include "../common/iobuf.h"
  30 #include "../jnlib/strlist.h"
  31 #include "cipher.h"
  32 #include "filter.h"
  33 #include "global.h"
  34
  35 #define DEBUG_PARSE_PACKET 1
  36
  37 typedef enum {
  38         PKT_NONE           =0,
  39         PKT_PUBKEY_ENC     =1, /* public key encrypted packet */
  40         PKT_SIGNATURE      =2, /* secret key encrypted packet */
  41         PKT_SYMKEY_ENC     =3, /* session key packet (OpenPGP)*/
  42         PKT_ONEPASS_SIG    =4, /* one pass sig packet (OpenPGP)*/
  43         PKT_SECRET_KEY     =5, /* secret key */
  44         PKT_PUBLIC_KEY     =6, /* public key */
  45         PKT_SECRET_SUBKEY  =7, /* secret subkey (OpenPGP) */
  46         PKT_COMPRESSED     =8, /* compressed data packet */
  47         PKT_ENCRYPTED      =9, /* conventional encrypted data */
  48         PKT_MARKER        =10, /* marker packet (OpenPGP) */
  49         PKT_PLAINTEXT     =11, /* plaintext data with filename and mode */
  50         PKT_RING_TRUST    =12, /* keyring trust packet */
  51         PKT_USER_ID       =13, /* user id packet */
  52         PKT_PUBLIC_SUBKEY =14, /* public subkey (OpenPGP) */
  53         PKT_OLD_COMMENT   =16, /* comment packet from an OpenPGP draft */
  54         PKT_ATTRIBUTE     =17, /* PGP's attribute packet */
  55         PKT_ENCRYPTED_MDC =18, /* integrity protected encrypted data */
  56         PKT_MDC           =19, /* manipulation detection code packet */
  57         PKT_COMMENT       =61, /* new comment packet (private) */
  58         PKT_GPG_CONTROL   =63  /* internal control packet */
  59 } pkttype_t;
  60
  61 typedef struct packet_struct PACKET;
  62
  63 /* PKT_GPG_CONTROL types */
  64 typedef enum {
  65     CTRLPKT_CLEARSIGN_START = 1,
  66     CTRLPKT_PIPEMODE = 2,
  67     CTRLPKT_PLAINTEXT_MARK =3
  68 } ctrlpkttype_t;
  69
  70 typedef enum {
  71     PREFTYPE_NONE = 0,
  72     PREFTYPE_SYM = 1,
  73     PREFTYPE_HASH = 2,
  74     PREFTYPE_ZIP = 3
  75 } preftype_t;
  76
  77 typedef struct {
  78     byte type;
  79     byte value;
  80 } prefitem_t;
  81
  82 typedef struct {
  83     int  mode;
  84     byte hash_algo;
  85     byte salt[8];
  86     u32  count;
  87 } STRING2KEY;
  88
  89 typedef struct {
  90     byte version;
  91     byte cipher_algo;    /* cipher algorithm used */
  92     STRING2KEY s2k;
  93     byte seskeylen;   /* keylength in byte or 0 for no seskey */
  94     byte seskey[1];
  95 } PKT_symkey_enc;
  96
  97 typedef struct {
  98     u32     keyid[2];       /* 64 bit keyid */
  99     byte    version;
 100     byte    pubkey_algo;    /* algorithm used for public key scheme */
 101     byte    throw_keyid;
 102     gcry_mpi_t     data[PUBKEY_MAX_NENC];
 103 } PKT_pubkey_enc;
 104
 105
 106 typedef struct {
 107     u32     keyid[2];       /* 64 bit keyid */
 108     byte    sig_class;      /* sig classification */
 109     byte    digest_algo;    /* algorithm used for digest */
 110     byte    pubkey_algo;    /* algorithm used for public key scheme */
 111     byte    last;           /* a stupid flag */
 112 } PKT_onepass_sig;
 113
 114
 115 typedef struct {
 116     size_t size;  /* allocated */
 117     size_t len;   /* used */
 118     byte data[1];
 119 } subpktarea_t;
 120
 121 struct revocation_key {
 122   byte class;
 123   byte algid;
 124   byte fpr[MAX_FINGERPRINT_LEN];
 125 };
 126
 127 typedef struct {
 128     ulong   local_id;       /* internal use, valid if > 0 */
 129     struct {
 130         unsigned checked:1; /* signature has been checked */
 131         unsigned valid:1;   /* signature is good (if checked is set) */
 132         unsigned unknown_critical:1;
 133         unsigned exportable:1;
 134         unsigned revocable:1;
 135         unsigned policy_url:1; /* At least one policy URL is present */
 136         unsigned notation:1;   /* At least one notation is present */
 137         unsigned pref_ks:1;    /* At least one preferred keyserver is present */
 138         unsigned expired:1;
 139     } flags;
 140     u32     keyid[2];       /* 64 bit keyid */
 141     u32     timestamp;      /* signature made */
 142     u32     expiredate;     /* expires at this date or 0 if not at all */
 143     byte    version;
 144     byte    sig_class;      /* sig classification, append for MD calculation*/
 145     byte    pubkey_algo;    /* algorithm used for public key scheme */
 146                             /* (PUBKEY_ALGO_xxx) */
 147     byte    digest_algo;    /* algorithm used for digest (DIGEST_ALGO_xxxx) */
 148     byte    trust_depth;
 149     byte    trust_value;
 150     const byte *trust_regexp;
 151     struct revocation_key **revkey;
 152     int numrevkeys;
 153     subpktarea_t *hashed;    /* all subpackets with hashed  data (v4 only) */
 154     subpktarea_t *unhashed;  /* ditto for unhashed data */
 155     byte digest_start[2];   /* first 2 bytes of the digest */
 156     gcry_mpi_t  data[PUBKEY_MAX_NSIG];
 157 } PKT_signature;
 158
 159 #define ATTRIB_IMAGE 1
 160
 161 /* This is the cooked form of attributes */
 162 struct user_attribute {
 163   byte type;
 164   const byte *data;
 165   u32 len;
 166 };
 167
 168 typedef struct {
 169     int ref;              /* reference counter */
 170     int len;              /* length of the name */
 171     struct user_attribute *attribs;
 172     int numattribs;
 173     byte *attrib_data;    /* if this is not NULL, the packet is an attribute */
 174     unsigned long attrib_len;
 175     byte *namehash;
 176     int help_key_usage;
 177     u32 help_key_expire;
 178     int help_full_count;
 179     int help_marginal_count;
 180     int is_primary;       /* 2 if set via the primary flag, 1 if calculated */
 181     int is_revoked;
 182     int is_expired;
 183     u32 expiredate;       /* expires at this date or 0 if not at all */
 184     prefitem_t *prefs;    /* list of preferences (may be NULL)*/
 185     int mdc_feature;
 186     int ks_modify;
 187     u32 created;          /* according to the self-signature */
 188     byte selfsigversion;
 189     char name[1];
 190 } PKT_user_id;
 191
 192
 193 /****************
 194  * Note about the pkey/skey elements:  We assume that the secret keys
 195  * has the same elemts as the public key at the begin of the array, so
 196  * that npkey < nskey and it is possible to compare the secret and
 197  * public keys by comparing the first npkey elements of pkey against skey.
 198  */
 199 typedef struct {
 200     u32     timestamp;      /* key made */
 201     u32     expiredate;     /* expires at this date or 0 if not at all */
 202     u32     max_expiredate; /* must not expire past this date */
 203     byte    hdrbytes;       /* number of header bytes */
 204     byte    version;
 205     byte    selfsigversion; /* highest version of all of the self-sigs */
 206     byte    pubkey_algo;    /* algorithm used for public key scheme */
 207     byte    pubkey_usage;   /* for now only used to pass it to getkey() */
 208     byte    req_usage;      /* hack to pass a request to getkey() */
 209     byte    req_algo;       /* Ditto */
 210     u32     has_expired;    /* set to the expiration date if expired */
 211     int     is_revoked;     /* key has been revoked */
 212     int     is_valid;       /* key (especially subkey) is valid */
 213     int     dont_cache;     /* do not cache this */
 214     ulong   local_id;       /* internal use, valid if > 0 */
 215     u32     main_keyid[2];  /* keyid of the primary key */
 216     u32     keyid[2];       /* calculated by keyid_from_pk() */
 217     byte    is_primary;
 218     byte    is_disabled;    /* 0 for unset, 1 for enabled, 2 for disabled. */
 219     prefitem_t *prefs;      /* list of preferences (may be NULL) */
 220     int     mdc_feature;    /* mdc feature set */
 221     PKT_user_id *user_id;   /* if != NULL: found by that uid */
 222     struct revocation_key *revkey;
 223     int     numrevkeys;
 224     u32     trust_timestamp;
 225     byte    trust_depth;
 226     byte    trust_value;
 227     const byte *trust_regexp;
 228     gcry_mpi_t     pkey[PUBKEY_MAX_NPKEY];
 229 } PKT_public_key;
 230
 231 /* Evaluates as true if the pk is disabled, and false if it isn't.  If
 232    there is no disable value cached, fill one in. */
 233 #define pk_is_disabled(a) (((a)->is_disabled)?((a)->is_disabled==2):(cache_disabled_value((a))))
 234
 235 typedef struct {
 236     u32     timestamp;      /* key made */
 237     u32     expiredate;     /* expires at this date or 0 if not at all */
 238     u32     max_expiredate; /* must not expire past this date */
 239     byte    hdrbytes;       /* number of header bytes */
 240     byte    version;
 241     byte    pubkey_algo;    /* algorithm used for public key scheme */
 242     byte    pubkey_usage;
 243     byte    req_usage;
 244     byte    req_algo;
 245     u32     has_expired;    /* set to the expiration date if expired */
 246     int     is_revoked;     /* key has been revoked */
 247     int     is_valid;       /* key (especially subkey) is valid */
 248     u32     main_keyid[2];  /* keyid of the primary key */
 249     u32     keyid[2];
 250     byte is_primary;
 251     byte is_protected;  /* The secret info is protected and must */
 252                         /* be decrypted before use, the protected */
 253                         /* MPIs are simply (void*) pointers to memory */
 254                         /* and should never be passed to a mpi_xxx() */
 255     struct {
 256         byte algo;  /* cipher used to protect the secret information*/
 257         byte sha1chk;  /* SHA1 is used instead of a 16 bit checksum */
 258         STRING2KEY s2k;
 259         byte ivlen;  /* used length of the iv */
 260         byte iv[16]; /* initialization vector for CFB mode */
 261     } protect;
 262     gcry_mpi_t skey[PUBKEY_MAX_NSKEY];
 263     u16 csum;           /* checksum */
 264 } PKT_secret_key;
 265
 266
 267 typedef struct {
 268     int  len;             /* length of data */
 269     char data[1];
 270 } PKT_comment;
 271
 272 typedef struct {
 273     u32  len;             /* reserved */
 274     byte  new_ctb;
 275     byte  algorithm;
 276     iobuf_t buf;                  /* iobuf_t reference */
 277 } PKT_compressed;
 278
 279 typedef struct {
 280     u32  len;             /* length of encrypted data */
 281     int  extralen;        /* this is (blocksize+2) */
 282     byte new_ctb;         /* uses a new CTB */
 283     byte mdc_method;      /* > 0: integrity protected encrypted data packet */
 284     iobuf_t buf;                  /* iobuf_t reference */
 285 } PKT_encrypted;
 286
 287 typedef struct {
 288     byte hash[20];
 289 } PKT_mdc;
 290
 291 typedef struct {
 292     unsigned int trustval;
 293     unsigned int sigcache;
 294 } PKT_ring_trust;
 295
 296 typedef struct {
 297     u32  len;             /* length of encrypted data */
 298     iobuf_t buf;                  /* iobuf_t reference */
 299     byte new_ctb;
 300     byte is_partial;      /* partial length encoded */
 301     int mode;
 302     u32 timestamp;
 303     int  namelen;
 304     char name[1];
 305 } PKT_plaintext;
 306
 307 typedef struct {
 308     int  control;
 309     size_t datalen;
 310     char data[1];
 311 } PKT_gpg_control;
 312
 313 /* combine all packets into a union */
 314 struct packet_struct {
 315     pkttype_t pkttype;
 316     union {
 317         void *generic;
 318         PKT_symkey_enc  *symkey_enc;    /* PKT_SYMKEY_ENC */
 319         PKT_pubkey_enc  *pubkey_enc;    /* PKT_PUBKEY_ENC */
 320         PKT_onepass_sig *onepass_sig;   /* PKT_ONEPASS_SIG */
 321         PKT_signature   *signature;     /* PKT_SIGNATURE */
 322         PKT_public_key  *public_key;    /* PKT_PUBLIC_[SUB)KEY */
 323         PKT_secret_key  *secret_key;    /* PKT_SECRET_[SUB]KEY */
 324         PKT_comment     *comment;       /* PKT_COMMENT */
 325         PKT_user_id     *user_id;       /* PKT_USER_ID */
 326         PKT_compressed  *compressed;    /* PKT_COMPRESSED */
 327         PKT_encrypted   *encrypted;     /* PKT_ENCRYPTED[_MDC] */
 328         PKT_mdc         *mdc;           /* PKT_MDC */
 329         PKT_ring_trust  *ring_trust;    /* PKT_RING_TRUST */
 330         PKT_plaintext   *plaintext;     /* PKT_PLAINTEXT */
 331         PKT_gpg_control *gpg_control;   /* PKT_GPG_CONTROL */
 332     } pkt;
 333 };
 334
 335 #define init_packet(a) do { (a)->pkttype = 0;           \
 336                             (a)->pkt.generic = NULL;    \
 337                        } while(0)
 338
 339 typedef enum {
 340     SIGSUBPKT_TEST_CRITICAL=-3,
 341     SIGSUBPKT_LIST_UNHASHED=-2,
 342     SIGSUBPKT_LIST_HASHED  =-1,
 343     SIGSUBPKT_NONE         = 0,
 344     SIGSUBPKT_SIG_CREATED  = 2, /* signature creation time */
 345     SIGSUBPKT_SIG_EXPIRE   = 3, /* signature expiration time */
 346     SIGSUBPKT_EXPORTABLE   = 4, /* exportable */
 347     SIGSUBPKT_TRUST        = 5, /* trust signature */
 348     SIGSUBPKT_REGEXP       = 6, /* regular expression */
 349     SIGSUBPKT_REVOCABLE    = 7, /* revocable */
 350     SIGSUBPKT_KEY_EXPIRE   = 9, /* key expiration time */
 351     SIGSUBPKT_ARR          =10, /* additional recipient request */
 352     SIGSUBPKT_PREF_SYM     =11, /* preferred symmetric algorithms */
 353     SIGSUBPKT_REV_KEY      =12, /* revocation key */
 354     SIGSUBPKT_ISSUER       =16, /* issuer key ID */
 355     SIGSUBPKT_NOTATION     =20, /* notation data */
 356     SIGSUBPKT_PREF_HASH    =21, /* preferred hash algorithms */
 357     SIGSUBPKT_PREF_COMPR   =22, /* preferred compression algorithms */
 358     SIGSUBPKT_KS_FLAGS     =23, /* key server preferences */
 359     SIGSUBPKT_PREF_KS      =24, /* preferred key server */
 360     SIGSUBPKT_PRIMARY_UID  =25, /* primary user id */
 361     SIGSUBPKT_POLICY       =26, /* policy URL */
 362     SIGSUBPKT_KEY_FLAGS    =27, /* key flags */
 363     SIGSUBPKT_SIGNERS_UID  =28, /* signer's user id */
 364     SIGSUBPKT_REVOC_REASON =29, /* reason for revocation */
 365     SIGSUBPKT_FEATURES     =30, /* feature flags */
 366
 367     SIGSUBPKT_FLAG_CRITICAL=128
 368 } sigsubpkttype_t;
 369
 370
 371 /*-- mainproc.c --*/
 372 int proc_packets( void *ctx, iobuf_t a );
 373 int proc_signature_packets( void *ctx, iobuf_t a,
 374                             STRLIST signedfiles, const char *sigfile );
 375 int proc_encryption_packets( void *ctx, iobuf_t a );
 376 int list_packets( iobuf_t a );
 377
 378 /*-- parse-packet.c --*/
 379 int set_packet_list_mode( int mode );
 380
 381 #if DEBUG_PARSE_PACKET
 382 int dbg_search_packet( iobuf_t inp, PACKET *pkt, off_t *retpos, int with_uid,
 383                        const char* file, int lineno  );
 384 int dbg_parse_packet( iobuf_t inp, PACKET *ret_pkt,
 385                       const char* file, int lineno );
 386 int dbg_copy_all_packets( iobuf_t inp, iobuf_t out,
 387                           const char* file, int lineno  );
 388 int dbg_copy_some_packets( iobuf_t inp, iobuf_t out, off_t stopoff,
 389                            const char* file, int lineno  );
 390 int dbg_skip_some_packets( iobuf_t inp, unsigned n,
 391                            const char* file, int lineno );
 392 #define search_packet( a,b,c,d )   \
 393              dbg_search_packet( (a), (b), (c), (d), __FILE__, __LINE__ )
 394 #define parse_packet( a, b )  \
 395              dbg_parse_packet( (a), (b), __FILE__, __LINE__ )
 396 #define copy_all_packets( a,b )  \
 397              dbg_copy_all_packets((a),(b), __FILE__, __LINE__ )
 398 #define copy_some_packets( a,b,c ) \
 399              dbg_copy_some_packets((a),(b),(c), __FILE__, __LINE__ )
 400 #define skip_some_packets( a,b ) \
 401              dbg_skip_some_packets((a),(b), __FILE__, __LINE__ )
 402 #else
 403 int search_packet( iobuf_t inp, PACKET *pkt, off_t *retpos, int with_uid );
 404 int parse_packet( iobuf_t inp, PACKET *ret_pkt);
 405 int copy_all_packets( iobuf_t inp, iobuf_t out );
 406 int copy_some_packets( iobuf_t inp, iobuf_t out, off_t stopoff );
 407 int skip_some_packets( iobuf_t inp, unsigned n );
 408 #endif
 409
 410 const byte *enum_sig_subpkt ( const subpktarea_t *subpkts,
 411                               sigsubpkttype_t reqtype,
 412                               size_t *ret_n, int *start, int *critical );
 413 const byte *parse_sig_subpkt ( const subpktarea_t *buffer,
 414                                sigsubpkttype_t reqtype,
 415                                size_t *ret_n );
 416 const byte *parse_sig_subpkt2 ( PKT_signature *sig,
 417                                 sigsubpkttype_t reqtype,
 418                                 size_t *ret_n );
 419 int parse_one_sig_subpkt( const byte *buffer, size_t n, int type );
 420 void parse_revkeys(PKT_signature *sig);
 421 int parse_attribute_subpkts(PKT_user_id *uid);
 422 void make_attribute_uidname(PKT_user_id *uid, size_t max_namelen);
 423 PACKET *create_gpg_control ( ctrlpkttype_t type,
 424                              const byte *data,
 425                              size_t datalen );
 426
 427 /*-- build-packet.c --*/
 428 int build_packet( iobuf_t inp, PACKET *pkt );
 429 u32 calc_packet_length( PACKET *pkt );
 430 void hash_public_key( MD_HANDLE md, PKT_public_key *pk );
 431 void build_sig_subpkt( PKT_signature *sig, sigsubpkttype_t type,
 432                         const byte *buffer, size_t buflen );
 433 void build_sig_subpkt_from_sig( PKT_signature *sig );
 434 int  delete_sig_subpkt(subpktarea_t *buffer, sigsubpkttype_t type );
 435 void build_attribute_subpkt(PKT_user_id *uid,byte type,
 436                             const void *buf,u32 buflen,
 437                             const void *header,u32 headerlen);
 438
 439 /*-- free-packet.c --*/
 440 void free_symkey_enc( PKT_symkey_enc *enc );
 441 void free_pubkey_enc( PKT_pubkey_enc *enc );
 442 void free_seckey_enc( PKT_signature *enc );
 443 int  digest_algo_from_sig( PKT_signature *sig );
 444 void release_public_key_parts( PKT_public_key *pk );
 445 void free_public_key( PKT_public_key *key );
 446 void release_secret_key_parts( PKT_secret_key *sk );
 447 void free_secret_key( PKT_secret_key *sk );
 448 void free_attributes(PKT_user_id *uid);
 449 void free_user_id( PKT_user_id *uid );
 450 void free_comment( PKT_comment *rem );
 451 void free_packet( PACKET *pkt );
 452 prefitem_t *copy_prefs (const prefitem_t *prefs);
 453 PKT_public_key *copy_public_key( PKT_public_key *d, PKT_public_key *s );
 454 void copy_public_parts_to_secret_key( PKT_public_key *pk, PKT_secret_key *sk );
 455 PKT_secret_key *copy_secret_key( PKT_secret_key *d, PKT_secret_key *s );
 456 PKT_signature *copy_signature( PKT_signature *d, PKT_signature *s );
 457 PKT_user_id *scopy_user_id (PKT_user_id *sd );
 458 int cmp_public_keys( PKT_public_key *a, PKT_public_key *b );
 459 int cmp_secret_keys( PKT_secret_key *a, PKT_secret_key *b );
 460 int cmp_signatures( PKT_signature *a, PKT_signature *b );
 461 int cmp_public_secret_key( PKT_public_key *pk, PKT_secret_key *sk );
 462 int cmp_user_ids( PKT_user_id *a, PKT_user_id *b );
 463
 464
 465 /*-- sig-check.c --*/
 466 int signature_check( PKT_signature *sig, MD_HANDLE digest );
 467 int signature_check2( PKT_signature *sig, MD_HANDLE digest, u32 *r_expiredate,
 468                       int *r_expired, int *r_revoked, PKT_public_key *ret_pk );
 469
 470 /*-- seckey-cert.c --*/
 471 int is_secret_key_protected( PKT_secret_key *sk );
 472 int check_secret_key( PKT_secret_key *sk, int retries );
 473 int protect_secret_key( PKT_secret_key *sk, DEK *dek );
 474
 475 /*-- pubkey-enc.c --*/
 476 int get_session_key( PKT_pubkey_enc *k, DEK *dek );
 477 int get_override_session_key( DEK *dek, const char *string );
 478
 479 /*-- compress.c --*/
 480 int handle_compressed( void *ctx, PKT_compressed *cd,
 481                        int (*callback)(iobuf_t, void *), void *passthru );
 482
 483 /*-- encr-data.c --*/
 484 int decrypt_data( void *ctx, PKT_encrypted *ed, DEK *dek );
 485
 486 /*-- plaintext.c --*/
 487 int handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
 488                       int nooutput, int clearsig, int *create_failed );
 489 int ask_for_detached_datafile( MD_HANDLE md, MD_HANDLE md2,
 490                                const char *inname, int textmode );
 491
 492 /*-- comment.c --*/
 493 int write_comment( iobuf_t out, const char *s );
 494
 495 /*-- sign.c --*/
 496 int make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
 497                         PKT_user_id *uid, PKT_public_key *subpk,
 498                         PKT_secret_key *sk, int sigclass, int digest_algo,
 499                         int sigversion, u32 timestamp, u32 duration,
 500                         int (*mksubpkt)(PKT_signature *, void *),
 501                         void *opaque  );
 502 int update_keysig_packet( PKT_signature **ret_sig,
 503                       PKT_signature *orig_sig,
 504                       PKT_public_key *pk,
 505                       PKT_user_id *uid,
 506                       PKT_public_key *subpk,
 507                       PKT_secret_key *sk,
 508                       int (*mksubpkt)(PKT_signature *, void *),
 509                       void *opaque   );
 510
 511 /*-- keygen.c --*/
 512 PKT_user_id *generate_user_id(void);
 513
 514 #endif /*G10_PACKET_H*/