g10/keyid.c

   1 /* keyid.c - key ID and fingerprint handling
   2  * Copyright (C) 1998, 1999, 2000, 2001, 2003,
   3  *               2004, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20  * USA.
  21  */
  22
  23 #include <config.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <time.h>
  29 #include <assert.h>
  30
  31 #include "gpg.h"
  32 #include "util.h"
  33 #include "main.h"
  34 #include "packet.h"
  35 #include "options.h"
  36 #include "keydb.h"
  37 #include "i18n.h"
  38
  39 int
  40 pubkey_letter( int algo )
  41 {
  42     switch( algo ) {
  43       case PUBKEY_ALGO_RSA:     return 'R' ;
  44       case PUBKEY_ALGO_RSA_E:   return 'r' ;
  45       case PUBKEY_ALGO_RSA_S:   return 's' ;
  46       case PUBKEY_ALGO_ELGAMAL_E: return 'g';
  47       case PUBKEY_ALGO_ELGAMAL: return 'G' ;
  48       case PUBKEY_ALGO_DSA:     return 'D' ;
  49       default: return '?';
  50     }
  51 }
  52
  53 /* This function is useful for v4 fingerprints and v3 or v4 key
  54    signing. */
  55 void
  56 hash_public_key( gcry_md_hd_t md, PKT_public_key *pk )
  57 {
  58   unsigned int n = 6;
  59   unsigned int nn[PUBKEY_MAX_NPKEY];
  60   byte *pp[PUBKEY_MAX_NPKEY];
  61   int i;
  62   size_t nbits, nbytes;
  63   int npkey = pubkey_get_npkey (pk->pubkey_algo);
  64
  65   /* Two extra bytes for the expiration date in v3 */
  66   if(pk->version<4)
  67     n+=2;
  68
  69   if (npkey==0 && pk->pkey[0]
  70       && gcry_mpi_get_flag (pk->pkey[0], GCRYMPI_FLAG_OPAQUE))
  71     {
  72       pp[0] = gcry_mpi_get_opaque (pk->pkey[0], &nbits);
  73       nn[0] = (nbits+7)/8;
  74       n+=nn[0];
  75     }
  76   else
  77     for(i=0; i < npkey; i++ )
  78       {
  79         if (gcry_mpi_print (GCRYMPI_FMT_PGP, NULL, 0, &nbytes, pk->pkey[i]))
  80           BUG ();
  81         pp[i] = xmalloc (nbytes);
  82         if (gcry_mpi_print (GCRYMPI_FMT_PGP, pp[i], nbytes,
  83                             &nbytes, pk->pkey[i]))
  84           BUG ();
  85         nn[i] = nbytes;
  86         n += nn[i];
  87       }
  88
  89   gcry_md_putc ( md, 0x99 );     /* ctb */
  90   /* What does it mean if n is greater than than 0xFFFF ? */
  91   gcry_md_putc ( md, n >> 8 );   /* 2 byte length header */
  92   gcry_md_putc ( md, n );
  93   gcry_md_putc ( md, pk->version );
  94
  95   gcry_md_putc ( md, pk->timestamp >> 24 );
  96   gcry_md_putc ( md, pk->timestamp >> 16 );
  97   gcry_md_putc ( md, pk->timestamp >>  8 );
  98   gcry_md_putc ( md, pk->timestamp       );
  99
 100   if(pk->version<4)
 101     {
 102       u16 days=0;
 103       if(pk->expiredate)
 104         days=(u16)((pk->expiredate - pk->timestamp) / 86400L);
 105
 106       gcry_md_putc ( md, days >> 8 );
 107       gcry_md_putc ( md, days );
 108     }
 109
 110   gcry_md_putc ( md, pk->pubkey_algo );
 111
 112   if(npkey==0 && pk->pkey[0]
 113      && gcry_mpi_get_flag (pk->pkey[0], GCRYMPI_FLAG_OPAQUE))
 114     {
 115       gcry_md_write (md, pp[0], nn[0]);
 116     }
 117   else
 118     for(i=0; i < npkey; i++ )
 119       {
 120         gcry_md_write ( md, pp[i], nn[i] );
 121         xfree(pp[i]);
 122       }
 123 }
 124
 125 static gcry_md_hd_t
 126 do_fingerprint_md( PKT_public_key *pk )
 127 {
 128   gcry_md_hd_t md;
 129
 130   if (gcry_md_open (&md, DIGEST_ALGO_SHA1, 0))
 131     BUG ();
 132   hash_public_key(md,pk);
 133   gcry_md_final( md );
 134
 135   return md;
 136 }
 137
 138 static gcry_md_hd_t
 139 do_fingerprint_md_sk( PKT_secret_key *sk )
 140 {
 141     PKT_public_key pk;
 142     int npkey = pubkey_get_npkey( sk->pubkey_algo ); /* npkey is correct! */
 143     int i;
 144
 145     if(npkey==0)
 146       return NULL;
 147
 148     pk.pubkey_algo = sk->pubkey_algo;
 149     pk.version     = sk->version;
 150     pk.timestamp = sk->timestamp;
 151     pk.expiredate = sk->expiredate;
 152     pk.pubkey_algo = sk->pubkey_algo;
 153     for( i=0; i < npkey; i++ )
 154       pk.pkey[i] = sk->skey[i];
 155     return do_fingerprint_md( &pk );
 156 }
 157
 158
 159 u32
 160 v3_keyid (gcry_mpi_t a, u32 *ki)
 161 {
 162   byte *buffer;
 163   size_t nbytes;
 164
 165   if (gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0, &nbytes, a ))
 166     BUG ();
 167   /* fixme: allocate it on the stack */
 168   buffer = xmalloc (nbytes);
 169   if (gcry_mpi_print( GCRYMPI_FMT_USG, buffer, nbytes, NULL, a ))
 170     BUG ();
 171   if (nbytes < 8) /* oops */
 172     ki[0] = ki[1] = 0;
 173   else
 174     {
 175       memcpy (ki+0, buffer+nbytes-8, 4);
 176       memcpy (ki+1, buffer+nbytes-4, 4);
 177     }
 178   xfree (buffer);
 179   return ki[1];
 180 }
 181
 182
 183 size_t
 184 keystrlen(void)
 185 {
 186   switch(opt.keyid_format)
 187     {
 188     case KF_SHORT:
 189       return 8;
 190
 191     case KF_LONG:
 192       return 16;
 193
 194     case KF_0xSHORT:
 195       return 10;
 196
 197     case KF_0xLONG:
 198       return 18;
 199
 200     default:
 201       BUG();
 202     }
 203 }
 204
 205 const char *
 206 keystr(u32 *keyid)
 207 {
 208   static char keyid_str[19];
 209
 210   switch(opt.keyid_format)
 211     {
 212     case KF_SHORT:
 213       sprintf(keyid_str,"%08lX",(ulong)keyid[1]);
 214       break;
 215
 216     case KF_LONG:
 217       if(keyid[0])
 218         sprintf(keyid_str,"%08lX%08lX",(ulong)keyid[0],(ulong)keyid[1]);
 219       else
 220         sprintf(keyid_str,"%08lX",(ulong)keyid[1]);
 221       break;
 222
 223     case KF_0xSHORT:
 224       sprintf(keyid_str,"0x%08lX",(ulong)keyid[1]);
 225       break;
 226
 227     case KF_0xLONG:
 228       if(keyid[0])
 229         sprintf(keyid_str,"0x%08lX%08lX",(ulong)keyid[0],(ulong)keyid[1]);
 230       else
 231         sprintf(keyid_str,"0x%08lX",(ulong)keyid[1]);
 232       break;
 233
 234     default:
 235       BUG();
 236     }
 237
 238   return keyid_str;
 239 }
 240
 241 const char *
 242 keystr_from_pk(PKT_public_key *pk)
 243 {
 244   keyid_from_pk(pk,NULL);
 245
 246   return keystr(pk->keyid);
 247 }
 248
 249 const char *
 250 keystr_from_sk(PKT_secret_key *sk)
 251 {
 252   keyid_from_sk(sk,NULL);
 253
 254   return keystr(sk->keyid);
 255 }
 256
 257 const char *
 258 keystr_from_desc(KEYDB_SEARCH_DESC *desc)
 259 {
 260   switch(desc->mode)
 261     {
 262     case KEYDB_SEARCH_MODE_LONG_KID:
 263     case KEYDB_SEARCH_MODE_SHORT_KID:
 264       return keystr(desc->u.kid);
 265
 266     case KEYDB_SEARCH_MODE_FPR20:
 267       {
 268         u32 keyid[2];
 269
 270         keyid[0] = ((unsigned char)desc->u.fpr[12] << 24
 271                     | (unsigned char)desc->u.fpr[13] << 16
 272                     | (unsigned char)desc->u.fpr[14] << 8
 273                     | (unsigned char)desc->u.fpr[15]);
 274         keyid[1] = ((unsigned char)desc->u.fpr[16] << 24
 275                     | (unsigned char)desc->u.fpr[17] << 16
 276                     | (unsigned char)desc->u.fpr[18] << 8
 277                     | (unsigned char)desc->u.fpr[19]);
 278
 279         return keystr(keyid);
 280       }
 281
 282     case KEYDB_SEARCH_MODE_FPR16:
 283       return "?v3 fpr?";
 284
 285     default:
 286       BUG();
 287     }
 288 }
 289
 290 /****************
 291  * Get the keyid from the secret key and put it into keyid
 292  * if this is not NULL. Return the 32 low bits of the keyid.
 293  */
 294 u32
 295 keyid_from_sk( PKT_secret_key *sk, u32 *keyid )
 296 {
 297   u32 lowbits;
 298   u32 dummy_keyid[2];
 299
 300   if( !keyid )
 301     keyid = dummy_keyid;
 302
 303   if( sk->keyid[0] || sk->keyid[1] )
 304     {
 305       keyid[0] = sk->keyid[0];
 306       keyid[1] = sk->keyid[1];
 307       lowbits = keyid[1];
 308     }
 309   else if( sk->version < 4 )
 310     {
 311       if( is_RSA(sk->pubkey_algo) )
 312         {
 313           lowbits = (pubkey_get_npkey (sk->pubkey_algo) ?
 314                      v3_keyid( sk->skey[0], keyid ) : 0); /* Take n. */
 315           sk->keyid[0]=keyid[0];
 316           sk->keyid[1]=keyid[1];
 317         }
 318       else
 319         sk->keyid[0]=sk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
 320     }
 321   else
 322     {
 323       const byte *dp;
 324       gcry_md_hd_t md;
 325
 326       md = do_fingerprint_md_sk(sk);
 327       if(md)
 328         {
 329           dp = gcry_md_read (md, 0);
 330           keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
 331           keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
 332           lowbits = keyid[1];
 333           gcry_md_close (md);
 334           sk->keyid[0] = keyid[0];
 335           sk->keyid[1] = keyid[1];
 336         }
 337       else
 338         sk->keyid[0]=sk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
 339     }
 340
 341   return lowbits;
 342 }
 343
 344
 345 /****************
 346  * Get the keyid from the public key and put it into keyid
 347  * if this is not NULL. Return the 32 low bits of the keyid.
 348  */
 349 u32
 350 keyid_from_pk( PKT_public_key *pk, u32 *keyid )
 351 {
 352   u32 lowbits;
 353   u32 dummy_keyid[2];
 354
 355   if( !keyid )
 356     keyid = dummy_keyid;
 357
 358   if( pk->keyid[0] || pk->keyid[1] )
 359     {
 360       keyid[0] = pk->keyid[0];
 361       keyid[1] = pk->keyid[1];
 362       lowbits = keyid[1];
 363     }
 364   else if( pk->version < 4 )
 365     {
 366       if( is_RSA(pk->pubkey_algo) )
 367         {
 368           lowbits = (pubkey_get_npkey (pk->pubkey_algo) ?
 369                      v3_keyid ( pk->pkey[0], keyid ) : 0); /* From n. */
 370           pk->keyid[0] = keyid[0];
 371           pk->keyid[1] = keyid[1];
 372         }
 373       else
 374         pk->keyid[0]=pk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
 375     }
 376   else
 377     {
 378       const byte *dp;
 379       gcry_md_hd_t md;
 380
 381       md = do_fingerprint_md(pk);
 382       if(md)
 383         {
 384           dp = gcry_md_read ( md, 0 );
 385           keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
 386           keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
 387           lowbits = keyid[1];
 388           gcry_md_close (md);
 389           pk->keyid[0] = keyid[0];
 390           pk->keyid[1] = keyid[1];
 391         }
 392       else
 393         pk->keyid[0]=pk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
 394     }
 395
 396   return lowbits;
 397 }
 398
 399
 400 /****************
 401  * Get the keyid from the fingerprint.  This function is simple for most
 402  * keys, but has to do a keylookup for old stayle keys.
 403  */
 404 u32
 405 keyid_from_fingerprint( const byte *fprint, size_t fprint_len, u32 *keyid )
 406 {
 407     u32 dummy_keyid[2];
 408
 409     if( !keyid )
 410         keyid = dummy_keyid;
 411
 412     if( fprint_len != 20 ) {
 413         /* This is special as we have to lookup the key first */
 414         PKT_public_key pk;
 415         int rc;
 416
 417         memset( &pk, 0, sizeof pk );
 418         rc = get_pubkey_byfprint( &pk, fprint, fprint_len );
 419         if( rc ) {
 420             log_error("Oops: keyid_from_fingerprint: no pubkey\n");
 421             keyid[0] = 0;
 422             keyid[1] = 0;
 423         }
 424         else
 425             keyid_from_pk( &pk, keyid );
 426     }
 427     else {
 428         const byte *dp = fprint;
 429         keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
 430         keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
 431     }
 432
 433     return keyid[1];
 434 }
 435
 436
 437 u32
 438 keyid_from_sig( PKT_signature *sig, u32 *keyid )
 439 {
 440     if( keyid ) {
 441         keyid[0] = sig->keyid[0];
 442         keyid[1] = sig->keyid[1];
 443     }
 444     return sig->keyid[1];
 445 }
 446
 447 byte *
 448 namehash_from_uid(PKT_user_id *uid)
 449 {
 450   if(uid->namehash==NULL)
 451     {
 452       uid->namehash = xmalloc(20);
 453
 454       if(uid->attrib_data)
 455         gcry_md_hash_buffer (GCRY_MD_RMD160, uid->namehash,
 456                              uid->attrib_data, uid->attrib_len);
 457       else
 458         gcry_md_hash_buffer (GCRY_MD_RMD160, uid->namehash,
 459                              uid->name, uid->len);
 460     }
 461
 462   return uid->namehash;
 463 }
 464
 465 /****************
 466  * return the number of bits used in the pk
 467  */
 468 unsigned
 469 nbits_from_pk( PKT_public_key *pk )
 470 {
 471     return pubkey_nbits( pk->pubkey_algo, pk->pkey );
 472 }
 473
 474 /****************
 475  * return the number of bits used in the sk
 476  */
 477 unsigned
 478 nbits_from_sk( PKT_secret_key *sk )
 479 {
 480     return pubkey_nbits( sk->pubkey_algo, sk->skey );
 481 }
 482
 483 static const char *
 484 mk_datestr (char *buffer, time_t atime)
 485 {
 486     struct tm *tp;
 487
 488     if ( atime < 0 ) /* 32 bit time_t and after 2038-01-19 */
 489         strcpy (buffer, "????" "-??" "-??"); /* mark this as invalid */
 490     else {
 491         tp = gmtime (&atime);
 492         sprintf (buffer,"%04d-%02d-%02d",
 493                  1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
 494     }
 495     return buffer;
 496 }
 497
 498 /****************
 499  * return a string with the creation date of the pk
 500  * Note: this is alloced in a static buffer.
 501  *    Format is: yyyy-mm-dd
 502  */
 503 const char *
 504 datestr_from_pk( PKT_public_key *pk )
 505 {
 506     static char buffer[11+5];
 507     time_t atime = pk->timestamp;
 508
 509     return mk_datestr (buffer, atime);
 510 }
 511
 512 const char *
 513 datestr_from_sk( PKT_secret_key *sk )
 514 {
 515     static char buffer[11+5];
 516     time_t atime = sk->timestamp;
 517
 518     return mk_datestr (buffer, atime);
 519 }
 520
 521 const char *
 522 datestr_from_sig( PKT_signature *sig )
 523 {
 524     static char buffer[11+5];
 525     time_t atime = sig->timestamp;
 526
 527     return mk_datestr (buffer, atime);
 528 }
 529
 530 const char *
 531 expirestr_from_pk( PKT_public_key *pk )
 532 {
 533     static char buffer[11+5];
 534     time_t atime;
 535
 536     if( !pk->expiredate )
 537         return _("never     ");
 538     atime = pk->expiredate;
 539     return mk_datestr (buffer, atime);
 540 }
 541
 542 const char *
 543 expirestr_from_sk( PKT_secret_key *sk )
 544 {
 545     static char buffer[11+5];
 546     time_t atime;
 547
 548     if( !sk->expiredate )
 549         return _("never     ");
 550     atime = sk->expiredate;
 551     return mk_datestr (buffer, atime);
 552 }
 553
 554 const char *
 555 expirestr_from_sig( PKT_signature *sig )
 556 {
 557     static char buffer[11+5];
 558     time_t atime;
 559
 560     if(!sig->expiredate)
 561       return _("never     ");
 562     atime=sig->expiredate;
 563     return mk_datestr (buffer, atime);
 564 }
 565
 566 const char *
 567 revokestr_from_pk( PKT_public_key *pk )
 568 {
 569     static char buffer[11+5];
 570     time_t atime;
 571
 572     if(!pk->revoked.date)
 573       return _("never     ");
 574     atime=pk->revoked.date;
 575     return mk_datestr (buffer, atime);
 576 }
 577
 578
 579 const char *
 580 usagestr_from_pk( PKT_public_key *pk )
 581 {
 582   static char buffer[10];
 583   int i = 0;
 584   unsigned int use = pk->pubkey_usage;
 585
 586   if ( use & PUBKEY_USAGE_SIG )
 587     buffer[i++] = 'S';
 588
 589   if ( use & PUBKEY_USAGE_CERT )
 590     buffer[i++] = 'C';
 591
 592   if ( use & PUBKEY_USAGE_ENC )
 593     buffer[i++] = 'E';
 594
 595   if ( (use & PUBKEY_USAGE_AUTH) )
 596     buffer[i++] = 'A';
 597
 598   while (i < 4)
 599     buffer[i++] = ' ';
 600
 601   buffer[i] = 0;
 602   return buffer;
 603 }
 604
 605
 606 const char *
 607 colon_strtime (u32 t)
 608 {
 609     if (!t)
 610         return "";
 611     if (opt.fixed_list_mode) {
 612         static char buf[15];
 613         sprintf (buf, "%lu", (ulong)t);
 614         return buf;
 615     }
 616     return strtimestamp(t);
 617 }
 618
 619 const char *
 620 colon_datestr_from_pk (PKT_public_key *pk)
 621 {
 622     if (opt.fixed_list_mode) {
 623         static char buf[15];
 624         sprintf (buf, "%lu", (ulong)pk->timestamp);
 625         return buf;
 626     }
 627     return datestr_from_pk (pk);
 628 }
 629
 630 const char *
 631 colon_datestr_from_sk (PKT_secret_key *sk)
 632 {
 633     if (opt.fixed_list_mode) {
 634         static char buf[15];
 635         sprintf (buf, "%lu", (ulong)sk->timestamp);
 636         return buf;
 637     }
 638     return datestr_from_sk (sk);
 639 }
 640
 641 const char *
 642 colon_datestr_from_sig (PKT_signature *sig)
 643 {
 644     if (opt.fixed_list_mode) {
 645         static char buf[15];
 646         sprintf (buf, "%lu", (ulong)sig->timestamp);
 647         return buf;
 648     }
 649     return datestr_from_sig (sig);
 650 }
 651
 652 const char *
 653 colon_expirestr_from_sig (PKT_signature *sig)
 654 {
 655     if(!sig->expiredate)
 656         return "";
 657     if (opt.fixed_list_mode) {
 658         static char buf[15];
 659         sprintf (buf, "%lu", (ulong)sig->expiredate);
 660         return buf;
 661     }
 662     return expirestr_from_sig (sig);
 663 }
 664
 665
 666 /**************** .
 667  * Return a byte array with the fingerprint for the given PK/SK
 668  * The length of the array is returned in ret_len. Caller must free
 669  * the array or provide an array of length MAX_FINGERPRINT_LEN.
 670  */
 671
 672 byte *
 673 fingerprint_from_pk( PKT_public_key *pk, byte *array, size_t *ret_len )
 674 {
 675   byte *buf;
 676   const byte *dp;
 677   size_t len, nbytes;
 678   int i;
 679
 680   if ( pk->version < 4 )
 681     {
 682       if ( is_RSA(pk->pubkey_algo) )
 683         {
 684           /* RSA in version 3 packets is special. */
 685           gcry_md_hd_t md;
 686
 687           if (gcry_md_open (&md, DIGEST_ALGO_MD5, 0))
 688             BUG ();
 689           if ( pubkey_get_npkey (pk->pubkey_algo) > 1 )
 690             {
 691               for (i=0; i < 2; i++)
 692                 {
 693                   if (gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0,
 694                                       &nbytes, pk->pkey[i]))
 695                     BUG ();
 696                   /* fixme: Better allocate BUF on the stack */
 697                   buf = xmalloc (nbytes);
 698                   if (gcry_mpi_print (GCRYMPI_FMT_USG, buf, nbytes,
 699                                       NULL, pk->pkey[i]))
 700                     BUG ();
 701                   gcry_md_write (md, buf, nbytes);
 702                   xfree (buf);
 703                 }
 704             }
 705           gcry_md_final (md);
 706           if (!array)
 707             array = xmalloc (16);
 708           len = 16;
 709           memcpy (array, gcry_md_read (md, DIGEST_ALGO_MD5), 16);
 710           gcry_md_close(md);
 711         }
 712       else
 713         {
 714           if (!array)
 715             array = xmalloc(16);
 716           len = 16;
 717           memset (array,0,16);
 718         }
 719     }
 720   else
 721     {
 722       gcry_md_hd_t md;
 723
 724       md = do_fingerprint_md(pk);
 725       dp = gcry_md_read( md, 0 );
 726       len = gcry_md_get_algo_dlen (gcry_md_get_algo (md));
 727       assert( len <= MAX_FINGERPRINT_LEN );
 728       if (!array)
 729         array = xmalloc ( len );
 730       memcpy (array, dp, len );
 731       pk->keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
 732       pk->keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
 733       gcry_md_close( md);
 734     }
 735
 736   *ret_len = len;
 737   return array;
 738 }
 739
 740 byte *
 741 fingerprint_from_sk( PKT_secret_key *sk, byte *array, size_t *ret_len )
 742 {
 743   byte *buf;
 744   const char *dp;
 745   size_t len, nbytes;
 746   int i;
 747
 748   if (sk->version < 4)
 749     {
 750       if ( is_RSA(sk->pubkey_algo) )
 751         {
 752           /* RSA in version 3 packets is special. */
 753           gcry_md_hd_t md;
 754
 755           if (gcry_md_open (&md, DIGEST_ALGO_MD5, 0))
 756             BUG ();
 757           if (pubkey_get_npkey( sk->pubkey_algo ) > 1)
 758             {
 759               for (i=0; i < 2; i++)
 760                 {
 761                   if (gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0,
 762                                       &nbytes, sk->skey[i]))
 763                     BUG ();
 764                   /* fixme: Better allocate BUF on the stack */
 765                   buf = xmalloc (nbytes);
 766                   if (gcry_mpi_print (GCRYMPI_FMT_USG, buf, nbytes,
 767                                       NULL, sk->skey[i]))
 768                     BUG ();
 769                   gcry_md_write (md, buf, nbytes);
 770                   xfree (buf);
 771                 }
 772             }
 773           gcry_md_final(md);
 774           if (!array)
 775             array = xmalloc (16);
 776           len = 16;
 777           memcpy (array, gcry_md_read (md, DIGEST_ALGO_MD5), 16);
 778           gcry_md_close (md);
 779         }
 780       else
 781         {
 782           if (!array)
 783             array = xmalloc (16);
 784           len=16;
 785           memset (array,0,16);
 786         }
 787     }
 788   else
 789     {
 790       gcry_md_hd_t md;
 791
 792       md = do_fingerprint_md_sk(sk);
 793       if (md)
 794         {
 795           dp = gcry_md_read ( md, 0 );
 796           len = gcry_md_get_algo_dlen ( gcry_md_get_algo (md) );
 797           assert ( len <= MAX_FINGERPRINT_LEN );
 798           if (!array)
 799             array = xmalloc( len );
 800           memcpy (array, dp, len);
 801           gcry_md_close (md);
 802         }
 803       else
 804         {
 805           len = MAX_FINGERPRINT_LEN;
 806           if (!array)
 807             array = xmalloc (len);
 808           memset (array, 0, len);
 809         }
 810     }
 811
 812   *ret_len = len;
 813   return array;
 814 }
 815
 816
 817 /* Create a serialno/fpr string from the serial number and the secret
 818    key.  Caller must free the returned string.  There is no error
 819    return.  */
 820 char *
 821 serialno_and_fpr_from_sk (const unsigned char *sn, size_t snlen,
 822                           PKT_secret_key *sk)
 823 {
 824   unsigned char fpr[MAX_FINGERPRINT_LEN];
 825   size_t fprlen;
 826   char *buffer, *p;
 827   int i;
 828
 829   fingerprint_from_sk (sk, fpr, &fprlen);
 830   buffer = p = xmalloc (snlen*2 + 1 + fprlen*2 + 1);
 831   for (i=0; i < snlen; i++, p+=2)
 832     sprintf (p, "%02X", sn[i]);
 833   *p++ = '/';
 834   for (i=0; i < fprlen; i++, p+=2)
 835     sprintf (p, "%02X", fpr[i]);
 836   *p = 0;
 837   return buffer;
 838 }
 839