reactos/dll/win32/bcrypt/bcrypt_main.c

   1 /*
   2  * Copyright 2009 Henri Verbeet for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  *
  18  */
  19
  20 #include <wine/config.h>
  21
  22 #include <ntstatus.h>
  23 #define WIN32_NO_STATUS
  24 #include <windef.h>
  25 #include <winbase.h>
  26 #include <ntsecapi.h>
  27 #include <bcrypt.h>
  28
  29 #include <wine/debug.h>
  30 #include <wine/unicode.h>
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(bcrypt);
  33
  34 static HINSTANCE instance;
  35
  36 #if defined(HAVE_GNUTLS_HASH) && !defined(HAVE_COMMONCRYPTO_COMMONDIGEST_H)
  37 WINE_DECLARE_DEBUG_CHANNEL(winediag);
  38
  39 static void *libgnutls_handle;
  40 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
  41 MAKE_FUNCPTR(gnutls_global_deinit);
  42 MAKE_FUNCPTR(gnutls_global_init);
  43 MAKE_FUNCPTR(gnutls_global_set_log_function);
  44 MAKE_FUNCPTR(gnutls_global_set_log_level);
  45 MAKE_FUNCPTR(gnutls_hash);
  46 MAKE_FUNCPTR(gnutls_hash_deinit);
  47 MAKE_FUNCPTR(gnutls_hash_init);
  48 MAKE_FUNCPTR(gnutls_perror);
  49 #undef MAKE_FUNCPTR
  50
  51 static void gnutls_log( int level, const char *msg )
  52 {
  53     TRACE( "<%d> %s", level, msg );
  54 }
  55
  56 static BOOL gnutls_initialize(void)
  57 {
  58     int ret;
  59
  60     if (!(libgnutls_handle = wine_dlopen( SONAME_LIBGNUTLS, RTLD_NOW, NULL, 0 )))
  61     {
  62         ERR_(winediag)( "failed to load libgnutls, no support for crypto hashes\n" );
  63         return FALSE;
  64     }
  65
  66 #define LOAD_FUNCPTR(f) \
  67     if (!(p##f = wine_dlsym( libgnutls_handle, #f, NULL, 0 ))) \
  68     { \
  69         ERR( "failed to load %s\n", #f ); \
  70         goto fail; \
  71     }
  72
  73     LOAD_FUNCPTR(gnutls_global_deinit)
  74     LOAD_FUNCPTR(gnutls_global_init)
  75     LOAD_FUNCPTR(gnutls_global_set_log_function)
  76     LOAD_FUNCPTR(gnutls_global_set_log_level)
  77     LOAD_FUNCPTR(gnutls_hash);
  78     LOAD_FUNCPTR(gnutls_hash_deinit);
  79     LOAD_FUNCPTR(gnutls_hash_init);
  80     LOAD_FUNCPTR(gnutls_perror)
  81 #undef LOAD_FUNCPTR
  82
  83     if ((ret = pgnutls_global_init()) != GNUTLS_E_SUCCESS)
  84     {
  85         pgnutls_perror( ret );
  86         goto fail;
  87     }
  88
  89     if (TRACE_ON( bcrypt ))
  90     {
  91         pgnutls_global_set_log_level( 4 );
  92         pgnutls_global_set_log_function( gnutls_log );
  93     }
  94
  95     return TRUE;
  96
  97 fail:
  98     wine_dlclose( libgnutls_handle, NULL, 0 );
  99     libgnutls_handle = NULL;
 100     return FALSE;
 101 }
 102
 103 static void gnutls_uninitialize(void)
 104 {
 105     pgnutls_global_deinit();
 106     wine_dlclose( libgnutls_handle, NULL, 0 );
 107     libgnutls_handle = NULL;
 108 }
 109 #endif /* HAVE_GNUTLS_HASH && !HAVE_COMMONCRYPTO_COMMONDIGEST_H */
 110
 111 NTSTATUS WINAPI BCryptEnumAlgorithms(ULONG dwAlgOperations, ULONG *pAlgCount,
 112                                      BCRYPT_ALGORITHM_IDENTIFIER **ppAlgList, ULONG dwFlags)
 113 {
 114     FIXME("%08x, %p, %p, %08x - stub\n", dwAlgOperations, pAlgCount, ppAlgList, dwFlags);
 115
 116     *ppAlgList=NULL;
 117     *pAlgCount=0;
 118
 119     return STATUS_NOT_IMPLEMENTED;
 120 }
 121
 122 NTSTATUS WINAPI BCryptGenRandom(BCRYPT_ALG_HANDLE algorithm, UCHAR *buffer, ULONG count, ULONG flags)
 123 {
 124     const DWORD supported_flags = BCRYPT_USE_SYSTEM_PREFERRED_RNG;
 125     TRACE("%p, %p, %u, %08x - semi-stub\n", algorithm, buffer, count, flags);
 126
 127     if (!algorithm)
 128     {
 129         /* It's valid to call without an algorithm if BCRYPT_USE_SYSTEM_PREFERRED_RNG
 130          * is set. In this case the preferred system RNG is used.
 131          */
 132         if (!(flags & BCRYPT_USE_SYSTEM_PREFERRED_RNG))
 133             return STATUS_INVALID_HANDLE;
 134     }
 135     if (!buffer)
 136         return STATUS_INVALID_PARAMETER;
 137
 138     if (flags & ~supported_flags)
 139         FIXME("unsupported flags %08x\n", flags & ~supported_flags);
 140
 141     if (algorithm)
 142         FIXME("ignoring selected algorithm\n");
 143
 144     /* When zero bytes are requested the function returns success too. */
 145     if (!count)
 146         return STATUS_SUCCESS;
 147
 148     if (flags & BCRYPT_USE_SYSTEM_PREFERRED_RNG)
 149     {
 150         if (RtlGenRandom(buffer, count))
 151             return STATUS_SUCCESS;
 152     }
 153
 154     FIXME("called with unsupported parameters, returning error\n");
 155     return STATUS_NOT_IMPLEMENTED;
 156 }
 157
 158 #define MAGIC_ALG  (('A' << 24) | ('L' << 16) | ('G' << 8) | '0')
 159 #define MAGIC_HASH (('H' << 24) | ('A' << 16) | ('S' << 8) | 'H')
 160 struct object
 161 {
 162     ULONG magic;
 163 };
 164
 165 enum alg_id
 166 {
 167     ALG_ID_SHA1,
 168     ALG_ID_SHA256,
 169     ALG_ID_SHA384,
 170     ALG_ID_SHA512
 171 };
 172
 173 static const struct {
 174     ULONG hash_length;
 175     const WCHAR *alg_name;
 176 } alg_props[] = {
 177     /* ALG_ID_SHA1   */ { 20, BCRYPT_SHA1_ALGORITHM },
 178     /* ALG_ID_SHA256 */ { 32, BCRYPT_SHA256_ALGORITHM },
 179     /* ALG_ID_SHA384 */ { 48, BCRYPT_SHA384_ALGORITHM },
 180     /* ALG_ID_SHA512 */ { 64, BCRYPT_SHA512_ALGORITHM }
 181 };
 182
 183 struct algorithm
 184 {
 185     struct object hdr;
 186     enum alg_id   id;
 187 };
 188
 189 NTSTATUS WINAPI BCryptOpenAlgorithmProvider( BCRYPT_ALG_HANDLE *handle, LPCWSTR id, LPCWSTR implementation, DWORD flags )
 190 {
 191     struct algorithm *alg;
 192     enum alg_id alg_id;
 193
 194     TRACE( "%p, %s, %s, %08x\n", handle, wine_dbgstr_w(id), wine_dbgstr_w(implementation), flags );
 195
 196     if (!handle || !id) return STATUS_INVALID_PARAMETER;
 197     if (flags)
 198     {
 199         FIXME( "unimplemented flags %08x\n", flags );
 200         return STATUS_NOT_IMPLEMENTED;
 201     }
 202
 203     if (!strcmpW( id, BCRYPT_SHA1_ALGORITHM )) alg_id = ALG_ID_SHA1;
 204     else if (!strcmpW( id, BCRYPT_SHA256_ALGORITHM )) alg_id = ALG_ID_SHA256;
 205     else if (!strcmpW( id, BCRYPT_SHA384_ALGORITHM )) alg_id = ALG_ID_SHA384;
 206     else if (!strcmpW( id, BCRYPT_SHA512_ALGORITHM )) alg_id = ALG_ID_SHA512;
 207     else
 208     {
 209         FIXME( "algorithm %s not supported\n", debugstr_w(id) );
 210         return STATUS_NOT_IMPLEMENTED;
 211     }
 212     if (implementation && strcmpW( implementation, MS_PRIMITIVE_PROVIDER ))
 213     {
 214         FIXME( "implementation %s not supported\n", debugstr_w(implementation) );
 215         return STATUS_NOT_IMPLEMENTED;
 216     }
 217
 218     if (!(alg = HeapAlloc( GetProcessHeap(), 0, sizeof(*alg) ))) return STATUS_NO_MEMORY;
 219     alg->hdr.magic = MAGIC_ALG;
 220     alg->id        = alg_id;
 221
 222     *handle = alg;
 223     return STATUS_SUCCESS;
 224 }
 225
 226 NTSTATUS WINAPI BCryptCloseAlgorithmProvider( BCRYPT_ALG_HANDLE handle, DWORD flags )
 227 {
 228     struct algorithm *alg = handle;
 229
 230     TRACE( "%p, %08x\n", handle, flags );
 231
 232     if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
 233     HeapFree( GetProcessHeap(), 0, alg );
 234     return STATUS_SUCCESS;
 235 }
 236
 237 NTSTATUS WINAPI BCryptGetFipsAlgorithmMode(BOOLEAN *enabled)
 238 {
 239     FIXME("%p - semi-stub\n", enabled);
 240
 241     if (!enabled)
 242         return STATUS_INVALID_PARAMETER;
 243
 244     *enabled = FALSE;
 245     return STATUS_SUCCESS;
 246 }
 247
 248 #ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
 249 struct hash
 250 {
 251     struct object hdr;
 252     enum alg_id   alg_id;
 253     union
 254     {
 255         CC_SHA1_CTX   sha1_ctx;
 256         CC_SHA256_CTX sha256_ctx;
 257         CC_SHA512_CTX sha512_ctx;
 258     } u;
 259 };
 260
 261 static NTSTATUS hash_init( struct hash *hash )
 262 {
 263     switch (hash->alg_id)
 264     {
 265     case ALG_ID_SHA1:
 266         CC_SHA1_Init( &hash->u.sha1_ctx );
 267         break;
 268
 269     case ALG_ID_SHA256:
 270         CC_SHA256_Init( &hash->u.sha256_ctx );
 271         break;
 272
 273     case ALG_ID_SHA384:
 274         CC_SHA384_Init( &hash->u.sha512_ctx );
 275         break;
 276
 277     case ALG_ID_SHA512:
 278         CC_SHA512_Init( &hash->u.sha512_ctx );
 279         break;
 280
 281     default:
 282         ERR( "unhandled id %u\n", hash->alg_id );
 283         return STATUS_NOT_IMPLEMENTED;
 284     }
 285     return STATUS_SUCCESS;
 286 }
 287
 288 static NTSTATUS hash_update( struct hash *hash, UCHAR *input, ULONG size )
 289 {
 290     switch (hash->alg_id)
 291     {
 292     case ALG_ID_SHA1:
 293         CC_SHA1_Update( &hash->u.sha1_ctx, input, size );
 294         break;
 295
 296     case ALG_ID_SHA256:
 297         CC_SHA256_Update( &hash->u.sha256_ctx, input, size );
 298         break;
 299
 300     case ALG_ID_SHA384:
 301         CC_SHA384_Update( &hash->u.sha512_ctx, input, size );
 302         break;
 303
 304     case ALG_ID_SHA512:
 305         CC_SHA512_Update( &hash->u.sha512_ctx, input, size );
 306         break;
 307
 308     default:
 309         ERR( "unhandled id %u\n", hash->alg_id );
 310         return STATUS_NOT_IMPLEMENTED;
 311     }
 312     return STATUS_SUCCESS;
 313 }
 314
 315 static NTSTATUS hash_finish( struct hash *hash, UCHAR *output, ULONG size )
 316 {
 317     switch (hash->alg_id)
 318     {
 319     case ALG_ID_SHA1:
 320         CC_SHA1_Final( output, &hash->u.sha1_ctx );
 321         break;
 322
 323     case ALG_ID_SHA256:
 324         CC_SHA256_Final( output, &hash->u.sha256_ctx );
 325         break;
 326
 327     case ALG_ID_SHA384:
 328         CC_SHA384_Final( output, &hash->u.sha512_ctx );
 329         break;
 330
 331     case ALG_ID_SHA512:
 332         CC_SHA512_Final( output, &hash->u.sha512_ctx );
 333         break;
 334
 335     default:
 336         ERR( "unhandled id %u\n", hash->alg_id );
 337         break;
 338     }
 339     return STATUS_SUCCESS;
 340 }
 341 #elif defined(HAVE_GNUTLS_HASH)
 342 struct hash
 343 {
 344     struct object    hdr;
 345     enum alg_id      alg_id;
 346     gnutls_hash_hd_t handle;
 347 };
 348
 349 static NTSTATUS hash_init( struct hash *hash )
 350 {
 351     gnutls_digest_algorithm_t alg;
 352
 353     if (!libgnutls_handle) return STATUS_INTERNAL_ERROR;
 354
 355     switch (hash->alg_id)
 356     {
 357     case ALG_ID_SHA1:
 358         alg = GNUTLS_DIG_SHA1;
 359         break;
 360
 361     case ALG_ID_SHA256:
 362         alg = GNUTLS_DIG_SHA256;
 363         break;
 364
 365     case ALG_ID_SHA384:
 366         alg = GNUTLS_DIG_SHA384;
 367         break;
 368
 369     case ALG_ID_SHA512:
 370         alg = GNUTLS_DIG_SHA512;
 371         break;
 372
 373     default:
 374         ERR( "unhandled id %u\n", hash->alg_id );
 375         return STATUS_NOT_IMPLEMENTED;
 376     }
 377
 378     if (pgnutls_hash_init( &hash->handle, alg )) return STATUS_INTERNAL_ERROR;
 379     return STATUS_SUCCESS;
 380 }
 381
 382 static NTSTATUS hash_update( struct hash *hash, UCHAR *input, ULONG size )
 383 {
 384     if (pgnutls_hash( hash->handle, input, size )) return STATUS_INTERNAL_ERROR;
 385     return STATUS_SUCCESS;
 386 }
 387
 388 static NTSTATUS hash_finish( struct hash *hash, UCHAR *output, ULONG size )
 389 {
 390     pgnutls_hash_deinit( hash->handle, output );
 391     return STATUS_SUCCESS;
 392 }
 393 #else
 394 struct hash
 395 {
 396     struct object hdr;
 397     enum alg_id   alg_id;
 398 };
 399
 400 static NTSTATUS hash_init( struct hash *hash )
 401 {
 402     ERR( "support for hashes not available at build time\n" );
 403     return STATUS_NOT_IMPLEMENTED;
 404 }
 405
 406 static NTSTATUS hash_update( struct hash *hash, UCHAR *input, ULONG size )
 407 {
 408     ERR( "support for hashes not available at build time\n" );
 409     return STATUS_NOT_IMPLEMENTED;
 410 }
 411
 412 static NTSTATUS hash_finish( struct hash *hash, UCHAR *output, ULONG size )
 413 {
 414     ERR( "support for hashes not available at build time\n" );
 415     return STATUS_NOT_IMPLEMENTED;
 416 }
 417 #endif
 418
 419 #define OBJECT_LENGTH_SHA1      278
 420 #define OBJECT_LENGTH_SHA256    286
 421 #define OBJECT_LENGTH_SHA384    382
 422 #define OBJECT_LENGTH_SHA512    382
 423
 424 static NTSTATUS generic_alg_property( enum alg_id id, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
 425 {
 426     if (!strcmpW( prop, BCRYPT_HASH_LENGTH ))
 427     {
 428         *ret_size = sizeof(ULONG);
 429         if (size < sizeof(ULONG))
 430             return STATUS_BUFFER_TOO_SMALL;
 431         if(buf)
 432             *(ULONG*)buf = alg_props[id].hash_length;
 433         return STATUS_SUCCESS;
 434     }
 435
 436     if (!strcmpW( prop, BCRYPT_ALGORITHM_NAME ))
 437     {
 438         *ret_size = (strlenW(alg_props[id].alg_name)+1)*sizeof(WCHAR);
 439         if (size < *ret_size)
 440             return STATUS_BUFFER_TOO_SMALL;
 441         if(buf)
 442             memcpy(buf, alg_props[id].alg_name, *ret_size);
 443         return STATUS_SUCCESS;
 444     }
 445
 446     return STATUS_NOT_IMPLEMENTED;
 447 }
 448
 449 static NTSTATUS get_alg_property( enum alg_id id, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
 450 {
 451     NTSTATUS status;
 452     ULONG value;
 453
 454     status = generic_alg_property( id, prop, buf, size, ret_size );
 455     if (status != STATUS_NOT_IMPLEMENTED)
 456         return status;
 457
 458     switch (id)
 459     {
 460     case ALG_ID_SHA1:
 461         if (!strcmpW( prop, BCRYPT_OBJECT_LENGTH ))
 462         {
 463             value = OBJECT_LENGTH_SHA1;
 464             break;
 465         }
 466         FIXME( "unsupported sha1 algorithm property %s\n", debugstr_w(prop) );
 467         return STATUS_NOT_IMPLEMENTED;
 468
 469     case ALG_ID_SHA256:
 470         if (!strcmpW( prop, BCRYPT_OBJECT_LENGTH ))
 471         {
 472             value = OBJECT_LENGTH_SHA256;
 473             break;
 474         }
 475         FIXME( "unsupported sha256 algorithm property %s\n", debugstr_w(prop) );
 476         return STATUS_NOT_IMPLEMENTED;
 477
 478     case ALG_ID_SHA384:
 479         if (!strcmpW( prop, BCRYPT_OBJECT_LENGTH ))
 480         {
 481             value = OBJECT_LENGTH_SHA384;
 482             break;
 483         }
 484         FIXME( "unsupported sha384 algorithm property %s\n", debugstr_w(prop) );
 485         return STATUS_NOT_IMPLEMENTED;
 486
 487     case ALG_ID_SHA512:
 488         if (!strcmpW( prop, BCRYPT_OBJECT_LENGTH ))
 489         {
 490             value = OBJECT_LENGTH_SHA512;
 491             break;
 492         }
 493         FIXME( "unsupported sha512 algorithm property %s\n", debugstr_w(prop) );
 494         return STATUS_NOT_IMPLEMENTED;
 495
 496     default:
 497         FIXME( "unsupported algorithm %u\n", id );
 498         return STATUS_NOT_IMPLEMENTED;
 499     }
 500
 501     if (size < sizeof(ULONG))
 502     {
 503         *ret_size = sizeof(ULONG);
 504         return STATUS_BUFFER_TOO_SMALL;
 505     }
 506     if (buf) *(ULONG *)buf = value;
 507     *ret_size = sizeof(ULONG);
 508
 509     return STATUS_SUCCESS;
 510 }
 511
 512 static NTSTATUS get_hash_property( enum alg_id id, const WCHAR *prop, UCHAR *buf, ULONG size, ULONG *ret_size )
 513 {
 514     NTSTATUS status;
 515
 516     status = generic_alg_property( id, prop, buf, size, ret_size );
 517     if (status == STATUS_NOT_IMPLEMENTED)
 518         FIXME( "unsupported property %s\n", debugstr_w(prop) );
 519     return status;
 520 }
 521
 522 NTSTATUS WINAPI BCryptGetProperty( BCRYPT_HANDLE handle, LPCWSTR prop, UCHAR *buffer, ULONG count, ULONG *res, ULONG flags )
 523 {
 524     struct object *object = handle;
 525
 526     TRACE( "%p, %s, %p, %u, %p, %08x\n", handle, wine_dbgstr_w(prop), buffer, count, res, flags );
 527
 528     if (!object) return STATUS_INVALID_HANDLE;
 529     if (!prop || !res) return STATUS_INVALID_PARAMETER;
 530
 531     switch (object->magic)
 532     {
 533     case MAGIC_ALG:
 534     {
 535         const struct algorithm *alg = (const struct algorithm *)object;
 536         return get_alg_property( alg->id, prop, buffer, count, res );
 537     }
 538     case MAGIC_HASH:
 539     {
 540         const struct hash *hash = (const struct hash *)object;
 541         return get_hash_property( hash->alg_id, prop, buffer, count, res );
 542     }
 543     default:
 544         WARN( "unknown magic %08x\n", object->magic );
 545         return STATUS_INVALID_HANDLE;
 546     }
 547 }
 548
 549 NTSTATUS WINAPI BCryptCreateHash( BCRYPT_ALG_HANDLE algorithm, BCRYPT_HASH_HANDLE *handle, UCHAR *object, ULONG objectlen,
 550                                   UCHAR *secret, ULONG secretlen, ULONG flags )
 551 {
 552     struct algorithm *alg = algorithm;
 553     struct hash *hash;
 554     NTSTATUS status;
 555
 556     TRACE( "%p, %p, %p, %u, %p, %u, %08x - stub\n", algorithm, handle, object, objectlen,
 557            secret, secretlen, flags );
 558     if (flags)
 559     {
 560         FIXME( "unimplemented flags %08x\n", flags );
 561         return STATUS_NOT_IMPLEMENTED;
 562     }
 563
 564     if (!alg || alg->hdr.magic != MAGIC_ALG) return STATUS_INVALID_HANDLE;
 565     if (object) FIXME( "ignoring object buffer\n" );
 566
 567     if (!(hash = HeapAlloc( GetProcessHeap(), 0, sizeof(*hash) ))) return STATUS_NO_MEMORY;
 568     hash->hdr.magic = MAGIC_HASH;
 569     hash->alg_id    = alg->id;
 570     if ((status = hash_init( hash )) != STATUS_SUCCESS)
 571     {
 572         HeapFree( GetProcessHeap(), 0, hash );
 573         return status;
 574     }
 575
 576     *handle = hash;
 577     return STATUS_SUCCESS;
 578 }
 579
 580 NTSTATUS WINAPI BCryptDestroyHash( BCRYPT_HASH_HANDLE handle )
 581 {
 582     struct hash *hash = handle;
 583
 584     TRACE( "%p\n", handle );
 585
 586     if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
 587     HeapFree( GetProcessHeap(), 0, hash );
 588     return STATUS_SUCCESS;
 589 }
 590
 591 NTSTATUS WINAPI BCryptHashData( BCRYPT_HASH_HANDLE handle, UCHAR *input, ULONG size, ULONG flags )
 592 {
 593     struct hash *hash = handle;
 594
 595     TRACE( "%p, %p, %u, %08x\n", handle, input, size, flags );
 596
 597     if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
 598     if (!input) return STATUS_INVALID_PARAMETER;
 599
 600     return hash_update( hash, input, size );
 601 }
 602
 603 NTSTATUS WINAPI BCryptFinishHash( BCRYPT_HASH_HANDLE handle, UCHAR *output, ULONG size, ULONG flags )
 604 {
 605     struct hash *hash = handle;
 606
 607     TRACE( "%p, %p, %u, %08x\n", handle, output, size, flags );
 608
 609     if (!hash || hash->hdr.magic != MAGIC_HASH) return STATUS_INVALID_HANDLE;
 610     if (!output) return STATUS_INVALID_PARAMETER;
 611
 612     return hash_finish( hash, output, size );
 613 }
 614
 615 BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 616 {
 617     switch (reason)
 618     {
 619     case DLL_PROCESS_ATTACH:
 620         instance = hinst;
 621         DisableThreadLibraryCalls( hinst );
 622 #if defined(HAVE_GNUTLS_HASH) && !defined(HAVE_COMMONCRYPTO_COMMONDIGEST_H)
 623         gnutls_initialize();
 624 #endif
 625         break;
 626
 627     case DLL_PROCESS_DETACH:
 628         if (reserved) break;
 629 #if defined(HAVE_GNUTLS_HASH) && !defined(HAVE_COMMONCRYPTO_COMMONDIGEST_H)
 630         gnutls_uninitialize();
 631 #endif
 632         break;
 633     }
 634     return TRUE;
 635 }