2 * Copyright 2005 Kees Cook <kees@outflux.net>
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.
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.
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
21 * The Win32 CryptProtectData and CryptUnprotectData functions are meant
22 * to provide a mechanism for encrypting data on a machine where other users
23 * of the system can't be trusted. It is used in many examples as a way
24 * to store username and password information to the registry, but store
25 * it not in the clear.
27 * The encryption is symmetric, but the method is unknown. However, since
28 * it is keyed to the machine and the user, it is unlikely that the values
29 * would be portable. Since programs must first call CryptProtectData to
30 * get a cipher text, the underlying system doesn't have to exactly
31 * match the real Windows version. However, attempts have been made to
32 * at least try to look like the Windows version, including guesses at the
33 * purpose of various portions of the "opaque data blob" that is used.
45 #include "wine/debug.h"
47 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
49 #define CRYPT32_PROTECTDATA_PROV PROV_RSA_FULL
50 #define CRYPT32_PROTECTDATA_HASH_CALG CALG_SHA1
51 #define CRYPT32_PROTECTDATA_HASH_LEN 160
52 #define CRYPT32_PROTECTDATA_KEY_CALG CALG_3DES
53 #define CRYPT32_PROTECTDATA_KEY_LEN 168
54 #define CRYPT32_PROTECTDATA_SALT_LEN 16
56 static const BYTE crypt32_protectdata_secret[] = {
57 'I','\'','m',' ','h','u','n','t','i','n','g',' ',
58 'w','a','b','b','i','t','s',0
62 * The data format returned by the real Windows CryptProtectData seems
63 * to be something like this:
65 DWORD count0; - how many "info0_*[16]" blocks follow (was always 1)
66 BYTE info0_0[16]; - unknown information - persistent across invocations,
67 ... reboots, password changes, and users
68 DWORD count1; - how many "info1_*[16]" blocks follow (was always 1)
69 BYTE info1_0[16]; - unknown information - unique to each user, but
70 ... persistent across reboots and password changes
71 DWORD null0; - NULL "end of records"?
72 DWORD str_len; - byte length of WCHAR string including term
73 BYTE str[str_len]; - The "dataDescription" value as a NULL-terminated
74 little-endian WCHAR string
75 ALG_ID cipher_alg; - cipher algo - was CALG_3DES
76 DWORD cipher_key_len; - cipher key bit length - was 0xa8==168
77 DWORD data_len; - length of data (was 16 in samples)
78 BYTE data[data_len]; - unknown data (fingerprint?)
80 ALG_ID hash_alg; - hash algo - was CALG_SHA1
81 DWORD hash_len; - bit length of hash - was 0xa0==160
82 DWORD salt_len; - length of salt(?) data
83 BYTE salt[salt_len]; - salt(?) for symmetric encryption
84 DWORD cipher_len; - length of cipher(?) data - was close to plain len
85 BYTE cipher[cipher_len]; - cipher text?
86 DWORD crc_len; - length of fingerprint(?) data - was 20 byte==160b SHA1
87 BYTE crc[crc_len]; - fingerprint of record?
89 * The data structures used in Wine are modelled after this guess.
95 DATA_BLOB info0; /* using this to hold crypt_magic_str */
99 WCHAR * szDataDescr; /* serialized differently than the DATA_BLOBs */
101 DWORD cipher_key_len;
108 DATA_BLOB fingerprint;
111 /* this is used to check if an incoming structure was built by Wine */
112 static const char crypt_magic_str[] = "Wine Crypt32 ok";
114 /* debugging tool to print strings of hex chars */
116 hex_str(const unsigned char *p, int n)
122 ptr = wine_dbg_sprintf("%s","");
127 ptr = wine_dbg_sprintf("%s%s",ptr,report);
130 sprintf(report+strlen(report),"%s%02x", r ? "," : "", *p++);
132 return wine_dbg_sprintf("%s%s",ptr,report);
135 #define TRACE_DATA_BLOB(blob) do { \
136 TRACE("%s cbData: %u\n", #blob ,(unsigned int)((blob)->cbData)); \
137 TRACE("%s pbData @ %p:%s\n", #blob ,(blob)->pbData, \
138 hex_str((blob)->pbData, (blob)->cbData)); \
142 void serialize_dword(DWORD value,BYTE ** ptr)
144 /*TRACE("called\n");*/
146 memcpy(*ptr,&value,sizeof(DWORD));
151 void serialize_string(const BYTE *str, BYTE **ptr, DWORD len, DWORD width,
154 /*TRACE("called %ux%u\n",(unsigned int)len,(unsigned int)width);*/
158 serialize_dword(len,ptr);
160 memcpy(*ptr,str,len*width);
165 BOOL unserialize_dword(const BYTE *ptr, DWORD *index, DWORD size, DWORD *value)
167 /*TRACE("called\n");*/
169 if (!ptr || !index || !value) return FALSE;
171 if (*index+sizeof(DWORD)>size)
176 memcpy(value,&(ptr[*index]),sizeof(DWORD));
177 *index+=sizeof(DWORD);
183 BOOL unserialize_string(const BYTE *ptr, DWORD *index, DWORD size,
184 DWORD len, DWORD width, BOOL inline_len,
185 BYTE ** data, DWORD * stored)
187 /*TRACE("called\n");*/
189 if (!ptr || !data) return FALSE;
192 if (!unserialize_dword(ptr,index,size,&len))
196 if (*index+len*width>size)
201 if (!(*data = CryptMemAlloc( len*width)))
206 memcpy(*data,&(ptr[*index]),len*width);
217 BOOL serialize(const struct protect_data_t *pInfo, DATA_BLOB *pSerial)
225 if (!pInfo || !pInfo->szDataDescr || !pSerial ||
226 !pInfo->info0.pbData || !pInfo->info1.pbData ||
227 !pInfo->data0.pbData || !pInfo->salt.pbData ||
228 !pInfo->cipher.pbData || !pInfo->fingerprint.pbData)
233 if (pInfo->info0.cbData!=16)
235 ERR("protect_data_t info0 not 16 bytes long\n");
238 if (pInfo->info1.cbData!=16)
240 ERR("protect_data_t info1 not 16 bytes long\n");
243 dwStrLen=lstrlenW(pInfo->szDataDescr);
246 pSerial->cbData+=sizeof(DWORD)*8; /* 8 raw DWORDs */
247 pSerial->cbData+=sizeof(DWORD)*4; /* 4 BLOBs with size */
248 pSerial->cbData+=pInfo->info0.cbData;
249 pSerial->cbData+=pInfo->info1.cbData;
250 pSerial->cbData+=(dwStrLen+1)*sizeof(WCHAR) + 4; /* str, null, size */
251 pSerial->cbData+=pInfo->data0.cbData;
252 pSerial->cbData+=pInfo->salt.cbData;
253 pSerial->cbData+=pInfo->cipher.cbData;
254 pSerial->cbData+=pInfo->fingerprint.cbData;
256 /* save the actual structure size */
257 dwStruct = pSerial->cbData;
258 /* There may be a 256 byte minimum, but I can't prove it. */
259 /*if (pSerial->cbData<256) pSerial->cbData=256;*/
261 pSerial->pbData=LocalAlloc(LPTR,pSerial->cbData);
262 if (!pSerial->pbData) return FALSE;
267 serialize_dword(pInfo->count0,&ptr);
268 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
271 serialize_string(pInfo->info0.pbData,&ptr,
272 pInfo->info0.cbData,sizeof(BYTE),FALSE);
273 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
276 serialize_dword(pInfo->count1,&ptr);
277 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
280 serialize_string(pInfo->info1.pbData,&ptr,
281 pInfo->info1.cbData,sizeof(BYTE),FALSE);
282 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
285 serialize_dword(pInfo->null0,&ptr);
286 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
289 serialize_string((BYTE*)pInfo->szDataDescr,&ptr,
290 (dwStrLen+1)*sizeof(WCHAR),sizeof(BYTE),TRUE);
291 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
294 serialize_dword(pInfo->cipher_alg,&ptr);
295 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
297 serialize_dword(pInfo->cipher_key_len,&ptr);
298 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
301 serialize_string(pInfo->data0.pbData,&ptr,
302 pInfo->data0.cbData,sizeof(BYTE),TRUE);
303 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
306 serialize_dword(pInfo->null1,&ptr);
307 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
310 serialize_dword(pInfo->hash_alg,&ptr);
311 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
313 serialize_dword(pInfo->hash_len,&ptr);
314 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
317 serialize_string(pInfo->salt.pbData,&ptr,
318 pInfo->salt.cbData,sizeof(BYTE),TRUE);
319 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
322 serialize_string(pInfo->cipher.pbData,&ptr,
323 pInfo->cipher.cbData,sizeof(BYTE),TRUE);
324 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
327 serialize_string(pInfo->fingerprint.pbData,&ptr,
328 pInfo->fingerprint.cbData,sizeof(BYTE),TRUE);
329 /*TRACE("used %u\n",ptr-pSerial->pbData);*/
331 if (ptr - pSerial->pbData != dwStruct)
333 ERR("struct size changed!? expected %u\n", dwStruct);
334 LocalFree(pSerial->pbData);
335 pSerial->pbData=NULL;
344 BOOL unserialize(const DATA_BLOB *pSerial, struct protect_data_t *pInfo)
353 if (!pInfo || !pSerial || !pSerial->pbData)
358 size=pSerial->cbData;
361 if (!unserialize_dword(ptr,&index,size,&pInfo->count0))
363 ERR("reading count0 failed!\n");
368 if (!unserialize_string(ptr,&index,size,16,sizeof(BYTE),FALSE,
369 &pInfo->info0.pbData, &pInfo->info0.cbData))
371 ERR("reading info0 failed!\n");
376 if (!unserialize_dword(ptr,&index,size,&pInfo->count1))
378 ERR("reading count1 failed!\n");
383 if (!unserialize_string(ptr,&index,size,16,sizeof(BYTE),FALSE,
384 &pInfo->info1.pbData, &pInfo->info1.cbData))
386 ERR("reading info1 failed!\n");
391 if (!unserialize_dword(ptr,&index,size,&pInfo->null0))
393 ERR("reading null0 failed!\n");
398 if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
399 (BYTE**)&pInfo->szDataDescr, NULL))
401 ERR("reading szDataDescr failed!\n");
406 if (!unserialize_dword(ptr,&index,size,&pInfo->cipher_alg))
408 ERR("reading cipher_alg failed!\n");
413 if (!unserialize_dword(ptr,&index,size,&pInfo->cipher_key_len))
415 ERR("reading cipher_key_len failed!\n");
420 if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
421 &pInfo->data0.pbData, &pInfo->data0.cbData))
423 ERR("reading data0 failed!\n");
428 if (!unserialize_dword(ptr,&index,size,&pInfo->null1))
430 ERR("reading null1 failed!\n");
435 if (!unserialize_dword(ptr,&index,size,&pInfo->hash_alg))
437 ERR("reading hash_alg failed!\n");
442 if (!unserialize_dword(ptr,&index,size,&pInfo->hash_len))
444 ERR("reading hash_len failed!\n");
449 if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
450 &pInfo->salt.pbData, &pInfo->salt.cbData))
452 ERR("reading salt failed!\n");
457 if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
458 &pInfo->cipher.pbData, &pInfo->cipher.cbData))
460 ERR("reading cipher failed!\n");
465 if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
466 &pInfo->fingerprint.pbData, &pInfo->fingerprint.cbData))
468 ERR("reading fingerprint failed!\n");
472 /* allow structure size to be too big (since some applications
473 * will pad this up to 256 bytes, it seems) */
476 /* this is an impossible-to-reach test, but if the padding
477 * issue is ever understood, this may become more useful */
478 ERR("loaded corrupt structure! (used %u expected %u)\n", index, size);
485 /* perform sanity checks */
487 BOOL valid_protect_data(const struct protect_data_t *pInfo)
493 if (pInfo->count0 != 0x0001)
495 ERR("count0 != 0x0001 !\n");
498 if (pInfo->count1 != 0x0001)
500 ERR("count0 != 0x0001 !\n");
503 if (pInfo->null0 != 0x0000)
505 ERR("null0 != 0x0000 !\n");
508 if (pInfo->null1 != 0x0000)
510 ERR("null1 != 0x0000 !\n");
513 /* since we have no idea what info0 is used for, and it seems
514 * rather constant, we can test for a Wine-specific magic string
515 * there to be reasonably sure we're using data created by the Wine
516 * implementation of CryptProtectData.
518 if (pInfo->info0.cbData!=strlen(crypt_magic_str)+1 ||
519 strcmp( (LPCSTR)pInfo->info0.pbData,crypt_magic_str) != 0)
521 ERR("info0 magic value not matched !\n");
527 ERR("unrecognized CryptProtectData block\n");
534 void free_protect_data(struct protect_data_t * pInfo)
540 CryptMemFree(pInfo->info0.pbData);
541 CryptMemFree(pInfo->info1.pbData);
542 CryptMemFree(pInfo->szDataDescr);
543 CryptMemFree(pInfo->data0.pbData);
544 CryptMemFree(pInfo->salt.pbData);
545 CryptMemFree(pInfo->cipher.pbData);
546 CryptMemFree(pInfo->fingerprint.pbData);
549 /* copies a string into a data blob */
551 BYTE *convert_str_to_blob(LPCSTR str, DATA_BLOB *blob)
553 if (!str || !blob) return NULL;
555 blob->cbData=strlen(str)+1;
556 if (!(blob->pbData=CryptMemAlloc(blob->cbData)))
561 strcpy((LPSTR)blob->pbData, str);
568 * Populates everything except "cipher" and "fingerprint".
571 BOOL fill_protect_data(struct protect_data_t * pInfo, LPCWSTR szDataDescr,
578 if (!pInfo) return FALSE;
580 dwStrLen=lstrlenW(szDataDescr);
582 memset(pInfo,0,sizeof(*pInfo));
584 pInfo->count0=0x0001;
586 convert_str_to_blob(crypt_magic_str, &pInfo->info0);
588 pInfo->count1=0x0001;
590 convert_str_to_blob(crypt_magic_str, &pInfo->info1);
594 if ((pInfo->szDataDescr=CryptMemAlloc((dwStrLen+1)*sizeof(WCHAR))))
596 memcpy(pInfo->szDataDescr,szDataDescr,(dwStrLen+1)*sizeof(WCHAR));
599 pInfo->cipher_alg=CRYPT32_PROTECTDATA_KEY_CALG;
600 pInfo->cipher_key_len=CRYPT32_PROTECTDATA_KEY_LEN;
602 convert_str_to_blob(crypt_magic_str, &pInfo->data0);
605 pInfo->hash_alg=CRYPT32_PROTECTDATA_HASH_CALG;
606 pInfo->hash_len=CRYPT32_PROTECTDATA_HASH_LEN;
608 /* allocate memory to hold a salt */
609 if ((pInfo->salt.pbData=CryptMemAlloc(CRYPT32_PROTECTDATA_SALT_LEN)))
611 /* generate random salt */
612 if (!CryptGenRandom(hProv, CRYPT32_PROTECTDATA_SALT_LEN, pInfo->salt.pbData))
614 ERR("CryptGenRandom\n");
615 free_protect_data(pInfo);
618 pInfo->salt.cbData=CRYPT32_PROTECTDATA_SALT_LEN;
619 /* debug: show our salt */
620 TRACE_DATA_BLOB(&pInfo->salt);
622 pInfo->cipher.cbData=0;
623 pInfo->cipher.pbData=NULL;
625 pInfo->fingerprint.cbData=0;
626 pInfo->fingerprint.pbData=NULL;
628 /* check all the allocations at once */
629 if (!pInfo->info0.pbData ||
630 !pInfo->info1.pbData ||
631 !pInfo->szDataDescr ||
632 !pInfo->data0.pbData ||
636 ERR("could not allocate protect_data structures\n");
637 free_protect_data(pInfo);
645 BOOL convert_hash_to_blob(HCRYPTHASH hHash, DATA_BLOB * blob)
651 if (!blob) return FALSE;
653 dwSize=sizeof(DWORD);
654 if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)&blob->cbData,
657 ERR("failed to get hash size\n");
661 if (!(blob->pbData=CryptMemAlloc(blob->cbData)))
663 ERR("failed to allocate blob memory\n");
668 if (!CryptGetHashParam(hHash, HP_HASHVAL, blob->pbData, &dwSize, 0))
670 ERR("failed to get hash value\n");
671 CryptMemFree(blob->pbData);
680 /* test that a given hash matches an exported-to-blob hash value */
682 BOOL hash_matches_blob(HCRYPTHASH hHash, const DATA_BLOB *two)
687 if (!two || !two->pbData) return FALSE;
689 if (!convert_hash_to_blob(hHash,&one)) {
693 if ( one.cbData == two->cbData &&
694 memcmp( one.pbData, two->pbData, one.cbData ) == 0 )
699 CryptMemFree(one.pbData);
703 /* create an encryption key from a given salt and optional entropy */
705 BOOL load_encryption_key(HCRYPTPROV hProv, DWORD key_len, const DATA_BLOB *salt,
706 const DATA_BLOB *pOptionalEntropy, HCRYPTKEY *phKey)
709 HCRYPTHASH hSaltHash;
710 char * szUsername = NULL;
714 /* create hash for salt */
715 if (!salt || !phKey ||
716 !CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hSaltHash))
718 ERR("CryptCreateHash\n");
722 /* This should be the "logon credentials" instead of username */
723 dwError=GetLastError();
725 if (!GetUserNameA(NULL,&dwUsernameLen) &&
726 GetLastError()==ERROR_MORE_DATA && dwUsernameLen &&
727 (szUsername = CryptMemAlloc(dwUsernameLen)))
730 GetUserNameA( szUsername, &dwUsernameLen );
732 SetLastError(dwError);
734 /* salt the hash with:
736 * - an "internal secret"
737 * - randomness (from the salt)
738 * - user-supplied entropy
740 if ((szUsername && !CryptHashData(hSaltHash,(LPBYTE)szUsername,dwUsernameLen,0)) ||
741 !CryptHashData(hSaltHash,crypt32_protectdata_secret,
742 sizeof(crypt32_protectdata_secret)-1,0) ||
743 !CryptHashData(hSaltHash,salt->pbData,salt->cbData,0) ||
744 (pOptionalEntropy && !CryptHashData(hSaltHash,
745 pOptionalEntropy->pbData,
746 pOptionalEntropy->cbData,0)))
748 ERR("CryptHashData\n");
752 /* produce a symmetric key */
753 if (rc && !CryptDeriveKey(hProv,CRYPT32_PROTECTDATA_KEY_CALG,
754 hSaltHash,key_len << 16 | CRYPT_EXPORTABLE,phKey))
756 ERR("CryptDeriveKey\n");
761 CryptDestroyHash(hSaltHash);
762 CryptMemFree(szUsername);
767 /* debugging tool to print the structures of a ProtectData call */
769 report(const DATA_BLOB* pDataIn, const DATA_BLOB* pOptionalEntropy,
770 CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct, DWORD dwFlags)
772 TRACE("pPromptStruct: %p\n", pPromptStruct);
775 TRACE(" cbSize: 0x%x\n", pPromptStruct->cbSize);
776 TRACE(" dwPromptFlags: 0x%x\n", pPromptStruct->dwPromptFlags);
777 TRACE(" hwndApp: %p\n", pPromptStruct->hwndApp);
778 TRACE(" szPrompt: %p %s\n",
779 pPromptStruct->szPrompt,
780 pPromptStruct->szPrompt ? debugstr_w(pPromptStruct->szPrompt)
783 TRACE("dwFlags: 0x%04x\n", dwFlags);
784 TRACE_DATA_BLOB(pDataIn);
785 if (pOptionalEntropy)
787 TRACE_DATA_BLOB(pOptionalEntropy);
788 TRACE(" %s\n",debugstr_an((LPCSTR)pOptionalEntropy->pbData,pOptionalEntropy->cbData));
794 /***************************************************************************
795 * CryptProtectData [CRYPT32.@]
797 * Generate Cipher data from given Plain and Entropy data.
800 * pDataIn [I] Plain data to be enciphered
801 * szDataDescr [I] Optional Unicode string describing the Plain data
802 * pOptionalEntropy [I] Optional entropy data to adjust cipher, can be NULL
803 * pvReserved [I] Reserved, must be NULL
804 * pPromptStruct [I] Structure describing if/how to prompt during ciphering
805 * dwFlags [I] Flags describing options to the ciphering
806 * pDataOut [O] Resulting Cipher data, for calls to CryptUnprotectData
809 * TRUE If a Cipher was generated.
810 * FALSE If something failed and no Cipher is available.
813 * The true Windows encryption and keying mechanisms are unknown.
815 * dwFlags and pPromptStruct are currently ignored.
818 * Memory allocated in pDataOut must be freed with LocalFree.
821 BOOL WINAPI CryptProtectData(DATA_BLOB* pDataIn,
823 DATA_BLOB* pOptionalEntropy,
825 CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,
829 static const WCHAR empty_str[1];
832 struct protect_data_t protect_data;
839 SetLastError(ERROR_SUCCESS);
841 if (!pDataIn || !pDataOut)
843 SetLastError(ERROR_INVALID_PARAMETER);
847 /* debug: show our arguments */
848 report(pDataIn,pOptionalEntropy,pPromptStruct,dwFlags);
849 TRACE("\tszDataDescr: %p %s\n", szDataDescr,
850 szDataDescr ? debugstr_w(szDataDescr) : "");
852 /* Windows appears to create an empty szDataDescr instead of maintaining
855 szDataDescr = empty_str;
857 /* get crypt context */
858 if (!CryptAcquireContextW(&hProv,NULL,MS_ENHANCED_PROV_W,CRYPT32_PROTECTDATA_PROV,CRYPT_VERIFYCONTEXT))
860 ERR("CryptAcquireContextW failed\n");
864 /* populate our structure */
865 if (!fill_protect_data(&protect_data,szDataDescr,hProv))
867 ERR("fill_protect_data\n");
872 if (!load_encryption_key(hProv,protect_data.cipher_key_len,&protect_data.salt,pOptionalEntropy,&hKey))
874 goto free_protect_data;
877 /* create a hash for the encryption validation */
878 if (!CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hHash))
880 ERR("CryptCreateHash\n");
884 /* calculate storage required */
885 dwLength=pDataIn->cbData;
886 if (CryptEncrypt(hKey, 0, TRUE, 0, pDataIn->pbData, &dwLength, 0) ||
887 GetLastError()!=ERROR_MORE_DATA)
889 ERR("CryptEncrypt\n");
892 TRACE("required encrypted storage: %u\n", dwLength);
894 /* copy plain text into cipher area for CryptEncrypt call */
895 protect_data.cipher.cbData=dwLength;
896 if (!(protect_data.cipher.pbData=CryptMemAlloc(
897 protect_data.cipher.cbData)))
899 ERR("CryptMemAlloc\n");
902 memcpy(protect_data.cipher.pbData,pDataIn->pbData,pDataIn->cbData);
905 dwLength=pDataIn->cbData;
906 if (!CryptEncrypt(hKey, hHash, TRUE, 0, protect_data.cipher.pbData,
907 &dwLength, protect_data.cipher.cbData))
909 ERR("CryptEncrypt %u\n", GetLastError());
912 protect_data.cipher.cbData=dwLength;
914 /* debug: show the cipher */
915 TRACE_DATA_BLOB(&protect_data.cipher);
917 /* attach our fingerprint */
918 if (!convert_hash_to_blob(hHash, &protect_data.fingerprint))
920 ERR("convert_hash_to_blob\n");
924 /* serialize into an opaque blob */
925 if (!serialize(&protect_data, pDataOut))
935 CryptDestroyHash(hHash);
937 CryptDestroyKey(hKey);
939 free_protect_data(&protect_data);
941 CryptReleaseContext(hProv,0);
943 /* If some error occurred, and no error code was set, force one. */
944 if (!rc && GetLastError()==ERROR_SUCCESS)
946 SetLastError(ERROR_INVALID_DATA);
951 SetLastError(ERROR_SUCCESS);
953 TRACE_DATA_BLOB(pDataOut);
956 TRACE("returning %s\n", rc ? "ok" : "FAIL");
962 /***************************************************************************
963 * CryptUnprotectData [CRYPT32.@]
965 * Generate Plain data and Description from given Cipher and Entropy data.
968 * pDataIn [I] Cipher data to be decoded
969 * ppszDataDescr [O] Optional Unicode string describing the Plain data
970 * pOptionalEntropy [I] Optional entropy data to adjust cipher, can be NULL
971 * pvReserved [I] Reserved, must be NULL
972 * pPromptStruct [I] Structure describing if/how to prompt during decoding
973 * dwFlags [I] Flags describing options to the decoding
974 * pDataOut [O] Resulting Plain data, from calls to CryptProtectData
977 * TRUE If a Plain was generated.
978 * FALSE If something failed and no Plain is available.
981 * The true Windows encryption and keying mechanisms are unknown.
983 * dwFlags and pPromptStruct are currently ignored.
986 * Memory allocated in pDataOut and non-NULL ppszDataDescr must be freed
990 BOOL WINAPI CryptUnprotectData(DATA_BLOB* pDataIn,
991 LPWSTR * ppszDataDescr,
992 DATA_BLOB* pOptionalEntropy,
994 CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,
1001 struct protect_data_t protect_data;
1006 const char * announce_bad_opaque_data = "CryptUnprotectData received a DATA_BLOB that seems to have NOT been generated by Wine. Please enable tracing ('export WINEDEBUG=crypt') to see details.";
1010 SetLastError(ERROR_SUCCESS);
1012 if (!pDataIn || !pDataOut)
1014 SetLastError(ERROR_INVALID_PARAMETER);
1017 if (!pDataIn->cbData)
1019 SetLastError(ERROR_INVALID_DATA);
1023 /* debug: show our arguments */
1024 report(pDataIn,pOptionalEntropy,pPromptStruct,dwFlags);
1025 TRACE("\tppszDataDescr: %p\n", ppszDataDescr);
1027 /* take apart the opaque blob */
1028 if (!unserialize(pDataIn, &protect_data))
1030 SetLastError(ERROR_INVALID_DATA);
1031 FIXME("%s\n",announce_bad_opaque_data);
1035 /* perform basic validation on the resulting structure */
1036 if (!valid_protect_data(&protect_data))
1038 SetLastError(ERROR_INVALID_DATA);
1039 FIXME("%s\n",announce_bad_opaque_data);
1040 goto free_protect_data;
1043 /* get a crypt context */
1044 if (!CryptAcquireContextW(&hProv,NULL,MS_ENHANCED_PROV_W,CRYPT32_PROTECTDATA_PROV,CRYPT_VERIFYCONTEXT))
1046 ERR("CryptAcquireContextW failed\n");
1047 goto free_protect_data;
1051 if (!load_encryption_key(hProv,protect_data.cipher_key_len,&protect_data.salt,pOptionalEntropy,&hKey))
1056 /* create a hash for the decryption validation */
1057 if (!CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hHash))
1059 ERR("CryptCreateHash\n");
1063 /* prepare for plaintext */
1064 pDataOut->cbData=protect_data.cipher.cbData;
1065 if (!(pDataOut->pbData=LocalAlloc( LPTR, pDataOut->cbData)))
1067 ERR("CryptMemAlloc\n");
1070 memcpy(pDataOut->pbData,protect_data.cipher.pbData,protect_data.cipher.cbData);
1073 if (!CryptDecrypt(hKey, hHash, TRUE, 0, pDataOut->pbData,
1074 &pDataOut->cbData) ||
1075 /* check the hash fingerprint */
1076 pDataOut->cbData > protect_data.cipher.cbData ||
1077 !hash_matches_blob(hHash, &protect_data.fingerprint))
1079 SetLastError(ERROR_INVALID_DATA);
1081 LocalFree( pDataOut->pbData );
1082 pDataOut->pbData = NULL;
1083 pDataOut->cbData = 0;
1088 /* Copy out the description */
1089 dwLength = (lstrlenW(protect_data.szDataDescr)+1) * sizeof(WCHAR);
1092 if (!(*ppszDataDescr = LocalAlloc(LPTR,dwLength)))
1094 ERR("LocalAlloc (ppszDataDescr)\n");
1098 memcpy(*ppszDataDescr,protect_data.szDataDescr,dwLength);
1106 CryptDestroyHash(hHash);
1108 CryptDestroyKey(hKey);
1110 CryptReleaseContext(hProv,0);
1112 free_protect_data(&protect_data);
1114 /* If some error occurred, and no error code was set, force one. */
1115 if (!rc && GetLastError()==ERROR_SUCCESS)
1117 SetLastError(ERROR_INVALID_DATA);
1121 SetLastError(ERROR_SUCCESS);
1125 TRACE("szDataDescr: %s\n",debugstr_w(*ppszDataDescr));
1127 TRACE_DATA_BLOB(pDataOut);
1130 TRACE("returning %s\n", rc ? "ok" : "FAIL");