crypto.c@ 26688

Last change on this file since 26688 was 7299, checked in by vboxsync, 17 years ago
Added vboxconfig.h for linux builds.
Property svn:eol-style set to `native` Property svn:keywords set to `Date Revision Author Id`
File size: 19.1 KB

Line
1	#define IN_LIBEXSLT
2	#include "libexslt/libexslt.h"
3
4	#if defined(WIN32) && !defined (__CYGWIN__) && (!__MINGW32__)
5	#include <win32config.h>
6	#elif defined(VBOX)
7	#include "vboxconfig.h"
8	#else
9	#include "config.h"
10	#endif
11
12	#include <libxml/tree.h>
13	#include <libxml/xpath.h>
14	#include <libxml/xpathInternals.h>
15	#include <libxml/parser.h>
16	#include <libxml/encoding.h>
17	#include <libxml/uri.h>
18
19	#include <libxslt/xsltconfig.h>
20	#include <libxslt/xsltutils.h>
21	#include <libxslt/xsltInternals.h>
22	#include <libxslt/extensions.h>
23
24	#include "exslt.h"
25
26	#ifdef EXSLT_CRYPTO_ENABLED
27
28	#define HASH_DIGEST_LENGTH 32
29	#define MD5_DIGEST_LENGTH 16
30	#define SHA1_DIGEST_LENGTH 20
31
32	/* gcrypt rc4 can do 256 bit keys, but cryptoapi limit
33	seems to be 128 for the default provider */
34	#define RC4_KEY_LENGTH 128
35
36	/* The following routines have been declared static - this should be
37	reviewed to consider whether we want to expose them to the API
38	exsltCryptoBin2Hex
39	exsltCryptoHex2Bin
40	exsltCryptoGcryptInit
41	exsltCryptoGcryptHash
42	exsltCryptoGcryptRc4Encrypt
43	exsltCryptoGcryptRC4Decrypt
44	*/
45
46	/**
47	* exsltCryptoBin2Hex:
48	* @bin: binary blob to convert
49	* @binlen: length of binary blob
50	* @hex: buffer to store hex version of blob
51	* @hexlen: length of buffer to store hex version of blob
52	*
53	* Helper function which encodes a binary blob as hex.
54	*/
55	static void
56	exsltCryptoBin2Hex (const unsigned char *bin, int binlen,
57	unsigned char *hex, int hexlen) {
58	static const char bin2hex[] = { '0', '1', '2', '3',
59	'4', '5', '6', '7',
60	'8', '9', 'a', 'b',
61	'c', 'd', 'e', 'f'
62	};
63
64	unsigned char lo, hi;
65	int i, pos;
66	for (i = 0, pos = 0; (i < binlen && pos < hexlen); i++) {
67	lo = bin[i] & 0xf;
68	hi = bin[i] >> 4;
69	hex[pos++] = bin2hex[hi];
70	hex[pos++] = bin2hex[lo];
71	}
72
73	hex[pos] = '\0';
74	}
75
76	/**
77	* exsltCryptoHex2Bin:
78	* @hex: hex version of blob to convert
79	* @hexlen: length of hex buffer
80	* @bin: destination binary buffer
81	* @binlen: length of binary buffer
82	*
83	* Helper function which decodes a hex blob to binary
84	*/
85	static int
86	exsltCryptoHex2Bin (const unsigned char *hex, int hexlen,
87	unsigned char *bin, int binlen) {
88	int i = 0, j = 0;
89	unsigned char lo, hi, result, tmp;
90
91	while (i < hexlen && j < binlen) {
92	hi = lo = 0;
93
94	tmp = hex[i++];
95	if (tmp >= '0' && tmp <= '9')
96	hi = tmp - '0';
97	else if (tmp >= 'a' && tmp <= 'f')
98	hi = 10 + (tmp - 'a');
99
100	tmp = hex[i++];
101	if (tmp >= '0' && tmp <= '9')
102	lo = tmp - '0';
103	else if (tmp >= 'a' && tmp <= 'f')
104	lo = 10 + (tmp - 'a');
105
106	result = hi << 4;
107	result += lo;
108	bin[j++] = result;
109	}
110
111	return j;
112	}
113
114	#if defined(WIN32)
115
116	#define HAVE_CRYPTO
117	#define PLATFORM_HASH exsltCryptoCryptoApiHash
118	#define PLATFORM_RC4_ENCRYPT exsltCryptoCryptoApiRc4Encrypt
119	#define PLATFORM_RC4_DECRYPT exsltCryptoCryptoApiRc4Decrypt
120	#define PLATFORM_MD4 CALG_MD4
121	#define PLATFORM_MD5 CALG_MD5
122	#define PLATFORM_SHA1 CALG_SHA1
123
124	#include <windows.h>
125	#include <wincrypt.h>
126	#pragma comment(lib, "advapi32.lib")
127
128	static void
129	exsltCryptoCryptoApiReportError (xmlXPathParserContextPtr ctxt,
130	int line) {
131	LPVOID lpMsgBuf;
132	DWORD dw = GetLastError ();
133
134	FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER \|
135	FORMAT_MESSAGE_FROM_SYSTEM, NULL, dw,
136	MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
137	(LPTSTR) & lpMsgBuf, 0, NULL);
138
139	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL, NULL,
140	"exslt:crypto error (line %d). %s", line,
141	lpMsgBuf);
142	LocalFree (lpMsgBuf);
143	}
144
145	HCRYPTHASH
146	exsltCryptoCryptoApiCreateHash (xmlXPathParserContextPtr ctxt,
147	HCRYPTPROV hCryptProv, ALG_ID algorithm,
148	const char *msg, unsigned int msglen,
149	char *dest, unsigned int destlen)
150	{
151	HCRYPTHASH hHash = 0;
152	DWORD dwHashLen = destlen;
153
154	if (!CryptCreateHash (hCryptProv, algorithm, 0, 0, &hHash)) {
155	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
156	return 0;
157	}
158
159	if (!CryptHashData (hHash, (const BYTE *) msg, msglen, 0)) {
160	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
161	goto fail;
162	}
163
164	if (!CryptGetHashParam (hHash, HP_HASHVAL, dest, &dwHashLen, 0)) {
165	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
166	goto fail;
167	}
168
169	fail:
170	return hHash;
171	}
172
173	/**
174	* exsltCryptoCryptoApiHash:
175	* @ctxt: an XPath parser context
176	* @algorithm: hashing algorithm to use
177	* @msg: text to be hashed
178	* @msglen: length of text to be hashed
179	* @dest: buffer to place hash result
180	*
181	* Helper function which hashes a message using MD4, MD5, or SHA1.
182	* Uses Win32 CryptoAPI.
183	*/
184	static void
185	exsltCryptoCryptoApiHash (xmlXPathParserContextPtr ctxt,
186	ALG_ID algorithm, const char *msg,
187	unsigned long msglen,
188	char dest[HASH_DIGEST_LENGTH]) {
189	HCRYPTPROV hCryptProv;
190	HCRYPTHASH hHash;
191
192	if (!CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL,
193	CRYPT_VERIFYCONTEXT \| CRYPT_SILENT)) {
194	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
195	return;
196	}
197
198	hHash = exsltCryptoCryptoApiCreateHash (ctxt, hCryptProv,
199	algorithm, msg, msglen,
200	dest, HASH_DIGEST_LENGTH);
201	if (0 != hHash) {
202	CryptDestroyHash (hHash);
203	}
204
205	CryptReleaseContext (hCryptProv, 0);
206	}
207
208	void
209	exsltCryptoCryptoApiRc4Encrypt (xmlXPathParserContextPtr ctxt,
210	const unsigned char *key,
211	const unsigned char *msg, int msglen,
212	unsigned char *dest, int destlen) {
213	HCRYPTPROV hCryptProv;
214	HCRYPTKEY hKey;
215	HCRYPTHASH hHash;
216	DWORD dwDataLen;
217	unsigned char hash[HASH_DIGEST_LENGTH];
218
219	if (msglen > destlen) {
220	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
221	NULL,
222	"exslt:crypto : internal error exsltCryptoCryptoApiRc4Encrypt dest buffer too small.\n");
223	return;
224	}
225
226	if (!CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL,
227	CRYPT_VERIFYCONTEXT \| CRYPT_SILENT)) {
228	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
229	return;
230	}
231
232	hHash = exsltCryptoCryptoApiCreateHash (ctxt, hCryptProv,
233	CALG_SHA1, key,
234	RC4_KEY_LENGTH, hash,
235	HASH_DIGEST_LENGTH);
236
237	if (!CryptDeriveKey
238	(hCryptProv, CALG_RC4, hHash, 0x00800000, &hKey)) {
239	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
240	goto fail;
241	}
242	/* Now encrypt data. */
243	dwDataLen = msglen;
244	memcpy (dest, msg, msglen);
245	if (!CryptEncrypt (hKey, 0, TRUE, 0, dest, &dwDataLen, msglen)) {
246	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
247	goto fail;
248	}
249
250	fail:
251	if (0 != hHash) {
252	CryptDestroyHash (hHash);
253	}
254
255	CryptDestroyKey (hKey);
256	CryptReleaseContext (hCryptProv, 0);
257	}
258
259	void
260	exsltCryptoCryptoApiRc4Decrypt (xmlXPathParserContextPtr ctxt,
261	const unsigned char *key,
262	const unsigned char *msg, int msglen,
263	unsigned char *dest, int destlen) {
264	HCRYPTPROV hCryptProv;
265	HCRYPTKEY hKey;
266	HCRYPTHASH hHash;
267	DWORD dwDataLen;
268	unsigned char hash[HASH_DIGEST_LENGTH];
269
270	if (msglen > destlen) {
271	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
272	NULL,
273	"exslt:crypto : internal error exsltCryptoCryptoApiRc4Encrypt dest buffer too small.\n");
274	return;
275	}
276
277	if (!CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL,
278	CRYPT_VERIFYCONTEXT \| CRYPT_SILENT)) {
279	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
280	return;
281	}
282
283	hHash = exsltCryptoCryptoApiCreateHash (ctxt, hCryptProv,
284	CALG_SHA1, key,
285	RC4_KEY_LENGTH, hash,
286	HASH_DIGEST_LENGTH);
287
288	if (!CryptDeriveKey
289	(hCryptProv, CALG_RC4, hHash, 0x00800000, &hKey)) {
290	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
291	goto fail;
292	}
293	/* Now encrypt data. */
294	dwDataLen = msglen;
295	memcpy (dest, msg, msglen);
296	if (!CryptDecrypt (hKey, 0, TRUE, 0, dest, &dwDataLen)) {
297	exsltCryptoCryptoApiReportError (ctxt, __LINE__);
298	goto fail;
299	}
300
301	fail:
302	if (0 != hHash) {
303	CryptDestroyHash (hHash);
304	}
305
306	CryptDestroyKey (hKey);
307	CryptReleaseContext (hCryptProv, 0);
308	}
309
310	#endif /* defined(WIN32) */
311
312	#if defined(HAVE_GCRYPT)
313
314	#define HAVE_CRYPTO
315	#define PLATFORM_HASH exsltCryptoGcryptHash
316	#define PLATFORM_RC4_ENCRYPT exsltCryptoGcryptRc4Encrypt
317	#define PLATFORM_RC4_DECRYPT exsltCryptoGcryptRc4Decrypt
318	#define PLATFORM_MD4 GCRY_MD_MD4
319	#define PLATFORM_MD5 GCRY_MD_MD5
320	#define PLATFORM_SHA1 GCRY_MD_SHA1
321
322	#ifdef HAVE_SYS_TYPES_H
323	# include <sys/types.h>
324	#endif
325	#ifdef HAVE_STDINT_H
326	# include <stdint.h>
327	#endif
328
329	#ifdef HAVE_SYS_SELECT_H
330	#include <sys/select.h> /* needed by gcrypt.h 4 Jul 04 */
331	#endif
332	#include <gcrypt.h>
333
334	static void
335	exsltCryptoGcryptInit (void) {
336	static int gcrypt_init;
337	xmlLockLibrary ();
338
339	if (!gcrypt_init) {
340	/* The function `gcry_check_version' must be called before any other
341	function in the library, because it initializes the thread support
342	subsystem in Libgcrypt. To achieve this in all generality, it is
343	necessary to synchronize the call to this function with all other calls
344	to functions in the library, using the synchronization mechanisms
345	available in your thread library. (from gcrypt.info)
346	*/
347	gcry_check_version (GCRYPT_VERSION);
348	gcrypt_init = 1;
349	}
350
351	xmlUnlockLibrary ();
352	}
353
354	/**
355	* exsltCryptoGcryptHash:
356	* @ctxt: an XPath parser context
357	* @algorithm: hashing algorithm to use
358	* @msg: text to be hashed
359	* @msglen: length of text to be hashed
360	* @dest: buffer to place hash result
361	*
362	* Helper function which hashes a message using MD4, MD5, or SHA1.
363	* using gcrypt
364	*/
365	static void
366	exsltCryptoGcryptHash (xmlXPathParserContextPtr ctxt ATTRIBUTE_UNUSED,
367	/* changed the enum to int */
368	int algorithm, const char *msg,
369	unsigned long msglen,
370	char dest[HASH_DIGEST_LENGTH]) {
371	exsltCryptoGcryptInit ();
372	gcry_md_hash_buffer (algorithm, dest, msg, msglen);
373	}
374
375	static void
376	exsltCryptoGcryptRc4Encrypt (xmlXPathParserContextPtr ctxt,
377	const unsigned char *key,
378	const unsigned char *msg, int msglen,
379	unsigned char *dest, int destlen) {
380	gcry_cipher_hd_t cipher;
381	gcry_error_t rc = 0;
382
383	exsltCryptoGcryptInit ();
384
385	rc = gcry_cipher_open (&cipher, GCRY_CIPHER_ARCFOUR,
386	GCRY_CIPHER_MODE_STREAM, 0);
387	if (rc) {
388	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
389	NULL,
390	"exslt:crypto internal error %s (gcry_cipher_open)\n",
391	gcry_strerror (rc));
392	}
393
394	rc = gcry_cipher_setkey (cipher, key, RC4_KEY_LENGTH);
395	if (rc) {
396	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
397	NULL,
398	"exslt:crypto internal error %s (gcry_cipher_setkey)\n",
399	gcry_strerror (rc));
400	}
401
402	rc = gcry_cipher_encrypt (cipher, (unsigned char *) dest, destlen,
403	(const unsigned char *) msg, msglen);
404	if (rc) {
405	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
406	NULL,
407	"exslt:crypto internal error %s (gcry_cipher_encrypt)\n",
408	gcry_strerror (rc));
409	}
410
411	gcry_cipher_close (cipher);
412	}
413
414	static void
415	exsltCryptoGcryptRc4Decrypt (xmlXPathParserContextPtr ctxt,
416	const unsigned char *key,
417	const unsigned char *msg, int msglen,
418	unsigned char *dest, int destlen) {
419	gcry_cipher_hd_t cipher;
420	gcry_error_t rc = 0;
421
422	exsltCryptoGcryptInit ();
423
424	rc = gcry_cipher_open (&cipher, GCRY_CIPHER_ARCFOUR,
425	GCRY_CIPHER_MODE_STREAM, 0);
426	if (rc) {
427	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
428	NULL,
429	"exslt:crypto internal error %s (gcry_cipher_open)\n",
430	gcry_strerror (rc));
431	}
432
433	rc = gcry_cipher_setkey (cipher, key, RC4_KEY_LENGTH);
434	if (rc) {
435	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
436	NULL,
437	"exslt:crypto internal error %s (gcry_cipher_setkey)\n",
438	gcry_strerror (rc));
439	}
440
441	rc = gcry_cipher_decrypt (cipher, (unsigned char *) dest, destlen,
442	(const unsigned char *) msg, msglen);
443	if (rc) {
444	xsltTransformError (xsltXPathGetTransformContext (ctxt), NULL,
445	NULL,
446	"exslt:crypto internal error %s (gcry_cipher_decrypt)\n",
447	gcry_strerror (rc));
448	}
449
450	gcry_cipher_close (cipher);
451	}
452
453	#endif /* defined(HAVE_GCRYPT) */
454
455	#if defined(HAVE_CRYPTO)
456
457	/**
458	* exsltCryptoPopString:
459	* @ctxt: an XPath parser context
460	* @nargs: the number of arguments
461	*
462	* Helper function which checks for and returns first string argument and its length
463	*/
464	static int
465	exsltCryptoPopString (xmlXPathParserContextPtr ctxt, int nargs,
466	xmlChar ** str) {
467
468	int str_len = 0;
469
470	if ((nargs < 1) \|\| (nargs > 2)) {
471	xmlXPathSetArityError (ctxt);
472	return 0;
473	}
474
475	*str = xmlXPathPopString (ctxt);
476	str_len = xmlUTF8Strlen (*str);
477
478	if (str_len == 0) {
479	xmlXPathReturnEmptyString (ctxt);
480	xmlFree (*str);
481	return 0;
482	}
483
484	return str_len;
485	}
486
487	/**
488	* exsltCryptoMd4Function:
489	* @ctxt: an XPath parser context
490	* @nargs: the number of arguments
491	*
492	* computes the md4 hash of a string and returns as hex
493	*/
494	static void
495	exsltCryptoMd4Function (xmlXPathParserContextPtr ctxt, int nargs) {
496
497	int str_len = 0;
498	xmlChar str = NULL, ret = NULL;
499	unsigned char hash[HASH_DIGEST_LENGTH];
500	unsigned char hex[MD5_DIGEST_LENGTH * 2 + 1];
501
502	str_len = exsltCryptoPopString (ctxt, nargs, &str);
503	if (str_len == 0) {
504	xmlXPathReturnEmptyString (ctxt);
505	xmlFree (str);
506	return;
507	}
508
509	PLATFORM_HASH (ctxt, PLATFORM_MD4, (const char *) str, str_len,
510	(char *) hash);
511	exsltCryptoBin2Hex (hash, sizeof (hash) - 1, hex, sizeof (hex) - 1);
512
513	ret = xmlStrdup ((xmlChar *) hex);
514	xmlXPathReturnString (ctxt, ret);
515
516	if (str != NULL)
517	xmlFree (str);
518	}
519
520	/**
521	* exsltCryptoMd5Function:
522	* @ctxt: an XPath parser context
523	* @nargs: the number of arguments
524	*
525	* computes the md5 hash of a string and returns as hex
526	*/
527	static void
528	exsltCryptoMd5Function (xmlXPathParserContextPtr ctxt, int nargs) {
529
530	int str_len = 0;
531	xmlChar str = NULL, ret = NULL;
532	unsigned char hash[HASH_DIGEST_LENGTH];
533	unsigned char hex[MD5_DIGEST_LENGTH * 2 + 1];
534
535	str_len = exsltCryptoPopString (ctxt, nargs, &str);
536	if (str_len == 0) {
537	xmlXPathReturnEmptyString (ctxt);
538	xmlFree (str);
539	return;
540	}
541
542	PLATFORM_HASH (ctxt, PLATFORM_MD5, (const char *) str, str_len,
543	(char *) hash);
544	exsltCryptoBin2Hex (hash, sizeof (hash) - 1, hex, sizeof (hex) - 1);
545
546	ret = xmlStrdup ((xmlChar *) hex);
547	xmlXPathReturnString (ctxt, ret);
548
549	if (str != NULL)
550	xmlFree (str);
551	}
552
553	/**
554	* exsltCryptoSha1Function:
555	* @ctxt: an XPath parser context
556	* @nargs: the number of arguments
557	*
558	* computes the sha1 hash of a string and returns as hex
559	*/
560	static void
561	exsltCryptoSha1Function (xmlXPathParserContextPtr ctxt, int nargs) {
562
563	int str_len = 0;
564	xmlChar str = NULL, ret = NULL;
565	unsigned char hash[HASH_DIGEST_LENGTH];
566	unsigned char hex[SHA1_DIGEST_LENGTH * 2 + 1];
567
568	str_len = exsltCryptoPopString (ctxt, nargs, &str);
569	if (str_len == 0) {
570	xmlXPathReturnEmptyString (ctxt);
571	xmlFree (str);
572	return;
573	}
574
575	PLATFORM_HASH (ctxt, PLATFORM_SHA1, (const char *) str, str_len,
576	(char *) hash);
577	exsltCryptoBin2Hex (hash, sizeof (hash) - 1, hex, sizeof (hex) - 1);
578
579	ret = xmlStrdup ((xmlChar *) hex);
580	xmlXPathReturnString (ctxt, ret);
581
582	if (str != NULL)
583	xmlFree (str);
584	}
585
586	/**
587	* exsltCryptoRc4EncryptFunction:
588	* @ctxt: an XPath parser context
589	* @nargs: the number of arguments
590	*
591	* computes the sha1 hash of a string and returns as hex
592	*/
593	static void
594	exsltCryptoRc4EncryptFunction (xmlXPathParserContextPtr ctxt, int nargs) {
595
596	int key_len = 0, key_size = 0;
597	int str_len = 0, bin_len = 0, hex_len = 0;
598	xmlChar key = NULL, str = NULL, *padkey = NULL;
599	xmlChar bin = NULL, hex = NULL;
600
601	if ((nargs < 1) \|\| (nargs > 3)) {
602	xmlXPathSetArityError (ctxt);
603	return;
604	}
605
606	str = xmlXPathPopString (ctxt);
607	str_len = xmlUTF8Strlen (str);
608
609	if (str_len == 0) {
610	xmlXPathReturnEmptyString (ctxt);
611	xmlFree (str);
612	return;
613	}
614
615	key = xmlXPathPopString (ctxt);
616	key_len = xmlUTF8Strlen (str);
617
618	if (key_len == 0) {
619	xmlXPathReturnEmptyString (ctxt);
620	xmlFree (key);
621	xmlFree (str);
622	return;
623	}
624
625	padkey = xmlMallocAtomic (RC4_KEY_LENGTH);
626	key_size = xmlUTF8Strsize (key, key_len);
627	memcpy (padkey, key, key_size);
628	memset (padkey + key_size, '\0', sizeof (padkey));
629
630	/* encrypt it */
631	bin_len = str_len;
632	bin = xmlStrdup (str);
633	if (bin == NULL) {
634	xmlXPathReturnEmptyString (ctxt);
635	goto done;
636	}
637	PLATFORM_RC4_ENCRYPT (ctxt, padkey, str, str_len, bin, bin_len);
638
639	/* encode it */
640	hex_len = str_len * 2 + 1;
641	hex = xmlMallocAtomic (hex_len);
642	if (hex == NULL) {
643	xmlXPathReturnEmptyString (ctxt);
644	goto done;
645	}
646
647	exsltCryptoBin2Hex (bin, str_len, hex, hex_len);
648	xmlXPathReturnString (ctxt, hex);
649
650	done:
651	if (key != NULL)
652	xmlFree (key);
653	if (str != NULL)
654	xmlFree (str);
655	if (padkey != NULL)
656	xmlFree (padkey);
657	if (bin != NULL)
658	xmlFree (bin);
659	}
660
661	/**
662	* exsltCryptoRc4DecryptFunction:
663	* @ctxt: an XPath parser context
664	* @nargs: the number of arguments
665	*
666	* computes the sha1 hash of a string and returns as hex
667	*/
668	static void
669	exsltCryptoRc4DecryptFunction (xmlXPathParserContextPtr ctxt, int nargs) {
670
671	int key_len = 0, key_size = 0;
672	int str_len = 0, bin_len = 0, ret_len = 0;
673	xmlChar key = NULL, str = NULL, padkey = NULL, bin =
674	NULL, *ret = NULL;
675
676	if ((nargs < 1) \|\| (nargs > 3)) {
677	xmlXPathSetArityError (ctxt);
678	return;
679	}
680
681	str = xmlXPathPopString (ctxt);
682	str_len = xmlUTF8Strlen (str);
683
684	if (str_len == 0) {
685	xmlXPathReturnEmptyString (ctxt);
686	xmlFree (str);
687	return;
688	}
689
690	key = xmlXPathPopString (ctxt);
691	key_len = xmlUTF8Strlen (str);
692
693	if (key_len == 0) {
694	xmlXPathReturnEmptyString (ctxt);
695	xmlFree (key);
696	xmlFree (str);
697	return;
698	}
699
700	padkey = xmlMallocAtomic (RC4_KEY_LENGTH);
701	key_size = xmlUTF8Strsize (key, key_len);
702	memcpy (padkey, key, key_size);
703	memset (padkey + key_size, '\0', sizeof (padkey));
704
705	/* decode hex to binary */
706	bin_len = str_len;
707	bin = xmlMallocAtomic (bin_len);
708	ret_len = exsltCryptoHex2Bin (str, str_len, bin, bin_len);
709
710	/* decrypt the binary blob */
711	ret = xmlMallocAtomic (ret_len);
712	PLATFORM_RC4_DECRYPT (ctxt, padkey, bin, ret_len, ret, ret_len);
713
714	xmlXPathReturnString (ctxt, ret);
715
716	if (key != NULL)
717	xmlFree (key);
718	if (str != NULL)
719	xmlFree (str);
720	if (padkey != NULL)
721	xmlFree (padkey);
722	if (bin != NULL)
723	xmlFree (bin);
724	}
725
726	/**
727	* exsltCryptoRegister:
728	*
729	* Registers the EXSLT - Crypto module
730	*/
731
732	void
733	exsltCryptoRegister (void) {
734	xsltRegisterExtModuleFunction ((const xmlChar *) "md4",
735	EXSLT_CRYPTO_NAMESPACE,
736	exsltCryptoMd4Function);
737	xsltRegisterExtModuleFunction ((const xmlChar *) "md5",
738	EXSLT_CRYPTO_NAMESPACE,
739	exsltCryptoMd5Function);
740	xsltRegisterExtModuleFunction ((const xmlChar *) "sha1",
741	EXSLT_CRYPTO_NAMESPACE,
742	exsltCryptoSha1Function);
743	xsltRegisterExtModuleFunction ((const xmlChar *) "rc4_encrypt",
744	EXSLT_CRYPTO_NAMESPACE,
745	exsltCryptoRc4EncryptFunction);
746	xsltRegisterExtModuleFunction ((const xmlChar *) "rc4_decrypt",
747	EXSLT_CRYPTO_NAMESPACE,
748	exsltCryptoRc4DecryptFunction);
749	}
750
751	#else
752	void
753	exsltCryptoRegister (void) {
754	}
755
756	#endif /* defined(HAVE_CRYPTO) */
757
758	#endif /* EXSLT_CRYPTO_ENABLED */

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source: vbox/trunk/src/libs/libxslt-1.1.22/libexslt/crypto.c@ 26688

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