archive_cryptor.c revision 358090 
1/*-
2* Copyright (c) 2014 Michihiro NAKAJIMA
3* All rights reserved.
4*
5* Redistribution and use in source and binary forms, with or without
6* modification, are permitted provided that the following conditions
7* are met:
8* 1. Redistributions of source code must retain the above copyright
9*    notice, this list of conditions and the following disclaimer.
10* 2. Redistributions in binary form must reproduce the above copyright
11*    notice, this list of conditions and the following disclaimer in the
12*    documentation and/or other materials provided with the distribution.
13*
14* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24*/
25
26#include "archive_platform.h"
27
28#ifdef HAVE_STRING_H
29#include <string.h>
30#endif
31#include "archive.h"
32#include "archive_cryptor_private.h"
33
34/*
35 * On systems that do not support any recognized crypto libraries,
36 * this file will normally define no usable symbols.
37 *
38 * But some compilers and linkers choke on empty object files, so
39 * define a public symbol that will always exist.  This could
40 * be removed someday if this file gains another always-present
41 * symbol definition.
42 */
43int __libarchive_cryptor_build_hack(void) {
44	return 0;
45}
46
47#ifdef ARCHIVE_CRYPTOR_USE_Apple_CommonCrypto
48
49static int
50pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
51    size_t salt_len, unsigned rounds, uint8_t *derived_key,
52    size_t derived_key_len)
53{
54	CCKeyDerivationPBKDF(kCCPBKDF2, (const char *)pw,
55	    pw_len, salt, salt_len, kCCPRFHmacAlgSHA1, rounds,
56	    derived_key, derived_key_len);
57	return 0;
58}
59
60#elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)
61#ifdef _MSC_VER
62#pragma comment(lib, "Bcrypt.lib")
63#endif
64
65static int
66pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
67	size_t salt_len, unsigned rounds, uint8_t *derived_key,
68	size_t derived_key_len)
69{
70	NTSTATUS status;
71	BCRYPT_ALG_HANDLE hAlg;
72
73	status = BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_SHA1_ALGORITHM,
74		MS_PRIMITIVE_PROVIDER, BCRYPT_ALG_HANDLE_HMAC_FLAG);
75	if (!BCRYPT_SUCCESS(status))
76		return -1;
77
78	status = BCryptDeriveKeyPBKDF2(hAlg,
79		(PUCHAR)(uintptr_t)pw, (ULONG)pw_len,
80		(PUCHAR)(uintptr_t)salt, (ULONG)salt_len, rounds,
81		(PUCHAR)derived_key, (ULONG)derived_key_len, 0);
82
83	BCryptCloseAlgorithmProvider(hAlg, 0);
84
85	return (BCRYPT_SUCCESS(status)) ? 0: -1;
86}
87
88#elif defined(HAVE_LIBMBEDCRYPTO) && defined(HAVE_MBEDTLS_PKCS5_H)
89
90static int
91pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
92    size_t salt_len, unsigned rounds, uint8_t *derived_key,
93    size_t derived_key_len)
94{
95	mbedtls_md_context_t ctx;
96	const mbedtls_md_info_t *info;
97	int ret;
98
99	mbedtls_md_init(&ctx);
100	info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
101	if (info == NULL) {
102		mbedtls_md_free(&ctx);
103		return (-1);
104	}
105	ret = mbedtls_md_setup(&ctx, info, 1);
106	if (ret != 0) {
107		mbedtls_md_free(&ctx);
108		return (-1);
109	}
110	ret = mbedtls_pkcs5_pbkdf2_hmac(&ctx, (const unsigned char *)pw,
111	    pw_len, salt, salt_len, rounds, derived_key_len, derived_key);
112
113	mbedtls_md_free(&ctx);
114	return (ret);
115}
116
117#elif defined(HAVE_LIBNETTLE) && defined(HAVE_NETTLE_PBKDF2_H)
118
119static int
120pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
121    size_t salt_len, unsigned rounds, uint8_t *derived_key,
122    size_t derived_key_len) {
123	pbkdf2_hmac_sha1((unsigned)pw_len, (const uint8_t *)pw, rounds,
124	    salt_len, salt, derived_key_len, derived_key);
125	return 0;
126}
127
128#elif defined(HAVE_LIBCRYPTO) && defined(HAVE_PKCS5_PBKDF2_HMAC_SHA1)
129
130static int
131pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
132    size_t salt_len, unsigned rounds, uint8_t *derived_key,
133    size_t derived_key_len) {
134
135	PKCS5_PBKDF2_HMAC_SHA1(pw, pw_len, salt, salt_len, rounds,
136	    derived_key_len, derived_key);
137	return 0;
138}
139
140#else
141
142/* Stub */
143static int
144pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
145    size_t salt_len, unsigned rounds, uint8_t *derived_key,
146    size_t derived_key_len) {
147	(void)pw; /* UNUSED */
148	(void)pw_len; /* UNUSED */
149	(void)salt; /* UNUSED */
150	(void)salt_len; /* UNUSED */
151	(void)rounds; /* UNUSED */
152	(void)derived_key; /* UNUSED */
153	(void)derived_key_len; /* UNUSED */
154	return -1; /* UNSUPPORTED */
155}
156
157#endif
158
159#ifdef ARCHIVE_CRYPTOR_USE_Apple_CommonCrypto
160# if MAC_OS_X_VERSION_MAX_ALLOWED < 1090
161#  define kCCAlgorithmAES kCCAlgorithmAES128
162# endif
163
164static int
165aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
166{
167	CCCryptorStatus r;
168
169	ctx->key_len = key_len;
170	memcpy(ctx->key, key, key_len);
171	memset(ctx->nonce, 0, sizeof(ctx->nonce));
172	ctx->encr_pos = AES_BLOCK_SIZE;
173	r = CCCryptorCreateWithMode(kCCEncrypt, kCCModeECB, kCCAlgorithmAES,
174	    ccNoPadding, NULL, key, key_len, NULL, 0, 0, 0, &ctx->ctx);
175	return (r == kCCSuccess)? 0: -1;
176}
177
178static int
179aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
180{
181	CCCryptorRef ref = ctx->ctx;
182	CCCryptorStatus r;
183
184	r = CCCryptorReset(ref, NULL);
185	if (r != kCCSuccess && r != kCCUnimplemented)
186		return -1;
187	r = CCCryptorUpdate(ref, ctx->nonce, AES_BLOCK_SIZE, ctx->encr_buf,
188	    AES_BLOCK_SIZE, NULL);
189	return (r == kCCSuccess)? 0: -1;
190}
191
192static int
193aes_ctr_release(archive_crypto_ctx *ctx)
194{
195	memset(ctx->key, 0, ctx->key_len);
196	memset(ctx->nonce, 0, sizeof(ctx->nonce));
197	return 0;
198}
199
200#elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)
201
202static int
203aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
204{
205	BCRYPT_ALG_HANDLE hAlg;
206	BCRYPT_KEY_HANDLE hKey;
207	DWORD keyObj_len, aes_key_len;
208	PBYTE keyObj;
209	ULONG result;
210	NTSTATUS status;
211	BCRYPT_KEY_LENGTHS_STRUCT key_lengths;
212
213	ctx->hAlg = NULL;
214	ctx->hKey = NULL;
215	ctx->keyObj = NULL;
216	switch (key_len) {
217	case 16: aes_key_len = 128; break;
218	case 24: aes_key_len = 192; break;
219	case 32: aes_key_len = 256; break;
220	default: return -1;
221	}
222	status = BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_AES_ALGORITHM,
223		MS_PRIMITIVE_PROVIDER, 0);
224	if (!BCRYPT_SUCCESS(status))
225		return -1;
226	status = BCryptGetProperty(hAlg, BCRYPT_KEY_LENGTHS, (PUCHAR)&key_lengths,
227		sizeof(key_lengths), &result, 0);
228	if (!BCRYPT_SUCCESS(status)) {
229		BCryptCloseAlgorithmProvider(hAlg, 0);
230		return -1;
231	}
232	if (key_lengths.dwMinLength > aes_key_len
233		|| key_lengths.dwMaxLength < aes_key_len) {
234		BCryptCloseAlgorithmProvider(hAlg, 0);
235		return -1;
236	}
237	status = BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH, (PUCHAR)&keyObj_len,
238		sizeof(keyObj_len), &result, 0);
239	if (!BCRYPT_SUCCESS(status)) {
240		BCryptCloseAlgorithmProvider(hAlg, 0);
241		return -1;
242	}
243	keyObj = (PBYTE)HeapAlloc(GetProcessHeap(), 0, keyObj_len);
244	if (keyObj == NULL) {
245		BCryptCloseAlgorithmProvider(hAlg, 0);
246		return -1;
247	}
248	status = BCryptSetProperty(hAlg, BCRYPT_CHAINING_MODE,
249		(PUCHAR)BCRYPT_CHAIN_MODE_ECB, sizeof(BCRYPT_CHAIN_MODE_ECB), 0);
250	if (!BCRYPT_SUCCESS(status)) {
251		BCryptCloseAlgorithmProvider(hAlg, 0);
252		HeapFree(GetProcessHeap(), 0, keyObj);
253		return -1;
254	}
255	status = BCryptGenerateSymmetricKey(hAlg, &hKey,
256		keyObj, keyObj_len,
257		(PUCHAR)(uintptr_t)key, (ULONG)key_len, 0);
258	if (!BCRYPT_SUCCESS(status)) {
259		BCryptCloseAlgorithmProvider(hAlg, 0);
260		HeapFree(GetProcessHeap(), 0, keyObj);
261		return -1;
262	}
263
264	ctx->hAlg = hAlg;
265	ctx->hKey = hKey;
266	ctx->keyObj = keyObj;
267	ctx->keyObj_len = keyObj_len;
268	ctx->encr_pos = AES_BLOCK_SIZE;
269
270	return 0;
271}
272
273static int
274aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
275{
276	NTSTATUS status;
277	ULONG result;
278
279	status = BCryptEncrypt(ctx->hKey, (PUCHAR)ctx->nonce, AES_BLOCK_SIZE,
280		NULL, NULL, 0, (PUCHAR)ctx->encr_buf, AES_BLOCK_SIZE,
281		&result, 0);
282	return BCRYPT_SUCCESS(status) ? 0 : -1;
283}
284
285static int
286aes_ctr_release(archive_crypto_ctx *ctx)
287{
288
289	if (ctx->hAlg != NULL) {
290		BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
291		ctx->hAlg = NULL;
292		BCryptDestroyKey(ctx->hKey);
293		ctx->hKey = NULL;
294		HeapFree(GetProcessHeap(), 0, ctx->keyObj);
295		ctx->keyObj = NULL;
296	}
297	memset(ctx, 0, sizeof(*ctx));
298	return 0;
299}
300
301#elif defined(HAVE_LIBMBEDCRYPTO) && defined(HAVE_MBEDTLS_AES_H)
302
303static int
304aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
305{
306	mbedtls_aes_init(&ctx->ctx);
307	ctx->key_len = key_len;
308	memcpy(ctx->key, key, key_len);
309	memset(ctx->nonce, 0, sizeof(ctx->nonce));
310	ctx->encr_pos = AES_BLOCK_SIZE;
311	return 0;
312}
313
314static int
315aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
316{
317	if (mbedtls_aes_setkey_enc(&ctx->ctx, ctx->key,
318	    ctx->key_len * 8) != 0)
319		return (-1);
320	if (mbedtls_aes_crypt_ecb(&ctx->ctx, MBEDTLS_AES_ENCRYPT, ctx->nonce,
321	    ctx->encr_buf) != 0)
322		return (-1);
323	return 0;
324}
325
326static int
327aes_ctr_release(archive_crypto_ctx *ctx)
328{
329	mbedtls_aes_free(&ctx->ctx);
330	memset(ctx, 0, sizeof(*ctx));
331	return 0;
332}
333
334#elif defined(HAVE_LIBNETTLE) && defined(HAVE_NETTLE_AES_H)
335
336static int
337aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
338{
339	ctx->key_len = key_len;
340	memcpy(ctx->key, key, key_len);
341	memset(ctx->nonce, 0, sizeof(ctx->nonce));
342	ctx->encr_pos = AES_BLOCK_SIZE;
343	memset(&ctx->ctx, 0, sizeof(ctx->ctx));
344	return 0;
345}
346
347static int
348aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
349{
350	aes_set_encrypt_key(&ctx->ctx, ctx->key_len, ctx->key);
351	aes_encrypt(&ctx->ctx, AES_BLOCK_SIZE, ctx->encr_buf, ctx->nonce);
352	return 0;
353}
354
355static int
356aes_ctr_release(archive_crypto_ctx *ctx)
357{
358	memset(ctx, 0, sizeof(*ctx));
359	return 0;
360}
361
362#elif defined(HAVE_LIBCRYPTO)
363
364static int
365aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
366{
367	if ((ctx->ctx = EVP_CIPHER_CTX_new()) == NULL)
368		return -1;
369
370	switch (key_len) {
371	case 16: ctx->type = EVP_aes_128_ecb(); break;
372	case 24: ctx->type = EVP_aes_192_ecb(); break;
373	case 32: ctx->type = EVP_aes_256_ecb(); break;
374	default: ctx->type = NULL; return -1;
375	}
376
377	ctx->key_len = key_len;
378	memcpy(ctx->key, key, key_len);
379	memset(ctx->nonce, 0, sizeof(ctx->nonce));
380	ctx->encr_pos = AES_BLOCK_SIZE;
381#if OPENSSL_VERSION_NUMBER  >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
382	if (!EVP_CIPHER_CTX_reset(ctx->ctx)) {
383		EVP_CIPHER_CTX_free(ctx->ctx);
384		ctx->ctx = NULL;
385	}
386#else
387	EVP_CIPHER_CTX_init(ctx->ctx);
388#endif
389	return 0;
390}
391
392static int
393aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
394{
395	int outl = 0;
396	int r;
397
398	r = EVP_EncryptInit_ex(ctx->ctx, ctx->type, NULL, ctx->key, NULL);
399	if (r == 0)
400		return -1;
401	r = EVP_EncryptUpdate(ctx->ctx, ctx->encr_buf, &outl, ctx->nonce,
402	    AES_BLOCK_SIZE);
403	if (r == 0 || outl != AES_BLOCK_SIZE)
404		return -1;
405	return 0;
406}
407
408static int
409aes_ctr_release(archive_crypto_ctx *ctx)
410{
411	EVP_CIPHER_CTX_free(ctx->ctx);
412	memset(ctx->key, 0, ctx->key_len);
413	memset(ctx->nonce, 0, sizeof(ctx->nonce));
414	return 0;
415}
416
417#else
418
419#define ARCHIVE_CRYPTOR_STUB
420/* Stub */
421static int
422aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
423{
424	(void)ctx; /* UNUSED */
425	(void)key; /* UNUSED */
426	(void)key_len; /* UNUSED */
427	return -1;
428}
429
430static int
431aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
432{
433	(void)ctx; /* UNUSED */
434	return -1;
435}
436
437static int
438aes_ctr_release(archive_crypto_ctx *ctx)
439{
440	(void)ctx; /* UNUSED */
441	return 0;
442}
443
444#endif
445
446#ifdef ARCHIVE_CRYPTOR_STUB
447static int
448aes_ctr_update(archive_crypto_ctx *ctx, const uint8_t * const in,
449    size_t in_len, uint8_t * const out, size_t *out_len)
450{
451	(void)ctx; /* UNUSED */
452	(void)in; /* UNUSED */
453	(void)in_len; /* UNUSED */
454	(void)out; /* UNUSED */
455	(void)out_len; /* UNUSED */
456	aes_ctr_encrypt_counter(ctx); /* UNUSED */ /* Fix unused function warning */
457	return -1;
458}
459
460#else
461static void
462aes_ctr_increase_counter(archive_crypto_ctx *ctx)
463{
464	uint8_t *const nonce = ctx->nonce;
465	int j;
466
467	for (j = 0; j < 8; j++) {
468		if (++nonce[j])
469			break;
470	}
471}
472
473static int
474aes_ctr_update(archive_crypto_ctx *ctx, const uint8_t * const in,
475    size_t in_len, uint8_t * const out, size_t *out_len)
476{
477	uint8_t *const ebuf = ctx->encr_buf;
478	unsigned pos = ctx->encr_pos;
479	unsigned max = (unsigned)((in_len < *out_len)? in_len: *out_len);
480	unsigned i;
481
482	for (i = 0; i < max; ) {
483		if (pos == AES_BLOCK_SIZE) {
484			aes_ctr_increase_counter(ctx);
485			if (aes_ctr_encrypt_counter(ctx) != 0)
486				return -1;
487			while (max -i >= AES_BLOCK_SIZE) {
488				for (pos = 0; pos < AES_BLOCK_SIZE; pos++)
489					out[i+pos] = in[i+pos] ^ ebuf[pos];
490				i += AES_BLOCK_SIZE;
491				aes_ctr_increase_counter(ctx);
492				if (aes_ctr_encrypt_counter(ctx) != 0)
493					return -1;
494			}
495			pos = 0;
496			if (i >= max)
497				break;
498		}
499		out[i] = in[i] ^ ebuf[pos++];
500		i++;
501	}
502	ctx->encr_pos = pos;
503	*out_len = i;
504
505	return 0;
506}
507#endif /* ARCHIVE_CRYPTOR_STUB */
508
509
510const struct archive_cryptor __archive_cryptor =
511{
512  &pbkdf2_sha1,
513  &aes_ctr_init,
514  &aes_ctr_update,
515  &aes_ctr_release,
516  &aes_ctr_init,
517  &aes_ctr_update,
518  &aes_ctr_release,
519};
520