Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
/*
 * Copyright (c) 2016 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/* Sample to illustrate the usage of crypto APIs. The sample plaintext
 * and ciphertexts used for crosschecking are from TinyCrypt.
 */

#include <device.h>
#include <zephyr.h>
#include <string.h>
#include <crypto/cipher.h>

#define SYS_LOG_LEVEL CONFIG_SYS_LOG_CRYPTO_LEVEL
#include <logging/sys_log.h>

#ifdef CONFIG_CRYPTO_TINYCRYPT_SHIM
#define CRYPTO_DRV_NAME CONFIG_CRYPTO_TINYCRYPT_SHIM_DRV_NAME
#elif CONFIG_CRYPTO_MBEDTLS_SHIM
#define CRYPTO_DRV_NAME CONFIG_CRYPTO_MBEDTLS_SHIM_DRV_NAME
#else
#error "You need to enable one crypto device"
#endif

u8_t key[16] = {
	0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88,
	0x09, 0xcf, 0x4f, 0x3c
};
u8_t iv[16] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
	0x0c, 0x0d, 0x0e, 0x0f
};
u8_t plaintext[64] = {
	0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11,
	0x73, 0x93, 0x17, 0x2a, 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
	0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, 0x30, 0xc8, 0x1c, 0x46,
	0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
	0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b,
	0xe6, 0x6c, 0x37, 0x10
};
u8_t ciphertext[80] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
	0x0c, 0x0d, 0x0e, 0x0f, 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46,
	0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, 0x50, 0x86, 0xcb, 0x9b,
	0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2,
	0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e,
	0x22, 0x22, 0x95, 0x16, 0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09,
	0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7
};

u32_t cap_flags;

static void print_buffer_comparison(u8_t *wanted_result,
				    u8_t *result, size_t length)
{
	int i, j;

	printk("Was waiting for: \n");

	for (i = 0, j = 1; i < length; i++, j++) {
		printk("0x%02x ", wanted_result[i]);

		if (j == 10) {
			printk("\n");
			j = 0;
		}
	}

	printk("\n But got:\n");

	for (i = 0, j = 1; i < length; i++, j++) {
		printk("0x%02x ", result[i]);

		if (j == 10) {
			printk("\n");
			j = 0;
		}
	}

	printk("\n");
}

int validate_hw_compatibility(struct device *dev)
{
	u32_t flags = 0;

	flags = cipher_query_hwcaps(dev);
	if ((flags & CAP_RAW_KEY) == 0) {
		SYS_LOG_INF(" Please provision the key separately "
			"as the module doesnt support a raw key");
		return -1;
	}

	if ((flags & CAP_SYNC_OPS) == 0) {
		SYS_LOG_ERR("The app assumes sync semantics. "
		  "Please rewrite the app accordingly before proceeding");
		return -1;
	}

	if ((flags & CAP_SEPARATE_IO_BUFS) == 0) {
		SYS_LOG_ERR("The app assumes distinct IO buffers. "
		"Please rewrite the app accordingly before proceeding");
		return -1;
	}

	cap_flags = CAP_RAW_KEY | CAP_SYNC_OPS | CAP_SEPARATE_IO_BUFS;

	return 0;

}

void cbc_mode(void)
{
	struct device *dev;
	struct cipher_ctx ini;
	struct cipher_pkt encrypt;
	struct cipher_pkt decrypt;
	u8_t encrypted[80];
	u8_t decrypted[64];

	SYS_LOG_INF("CBC Mode");

	dev = device_get_binding(CRYPTO_DRV_NAME);
	if (!dev) {
		SYS_LOG_ERR("%s pseudo device not found", CRYPTO_DRV_NAME);
		return;
	}

	if (validate_hw_compatibility(dev)) {
		SYS_LOG_ERR("Incompatible h/w");
		return;
	}

	ini.keylen = 16;
	ini.key.bit_stream = key;
	ini.flags =  cap_flags;

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CBC,
				 CRYPTO_CIPHER_OP_ENCRYPT)) {
		return;
	}

	encrypt.in_buf = plaintext;
	encrypt.in_len = sizeof(plaintext);
	encrypt.out_buf_max = sizeof(encrypted);
	encrypt.out_buf = encrypted;

	if (cipher_cbc_op(&ini, &encrypt, iv)) {
		SYS_LOG_ERR("CBC mode ENCRYPT - Failed");
		goto out;
	}

	if (memcmp(encrypt.out_buf, ciphertext, sizeof(ciphertext))) {
		SYS_LOG_ERR("CBC mode ENCRYPT - Mismatch between expected and "
			    "returned cipher text");
		print_buffer_comparison(ciphertext,
					encrypt.out_buf, sizeof(ciphertext));
		goto out;
	}

	SYS_LOG_INF("CBC mode ENCRYPT - Match");
	cipher_free_session(dev, &ini);

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CBC,
				 CRYPTO_CIPHER_OP_DECRYPT)) {
		return;
	}

	decrypt.in_buf = encrypt.out_buf;	/* encrypted */
	decrypt.in_len = sizeof(encrypted);
	decrypt.out_buf = decrypted;
	decrypt.out_buf_max = sizeof(decrypted);

	/* TinyCrypt keeps IV at the start of encrypted buffer */
	if (cipher_cbc_op(&ini, &decrypt, encrypted)) {
		SYS_LOG_ERR("CBC mode DECRYPT - Failed");
		goto out;
	}

	if (memcmp(decrypt.out_buf, plaintext, sizeof(plaintext))) {
		SYS_LOG_ERR("CBC mode DECRYPT - Mismatch between plaintext and "
			    "decrypted cipher text");
		print_buffer_comparison(plaintext,
					decrypt.out_buf, sizeof(plaintext));
		goto out;
	}

	SYS_LOG_INF("CBC mode DECRYPT - Match");
out:
	cipher_free_session(dev, &ini);
}

u8_t ctr_ciphertext[64] = {
	0x22, 0xe5, 0x2f, 0xb1, 0x77, 0xd8, 0x65, 0xb2,
	0xf7, 0xc6, 0xb5, 0x12, 0x69, 0x2d, 0x11, 0x4d,
	0xed, 0x6c, 0x1c, 0x72, 0x25, 0xda, 0xf6, 0xa2,
	0xaa, 0xd9, 0xd3, 0xda, 0x2d, 0xba, 0x21, 0x68,
	0x35, 0xc0, 0xaf, 0x6b, 0x6f, 0x40, 0xc3, 0xc6,
	0xef, 0xc5, 0x85, 0xd0, 0x90, 0x2c, 0xc2, 0x63,
	0x12, 0x2b, 0xc5, 0x8e, 0x72, 0xde, 0x5c, 0xa2,
	0xa3, 0x5c, 0x85, 0x3a, 0xb9, 0x2c, 0x6, 0xbb
};

void ctr_mode(void)
{
	struct device *dev;
	struct cipher_ctx ini;
	struct cipher_pkt  encrypt;
	struct cipher_pkt decrypt;
	u8_t encrypted[64] = {0};
	u8_t decrypted[64] = {0};
	u8_t iv[12] = {
		0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
		0xf8, 0xf9, 0xfa, 0xfb
	};

	SYS_LOG_INF("CTR Mode");

	dev = device_get_binding(CRYPTO_DRV_NAME);
	if (!dev) {
		SYS_LOG_ERR("%s crypto device not found", CRYPTO_DRV_NAME);
		return;
	}

	if (validate_hw_compatibility(dev)) {
		SYS_LOG_ERR("Incompatible h/w");
		return;
	}

	ini.keylen = 16;
	ini.key.bit_stream = key;
	ini.flags = cap_flags;
	/*  ivlen + ctrlen = keylen , so ctrlen is 128 - 96 = 32 bits */
	ini.mode_params.ctr_info.ctr_len =  32;

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CTR,
				 CRYPTO_CIPHER_OP_ENCRYPT)) {
		return;
	}

	encrypt.in_buf = plaintext;

	encrypt.in_len = sizeof(plaintext);
	encrypt.out_buf_max = sizeof(encrypted);
	encrypt.out_buf = encrypted;

	if (cipher_ctr_op(&ini, &encrypt, iv)) {
		SYS_LOG_ERR("CTR mode ENCRYPT - Failed");
		goto out;
	}

	if (memcmp(encrypt.out_buf, ctr_ciphertext, sizeof(ctr_ciphertext))) {
		SYS_LOG_ERR("CTR mode ENCRYPT - Mismatch between expected "
			    "and returned cipher text");
		print_buffer_comparison(ctr_ciphertext, encrypt.out_buf,
					sizeof(ctr_ciphertext));
		goto out;
	}

	SYS_LOG_INF("CTR mode ENCRYPT - Match");
	cipher_free_session(dev, &ini);

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CTR,
				 CRYPTO_CIPHER_OP_DECRYPT)) {
		return;
	}

	decrypt.in_buf = encrypted;
	decrypt.in_len = sizeof(encrypted);
	decrypt.out_buf = decrypted;
	decrypt.out_buf_max = sizeof(decrypted);

	if (cipher_ctr_op(&ini, &decrypt, iv)) {
		SYS_LOG_ERR("CTR mode DECRYPT - Failed");
		goto out;
	}

	if (memcmp(decrypt.out_buf, plaintext, sizeof(plaintext))) {
		SYS_LOG_ERR("CTR mode DECRYPT - Mismatch between plaintext "
			    "and decypted cipher text");
		print_buffer_comparison(plaintext,
					encrypt.out_buf, sizeof(plaintext));
		goto out;
	}

	SYS_LOG_INF("CTR mode DECRYPT - Match");
out:
	cipher_free_session(dev, &ini);
}

/* RFC 3610 test vector #1 */
u8_t ccm_key[16] = {
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb,
	0xcc, 0xcd, 0xce, 0xcf
};
u8_t ccm_nonce[13] = {
	0x00, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
	0xa5
};
u8_t ccm_hdr[8] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07
};
u8_t ccm_data[23] = {
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13,
	0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e
};
u8_t ccm_expected[31] = {
	0x58, 0x8c, 0x97, 0x9a, 0x61, 0xc6, 0x63, 0xd2, 0xf0, 0x66, 0xd0, 0xc2,
	0xc0, 0xf9, 0x89, 0x80, 0x6d, 0x5f, 0x6b, 0x61, 0xda, 0xc3, 0x84, 0x17,
	0xe8, 0xd1, 0x2c, 0xfd, 0xf9, 0x26, 0xe0
};

void ccm_mode(void)
{
	struct device *dev;
	struct cipher_ctx ini;
	struct cipher_pkt encrypt;
	struct cipher_aead_pkt ccm_op;
	struct cipher_pkt decrypt;
	u8_t encrypted[50];
	u8_t decrypted[25];

	SYS_LOG_INF("CCM Mode");

	dev = device_get_binding(CRYPTO_DRV_NAME);
	if (!dev) {
		SYS_LOG_ERR("%s crypto device not found", CRYPTO_DRV_NAME);
		return;
	}

	if (validate_hw_compatibility(dev)) {
		SYS_LOG_ERR("Incompatible h/w");
		return;
	}

	ini.keylen = sizeof(ccm_key);
	ini.key.bit_stream = ccm_key;
	ini.mode_params.ccm_info.nonce_len = sizeof(ccm_nonce);
	ini.mode_params.ccm_info.tag_len = 8;
	ini.flags = cap_flags;

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CCM,
				 CRYPTO_CIPHER_OP_ENCRYPT)) {
		return;
	}

	encrypt.in_buf = ccm_data;
	encrypt.in_len = sizeof(ccm_data);
	encrypt.out_buf_max = sizeof(encrypted);
	encrypt.out_buf = encrypted;

	ccm_op.ad = ccm_hdr;
	ccm_op.ad_len = sizeof(ccm_hdr);
	ccm_op.pkt = &encrypt;

	/* TinyCrypt always puts the tag at the end of the ciphered text,
	 * but other library such as mbedtls might be more flexible and can
	 * take a different buffer for it. So to make sure test passes on
	 * all backends: enforcing the tag buffer to be after the ciphered
	 * text. */
	ccm_op.tag = encrypted + sizeof(ccm_data);

	if (cipher_ccm_op(&ini, &ccm_op, ccm_nonce)) {
		SYS_LOG_ERR("CCM mode ENCRYPT - Failed");
		goto out;
	}

	if (memcmp(encrypt.out_buf, ccm_expected, sizeof(ccm_expected))) {
		SYS_LOG_ERR("CCM mode ENCRYPT - Mismatch between expected "
			    "and returned cipher text");
		print_buffer_comparison(ccm_expected,
					encrypt.out_buf, sizeof(ccm_expected));
		goto out;
	}

	SYS_LOG_INF("CCM mode ENCRYPT - Match");
	cipher_free_session(dev, &ini);

	if (cipher_begin_session(dev, &ini, CRYPTO_CIPHER_ALGO_AES,
				 CRYPTO_CIPHER_MODE_CCM,
				 CRYPTO_CIPHER_OP_DECRYPT)) {
		return;
	}

	decrypt.in_buf = encrypted;
	decrypt.in_len = sizeof(ccm_data);
	decrypt.out_buf = decrypted;
	decrypt.out_buf_max = sizeof(decrypted);

	ccm_op.pkt = &decrypt;

	if (cipher_ccm_op(&ini, &ccm_op, ccm_nonce)) {
		SYS_LOG_ERR("CCM mode DECRYPT - Failed");
		goto out;
	}

	if (memcmp(decrypt.out_buf, ccm_data, sizeof(ccm_data))) {
		SYS_LOG_ERR("CCM mode DECRYPT - Mismatch between plaintext "
			"and decrypted cipher text");
		print_buffer_comparison(ccm_data,
					decrypt.out_buf, sizeof(ccm_data));
		goto out;
	}

	SYS_LOG_INF("CCM mode DECRYPT - Match");
out:
	cipher_free_session(dev, &ini);
}

void main(void)
{
	SYS_LOG_INF("Cipher Sample");
	cbc_mode();
	ctr_mode();
	ccm_mode();
}