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62867571 | 1 | /* |
f5afac4b | 2 | * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. |
bd989745 | 3 | * |
4a8b0c55 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
62867571 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
bd989745 AP |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
11 | #include "internal/cryptlib.h" | |
e23d850f | 12 | #include "internal/endian.h" |
bd989745 AP |
13 | |
14 | #ifndef OPENSSL_NO_CHACHA | |
15 | ||
16 | # include <openssl/evp.h> | |
17 | # include <openssl/objects.h> | |
25f2138b | 18 | # include "crypto/evp.h" |
706457b7 | 19 | # include "evp_local.h" |
25f2138b | 20 | # include "crypto/chacha.h" |
bd989745 AP |
21 | |
22 | typedef struct { | |
23 | union { | |
39147079 | 24 | OSSL_UNION_ALIGN; /* this ensures even sizeof(EVP_CHACHA_KEY)%8==0 */ |
bd989745 AP |
25 | unsigned int d[CHACHA_KEY_SIZE / 4]; |
26 | } key; | |
27 | unsigned int counter[CHACHA_CTR_SIZE / 4]; | |
28 | unsigned char buf[CHACHA_BLK_SIZE]; | |
29 | unsigned int partial_len; | |
30 | } EVP_CHACHA_KEY; | |
31 | ||
32 | #define data(ctx) ((EVP_CHACHA_KEY *)(ctx)->cipher_data) | |
33 | ||
2a3d0ee9 MC |
34 | #define CHACHA20_POLY1305_MAX_IVLEN 12 |
35 | ||
bd989745 AP |
36 | static int chacha_init_key(EVP_CIPHER_CTX *ctx, |
37 | const unsigned char user_key[CHACHA_KEY_SIZE], | |
38 | const unsigned char iv[CHACHA_CTR_SIZE], int enc) | |
39 | { | |
40 | EVP_CHACHA_KEY *key = data(ctx); | |
41 | unsigned int i; | |
42 | ||
43 | if (user_key) | |
44 | for (i = 0; i < CHACHA_KEY_SIZE; i+=4) { | |
45 | key->key.d[i/4] = CHACHA_U8TOU32(user_key+i); | |
46 | } | |
47 | ||
48 | if (iv) | |
49 | for (i = 0; i < CHACHA_CTR_SIZE; i+=4) { | |
50 | key->counter[i/4] = CHACHA_U8TOU32(iv+i); | |
51 | } | |
52 | ||
53 | key->partial_len = 0; | |
54 | ||
55 | return 1; | |
56 | } | |
57 | ||
bbaeadb0 | 58 | static int chacha_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
bd989745 AP |
59 | const unsigned char *inp, size_t len) |
60 | { | |
61 | EVP_CHACHA_KEY *key = data(ctx); | |
62 | unsigned int n, rem, ctr32; | |
63 | ||
64 | if ((n = key->partial_len)) { | |
65 | while (len && n < CHACHA_BLK_SIZE) { | |
66 | *out++ = *inp++ ^ key->buf[n++]; | |
67 | len--; | |
68 | } | |
69 | key->partial_len = n; | |
70 | ||
71 | if (len == 0) | |
72 | return 1; | |
73 | ||
74 | if (n == CHACHA_BLK_SIZE) { | |
75 | key->partial_len = 0; | |
76 | key->counter[0]++; | |
77 | if (key->counter[0] == 0) | |
78 | key->counter[1]++; | |
79 | } | |
80 | } | |
81 | ||
82 | rem = (unsigned int)(len % CHACHA_BLK_SIZE); | |
83 | len -= rem; | |
84 | ctr32 = key->counter[0]; | |
85 | while (len >= CHACHA_BLK_SIZE) { | |
86 | size_t blocks = len / CHACHA_BLK_SIZE; | |
87 | /* | |
88 | * 1<<28 is just a not-so-small yet not-so-large number... | |
89 | * Below condition is practically never met, but it has to | |
90 | * be checked for code correctness. | |
91 | */ | |
92 | if (sizeof(size_t)>sizeof(unsigned int) && blocks>(1U<<28)) | |
93 | blocks = (1U<<28); | |
94 | ||
95 | /* | |
96 | * As ChaCha20_ctr32 operates on 32-bit counter, caller | |
97 | * has to handle overflow. 'if' below detects the | |
98 | * overflow, which is then handled by limiting the | |
99 | * amount of blocks to the exact overflow point... | |
100 | */ | |
101 | ctr32 += (unsigned int)blocks; | |
102 | if (ctr32 < blocks) { | |
103 | blocks -= ctr32; | |
104 | ctr32 = 0; | |
105 | } | |
106 | blocks *= CHACHA_BLK_SIZE; | |
107 | ChaCha20_ctr32(out, inp, blocks, key->key.d, key->counter); | |
108 | len -= blocks; | |
109 | inp += blocks; | |
110 | out += blocks; | |
111 | ||
112 | key->counter[0] = ctr32; | |
113 | if (ctr32 == 0) key->counter[1]++; | |
114 | } | |
115 | ||
116 | if (rem) { | |
117 | memset(key->buf, 0, sizeof(key->buf)); | |
118 | ChaCha20_ctr32(key->buf, key->buf, CHACHA_BLK_SIZE, | |
119 | key->key.d, key->counter); | |
120 | for (n = 0; n < rem; n++) | |
121 | out[n] = inp[n] ^ key->buf[n]; | |
122 | key->partial_len = rem; | |
123 | } | |
124 | ||
125 | return 1; | |
126 | } | |
127 | ||
128 | static const EVP_CIPHER chacha20 = { | |
129 | NID_chacha20, | |
130 | 1, /* block_size */ | |
131 | CHACHA_KEY_SIZE, /* key_len */ | |
132 | CHACHA_CTR_SIZE, /* iv_len, 128-bit counter in the context */ | |
c83680a0 | 133 | EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT, |
f6c95e46 | 134 | EVP_ORIG_GLOBAL, |
bd989745 AP |
135 | chacha_init_key, |
136 | chacha_cipher, | |
137 | NULL, | |
138 | sizeof(EVP_CHACHA_KEY), | |
139 | NULL, | |
140 | NULL, | |
141 | NULL, | |
142 | NULL | |
143 | }; | |
144 | ||
145 | const EVP_CIPHER *EVP_chacha20(void) | |
146 | { | |
26a7d938 | 147 | return &chacha20; |
bd989745 AP |
148 | } |
149 | ||
150 | # ifndef OPENSSL_NO_POLY1305 | |
25f2138b | 151 | # include "crypto/poly1305.h" |
bd989745 AP |
152 | |
153 | typedef struct { | |
154 | EVP_CHACHA_KEY key; | |
155 | unsigned int nonce[12/4]; | |
156 | unsigned char tag[POLY1305_BLOCK_SIZE]; | |
a091e212 | 157 | unsigned char tls_aad[POLY1305_BLOCK_SIZE]; |
bd989745 AP |
158 | struct { uint64_t aad, text; } len; |
159 | int aad, mac_inited, tag_len, nonce_len; | |
160 | size_t tls_payload_length; | |
161 | } EVP_CHACHA_AEAD_CTX; | |
162 | ||
163 | # define NO_TLS_PAYLOAD_LENGTH ((size_t)-1) | |
164 | # define aead_data(ctx) ((EVP_CHACHA_AEAD_CTX *)(ctx)->cipher_data) | |
165 | # define POLY1305_ctx(actx) ((POLY1305 *)(actx + 1)) | |
166 | ||
167 | static int chacha20_poly1305_init_key(EVP_CIPHER_CTX *ctx, | |
168 | const unsigned char *inkey, | |
169 | const unsigned char *iv, int enc) | |
170 | { | |
171 | EVP_CHACHA_AEAD_CTX *actx = aead_data(ctx); | |
bd989745 AP |
172 | |
173 | if (!inkey && !iv) | |
174 | return 1; | |
175 | ||
176 | actx->len.aad = 0; | |
177 | actx->len.text = 0; | |
178 | actx->aad = 0; | |
179 | actx->mac_inited = 0; | |
180 | actx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH; | |
181 | ||
d2dfd482 KY |
182 | if (iv != NULL) { |
183 | unsigned char temp[CHACHA_CTR_SIZE] = { 0 }; | |
bd989745 | 184 | |
d2dfd482 KY |
185 | /* pad on the left */ |
186 | if (actx->nonce_len <= CHACHA_CTR_SIZE) | |
a091e212 AP |
187 | memcpy(temp + CHACHA_CTR_SIZE - actx->nonce_len, iv, |
188 | actx->nonce_len); | |
bd989745 | 189 | |
d2dfd482 KY |
190 | chacha_init_key(ctx, inkey, temp, enc); |
191 | ||
192 | actx->nonce[0] = actx->key.counter[1]; | |
193 | actx->nonce[1] = actx->key.counter[2]; | |
194 | actx->nonce[2] = actx->key.counter[3]; | |
195 | } else { | |
196 | chacha_init_key(ctx, inkey, NULL, enc); | |
197 | } | |
bd989745 AP |
198 | |
199 | return 1; | |
200 | } | |
201 | ||
a091e212 | 202 | # if !defined(OPENSSL_SMALL_FOOTPRINT) |
0edb109f AP |
203 | |
204 | # if defined(POLY1305_ASM) && (defined(__x86_64) || defined(__x86_64__) || \ | |
205 | defined(_M_AMD64) || defined(_M_X64)) | |
206 | # define XOR128_HELPERS | |
207 | void *xor128_encrypt_n_pad(void *out, const void *inp, void *otp, size_t len); | |
208 | void *xor128_decrypt_n_pad(void *out, const void *inp, void *otp, size_t len); | |
209 | static const unsigned char zero[4 * CHACHA_BLK_SIZE] = { 0 }; | |
210 | # else | |
a091e212 | 211 | static const unsigned char zero[2 * CHACHA_BLK_SIZE] = { 0 }; |
0edb109f | 212 | # endif |
a091e212 AP |
213 | |
214 | static int chacha20_poly1305_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
215 | const unsigned char *in, size_t len) | |
216 | { | |
217 | EVP_CHACHA_AEAD_CTX *actx = aead_data(ctx); | |
0edb109f AP |
218 | size_t tail, tohash_len, buf_len, plen = actx->tls_payload_length; |
219 | unsigned char *buf, *tohash, *ctr, storage[sizeof(zero) + 32]; | |
a091e212 AP |
220 | |
221 | if (len != plen + POLY1305_BLOCK_SIZE) | |
222 | return -1; | |
223 | ||
224 | buf = storage + ((0 - (size_t)storage) & 15); /* align */ | |
225 | ctr = buf + CHACHA_BLK_SIZE; | |
226 | tohash = buf + CHACHA_BLK_SIZE - POLY1305_BLOCK_SIZE; | |
227 | ||
0edb109f AP |
228 | # ifdef XOR128_HELPERS |
229 | if (plen <= 3 * CHACHA_BLK_SIZE) { | |
a091e212 | 230 | actx->key.counter[0] = 0; |
0edb109f AP |
231 | buf_len = (plen + 2 * CHACHA_BLK_SIZE - 1) & (0 - CHACHA_BLK_SIZE); |
232 | ChaCha20_ctr32(buf, zero, buf_len, actx->key.key.d, | |
a091e212 AP |
233 | actx->key.counter); |
234 | Poly1305_Init(POLY1305_ctx(actx), buf); | |
235 | actx->key.partial_len = 0; | |
236 | memcpy(tohash, actx->tls_aad, POLY1305_BLOCK_SIZE); | |
237 | tohash_len = POLY1305_BLOCK_SIZE; | |
238 | actx->len.aad = EVP_AEAD_TLS1_AAD_LEN; | |
239 | actx->len.text = plen; | |
240 | ||
0edb109f | 241 | if (plen) { |
b134300a | 242 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) |
0edb109f AP |
243 | ctr = xor128_encrypt_n_pad(out, in, ctr, plen); |
244 | else | |
245 | ctr = xor128_decrypt_n_pad(out, in, ctr, plen); | |
246 | ||
247 | in += plen; | |
248 | out += plen; | |
249 | tohash_len = (size_t)(ctr - tohash); | |
250 | } | |
251 | } | |
252 | # else | |
253 | if (plen <= CHACHA_BLK_SIZE) { | |
254 | size_t i; | |
255 | ||
256 | actx->key.counter[0] = 0; | |
257 | ChaCha20_ctr32(buf, zero, (buf_len = 2 * CHACHA_BLK_SIZE), | |
258 | actx->key.key.d, actx->key.counter); | |
259 | Poly1305_Init(POLY1305_ctx(actx), buf); | |
260 | actx->key.partial_len = 0; | |
261 | memcpy(tohash, actx->tls_aad, POLY1305_BLOCK_SIZE); | |
262 | tohash_len = POLY1305_BLOCK_SIZE; | |
263 | actx->len.aad = EVP_AEAD_TLS1_AAD_LEN; | |
264 | actx->len.text = plen; | |
265 | ||
b134300a | 266 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) { |
a091e212 AP |
267 | for (i = 0; i < plen; i++) { |
268 | out[i] = ctr[i] ^= in[i]; | |
269 | } | |
270 | } else { | |
271 | for (i = 0; i < plen; i++) { | |
272 | unsigned char c = in[i]; | |
273 | out[i] = ctr[i] ^ c; | |
274 | ctr[i] = c; | |
275 | } | |
276 | } | |
277 | ||
278 | in += i; | |
279 | out += i; | |
280 | ||
281 | tail = (0 - i) & (POLY1305_BLOCK_SIZE - 1); | |
282 | memset(ctr + i, 0, tail); | |
283 | ctr += i + tail; | |
284 | tohash_len += i + tail; | |
0edb109f AP |
285 | } |
286 | # endif | |
287 | else { | |
a091e212 | 288 | actx->key.counter[0] = 0; |
0edb109f AP |
289 | ChaCha20_ctr32(buf, zero, (buf_len = CHACHA_BLK_SIZE), |
290 | actx->key.key.d, actx->key.counter); | |
a091e212 AP |
291 | Poly1305_Init(POLY1305_ctx(actx), buf); |
292 | actx->key.counter[0] = 1; | |
293 | actx->key.partial_len = 0; | |
294 | Poly1305_Update(POLY1305_ctx(actx), actx->tls_aad, POLY1305_BLOCK_SIZE); | |
295 | tohash = ctr; | |
296 | tohash_len = 0; | |
297 | actx->len.aad = EVP_AEAD_TLS1_AAD_LEN; | |
298 | actx->len.text = plen; | |
299 | ||
b134300a | 300 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) { |
a091e212 AP |
301 | ChaCha20_ctr32(out, in, plen, actx->key.key.d, actx->key.counter); |
302 | Poly1305_Update(POLY1305_ctx(actx), out, plen); | |
303 | } else { | |
304 | Poly1305_Update(POLY1305_ctx(actx), in, plen); | |
305 | ChaCha20_ctr32(out, in, plen, actx->key.key.d, actx->key.counter); | |
306 | } | |
307 | ||
308 | in += plen; | |
309 | out += plen; | |
310 | tail = (0 - plen) & (POLY1305_BLOCK_SIZE - 1); | |
311 | Poly1305_Update(POLY1305_ctx(actx), zero, tail); | |
312 | } | |
313 | ||
314 | { | |
e23d850f | 315 | DECLARE_IS_ENDIAN; |
a091e212 | 316 | |
e23d850f | 317 | if (IS_LITTLE_ENDIAN) { |
a091e212 AP |
318 | memcpy(ctr, (unsigned char *)&actx->len, POLY1305_BLOCK_SIZE); |
319 | } else { | |
320 | ctr[0] = (unsigned char)(actx->len.aad); | |
321 | ctr[1] = (unsigned char)(actx->len.aad>>8); | |
322 | ctr[2] = (unsigned char)(actx->len.aad>>16); | |
323 | ctr[3] = (unsigned char)(actx->len.aad>>24); | |
324 | ctr[4] = (unsigned char)(actx->len.aad>>32); | |
325 | ctr[5] = (unsigned char)(actx->len.aad>>40); | |
326 | ctr[6] = (unsigned char)(actx->len.aad>>48); | |
327 | ctr[7] = (unsigned char)(actx->len.aad>>56); | |
328 | ||
329 | ctr[8] = (unsigned char)(actx->len.text); | |
330 | ctr[9] = (unsigned char)(actx->len.text>>8); | |
331 | ctr[10] = (unsigned char)(actx->len.text>>16); | |
332 | ctr[11] = (unsigned char)(actx->len.text>>24); | |
333 | ctr[12] = (unsigned char)(actx->len.text>>32); | |
334 | ctr[13] = (unsigned char)(actx->len.text>>40); | |
335 | ctr[14] = (unsigned char)(actx->len.text>>48); | |
336 | ctr[15] = (unsigned char)(actx->len.text>>56); | |
337 | } | |
338 | tohash_len += POLY1305_BLOCK_SIZE; | |
339 | } | |
340 | ||
341 | Poly1305_Update(POLY1305_ctx(actx), tohash, tohash_len); | |
0edb109f | 342 | OPENSSL_cleanse(buf, buf_len); |
b134300a TZ |
343 | Poly1305_Final(POLY1305_ctx(actx), |
344 | EVP_CIPHER_CTX_is_encrypting(ctx) ? actx->tag : tohash); | |
a091e212 AP |
345 | |
346 | actx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH; | |
347 | ||
b134300a | 348 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) { |
a091e212 AP |
349 | memcpy(out, actx->tag, POLY1305_BLOCK_SIZE); |
350 | } else { | |
351 | if (CRYPTO_memcmp(tohash, in, POLY1305_BLOCK_SIZE)) { | |
352 | memset(out - (len - POLY1305_BLOCK_SIZE), 0, | |
353 | len - POLY1305_BLOCK_SIZE); | |
354 | return -1; | |
355 | } | |
356 | } | |
357 | ||
358 | return len; | |
359 | } | |
360 | # else | |
361 | static const unsigned char zero[CHACHA_BLK_SIZE] = { 0 }; | |
362 | # endif | |
363 | ||
bd989745 AP |
364 | static int chacha20_poly1305_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
365 | const unsigned char *in, size_t len) | |
366 | { | |
367 | EVP_CHACHA_AEAD_CTX *actx = aead_data(ctx); | |
368 | size_t rem, plen = actx->tls_payload_length; | |
bd989745 AP |
369 | |
370 | if (!actx->mac_inited) { | |
a091e212 AP |
371 | # if !defined(OPENSSL_SMALL_FOOTPRINT) |
372 | if (plen != NO_TLS_PAYLOAD_LENGTH && out != NULL) | |
373 | return chacha20_poly1305_tls_cipher(ctx, out, in, len); | |
374 | # endif | |
bd989745 | 375 | actx->key.counter[0] = 0; |
a091e212 | 376 | ChaCha20_ctr32(actx->key.buf, zero, CHACHA_BLK_SIZE, |
bd989745 AP |
377 | actx->key.key.d, actx->key.counter); |
378 | Poly1305_Init(POLY1305_ctx(actx), actx->key.buf); | |
379 | actx->key.counter[0] = 1; | |
30a5f322 AP |
380 | actx->key.partial_len = 0; |
381 | actx->len.aad = actx->len.text = 0; | |
bd989745 | 382 | actx->mac_inited = 1; |
a091e212 AP |
383 | if (plen != NO_TLS_PAYLOAD_LENGTH) { |
384 | Poly1305_Update(POLY1305_ctx(actx), actx->tls_aad, | |
385 | EVP_AEAD_TLS1_AAD_LEN); | |
386 | actx->len.aad = EVP_AEAD_TLS1_AAD_LEN; | |
387 | actx->aad = 1; | |
388 | } | |
bd989745 AP |
389 | } |
390 | ||
391 | if (in) { /* aad or text */ | |
392 | if (out == NULL) { /* aad */ | |
393 | Poly1305_Update(POLY1305_ctx(actx), in, len); | |
394 | actx->len.aad += len; | |
395 | actx->aad = 1; | |
396 | return len; | |
397 | } else { /* plain- or ciphertext */ | |
398 | if (actx->aad) { /* wrap up aad */ | |
399 | if ((rem = (size_t)actx->len.aad % POLY1305_BLOCK_SIZE)) | |
400 | Poly1305_Update(POLY1305_ctx(actx), zero, | |
401 | POLY1305_BLOCK_SIZE - rem); | |
402 | actx->aad = 0; | |
403 | } | |
404 | ||
405 | actx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH; | |
406 | if (plen == NO_TLS_PAYLOAD_LENGTH) | |
407 | plen = len; | |
408 | else if (len != plen + POLY1305_BLOCK_SIZE) | |
409 | return -1; | |
410 | ||
b134300a | 411 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) { /* plaintext */ |
bd989745 AP |
412 | chacha_cipher(ctx, out, in, plen); |
413 | Poly1305_Update(POLY1305_ctx(actx), out, plen); | |
414 | in += plen; | |
415 | out += plen; | |
416 | actx->len.text += plen; | |
417 | } else { /* ciphertext */ | |
418 | Poly1305_Update(POLY1305_ctx(actx), in, plen); | |
419 | chacha_cipher(ctx, out, in, plen); | |
420 | in += plen; | |
421 | out += plen; | |
422 | actx->len.text += plen; | |
423 | } | |
424 | } | |
425 | } | |
426 | if (in == NULL /* explicit final */ | |
427 | || plen != len) { /* or tls mode */ | |
e23d850f | 428 | DECLARE_IS_ENDIAN; |
bd989745 AP |
429 | unsigned char temp[POLY1305_BLOCK_SIZE]; |
430 | ||
431 | if (actx->aad) { /* wrap up aad */ | |
432 | if ((rem = (size_t)actx->len.aad % POLY1305_BLOCK_SIZE)) | |
433 | Poly1305_Update(POLY1305_ctx(actx), zero, | |
434 | POLY1305_BLOCK_SIZE - rem); | |
435 | actx->aad = 0; | |
436 | } | |
437 | ||
438 | if ((rem = (size_t)actx->len.text % POLY1305_BLOCK_SIZE)) | |
439 | Poly1305_Update(POLY1305_ctx(actx), zero, | |
440 | POLY1305_BLOCK_SIZE - rem); | |
441 | ||
e23d850f | 442 | if (IS_LITTLE_ENDIAN) { |
bd989745 AP |
443 | Poly1305_Update(POLY1305_ctx(actx), |
444 | (unsigned char *)&actx->len, POLY1305_BLOCK_SIZE); | |
445 | } else { | |
446 | temp[0] = (unsigned char)(actx->len.aad); | |
447 | temp[1] = (unsigned char)(actx->len.aad>>8); | |
448 | temp[2] = (unsigned char)(actx->len.aad>>16); | |
449 | temp[3] = (unsigned char)(actx->len.aad>>24); | |
450 | temp[4] = (unsigned char)(actx->len.aad>>32); | |
451 | temp[5] = (unsigned char)(actx->len.aad>>40); | |
452 | temp[6] = (unsigned char)(actx->len.aad>>48); | |
453 | temp[7] = (unsigned char)(actx->len.aad>>56); | |
454 | ||
455 | temp[8] = (unsigned char)(actx->len.text); | |
456 | temp[9] = (unsigned char)(actx->len.text>>8); | |
457 | temp[10] = (unsigned char)(actx->len.text>>16); | |
458 | temp[11] = (unsigned char)(actx->len.text>>24); | |
459 | temp[12] = (unsigned char)(actx->len.text>>32); | |
460 | temp[13] = (unsigned char)(actx->len.text>>40); | |
461 | temp[14] = (unsigned char)(actx->len.text>>48); | |
462 | temp[15] = (unsigned char)(actx->len.text>>56); | |
463 | ||
464 | Poly1305_Update(POLY1305_ctx(actx), temp, POLY1305_BLOCK_SIZE); | |
465 | } | |
b134300a TZ |
466 | Poly1305_Final(POLY1305_ctx(actx), |
467 | EVP_CIPHER_CTX_is_encrypting(ctx) ? actx->tag : temp); | |
bd989745 AP |
468 | actx->mac_inited = 0; |
469 | ||
470 | if (in != NULL && len != plen) { /* tls mode */ | |
b134300a | 471 | if (EVP_CIPHER_CTX_is_encrypting(ctx)) { |
bd989745 AP |
472 | memcpy(out, actx->tag, POLY1305_BLOCK_SIZE); |
473 | } else { | |
474 | if (CRYPTO_memcmp(temp, in, POLY1305_BLOCK_SIZE)) { | |
bf52165b | 475 | memset(out - plen, 0, plen); |
bd989745 AP |
476 | return -1; |
477 | } | |
478 | } | |
479 | } | |
b134300a | 480 | else if (!EVP_CIPHER_CTX_is_encrypting(ctx)) { |
bd989745 AP |
481 | if (CRYPTO_memcmp(temp, actx->tag, actx->tag_len)) |
482 | return -1; | |
483 | } | |
484 | } | |
485 | return len; | |
486 | } | |
487 | ||
488 | static int chacha20_poly1305_cleanup(EVP_CIPHER_CTX *ctx) | |
489 | { | |
490 | EVP_CHACHA_AEAD_CTX *actx = aead_data(ctx); | |
491 | if (actx) | |
a8f95768 | 492 | OPENSSL_cleanse(ctx->cipher_data, sizeof(*actx) + Poly1305_ctx_size()); |
bd989745 AP |
493 | return 1; |
494 | } | |
495 | ||
496 | static int chacha20_poly1305_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, | |
497 | void *ptr) | |
498 | { | |
499 | EVP_CHACHA_AEAD_CTX *actx = aead_data(ctx); | |
500 | ||
1287dabd | 501 | switch (type) { |
bd989745 AP |
502 | case EVP_CTRL_INIT: |
503 | if (actx == NULL) | |
504 | actx = ctx->cipher_data | |
505 | = OPENSSL_zalloc(sizeof(*actx) + Poly1305_ctx_size()); | |
506 | if (actx == NULL) { | |
9311d0c4 | 507 | ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
bd989745 AP |
508 | return 0; |
509 | } | |
510 | actx->len.aad = 0; | |
511 | actx->len.text = 0; | |
512 | actx->aad = 0; | |
513 | actx->mac_inited = 0; | |
514 | actx->tag_len = 0; | |
515 | actx->nonce_len = 12; | |
516 | actx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH; | |
a091e212 | 517 | memset(actx->tls_aad, 0, POLY1305_BLOCK_SIZE); |
bd989745 AP |
518 | return 1; |
519 | ||
520 | case EVP_CTRL_COPY: | |
521 | if (actx) { | |
700b8145 F |
522 | EVP_CIPHER_CTX *dst = (EVP_CIPHER_CTX *)ptr; |
523 | ||
524 | dst->cipher_data = | |
525 | OPENSSL_memdup(actx, sizeof(*actx) + Poly1305_ctx_size()); | |
526 | if (dst->cipher_data == NULL) { | |
9311d0c4 | 527 | ERR_raise(ERR_LIB_EVP, EVP_R_COPY_ERROR); |
bd989745 AP |
528 | return 0; |
529 | } | |
530 | } | |
531 | return 1; | |
532 | ||
7dddf2fc SL |
533 | case EVP_CTRL_GET_IVLEN: |
534 | *(int *)ptr = actx->nonce_len; | |
535 | return 1; | |
536 | ||
bd989745 | 537 | case EVP_CTRL_AEAD_SET_IVLEN: |
2a3d0ee9 | 538 | if (arg <= 0 || arg > CHACHA20_POLY1305_MAX_IVLEN) |
bd989745 AP |
539 | return 0; |
540 | actx->nonce_len = arg; | |
541 | return 1; | |
542 | ||
543 | case EVP_CTRL_AEAD_SET_IV_FIXED: | |
544 | if (arg != 12) | |
545 | return 0; | |
546 | actx->nonce[0] = actx->key.counter[1] | |
547 | = CHACHA_U8TOU32((unsigned char *)ptr); | |
548 | actx->nonce[1] = actx->key.counter[2] | |
549 | = CHACHA_U8TOU32((unsigned char *)ptr+4); | |
550 | actx->nonce[2] = actx->key.counter[3] | |
551 | = CHACHA_U8TOU32((unsigned char *)ptr+8); | |
552 | return 1; | |
553 | ||
554 | case EVP_CTRL_AEAD_SET_TAG: | |
555 | if (arg <= 0 || arg > POLY1305_BLOCK_SIZE) | |
556 | return 0; | |
557 | if (ptr != NULL) { | |
558 | memcpy(actx->tag, ptr, arg); | |
559 | actx->tag_len = arg; | |
560 | } | |
561 | return 1; | |
562 | ||
563 | case EVP_CTRL_AEAD_GET_TAG: | |
b134300a TZ |
564 | if (arg <= 0 || arg > POLY1305_BLOCK_SIZE || |
565 | !EVP_CIPHER_CTX_is_encrypting(ctx)) | |
bd989745 AP |
566 | return 0; |
567 | memcpy(ptr, actx->tag, arg); | |
568 | return 1; | |
569 | ||
570 | case EVP_CTRL_AEAD_TLS1_AAD: | |
571 | if (arg != EVP_AEAD_TLS1_AAD_LEN) | |
572 | return 0; | |
573 | { | |
574 | unsigned int len; | |
a091e212 | 575 | unsigned char *aad = ptr; |
bd989745 | 576 | |
a091e212 | 577 | memcpy(actx->tls_aad, ptr, EVP_AEAD_TLS1_AAD_LEN); |
30a5f322 AP |
578 | len = aad[EVP_AEAD_TLS1_AAD_LEN - 2] << 8 | |
579 | aad[EVP_AEAD_TLS1_AAD_LEN - 1]; | |
a091e212 | 580 | aad = actx->tls_aad; |
b134300a | 581 | if (!EVP_CIPHER_CTX_is_encrypting(ctx)) { |
2198b3a5 AP |
582 | if (len < POLY1305_BLOCK_SIZE) |
583 | return 0; | |
bd989745 | 584 | len -= POLY1305_BLOCK_SIZE; /* discount attached tag */ |
a091e212 AP |
585 | aad[EVP_AEAD_TLS1_AAD_LEN - 2] = (unsigned char)(len >> 8); |
586 | aad[EVP_AEAD_TLS1_AAD_LEN - 1] = (unsigned char)len; | |
bd989745 AP |
587 | } |
588 | actx->tls_payload_length = len; | |
589 | ||
590 | /* | |
2198b3a5 | 591 | * merge record sequence number as per RFC7905 |
bd989745 AP |
592 | */ |
593 | actx->key.counter[1] = actx->nonce[0]; | |
30a5f322 AP |
594 | actx->key.counter[2] = actx->nonce[1] ^ CHACHA_U8TOU32(aad); |
595 | actx->key.counter[3] = actx->nonce[2] ^ CHACHA_U8TOU32(aad+4); | |
bd989745 | 596 | actx->mac_inited = 0; |
a091e212 | 597 | |
bd989745 AP |
598 | return POLY1305_BLOCK_SIZE; /* tag length */ |
599 | } | |
600 | ||
601 | case EVP_CTRL_AEAD_SET_MAC_KEY: | |
602 | /* no-op */ | |
603 | return 1; | |
604 | ||
605 | default: | |
606 | return -1; | |
607 | } | |
608 | } | |
609 | ||
610 | static EVP_CIPHER chacha20_poly1305 = { | |
611 | NID_chacha20_poly1305, | |
612 | 1, /* block_size */ | |
613 | CHACHA_KEY_SIZE, /* key_len */ | |
614 | 12, /* iv_len, 96-bit nonce in the context */ | |
615 | EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_CUSTOM_IV | | |
616 | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | | |
7dddf2fc SL |
617 | EVP_CIPH_CUSTOM_COPY | EVP_CIPH_FLAG_CUSTOM_CIPHER | |
618 | EVP_CIPH_CUSTOM_IV_LENGTH, | |
f6c95e46 | 619 | EVP_ORIG_GLOBAL, |
bd989745 AP |
620 | chacha20_poly1305_init_key, |
621 | chacha20_poly1305_cipher, | |
622 | chacha20_poly1305_cleanup, | |
623 | 0, /* 0 moves context-specific structure allocation to ctrl */ | |
624 | NULL, /* set_asn1_parameters */ | |
625 | NULL, /* get_asn1_parameters */ | |
626 | chacha20_poly1305_ctrl, | |
627 | NULL /* app_data */ | |
628 | }; | |
629 | ||
630 | const EVP_CIPHER *EVP_chacha20_poly1305(void) | |
631 | { | |
632 | return(&chacha20_poly1305); | |
633 | } | |
634 | # endif | |
635 | #endif |