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a672a02a SL |
1 | /* |
2 | * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
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 | |
8 | */ | |
9 | ||
e1178600 SL |
10 | /* Dispatch functions for gcm mode */ |
11 | ||
12 | #include "cipher_locl.h" | |
4a42e264 SL |
13 | #include "internal/ciphers/cipher_gcm.h" |
14 | #include "internal/providercommonerr.h" | |
a672a02a | 15 | #include "internal/rand_int.h" |
a672a02a | 16 | #include "internal/provider_ctx.h" |
a672a02a SL |
17 | |
18 | static int gcm_tls_init(PROV_GCM_CTX *dat, unsigned char *aad, size_t aad_len); | |
19 | static int gcm_tls_iv_set_fixed(PROV_GCM_CTX *ctx, unsigned char *iv, | |
20 | size_t len); | |
21 | static int gcm_tls_cipher(PROV_GCM_CTX *ctx, unsigned char *out, size_t *padlen, | |
22 | const unsigned char *in, size_t len); | |
23 | static int gcm_cipher_internal(PROV_GCM_CTX *ctx, unsigned char *out, | |
24 | size_t *padlen, const unsigned char *in, | |
25 | size_t len); | |
26 | ||
e1178600 SL |
27 | void gcm_initctx(void *provctx, PROV_GCM_CTX *ctx, size_t keybits, |
28 | const PROV_GCM_HW *hw, size_t ivlen_min) | |
a672a02a SL |
29 | { |
30 | ctx->pad = 1; | |
31 | ctx->mode = EVP_CIPH_GCM_MODE; | |
32 | ctx->taglen = -1; | |
33 | ctx->tls_aad_len = -1; | |
34 | ctx->ivlen_min = ivlen_min; | |
35 | ctx->ivlen = (EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN); | |
36 | ctx->keylen = keybits / 8; | |
37 | ctx->hw = hw; | |
38 | ctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx); | |
39 | } | |
40 | ||
e1178600 | 41 | void gcm_deinitctx(PROV_GCM_CTX *ctx) |
a672a02a SL |
42 | { |
43 | OPENSSL_cleanse(ctx->iv, sizeof(ctx->iv)); | |
44 | } | |
45 | ||
46 | static int gcm_init(void *vctx, const unsigned char *key, size_t keylen, | |
47 | const unsigned char *iv, size_t ivlen, int enc) | |
48 | { | |
49 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
50 | ||
51 | ctx->enc = enc; | |
52 | ||
53 | if (iv != NULL) { | |
54 | if (ivlen < ctx->ivlen_min || ivlen > sizeof(ctx->iv)) { | |
784883fc | 55 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH); |
a672a02a SL |
56 | return 0; |
57 | } | |
58 | ctx->ivlen = ivlen; | |
59 | memcpy(ctx->iv, iv, ctx->ivlen); | |
60 | ctx->iv_state = IV_STATE_BUFFERED; | |
61 | } | |
62 | ||
63 | if (key != NULL) { | |
64 | if (keylen != ctx->keylen) { | |
784883fc | 65 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH); |
a672a02a SL |
66 | return 0; |
67 | } | |
68 | return ctx->hw->setkey(ctx, key, ctx->keylen); | |
69 | } | |
70 | return 1; | |
71 | } | |
72 | ||
e1178600 SL |
73 | int gcm_einit(void *vctx, const unsigned char *key, size_t keylen, |
74 | const unsigned char *iv, size_t ivlen) | |
a672a02a SL |
75 | { |
76 | return gcm_init(vctx, key, keylen, iv, ivlen, 1); | |
77 | } | |
78 | ||
e1178600 SL |
79 | int gcm_dinit(void *vctx, const unsigned char *key, size_t keylen, |
80 | const unsigned char *iv, size_t ivlen) | |
a672a02a SL |
81 | { |
82 | return gcm_init(vctx, key, keylen, iv, ivlen, 0); | |
83 | } | |
84 | ||
e1178600 | 85 | int gcm_get_ctx_params(void *vctx, OSSL_PARAM params[]) |
a672a02a SL |
86 | { |
87 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
88 | OSSL_PARAM *p; | |
89 | size_t sz; | |
90 | ||
91 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN); | |
3bfe9005 SL |
92 | if (p != NULL && !OSSL_PARAM_set_int(p, ctx->ivlen)) { |
93 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); | |
94 | return 0; | |
a672a02a SL |
95 | } |
96 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN); | |
97 | if (p != NULL && !OSSL_PARAM_set_int(p, ctx->keylen)) { | |
784883fc | 98 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); |
a672a02a SL |
99 | return 0; |
100 | } | |
101 | ||
102 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV); | |
103 | if (p != NULL) { | |
104 | if (ctx->iv_gen != 1 && ctx->iv_gen_rand != 1) | |
105 | return 0; | |
106 | if (ctx->ivlen != (int)p->data_size) { | |
784883fc | 107 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH); |
a672a02a SL |
108 | return 0; |
109 | } | |
110 | if (!OSSL_PARAM_set_octet_string(p, ctx->iv, ctx->ivlen)) { | |
784883fc | 111 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); |
a672a02a SL |
112 | return 0; |
113 | } | |
114 | } | |
115 | ||
116 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD); | |
117 | if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) { | |
784883fc | 118 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); |
a672a02a SL |
119 | return 0; |
120 | } | |
121 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG); | |
122 | if (p != NULL) { | |
123 | sz = p->data_size; | |
124 | if (sz == 0 || sz > EVP_GCM_TLS_TAG_LEN || !ctx->enc || ctx->taglen < 0) { | |
784883fc | 125 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG); |
a672a02a SL |
126 | return 0; |
127 | } | |
128 | if (!OSSL_PARAM_set_octet_string(p, ctx->buf, sz)) { | |
784883fc | 129 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); |
a672a02a SL |
130 | return 0; |
131 | } | |
132 | } | |
133 | return 1; | |
134 | } | |
135 | ||
e1178600 | 136 | int gcm_set_ctx_params(void *vctx, const OSSL_PARAM params[]) |
a672a02a SL |
137 | { |
138 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
139 | const OSSL_PARAM *p; | |
140 | size_t sz; | |
141 | void *vp; | |
142 | ||
143 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG); | |
144 | if (p != NULL) { | |
145 | vp = ctx->buf; | |
146 | if (!OSSL_PARAM_get_octet_string(p, &vp, EVP_GCM_TLS_TAG_LEN, &sz)) { | |
784883fc | 147 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
a672a02a SL |
148 | return 0; |
149 | } | |
150 | if (sz == 0 || ctx->enc) { | |
784883fc | 151 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG); |
a672a02a SL |
152 | return 0; |
153 | } | |
154 | ctx->taglen = sz; | |
155 | } | |
156 | ||
157 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_IVLEN); | |
158 | if (p != NULL) { | |
159 | if (!OSSL_PARAM_get_size_t(p, &sz)) { | |
784883fc | 160 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
a672a02a SL |
161 | return 0; |
162 | } | |
163 | if (sz == 0 || sz > sizeof(ctx->iv)) { | |
784883fc | 164 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH); |
a672a02a SL |
165 | return 0; |
166 | } | |
167 | ctx->ivlen = sz; | |
168 | } | |
169 | ||
170 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD); | |
171 | if (p != NULL) { | |
172 | if (p->data_type != OSSL_PARAM_OCTET_STRING) { | |
784883fc | 173 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
a672a02a SL |
174 | return 0; |
175 | } | |
176 | sz = gcm_tls_init(ctx, p->data, p->data_size); | |
177 | if (sz == 0) { | |
784883fc | 178 | ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_AAD); |
a672a02a SL |
179 | return 0; |
180 | } | |
181 | ctx->tls_aad_pad_sz = sz; | |
182 | } | |
183 | ||
184 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED); | |
185 | if (p != NULL) { | |
186 | if (p->data_type != OSSL_PARAM_OCTET_STRING) { | |
784883fc | 187 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
a672a02a SL |
188 | return 0; |
189 | } | |
190 | if (gcm_tls_iv_set_fixed(ctx, p->data, p->data_size) == 0) { | |
784883fc | 191 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
a672a02a SL |
192 | return 0; |
193 | } | |
194 | } | |
195 | ||
e9c116eb SL |
196 | /* |
197 | * TODO(3.0) Temporary solution to address fuzz test crash, which will be | |
198 | * reworked once the discussion in PR #9510 is resolved. i.e- We need a | |
199 | * general solution for handling missing parameters inside set_params and | |
200 | * get_params methods. | |
201 | */ | |
202 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN); | |
203 | if (p != NULL) { | |
204 | int keylen; | |
205 | ||
206 | if (!OSSL_PARAM_get_int(p, &keylen)) { | |
784883fc | 207 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); |
e9c116eb SL |
208 | return 0; |
209 | } | |
210 | /* The key length can not be modified for gcm mode */ | |
211 | if (keylen != (int)ctx->keylen) | |
212 | return 0; | |
213 | } | |
214 | ||
a672a02a SL |
215 | return 1; |
216 | } | |
217 | ||
e1178600 SL |
218 | int gcm_stream_update(void *vctx, unsigned char *out, size_t *outl, |
219 | size_t outsize, const unsigned char *in, size_t inl) | |
a672a02a SL |
220 | { |
221 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
222 | ||
223 | if (outsize < inl) { | |
784883fc | 224 | ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL); |
a672a02a SL |
225 | return -1; |
226 | } | |
227 | ||
228 | if (gcm_cipher_internal(ctx, out, outl, in, inl) <= 0) { | |
784883fc | 229 | ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED); |
a672a02a SL |
230 | return -1; |
231 | } | |
232 | return 1; | |
233 | } | |
234 | ||
e1178600 SL |
235 | int gcm_stream_final(void *vctx, unsigned char *out, size_t *outl, |
236 | size_t outsize) | |
a672a02a SL |
237 | { |
238 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
239 | int i; | |
240 | ||
241 | i = gcm_cipher_internal(ctx, out, outl, NULL, 0); | |
242 | if (i <= 0) | |
243 | return 0; | |
244 | ||
245 | *outl = 0; | |
246 | return 1; | |
247 | } | |
248 | ||
e1178600 SL |
249 | int gcm_cipher(void *vctx, |
250 | unsigned char *out, size_t *outl, size_t outsize, | |
251 | const unsigned char *in, size_t inl) | |
a672a02a SL |
252 | { |
253 | PROV_GCM_CTX *ctx = (PROV_GCM_CTX *)vctx; | |
254 | ||
255 | if (outsize < inl) { | |
784883fc | 256 | ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL); |
a672a02a SL |
257 | return -1; |
258 | } | |
259 | ||
260 | if (gcm_cipher_internal(ctx, out, outl, in, inl) <= 0) | |
261 | return -1; | |
262 | ||
263 | *outl = inl; | |
264 | return 1; | |
265 | } | |
266 | ||
267 | /* | |
268 | * See SP800-38D (GCM) Section 8 "Uniqueness requirement on IVS and keys" | |
269 | * | |
270 | * See also 8.2.2 RBG-based construction. | |
271 | * Random construction consists of a free field (which can be NULL) and a | |
272 | * random field which will use a DRBG that can return at least 96 bits of | |
273 | * entropy strength. (The DRBG must be seeded by the FIPS module). | |
274 | */ | |
275 | static int gcm_iv_generate(PROV_GCM_CTX *ctx, int offset) | |
276 | { | |
277 | int sz = ctx->ivlen - offset; | |
278 | ||
279 | /* Must be at least 96 bits */ | |
280 | if (sz <= 0 || ctx->ivlen < GCM_IV_DEFAULT_SIZE) | |
281 | return 0; | |
282 | ||
283 | /* Use DRBG to generate random iv */ | |
284 | if (rand_bytes_ex(ctx->libctx, ctx->iv + offset, sz) <= 0) | |
285 | return 0; | |
286 | ctx->iv_state = IV_STATE_BUFFERED; | |
287 | ctx->iv_gen_rand = 1; | |
288 | return 1; | |
289 | } | |
290 | ||
291 | static int gcm_cipher_internal(PROV_GCM_CTX *ctx, unsigned char *out, | |
292 | size_t *padlen, const unsigned char *in, | |
293 | size_t len) | |
294 | { | |
295 | size_t olen = 0; | |
296 | int rv = 0; | |
297 | const PROV_GCM_HW *hw = ctx->hw; | |
298 | ||
299 | if (ctx->tls_aad_len >= 0) | |
300 | return gcm_tls_cipher(ctx, out, padlen, in, len); | |
301 | ||
302 | if (!ctx->key_set || ctx->iv_state == IV_STATE_FINISHED) | |
303 | goto err; | |
304 | ||
305 | /* | |
306 | * FIPS requires generation of AES-GCM IV's inside the FIPS module. | |
307 | * The IV can still be set externally (the security policy will state that | |
308 | * this is not FIPS compliant). There are some applications | |
309 | * where setting the IV externally is the only option available. | |
310 | */ | |
311 | if (ctx->iv_state == IV_STATE_UNINITIALISED) { | |
312 | if (!ctx->enc || !gcm_iv_generate(ctx, 0)) | |
313 | goto err; | |
314 | } | |
315 | ||
316 | if (ctx->iv_state == IV_STATE_BUFFERED) { | |
317 | if (!hw->setiv(ctx, ctx->iv, ctx->ivlen)) | |
318 | goto err; | |
319 | ctx->iv_state = IV_STATE_COPIED; | |
320 | } | |
321 | ||
322 | if (in != NULL) { | |
323 | /* The input is AAD if out is NULL */ | |
324 | if (out == NULL) { | |
325 | if (!hw->aadupdate(ctx, in, len)) | |
326 | goto err; | |
327 | } else { | |
328 | /* The input is ciphertext OR plaintext */ | |
329 | if (!hw->cipherupdate(ctx, in, len, out)) | |
330 | goto err; | |
331 | } | |
332 | } else { | |
333 | /* Finished when in == NULL */ | |
334 | if (!hw->cipherfinal(ctx, ctx->buf)) | |
335 | goto err; | |
336 | ctx->iv_state = IV_STATE_FINISHED; /* Don't reuse the IV */ | |
337 | goto finish; | |
338 | } | |
339 | olen = len; | |
340 | finish: | |
341 | rv = 1; | |
342 | err: | |
343 | *padlen = olen; | |
344 | return rv; | |
345 | } | |
346 | ||
347 | static int gcm_tls_init(PROV_GCM_CTX *dat, unsigned char *aad, size_t aad_len) | |
348 | { | |
349 | unsigned char *buf; | |
350 | size_t len; | |
351 | ||
352 | if (aad_len != EVP_AEAD_TLS1_AAD_LEN) | |
353 | return 0; | |
354 | ||
355 | /* Save the aad for later use. */ | |
356 | buf = dat->buf; | |
357 | memcpy(buf, aad, aad_len); | |
358 | dat->tls_aad_len = aad_len; | |
359 | dat->tls_enc_records = 0; | |
360 | ||
361 | len = buf[aad_len - 2] << 8 | buf[aad_len - 1]; | |
362 | /* Correct length for explicit iv. */ | |
363 | if (len < EVP_GCM_TLS_EXPLICIT_IV_LEN) | |
364 | return 0; | |
365 | len -= EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
366 | ||
367 | /* If decrypting correct for tag too. */ | |
368 | if (!dat->enc) { | |
369 | if (len < EVP_GCM_TLS_TAG_LEN) | |
370 | return 0; | |
371 | len -= EVP_GCM_TLS_TAG_LEN; | |
372 | } | |
373 | buf[aad_len - 2] = (unsigned char)(len >> 8); | |
374 | buf[aad_len - 1] = (unsigned char)(len & 0xff); | |
375 | /* Extra padding: tag appended to record. */ | |
376 | return EVP_GCM_TLS_TAG_LEN; | |
377 | } | |
378 | ||
379 | static int gcm_tls_iv_set_fixed(PROV_GCM_CTX *ctx, unsigned char *iv, | |
380 | size_t len) | |
381 | { | |
382 | /* Special case: -1 length restores whole IV */ | |
383 | if (len == (size_t)-1) { | |
384 | memcpy(ctx->iv, iv, ctx->ivlen); | |
385 | ctx->iv_gen = 1; | |
386 | ctx->iv_state = IV_STATE_BUFFERED; | |
387 | return 1; | |
388 | } | |
389 | /* Fixed field must be at least 4 bytes and invocation field at least 8 */ | |
390 | if ((len < EVP_GCM_TLS_FIXED_IV_LEN) | |
391 | || (ctx->ivlen - (int)len) < EVP_GCM_TLS_EXPLICIT_IV_LEN) | |
392 | return 0; | |
393 | if (len > 0) | |
394 | memcpy(ctx->iv, iv, len); | |
395 | if (ctx->enc | |
396 | && rand_bytes_ex(ctx->libctx, ctx->iv + len, ctx->ivlen - len) <= 0) | |
397 | return 0; | |
398 | ctx->iv_gen = 1; | |
399 | ctx->iv_state = IV_STATE_BUFFERED; | |
400 | return 1; | |
401 | } | |
402 | ||
403 | /* increment counter (64-bit int) by 1 */ | |
404 | static void ctr64_inc(unsigned char *counter) | |
405 | { | |
406 | int n = 8; | |
407 | unsigned char c; | |
408 | ||
409 | do { | |
410 | --n; | |
411 | c = counter[n]; | |
412 | ++c; | |
413 | counter[n] = c; | |
414 | if (c > 0) | |
415 | return; | |
416 | } while (n > 0); | |
417 | } | |
418 | ||
419 | /* | |
420 | * Handle TLS GCM packet format. This consists of the last portion of the IV | |
421 | * followed by the payload and finally the tag. On encrypt generate IV, | |
422 | * encrypt payload and write the tag. On verify retrieve IV, decrypt payload | |
423 | * and verify tag. | |
424 | */ | |
425 | static int gcm_tls_cipher(PROV_GCM_CTX *ctx, unsigned char *out, size_t *padlen, | |
426 | const unsigned char *in, size_t len) | |
427 | { | |
428 | int rv = 0, arg = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
429 | size_t plen = 0; | |
430 | unsigned char *tag = NULL; | |
431 | ||
432 | if (!ctx->key_set) | |
433 | goto err; | |
434 | ||
435 | /* Encrypt/decrypt must be performed in place */ | |
436 | if (out != in || len < (EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN)) | |
437 | goto err; | |
438 | ||
439 | /* | |
440 | * Check for too many keys as per FIPS 140-2 IG A.5 "Key/IV Pair Uniqueness | |
441 | * Requirements from SP 800-38D". The requirements is for one party to the | |
442 | * communication to fail after 2^64 - 1 keys. We do this on the encrypting | |
443 | * side only. | |
444 | */ | |
445 | if (ctx->enc && ++ctx->tls_enc_records == 0) { | |
784883fc | 446 | ERR_raise(ERR_LIB_PROV, EVP_R_TOO_MANY_RECORDS); |
a672a02a SL |
447 | goto err; |
448 | } | |
449 | ||
450 | if (ctx->iv_gen == 0) | |
451 | goto err; | |
452 | /* | |
453 | * Set IV from start of buffer or generate IV and write to start of | |
454 | * buffer. | |
455 | */ | |
456 | if (ctx->enc) { | |
457 | if (!ctx->hw->setiv(ctx, ctx->iv, ctx->ivlen)) | |
458 | goto err; | |
459 | if (arg > ctx->ivlen) | |
460 | arg = ctx->ivlen; | |
461 | memcpy(out, ctx->iv + ctx->ivlen - arg, arg); | |
462 | /* | |
463 | * Invocation field will be at least 8 bytes in size and so no need | |
464 | * to check wrap around or increment more than last 8 bytes. | |
465 | */ | |
466 | ctr64_inc(ctx->iv + ctx->ivlen - 8); | |
467 | } else { | |
468 | memcpy(ctx->iv + ctx->ivlen - arg, out, arg); | |
469 | if (!ctx->hw->setiv(ctx, ctx->iv, ctx->ivlen)) | |
470 | goto err; | |
471 | } | |
472 | ctx->iv_state = IV_STATE_COPIED; | |
473 | ||
474 | /* Fix buffer and length to point to payload */ | |
475 | in += EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
476 | out += EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
477 | len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN; | |
478 | ||
479 | tag = ctx->enc ? out + len : (unsigned char *)in + len; | |
480 | if (!ctx->hw->oneshot(ctx, ctx->buf, ctx->tls_aad_len, in, len, out, tag, | |
481 | EVP_GCM_TLS_TAG_LEN)) { | |
482 | if (!ctx->enc) | |
483 | OPENSSL_cleanse(out, len); | |
484 | goto err; | |
485 | } | |
486 | if (ctx->enc) | |
487 | plen = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN; | |
488 | else | |
489 | plen = len; | |
490 | ||
491 | rv = 1; | |
492 | err: | |
493 | ctx->iv_state = IV_STATE_FINISHED; | |
494 | ctx->tls_aad_len = -1; | |
495 | *padlen = plen; | |
496 | return rv; | |
497 | } |