]>
Commit | Line | Data |
---|---|---|
8bf36651 | 1 | /* |
a28d06f3 | 2 | * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved. |
8bf36651 | 3 | * |
0db63de9 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
8bf36651 SL |
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 | ||
10 | #include <assert.h> | |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
f000e828 | 13 | #include <openssl/sha.h> |
8bf36651 SL |
14 | #include <openssl/crypto.h> |
15 | #include <openssl/err.h> | |
16 | #include <openssl/rand.h> | |
363b1e5d | 17 | #include <openssl/core_dispatch.h> |
2741128e | 18 | #include <openssl/proverr.h> |
8bf36651 | 19 | #include "internal/thread_once.h" |
ddd21319 | 20 | #include "prov/providercommon.h" |
f000e828 P |
21 | #include "prov/provider_ctx.h" |
22 | #include "prov/provider_util.h" | |
23 | #include "prov/implementations.h" | |
f000e828 P |
24 | #include "drbg_local.h" |
25 | ||
363b1e5d DMSP |
26 | static OSSL_FUNC_rand_newctx_fn drbg_hash_new_wrapper; |
27 | static OSSL_FUNC_rand_freectx_fn drbg_hash_free; | |
28 | static OSSL_FUNC_rand_instantiate_fn drbg_hash_instantiate_wrapper; | |
29 | static OSSL_FUNC_rand_uninstantiate_fn drbg_hash_uninstantiate_wrapper; | |
30 | static OSSL_FUNC_rand_generate_fn drbg_hash_generate_wrapper; | |
31 | static OSSL_FUNC_rand_reseed_fn drbg_hash_reseed_wrapper; | |
32 | static OSSL_FUNC_rand_settable_ctx_params_fn drbg_hash_settable_ctx_params; | |
33 | static OSSL_FUNC_rand_set_ctx_params_fn drbg_hash_set_ctx_params; | |
34 | static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_hash_gettable_ctx_params; | |
35 | static OSSL_FUNC_rand_get_ctx_params_fn drbg_hash_get_ctx_params; | |
36 | static OSSL_FUNC_rand_verify_zeroization_fn drbg_hash_verify_zeroization; | |
f000e828 | 37 | |
189ad3ab MC |
38 | static int drbg_hash_set_ctx_params_locked(void *vctx, const OSSL_PARAM params[]); |
39 | ||
f000e828 P |
40 | /* 888 bits from SP800-90Ar1 10.1 table 2 */ |
41 | #define HASH_PRNG_MAX_SEEDLEN (888/8) | |
8bf36651 SL |
42 | |
43 | /* 440 bits from SP800-90Ar1 10.1 table 2 */ | |
44 | #define HASH_PRNG_SMALL_SEEDLEN (440/8) | |
f000e828 | 45 | |
8bf36651 SL |
46 | /* Determine what seedlen to use based on the block length */ |
47 | #define MAX_BLOCKLEN_USING_SMALL_SEEDLEN (256/8) | |
48 | #define INBYTE_IGNORE ((unsigned char)0xFF) | |
49 | ||
f000e828 P |
50 | typedef struct rand_drbg_hash_st { |
51 | PROV_DIGEST digest; | |
52 | EVP_MD_CTX *ctx; | |
53 | size_t blocklen; | |
54 | unsigned char V[HASH_PRNG_MAX_SEEDLEN]; | |
55 | unsigned char C[HASH_PRNG_MAX_SEEDLEN]; | |
56 | /* Temporary value storage: should always exceed max digest length */ | |
57 | unsigned char vtmp[HASH_PRNG_MAX_SEEDLEN]; | |
58 | } PROV_DRBG_HASH; | |
8bf36651 SL |
59 | |
60 | /* | |
61 | * SP800-90Ar1 10.3.1 Derivation function using a Hash Function (Hash_df). | |
62 | * The input string used is composed of: | |
63 | * inbyte - An optional leading byte (ignore if equal to INBYTE_IGNORE) | |
64 | * in - input string 1 (A Non NULL value). | |
65 | * in2 - optional input string (Can be NULL). | |
66 | * in3 - optional input string (Can be NULL). | |
67 | * These are concatenated as part of the DigestUpdate process. | |
68 | */ | |
f000e828 | 69 | static int hash_df(PROV_DRBG *drbg, unsigned char *out, |
8bf36651 SL |
70 | const unsigned char inbyte, |
71 | const unsigned char *in, size_t inlen, | |
72 | const unsigned char *in2, size_t in2len, | |
73 | const unsigned char *in3, size_t in3len) | |
74 | { | |
f000e828 | 75 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
76 | EVP_MD_CTX *ctx = hash->ctx; |
77 | unsigned char *vtmp = hash->vtmp; | |
78 | /* tmp = counter || num_bits_returned || [inbyte] */ | |
79 | unsigned char tmp[1 + 4 + 1]; | |
80 | int tmp_sz = 0; | |
81 | size_t outlen = drbg->seedlen; | |
82 | size_t num_bits_returned = outlen * 8; | |
83 | /* | |
84 | * No need to check outlen size here, as the standard only ever needs | |
85 | * seedlen bytes which is always less than the maximum permitted. | |
86 | */ | |
87 | ||
88 | /* (Step 3) counter = 1 (tmp[0] is the 8 bit counter) */ | |
89 | tmp[tmp_sz++] = 1; | |
90 | /* tmp[1..4] is the fixed 32 bit no_of_bits_to_return */ | |
91 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 24) & 0xff); | |
92 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 16) & 0xff); | |
93 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 8) & 0xff); | |
94 | tmp[tmp_sz++] = (unsigned char)(num_bits_returned & 0xff); | |
95 | /* Tack the additional input byte onto the end of tmp if it exists */ | |
96 | if (inbyte != INBYTE_IGNORE) | |
97 | tmp[tmp_sz++] = inbyte; | |
98 | ||
99 | /* (Step 4) */ | |
100 | for (;;) { | |
101 | /* | |
102 | * (Step 4.1) out = out || Hash(tmp || in || [in2] || [in3]) | |
103 | * (where tmp = counter || num_bits_returned || [inbyte]) | |
104 | */ | |
f000e828 | 105 | if (!(EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) |
8bf36651 SL |
106 | && EVP_DigestUpdate(ctx, tmp, tmp_sz) |
107 | && EVP_DigestUpdate(ctx, in, inlen) | |
108 | && (in2 == NULL || EVP_DigestUpdate(ctx, in2, in2len)) | |
109 | && (in3 == NULL || EVP_DigestUpdate(ctx, in3, in3len)))) | |
110 | return 0; | |
111 | ||
112 | if (outlen < hash->blocklen) { | |
113 | if (!EVP_DigestFinal(ctx, vtmp, NULL)) | |
114 | return 0; | |
115 | memcpy(out, vtmp, outlen); | |
116 | OPENSSL_cleanse(vtmp, hash->blocklen); | |
117 | break; | |
1287dabd | 118 | } else if (!EVP_DigestFinal(ctx, out, NULL)) { |
8bf36651 SL |
119 | return 0; |
120 | } | |
121 | ||
122 | outlen -= hash->blocklen; | |
123 | if (outlen == 0) | |
124 | break; | |
125 | /* (Step 4.2) counter++ */ | |
126 | tmp[0]++; | |
127 | out += hash->blocklen; | |
128 | } | |
129 | return 1; | |
130 | } | |
131 | ||
132 | /* Helper function that just passes 2 input parameters to hash_df() */ | |
f000e828 | 133 | static int hash_df1(PROV_DRBG *drbg, unsigned char *out, |
8bf36651 SL |
134 | const unsigned char in_byte, |
135 | const unsigned char *in1, size_t in1len) | |
136 | { | |
137 | return hash_df(drbg, out, in_byte, in1, in1len, NULL, 0, NULL, 0); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Add 2 byte buffers together. The first elements in each buffer are the top | |
142 | * most bytes. The result is stored in the dst buffer. | |
143 | * The final carry is ignored i.e: dst = (dst + in) mod (2^seedlen_bits). | |
144 | * where dst size is drbg->seedlen, and inlen <= drbg->seedlen. | |
145 | */ | |
f000e828 | 146 | static int add_bytes(PROV_DRBG *drbg, unsigned char *dst, |
8bf36651 SL |
147 | unsigned char *in, size_t inlen) |
148 | { | |
149 | size_t i; | |
150 | int result; | |
151 | const unsigned char *add; | |
152 | unsigned char carry = 0, *d; | |
153 | ||
154 | assert(drbg->seedlen >= 1 && inlen >= 1 && inlen <= drbg->seedlen); | |
155 | ||
156 | d = &dst[drbg->seedlen - 1]; | |
157 | add = &in[inlen - 1]; | |
158 | ||
159 | for (i = inlen; i > 0; i--, d--, add--) { | |
160 | result = *d + *add + carry; | |
161 | carry = (unsigned char)(result >> 8); | |
162 | *d = (unsigned char)(result & 0xff); | |
163 | } | |
164 | ||
165 | if (carry != 0) { | |
166 | /* Add the carry to the top of the dst if inlen is not the same size */ | |
167 | for (i = drbg->seedlen - inlen; i > 0; --i, d--) { | |
168 | *d += 1; /* Carry can only be 1 */ | |
169 | if (*d != 0) /* exit if carry doesnt propagate to the next byte */ | |
170 | break; | |
171 | } | |
172 | } | |
173 | return 1; | |
174 | } | |
175 | ||
176 | /* V = (V + Hash(inbyte || V || [additional_input]) mod (2^seedlen) */ | |
f000e828 | 177 | static int add_hash_to_v(PROV_DRBG *drbg, unsigned char inbyte, |
8bf36651 SL |
178 | const unsigned char *adin, size_t adinlen) |
179 | { | |
f000e828 | 180 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
181 | EVP_MD_CTX *ctx = hash->ctx; |
182 | ||
f000e828 | 183 | return EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) |
8bf36651 SL |
184 | && EVP_DigestUpdate(ctx, &inbyte, 1) |
185 | && EVP_DigestUpdate(ctx, hash->V, drbg->seedlen) | |
186 | && (adin == NULL || EVP_DigestUpdate(ctx, adin, adinlen)) | |
187 | && EVP_DigestFinal(ctx, hash->vtmp, NULL) | |
188 | && add_bytes(drbg, hash->V, hash->vtmp, hash->blocklen); | |
189 | } | |
190 | ||
191 | /* | |
192 | * The Hashgen() as listed in SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process. | |
193 | * | |
194 | * drbg contains the current value of V. | |
195 | * outlen is the requested number of bytes. | |
196 | * out is a buffer to return the generated bits. | |
197 | * | |
198 | * The algorithm to generate the bits is: | |
199 | * data = V | |
200 | * w = NULL | |
201 | * for (i = 1 to m) { | |
202 | * W = W || Hash(data) | |
203 | * data = (data + 1) mod (2^seedlen) | |
204 | * } | |
205 | * out = Leftmost(W, outlen) | |
206 | * | |
207 | * Returns zero if an error occurs otherwise it returns 1. | |
208 | */ | |
f000e828 | 209 | static int hash_gen(PROV_DRBG *drbg, unsigned char *out, size_t outlen) |
8bf36651 | 210 | { |
f000e828 | 211 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
212 | unsigned char one = 1; |
213 | ||
214 | if (outlen == 0) | |
215 | return 1; | |
216 | memcpy(hash->vtmp, hash->V, drbg->seedlen); | |
1287dabd | 217 | for (;;) { |
f000e828 P |
218 | if (!EVP_DigestInit_ex(hash->ctx, ossl_prov_digest_md(&hash->digest), |
219 | NULL) | |
8bf36651 SL |
220 | || !EVP_DigestUpdate(hash->ctx, hash->vtmp, drbg->seedlen)) |
221 | return 0; | |
222 | ||
223 | if (outlen < hash->blocklen) { | |
224 | if (!EVP_DigestFinal(hash->ctx, hash->vtmp, NULL)) | |
225 | return 0; | |
226 | memcpy(out, hash->vtmp, outlen); | |
227 | return 1; | |
228 | } else { | |
229 | if (!EVP_DigestFinal(hash->ctx, out, NULL)) | |
230 | return 0; | |
231 | outlen -= hash->blocklen; | |
232 | if (outlen == 0) | |
233 | break; | |
234 | out += hash->blocklen; | |
235 | } | |
236 | add_bytes(drbg, hash->vtmp, &one, 1); | |
237 | } | |
238 | return 1; | |
239 | } | |
240 | ||
241 | /* | |
242 | * SP800-90Ar1 10.1.1.2 Hash_DRBG_Instantiate_Process: | |
243 | * | |
244 | * ent is entropy input obtained from a randomness source of length ent_len. | |
245 | * nonce is a string of bytes of length nonce_len. | |
246 | * pstr is a personalization string received from an application. May be NULL. | |
247 | * | |
248 | * Returns zero if an error occurs otherwise it returns 1. | |
249 | */ | |
f000e828 | 250 | static int drbg_hash_instantiate(PROV_DRBG *drbg, |
8bf36651 SL |
251 | const unsigned char *ent, size_t ent_len, |
252 | const unsigned char *nonce, size_t nonce_len, | |
253 | const unsigned char *pstr, size_t pstr_len) | |
254 | { | |
f000e828 P |
255 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
256 | ||
257 | EVP_MD_CTX_free(hash->ctx); | |
258 | hash->ctx = EVP_MD_CTX_new(); | |
8bf36651 SL |
259 | |
260 | /* (Step 1-3) V = Hash_df(entropy||nonce||pers, seedlen) */ | |
f000e828 P |
261 | return hash->ctx != NULL |
262 | && hash_df(drbg, hash->V, INBYTE_IGNORE, | |
263 | ent, ent_len, nonce, nonce_len, pstr, pstr_len) | |
8bf36651 SL |
264 | /* (Step 4) C = Hash_df(0x00||V, seedlen) */ |
265 | && hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); | |
266 | } | |
267 | ||
f000e828 P |
268 | static int drbg_hash_instantiate_wrapper(void *vdrbg, unsigned int strength, |
269 | int prediction_resistance, | |
270 | const unsigned char *pstr, | |
b98d550d P |
271 | size_t pstr_len, |
272 | const OSSL_PARAM params[]) | |
f000e828 P |
273 | { |
274 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
189ad3ab | 275 | int ret = 0; |
f000e828 | 276 | |
189ad3ab | 277 | if (drbg->lock != NULL && !CRYPTO_THREAD_write_lock(drbg->lock)) |
b98d550d | 278 | return 0; |
189ad3ab MC |
279 | |
280 | if (!ossl_prov_is_running() | |
281 | || !drbg_hash_set_ctx_params_locked(drbg, params)) | |
282 | goto err; | |
283 | ret = ossl_prov_drbg_instantiate(drbg, strength, prediction_resistance, | |
284 | pstr, pstr_len); | |
285 | err: | |
286 | if (drbg->lock != NULL) | |
287 | CRYPTO_THREAD_unlock(drbg->lock); | |
288 | return ret; | |
f000e828 P |
289 | } |
290 | ||
8bf36651 SL |
291 | /* |
292 | * SP800-90Ar1 10.1.1.3 Hash_DRBG_Reseed_Process: | |
293 | * | |
294 | * ent is entropy input bytes obtained from a randomness source. | |
295 | * addin is additional input received from an application. May be NULL. | |
296 | * | |
297 | * Returns zero if an error occurs otherwise it returns 1. | |
298 | */ | |
f000e828 | 299 | static int drbg_hash_reseed(PROV_DRBG *drbg, |
8bf36651 SL |
300 | const unsigned char *ent, size_t ent_len, |
301 | const unsigned char *adin, size_t adin_len) | |
302 | { | |
f000e828 | 303 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 | 304 | |
f000e828 | 305 | /* (Step 1-2) V = Hash_df(0x01 || V || entropy_input || additional_input) */ |
8bf36651 SL |
306 | /* V about to be updated so use C as output instead */ |
307 | if (!hash_df(drbg, hash->C, 0x01, hash->V, drbg->seedlen, ent, ent_len, | |
308 | adin, adin_len)) | |
309 | return 0; | |
310 | memcpy(hash->V, hash->C, drbg->seedlen); | |
311 | /* (Step 4) C = Hash_df(0x00||V, seedlen) */ | |
312 | return hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); | |
313 | } | |
314 | ||
f000e828 P |
315 | static int drbg_hash_reseed_wrapper(void *vdrbg, int prediction_resistance, |
316 | const unsigned char *ent, size_t ent_len, | |
317 | const unsigned char *adin, size_t adin_len) | |
318 | { | |
319 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
320 | ||
7d6766cb P |
321 | return ossl_prov_drbg_reseed(drbg, prediction_resistance, ent, ent_len, |
322 | adin, adin_len); | |
f000e828 P |
323 | } |
324 | ||
8bf36651 SL |
325 | /* |
326 | * SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process: | |
327 | * | |
328 | * Generates pseudo random bytes using the drbg. | |
329 | * out is a buffer to fill with outlen bytes of pseudo random data. | |
330 | * addin is additional input received from an application. May be NULL. | |
331 | * | |
332 | * Returns zero if an error occurs otherwise it returns 1. | |
333 | */ | |
f000e828 | 334 | static int drbg_hash_generate(PROV_DRBG *drbg, |
8bf36651 SL |
335 | unsigned char *out, size_t outlen, |
336 | const unsigned char *adin, size_t adin_len) | |
337 | { | |
f000e828 | 338 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 | 339 | unsigned char counter[4]; |
b0614f0a | 340 | int reseed_counter = drbg->generate_counter; |
8bf36651 SL |
341 | |
342 | counter[0] = (unsigned char)((reseed_counter >> 24) & 0xff); | |
343 | counter[1] = (unsigned char)((reseed_counter >> 16) & 0xff); | |
344 | counter[2] = (unsigned char)((reseed_counter >> 8) & 0xff); | |
345 | counter[3] = (unsigned char)(reseed_counter & 0xff); | |
346 | ||
f000e828 P |
347 | return hash->ctx != NULL |
348 | && (adin == NULL | |
8bf36651 | 349 | /* (Step 2) if adin != NULL then V = V + Hash(0x02||V||adin) */ |
f000e828 P |
350 | || adin_len == 0 |
351 | || add_hash_to_v(drbg, 0x02, adin, adin_len)) | |
8bf36651 SL |
352 | /* (Step 3) Hashgen(outlen, V) */ |
353 | && hash_gen(drbg, out, outlen) | |
354 | /* (Step 4/5) H = V = (V + Hash(0x03||V) mod (2^seedlen_bits) */ | |
355 | && add_hash_to_v(drbg, 0x03, NULL, 0) | |
356 | /* (Step 5) V = (V + H + C + reseed_counter) mod (2^seedlen_bits) */ | |
357 | /* V = (V + C) mod (2^seedlen_bits) */ | |
358 | && add_bytes(drbg, hash->V, hash->C, drbg->seedlen) | |
359 | /* V = (V + reseed_counter) mod (2^seedlen_bits) */ | |
360 | && add_bytes(drbg, hash->V, counter, 4); | |
361 | } | |
362 | ||
f000e828 P |
363 | static int drbg_hash_generate_wrapper |
364 | (void *vdrbg, unsigned char *out, size_t outlen, unsigned int strength, | |
365 | int prediction_resistance, const unsigned char *adin, size_t adin_len) | |
8bf36651 | 366 | { |
f000e828 P |
367 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; |
368 | ||
7d6766cb P |
369 | return ossl_prov_drbg_generate(drbg, out, outlen, strength, |
370 | prediction_resistance, adin, adin_len); | |
8bf36651 SL |
371 | } |
372 | ||
f000e828 P |
373 | static int drbg_hash_uninstantiate(PROV_DRBG *drbg) |
374 | { | |
375 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; | |
8bf36651 | 376 | |
f000e828 P |
377 | OPENSSL_cleanse(hash->V, sizeof(hash->V)); |
378 | OPENSSL_cleanse(hash->C, sizeof(hash->C)); | |
379 | OPENSSL_cleanse(hash->vtmp, sizeof(hash->vtmp)); | |
7d6766cb | 380 | return ossl_prov_drbg_uninstantiate(drbg); |
f000e828 P |
381 | } |
382 | ||
383 | static int drbg_hash_uninstantiate_wrapper(void *vdrbg) | |
8bf36651 | 384 | { |
189ad3ab MC |
385 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; |
386 | int ret; | |
387 | ||
388 | if (drbg->lock != NULL && !CRYPTO_THREAD_write_lock(drbg->lock)) | |
389 | return 0; | |
390 | ||
391 | ret = drbg_hash_uninstantiate(drbg); | |
392 | ||
393 | if (drbg->lock != NULL) | |
394 | CRYPTO_THREAD_unlock(drbg->lock); | |
395 | ||
396 | return ret; | |
f000e828 | 397 | } |
8bf36651 | 398 | |
f000e828 P |
399 | static int drbg_hash_verify_zeroization(void *vdrbg) |
400 | { | |
401 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
402 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; | |
189ad3ab MC |
403 | int ret = 0; |
404 | ||
405 | if (drbg->lock != NULL && !CRYPTO_THREAD_read_lock(drbg->lock)) | |
406 | return 0; | |
8bf36651 | 407 | |
f000e828 P |
408 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->V); |
409 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->C); | |
410 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->vtmp); | |
189ad3ab MC |
411 | |
412 | ret = 1; | |
413 | err: | |
414 | if (drbg->lock != NULL) | |
415 | CRYPTO_THREAD_unlock(drbg->lock); | |
416 | return ret; | |
f000e828 P |
417 | } |
418 | ||
419 | static int drbg_hash_new(PROV_DRBG *ctx) | |
420 | { | |
421 | PROV_DRBG_HASH *hash; | |
422 | ||
423 | hash = OPENSSL_secure_zalloc(sizeof(*hash)); | |
e077455e | 424 | if (hash == NULL) |
5d0cf102 | 425 | return 0; |
57ca171a | 426 | |
f000e828 P |
427 | ctx->data = hash; |
428 | ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; | |
429 | ctx->max_entropylen = DRBG_MAX_LENGTH; | |
430 | ctx->max_noncelen = DRBG_MAX_LENGTH; | |
431 | ctx->max_perslen = DRBG_MAX_LENGTH; | |
432 | ctx->max_adinlen = DRBG_MAX_LENGTH; | |
8bf36651 | 433 | |
f000e828 P |
434 | /* Maximum number of bits per request = 2^19 = 2^16 bytes */ |
435 | ctx->max_request = 1 << 16; | |
436 | return 1; | |
437 | } | |
438 | ||
439 | static void *drbg_hash_new_wrapper(void *provctx, void *parent, | |
440 | const OSSL_DISPATCH *parent_dispatch) | |
441 | { | |
1dc188ba | 442 | return ossl_rand_drbg_new(provctx, parent, parent_dispatch, &drbg_hash_new, |
f000e828 P |
443 | &drbg_hash_instantiate, &drbg_hash_uninstantiate, |
444 | &drbg_hash_reseed, &drbg_hash_generate); | |
445 | } | |
446 | ||
447 | static void drbg_hash_free(void *vdrbg) | |
448 | { | |
449 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
450 | PROV_DRBG_HASH *hash; | |
451 | ||
452 | if (drbg != NULL && (hash = (PROV_DRBG_HASH *)drbg->data) != NULL) { | |
453 | EVP_MD_CTX_free(hash->ctx); | |
454 | ossl_prov_digest_reset(&hash->digest); | |
455 | OPENSSL_secure_clear_free(hash, sizeof(*hash)); | |
8bf36651 | 456 | } |
1dc188ba | 457 | ossl_rand_drbg_free(drbg); |
f000e828 P |
458 | } |
459 | ||
460 | static int drbg_hash_get_ctx_params(void *vdrbg, OSSL_PARAM params[]) | |
461 | { | |
462 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
0ed26fb6 P |
463 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
464 | const EVP_MD *md; | |
465 | OSSL_PARAM *p; | |
61f11cad MC |
466 | int ret = 0, complete = 0; |
467 | ||
468 | if (!ossl_drbg_get_ctx_params_no_lock(drbg, params, &complete)) | |
469 | return 0; | |
470 | ||
471 | if (complete) | |
472 | return 1; | |
189ad3ab MC |
473 | |
474 | if (drbg->lock != NULL && !CRYPTO_THREAD_read_lock(drbg->lock)) | |
475 | return 0; | |
0ed26fb6 P |
476 | |
477 | p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_DIGEST); | |
478 | if (p != NULL) { | |
479 | md = ossl_prov_digest_md(&hash->digest); | |
ed576acd | 480 | if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_get0_name(md))) |
189ad3ab | 481 | goto err; |
0ed26fb6 | 482 | } |
f000e828 | 483 | |
189ad3ab MC |
484 | ret = ossl_drbg_get_ctx_params(drbg, params); |
485 | err: | |
486 | if (drbg->lock != NULL) | |
487 | CRYPTO_THREAD_unlock(drbg->lock); | |
488 | ||
489 | return ret; | |
f000e828 | 490 | } |
8bf36651 | 491 | |
a3f091fd P |
492 | static const OSSL_PARAM *drbg_hash_gettable_ctx_params(ossl_unused void *vctx, |
493 | ossl_unused void *p_ctx) | |
f000e828 P |
494 | { |
495 | static const OSSL_PARAM known_gettable_ctx_params[] = { | |
0ed26fb6 | 496 | OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0), |
82a7b2fb | 497 | OSSL_PARAM_DRBG_GETTABLE_CTX_COMMON, |
f000e828 P |
498 | OSSL_PARAM_END |
499 | }; | |
500 | return known_gettable_ctx_params; | |
501 | } | |
57ca171a | 502 | |
189ad3ab | 503 | static int drbg_hash_set_ctx_params_locked(void *vctx, const OSSL_PARAM params[]) |
f000e828 P |
504 | { |
505 | PROV_DRBG *ctx = (PROV_DRBG *)vctx; | |
506 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)ctx->data; | |
a829b735 | 507 | OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx); |
f000e828 | 508 | const EVP_MD *md; |
8bf36651 | 509 | |
f000e828 P |
510 | if (!ossl_prov_digest_load_from_params(&hash->digest, params, libctx)) |
511 | return 0; | |
8bf36651 | 512 | |
f000e828 P |
513 | md = ossl_prov_digest_md(&hash->digest); |
514 | if (md != NULL) { | |
f553c0f0 P |
515 | if (!ossl_drbg_verify_digest(libctx, md)) |
516 | return 0; /* Error already raised for us */ | |
8bf36651 | 517 | |
f000e828 | 518 | /* These are taken from SP 800-90 10.1 Table 2 */ |
ed576acd | 519 | hash->blocklen = EVP_MD_get_size(md); |
f000e828 P |
520 | /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */ |
521 | ctx->strength = 64 * (hash->blocklen >> 3); | |
522 | if (ctx->strength > 256) | |
523 | ctx->strength = 256; | |
524 | if (hash->blocklen > MAX_BLOCKLEN_USING_SMALL_SEEDLEN) | |
525 | ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; | |
526 | else | |
527 | ctx->seedlen = HASH_PRNG_SMALL_SEEDLEN; | |
528 | ||
529 | ctx->min_entropylen = ctx->strength / 8; | |
530 | ctx->min_noncelen = ctx->min_entropylen / 2; | |
531 | } | |
8bf36651 | 532 | |
b24d6c33 | 533 | return ossl_drbg_set_ctx_params(ctx, params); |
f000e828 | 534 | } |
8bf36651 | 535 | |
189ad3ab MC |
536 | static int drbg_hash_set_ctx_params(void *vctx, const OSSL_PARAM params[]) |
537 | { | |
538 | PROV_DRBG *drbg = (PROV_DRBG *)vctx; | |
539 | int ret; | |
540 | ||
541 | if (drbg->lock != NULL && !CRYPTO_THREAD_write_lock(drbg->lock)) | |
542 | return 0; | |
543 | ||
544 | ret = drbg_hash_set_ctx_params_locked(vctx, params); | |
545 | ||
546 | if (drbg->lock != NULL) | |
547 | CRYPTO_THREAD_unlock(drbg->lock); | |
548 | ||
549 | return ret; | |
550 | } | |
551 | ||
a3f091fd P |
552 | static const OSSL_PARAM *drbg_hash_settable_ctx_params(ossl_unused void *vctx, |
553 | ossl_unused void *p_ctx) | |
f000e828 P |
554 | { |
555 | static const OSSL_PARAM known_settable_ctx_params[] = { | |
556 | OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0), | |
557 | OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0), | |
82a7b2fb | 558 | OSSL_PARAM_DRBG_SETTABLE_CTX_COMMON, |
f000e828 P |
559 | OSSL_PARAM_END |
560 | }; | |
561 | return known_settable_ctx_params; | |
8bf36651 | 562 | } |
f000e828 | 563 | |
1be63951 | 564 | const OSSL_DISPATCH ossl_drbg_hash_functions[] = { |
f000e828 P |
565 | { OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_hash_new_wrapper }, |
566 | { OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_hash_free }, | |
567 | { OSSL_FUNC_RAND_INSTANTIATE, | |
568 | (void(*)(void))drbg_hash_instantiate_wrapper }, | |
569 | { OSSL_FUNC_RAND_UNINSTANTIATE, | |
570 | (void(*)(void))drbg_hash_uninstantiate_wrapper }, | |
571 | { OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_hash_generate_wrapper }, | |
572 | { OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_hash_reseed_wrapper }, | |
b24d6c33 P |
573 | { OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))ossl_drbg_enable_locking }, |
574 | { OSSL_FUNC_RAND_LOCK, (void(*)(void))ossl_drbg_lock }, | |
575 | { OSSL_FUNC_RAND_UNLOCK, (void(*)(void))ossl_drbg_unlock }, | |
f000e828 P |
576 | { OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS, |
577 | (void(*)(void))drbg_hash_settable_ctx_params }, | |
578 | { OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_hash_set_ctx_params }, | |
579 | { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS, | |
580 | (void(*)(void))drbg_hash_gettable_ctx_params }, | |
581 | { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_hash_get_ctx_params }, | |
f000e828 P |
582 | { OSSL_FUNC_RAND_VERIFY_ZEROIZATION, |
583 | (void(*)(void))drbg_hash_verify_zeroization }, | |
335e85f5 P |
584 | { OSSL_FUNC_RAND_GET_SEED, (void(*)(void))ossl_drbg_get_seed }, |
585 | { OSSL_FUNC_RAND_CLEAR_SEED, (void(*)(void))ossl_drbg_clear_seed }, | |
1e6bd31e | 586 | OSSL_DISPATCH_END |
f000e828 | 587 | }; |