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8bf36651 SL |
1 | /* |
2 | * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved. | |
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> |
8bf36651 | 18 | #include "internal/thread_once.h" |
ddd21319 | 19 | #include "prov/providercommon.h" |
f000e828 P |
20 | #include "prov/provider_ctx.h" |
21 | #include "prov/provider_util.h" | |
22 | #include "prov/implementations.h" | |
23 | #include "prov/providercommonerr.h" | |
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 P |
37 | |
38 | /* 888 bits from SP800-90Ar1 10.1 table 2 */ | |
39 | #define HASH_PRNG_MAX_SEEDLEN (888/8) | |
8bf36651 SL |
40 | |
41 | /* 440 bits from SP800-90Ar1 10.1 table 2 */ | |
42 | #define HASH_PRNG_SMALL_SEEDLEN (440/8) | |
f000e828 | 43 | |
8bf36651 SL |
44 | /* Determine what seedlen to use based on the block length */ |
45 | #define MAX_BLOCKLEN_USING_SMALL_SEEDLEN (256/8) | |
46 | #define INBYTE_IGNORE ((unsigned char)0xFF) | |
47 | ||
f000e828 P |
48 | typedef struct rand_drbg_hash_st { |
49 | PROV_DIGEST digest; | |
50 | EVP_MD_CTX *ctx; | |
51 | size_t blocklen; | |
52 | unsigned char V[HASH_PRNG_MAX_SEEDLEN]; | |
53 | unsigned char C[HASH_PRNG_MAX_SEEDLEN]; | |
54 | /* Temporary value storage: should always exceed max digest length */ | |
55 | unsigned char vtmp[HASH_PRNG_MAX_SEEDLEN]; | |
56 | } PROV_DRBG_HASH; | |
8bf36651 SL |
57 | |
58 | /* | |
59 | * SP800-90Ar1 10.3.1 Derivation function using a Hash Function (Hash_df). | |
60 | * The input string used is composed of: | |
61 | * inbyte - An optional leading byte (ignore if equal to INBYTE_IGNORE) | |
62 | * in - input string 1 (A Non NULL value). | |
63 | * in2 - optional input string (Can be NULL). | |
64 | * in3 - optional input string (Can be NULL). | |
65 | * These are concatenated as part of the DigestUpdate process. | |
66 | */ | |
f000e828 | 67 | static int hash_df(PROV_DRBG *drbg, unsigned char *out, |
8bf36651 SL |
68 | const unsigned char inbyte, |
69 | const unsigned char *in, size_t inlen, | |
70 | const unsigned char *in2, size_t in2len, | |
71 | const unsigned char *in3, size_t in3len) | |
72 | { | |
f000e828 | 73 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
74 | EVP_MD_CTX *ctx = hash->ctx; |
75 | unsigned char *vtmp = hash->vtmp; | |
76 | /* tmp = counter || num_bits_returned || [inbyte] */ | |
77 | unsigned char tmp[1 + 4 + 1]; | |
78 | int tmp_sz = 0; | |
79 | size_t outlen = drbg->seedlen; | |
80 | size_t num_bits_returned = outlen * 8; | |
81 | /* | |
82 | * No need to check outlen size here, as the standard only ever needs | |
83 | * seedlen bytes which is always less than the maximum permitted. | |
84 | */ | |
85 | ||
86 | /* (Step 3) counter = 1 (tmp[0] is the 8 bit counter) */ | |
87 | tmp[tmp_sz++] = 1; | |
88 | /* tmp[1..4] is the fixed 32 bit no_of_bits_to_return */ | |
89 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 24) & 0xff); | |
90 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 16) & 0xff); | |
91 | tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 8) & 0xff); | |
92 | tmp[tmp_sz++] = (unsigned char)(num_bits_returned & 0xff); | |
93 | /* Tack the additional input byte onto the end of tmp if it exists */ | |
94 | if (inbyte != INBYTE_IGNORE) | |
95 | tmp[tmp_sz++] = inbyte; | |
96 | ||
97 | /* (Step 4) */ | |
98 | for (;;) { | |
99 | /* | |
100 | * (Step 4.1) out = out || Hash(tmp || in || [in2] || [in3]) | |
101 | * (where tmp = counter || num_bits_returned || [inbyte]) | |
102 | */ | |
f000e828 | 103 | if (!(EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) |
8bf36651 SL |
104 | && EVP_DigestUpdate(ctx, tmp, tmp_sz) |
105 | && EVP_DigestUpdate(ctx, in, inlen) | |
106 | && (in2 == NULL || EVP_DigestUpdate(ctx, in2, in2len)) | |
107 | && (in3 == NULL || EVP_DigestUpdate(ctx, in3, in3len)))) | |
108 | return 0; | |
109 | ||
110 | if (outlen < hash->blocklen) { | |
111 | if (!EVP_DigestFinal(ctx, vtmp, NULL)) | |
112 | return 0; | |
113 | memcpy(out, vtmp, outlen); | |
114 | OPENSSL_cleanse(vtmp, hash->blocklen); | |
115 | break; | |
116 | } else if(!EVP_DigestFinal(ctx, out, NULL)) { | |
117 | return 0; | |
118 | } | |
119 | ||
120 | outlen -= hash->blocklen; | |
121 | if (outlen == 0) | |
122 | break; | |
123 | /* (Step 4.2) counter++ */ | |
124 | tmp[0]++; | |
125 | out += hash->blocklen; | |
126 | } | |
127 | return 1; | |
128 | } | |
129 | ||
130 | /* Helper function that just passes 2 input parameters to hash_df() */ | |
f000e828 | 131 | static int hash_df1(PROV_DRBG *drbg, unsigned char *out, |
8bf36651 SL |
132 | const unsigned char in_byte, |
133 | const unsigned char *in1, size_t in1len) | |
134 | { | |
135 | return hash_df(drbg, out, in_byte, in1, in1len, NULL, 0, NULL, 0); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Add 2 byte buffers together. The first elements in each buffer are the top | |
140 | * most bytes. The result is stored in the dst buffer. | |
141 | * The final carry is ignored i.e: dst = (dst + in) mod (2^seedlen_bits). | |
142 | * where dst size is drbg->seedlen, and inlen <= drbg->seedlen. | |
143 | */ | |
f000e828 | 144 | static int add_bytes(PROV_DRBG *drbg, unsigned char *dst, |
8bf36651 SL |
145 | unsigned char *in, size_t inlen) |
146 | { | |
147 | size_t i; | |
148 | int result; | |
149 | const unsigned char *add; | |
150 | unsigned char carry = 0, *d; | |
151 | ||
152 | assert(drbg->seedlen >= 1 && inlen >= 1 && inlen <= drbg->seedlen); | |
153 | ||
154 | d = &dst[drbg->seedlen - 1]; | |
155 | add = &in[inlen - 1]; | |
156 | ||
157 | for (i = inlen; i > 0; i--, d--, add--) { | |
158 | result = *d + *add + carry; | |
159 | carry = (unsigned char)(result >> 8); | |
160 | *d = (unsigned char)(result & 0xff); | |
161 | } | |
162 | ||
163 | if (carry != 0) { | |
164 | /* Add the carry to the top of the dst if inlen is not the same size */ | |
165 | for (i = drbg->seedlen - inlen; i > 0; --i, d--) { | |
166 | *d += 1; /* Carry can only be 1 */ | |
167 | if (*d != 0) /* exit if carry doesnt propagate to the next byte */ | |
168 | break; | |
169 | } | |
170 | } | |
171 | return 1; | |
172 | } | |
173 | ||
174 | /* V = (V + Hash(inbyte || V || [additional_input]) mod (2^seedlen) */ | |
f000e828 | 175 | static int add_hash_to_v(PROV_DRBG *drbg, unsigned char inbyte, |
8bf36651 SL |
176 | const unsigned char *adin, size_t adinlen) |
177 | { | |
f000e828 | 178 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
179 | EVP_MD_CTX *ctx = hash->ctx; |
180 | ||
f000e828 | 181 | return EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) |
8bf36651 SL |
182 | && EVP_DigestUpdate(ctx, &inbyte, 1) |
183 | && EVP_DigestUpdate(ctx, hash->V, drbg->seedlen) | |
184 | && (adin == NULL || EVP_DigestUpdate(ctx, adin, adinlen)) | |
185 | && EVP_DigestFinal(ctx, hash->vtmp, NULL) | |
186 | && add_bytes(drbg, hash->V, hash->vtmp, hash->blocklen); | |
187 | } | |
188 | ||
189 | /* | |
190 | * The Hashgen() as listed in SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process. | |
191 | * | |
192 | * drbg contains the current value of V. | |
193 | * outlen is the requested number of bytes. | |
194 | * out is a buffer to return the generated bits. | |
195 | * | |
196 | * The algorithm to generate the bits is: | |
197 | * data = V | |
198 | * w = NULL | |
199 | * for (i = 1 to m) { | |
200 | * W = W || Hash(data) | |
201 | * data = (data + 1) mod (2^seedlen) | |
202 | * } | |
203 | * out = Leftmost(W, outlen) | |
204 | * | |
205 | * Returns zero if an error occurs otherwise it returns 1. | |
206 | */ | |
f000e828 | 207 | static int hash_gen(PROV_DRBG *drbg, unsigned char *out, size_t outlen) |
8bf36651 | 208 | { |
f000e828 | 209 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
210 | unsigned char one = 1; |
211 | ||
212 | if (outlen == 0) | |
213 | return 1; | |
214 | memcpy(hash->vtmp, hash->V, drbg->seedlen); | |
215 | for(;;) { | |
f000e828 P |
216 | if (!EVP_DigestInit_ex(hash->ctx, ossl_prov_digest_md(&hash->digest), |
217 | NULL) | |
8bf36651 SL |
218 | || !EVP_DigestUpdate(hash->ctx, hash->vtmp, drbg->seedlen)) |
219 | return 0; | |
220 | ||
221 | if (outlen < hash->blocklen) { | |
222 | if (!EVP_DigestFinal(hash->ctx, hash->vtmp, NULL)) | |
223 | return 0; | |
224 | memcpy(out, hash->vtmp, outlen); | |
225 | return 1; | |
226 | } else { | |
227 | if (!EVP_DigestFinal(hash->ctx, out, NULL)) | |
228 | return 0; | |
229 | outlen -= hash->blocklen; | |
230 | if (outlen == 0) | |
231 | break; | |
232 | out += hash->blocklen; | |
233 | } | |
234 | add_bytes(drbg, hash->vtmp, &one, 1); | |
235 | } | |
236 | return 1; | |
237 | } | |
238 | ||
239 | /* | |
240 | * SP800-90Ar1 10.1.1.2 Hash_DRBG_Instantiate_Process: | |
241 | * | |
242 | * ent is entropy input obtained from a randomness source of length ent_len. | |
243 | * nonce is a string of bytes of length nonce_len. | |
244 | * pstr is a personalization string received from an application. May be NULL. | |
245 | * | |
246 | * Returns zero if an error occurs otherwise it returns 1. | |
247 | */ | |
f000e828 | 248 | static int drbg_hash_instantiate(PROV_DRBG *drbg, |
8bf36651 SL |
249 | const unsigned char *ent, size_t ent_len, |
250 | const unsigned char *nonce, size_t nonce_len, | |
251 | const unsigned char *pstr, size_t pstr_len) | |
252 | { | |
f000e828 P |
253 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
254 | ||
255 | EVP_MD_CTX_free(hash->ctx); | |
256 | hash->ctx = EVP_MD_CTX_new(); | |
8bf36651 SL |
257 | |
258 | /* (Step 1-3) V = Hash_df(entropy||nonce||pers, seedlen) */ | |
f000e828 P |
259 | return hash->ctx != NULL |
260 | && hash_df(drbg, hash->V, INBYTE_IGNORE, | |
261 | ent, ent_len, nonce, nonce_len, pstr, pstr_len) | |
8bf36651 SL |
262 | /* (Step 4) C = Hash_df(0x00||V, seedlen) */ |
263 | && hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); | |
264 | } | |
265 | ||
f000e828 P |
266 | static int drbg_hash_instantiate_wrapper(void *vdrbg, unsigned int strength, |
267 | int prediction_resistance, | |
268 | const unsigned char *pstr, | |
269 | size_t pstr_len) | |
270 | { | |
271 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
272 | ||
273 | return PROV_DRBG_instantiate(drbg, strength, prediction_resistance, | |
274 | pstr, pstr_len); | |
275 | } | |
276 | ||
8bf36651 SL |
277 | /* |
278 | * SP800-90Ar1 10.1.1.3 Hash_DRBG_Reseed_Process: | |
279 | * | |
280 | * ent is entropy input bytes obtained from a randomness source. | |
281 | * addin is additional input received from an application. May be NULL. | |
282 | * | |
283 | * Returns zero if an error occurs otherwise it returns 1. | |
284 | */ | |
f000e828 | 285 | static int drbg_hash_reseed(PROV_DRBG *drbg, |
8bf36651 SL |
286 | const unsigned char *ent, size_t ent_len, |
287 | const unsigned char *adin, size_t adin_len) | |
288 | { | |
f000e828 | 289 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 | 290 | |
f000e828 | 291 | /* (Step 1-2) V = Hash_df(0x01 || V || entropy_input || additional_input) */ |
8bf36651 SL |
292 | /* V about to be updated so use C as output instead */ |
293 | if (!hash_df(drbg, hash->C, 0x01, hash->V, drbg->seedlen, ent, ent_len, | |
294 | adin, adin_len)) | |
295 | return 0; | |
296 | memcpy(hash->V, hash->C, drbg->seedlen); | |
297 | /* (Step 4) C = Hash_df(0x00||V, seedlen) */ | |
298 | return hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); | |
299 | } | |
300 | ||
f000e828 P |
301 | static int drbg_hash_reseed_wrapper(void *vdrbg, int prediction_resistance, |
302 | const unsigned char *ent, size_t ent_len, | |
303 | const unsigned char *adin, size_t adin_len) | |
304 | { | |
305 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
306 | ||
307 | return PROV_DRBG_reseed(drbg, prediction_resistance, ent, ent_len, | |
308 | adin, adin_len); | |
309 | } | |
310 | ||
8bf36651 SL |
311 | /* |
312 | * SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process: | |
313 | * | |
314 | * Generates pseudo random bytes using the drbg. | |
315 | * out is a buffer to fill with outlen bytes of pseudo random data. | |
316 | * addin is additional input received from an application. May be NULL. | |
317 | * | |
318 | * Returns zero if an error occurs otherwise it returns 1. | |
319 | */ | |
f000e828 | 320 | static int drbg_hash_generate(PROV_DRBG *drbg, |
8bf36651 SL |
321 | unsigned char *out, size_t outlen, |
322 | const unsigned char *adin, size_t adin_len) | |
323 | { | |
f000e828 | 324 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; |
8bf36651 SL |
325 | unsigned char counter[4]; |
326 | int reseed_counter = drbg->reseed_gen_counter; | |
327 | ||
328 | counter[0] = (unsigned char)((reseed_counter >> 24) & 0xff); | |
329 | counter[1] = (unsigned char)((reseed_counter >> 16) & 0xff); | |
330 | counter[2] = (unsigned char)((reseed_counter >> 8) & 0xff); | |
331 | counter[3] = (unsigned char)(reseed_counter & 0xff); | |
332 | ||
f000e828 P |
333 | return hash->ctx != NULL |
334 | && (adin == NULL | |
8bf36651 | 335 | /* (Step 2) if adin != NULL then V = V + Hash(0x02||V||adin) */ |
f000e828 P |
336 | || adin_len == 0 |
337 | || add_hash_to_v(drbg, 0x02, adin, adin_len)) | |
8bf36651 SL |
338 | /* (Step 3) Hashgen(outlen, V) */ |
339 | && hash_gen(drbg, out, outlen) | |
340 | /* (Step 4/5) H = V = (V + Hash(0x03||V) mod (2^seedlen_bits) */ | |
341 | && add_hash_to_v(drbg, 0x03, NULL, 0) | |
342 | /* (Step 5) V = (V + H + C + reseed_counter) mod (2^seedlen_bits) */ | |
343 | /* V = (V + C) mod (2^seedlen_bits) */ | |
344 | && add_bytes(drbg, hash->V, hash->C, drbg->seedlen) | |
345 | /* V = (V + reseed_counter) mod (2^seedlen_bits) */ | |
346 | && add_bytes(drbg, hash->V, counter, 4); | |
347 | } | |
348 | ||
f000e828 P |
349 | static int drbg_hash_generate_wrapper |
350 | (void *vdrbg, unsigned char *out, size_t outlen, unsigned int strength, | |
351 | int prediction_resistance, const unsigned char *adin, size_t adin_len) | |
8bf36651 | 352 | { |
f000e828 P |
353 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; |
354 | ||
355 | return PROV_DRBG_generate(drbg, out, outlen, strength, | |
356 | prediction_resistance, adin, adin_len); | |
8bf36651 SL |
357 | } |
358 | ||
f000e828 P |
359 | static int drbg_hash_uninstantiate(PROV_DRBG *drbg) |
360 | { | |
361 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; | |
8bf36651 | 362 | |
f000e828 P |
363 | OPENSSL_cleanse(hash->V, sizeof(hash->V)); |
364 | OPENSSL_cleanse(hash->C, sizeof(hash->C)); | |
365 | OPENSSL_cleanse(hash->vtmp, sizeof(hash->vtmp)); | |
366 | return PROV_DRBG_uninstantiate(drbg); | |
367 | } | |
368 | ||
369 | static int drbg_hash_uninstantiate_wrapper(void *vdrbg) | |
8bf36651 | 370 | { |
f000e828 P |
371 | return drbg_hash_uninstantiate((PROV_DRBG *)vdrbg); |
372 | } | |
8bf36651 | 373 | |
f000e828 P |
374 | static int drbg_hash_verify_zeroization(void *vdrbg) |
375 | { | |
376 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
377 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; | |
8bf36651 | 378 | |
f000e828 P |
379 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->V); |
380 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->C); | |
381 | PROV_DRBG_VERYIFY_ZEROIZATION(hash->vtmp); | |
382 | return 1; | |
383 | } | |
384 | ||
385 | static int drbg_hash_new(PROV_DRBG *ctx) | |
386 | { | |
387 | PROV_DRBG_HASH *hash; | |
388 | ||
389 | hash = OPENSSL_secure_zalloc(sizeof(*hash)); | |
390 | if (hash == NULL) { | |
391 | ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); | |
5d0cf102 | 392 | return 0; |
f000e828 | 393 | } |
57ca171a | 394 | |
f000e828 P |
395 | ctx->data = hash; |
396 | ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; | |
397 | ctx->max_entropylen = DRBG_MAX_LENGTH; | |
398 | ctx->max_noncelen = DRBG_MAX_LENGTH; | |
399 | ctx->max_perslen = DRBG_MAX_LENGTH; | |
400 | ctx->max_adinlen = DRBG_MAX_LENGTH; | |
8bf36651 | 401 | |
f000e828 P |
402 | /* Maximum number of bits per request = 2^19 = 2^16 bytes */ |
403 | ctx->max_request = 1 << 16; | |
404 | return 1; | |
405 | } | |
406 | ||
407 | static void *drbg_hash_new_wrapper(void *provctx, void *parent, | |
408 | const OSSL_DISPATCH *parent_dispatch) | |
409 | { | |
410 | return prov_rand_drbg_new(provctx, parent, parent_dispatch, &drbg_hash_new, | |
411 | &drbg_hash_instantiate, &drbg_hash_uninstantiate, | |
412 | &drbg_hash_reseed, &drbg_hash_generate); | |
413 | } | |
414 | ||
415 | static void drbg_hash_free(void *vdrbg) | |
416 | { | |
417 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
418 | PROV_DRBG_HASH *hash; | |
419 | ||
420 | if (drbg != NULL && (hash = (PROV_DRBG_HASH *)drbg->data) != NULL) { | |
421 | EVP_MD_CTX_free(hash->ctx); | |
422 | ossl_prov_digest_reset(&hash->digest); | |
423 | OPENSSL_secure_clear_free(hash, sizeof(*hash)); | |
8bf36651 | 424 | } |
f000e828 P |
425 | prov_rand_drbg_free(drbg); |
426 | } | |
427 | ||
428 | static int drbg_hash_get_ctx_params(void *vdrbg, OSSL_PARAM params[]) | |
429 | { | |
430 | PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; | |
431 | ||
432 | return drbg_get_ctx_params(drbg, params); | |
433 | } | |
8bf36651 | 434 | |
f000e828 P |
435 | static const OSSL_PARAM *drbg_hash_gettable_ctx_params(void) |
436 | { | |
437 | static const OSSL_PARAM known_gettable_ctx_params[] = { | |
438 | OSSL_PARAM_DRBG_GETABLE_CTX_COMMON, | |
439 | OSSL_PARAM_END | |
440 | }; | |
441 | return known_gettable_ctx_params; | |
442 | } | |
57ca171a | 443 | |
f000e828 P |
444 | static int drbg_hash_set_ctx_params(void *vctx, const OSSL_PARAM params[]) |
445 | { | |
446 | PROV_DRBG *ctx = (PROV_DRBG *)vctx; | |
447 | PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)ctx->data; | |
448 | OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx); | |
449 | const EVP_MD *md; | |
8bf36651 | 450 | |
f000e828 P |
451 | if (!ossl_prov_digest_load_from_params(&hash->digest, params, libctx)) |
452 | return 0; | |
8bf36651 | 453 | |
f000e828 P |
454 | md = ossl_prov_digest_md(&hash->digest); |
455 | if (md != NULL) { | |
456 | if ((EVP_MD_flags(md) & EVP_MD_FLAG_XOF) != 0) { | |
457 | ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED); | |
458 | return 0; | |
459 | } | |
8bf36651 | 460 | |
f000e828 P |
461 | /* These are taken from SP 800-90 10.1 Table 2 */ |
462 | hash->blocklen = EVP_MD_size(md); | |
463 | /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */ | |
464 | ctx->strength = 64 * (hash->blocklen >> 3); | |
465 | if (ctx->strength > 256) | |
466 | ctx->strength = 256; | |
467 | if (hash->blocklen > MAX_BLOCKLEN_USING_SMALL_SEEDLEN) | |
468 | ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; | |
469 | else | |
470 | ctx->seedlen = HASH_PRNG_SMALL_SEEDLEN; | |
471 | ||
472 | ctx->min_entropylen = ctx->strength / 8; | |
473 | ctx->min_noncelen = ctx->min_entropylen / 2; | |
474 | } | |
8bf36651 | 475 | |
f000e828 P |
476 | return drbg_set_ctx_params(ctx, params); |
477 | } | |
8bf36651 | 478 | |
f000e828 P |
479 | static const OSSL_PARAM *drbg_hash_settable_ctx_params(void) |
480 | { | |
481 | static const OSSL_PARAM known_settable_ctx_params[] = { | |
482 | OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0), | |
483 | OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0), | |
484 | OSSL_PARAM_DRBG_SETABLE_CTX_COMMON, | |
485 | OSSL_PARAM_END | |
486 | }; | |
487 | return known_settable_ctx_params; | |
8bf36651 | 488 | } |
f000e828 P |
489 | |
490 | const OSSL_DISPATCH drbg_hash_functions[] = { | |
491 | { OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_hash_new_wrapper }, | |
492 | { OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_hash_free }, | |
493 | { OSSL_FUNC_RAND_INSTANTIATE, | |
494 | (void(*)(void))drbg_hash_instantiate_wrapper }, | |
495 | { OSSL_FUNC_RAND_UNINSTANTIATE, | |
496 | (void(*)(void))drbg_hash_uninstantiate_wrapper }, | |
497 | { OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_hash_generate_wrapper }, | |
498 | { OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_hash_reseed_wrapper }, | |
499 | { OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))drbg_enable_locking }, | |
500 | { OSSL_FUNC_RAND_LOCK, (void(*)(void))drbg_lock }, | |
501 | { OSSL_FUNC_RAND_UNLOCK, (void(*)(void))drbg_unlock }, | |
502 | { OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS, | |
503 | (void(*)(void))drbg_hash_settable_ctx_params }, | |
504 | { OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_hash_set_ctx_params }, | |
505 | { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS, | |
506 | (void(*)(void))drbg_hash_gettable_ctx_params }, | |
507 | { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_hash_get_ctx_params }, | |
508 | { OSSL_FUNC_RAND_SET_CALLBACKS, (void(*)(void))drbg_set_callbacks }, | |
509 | { OSSL_FUNC_RAND_VERIFY_ZEROIZATION, | |
510 | (void(*)(void))drbg_hash_verify_zeroization }, | |
511 | { 0, NULL } | |
512 | }; |