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f3090fc7 | 1 | /* |
2 | * Copyright 2022 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 | ||
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <openssl/crypto.h> | |
13 | #include <openssl/err.h> | |
14 | #include <openssl/kdf.h> | |
15 | #include <openssl/proverr.h> | |
16 | #include <openssl/core_names.h> | |
17 | #include "prov/providercommon.h" | |
18 | #include "prov/implementations.h" | |
19 | #include "prov/hmac_drbg.h" | |
20 | #include "prov/provider_ctx.h" | |
21 | ||
22 | static OSSL_FUNC_kdf_newctx_fn hmac_drbg_kdf_new; | |
23 | static OSSL_FUNC_kdf_dupctx_fn hmac_drbg_kdf_dup; | |
24 | static OSSL_FUNC_kdf_freectx_fn hmac_drbg_kdf_free; | |
25 | static OSSL_FUNC_kdf_reset_fn hmac_drbg_kdf_reset; | |
26 | static OSSL_FUNC_kdf_derive_fn hmac_drbg_kdf_derive; | |
27 | static OSSL_FUNC_kdf_settable_ctx_params_fn hmac_drbg_kdf_settable_ctx_params; | |
28 | static OSSL_FUNC_kdf_set_ctx_params_fn hmac_drbg_kdf_set_ctx_params; | |
29 | static OSSL_FUNC_kdf_gettable_ctx_params_fn hmac_drbg_kdf_gettable_ctx_params; | |
30 | static OSSL_FUNC_kdf_get_ctx_params_fn hmac_drbg_kdf_get_ctx_params; | |
31 | ||
32 | typedef struct { | |
33 | PROV_DRBG_HMAC base; | |
34 | void *provctx; | |
35 | unsigned char *entropy, *nonce; | |
36 | size_t entropylen, noncelen; | |
37 | int init; | |
38 | } KDF_HMAC_DRBG; | |
39 | ||
40 | static void *hmac_drbg_kdf_new(void *provctx) | |
41 | { | |
42 | KDF_HMAC_DRBG *ctx; | |
43 | ||
44 | if (!ossl_prov_is_running()) | |
45 | return NULL; | |
46 | ||
47 | ctx = OPENSSL_zalloc(sizeof(*ctx)); | |
48 | if (ctx == NULL) { | |
49 | ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); | |
50 | return NULL; | |
51 | } | |
52 | ctx->provctx = provctx; | |
53 | return ctx; | |
54 | } | |
55 | ||
56 | static void hmac_drbg_kdf_reset(void *vctx) | |
57 | { | |
58 | KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; | |
59 | PROV_DRBG_HMAC *drbg = &ctx->base; | |
60 | void *provctx = ctx->provctx; | |
61 | ||
62 | EVP_MAC_CTX_free(drbg->ctx); | |
63 | ossl_prov_digest_reset(&drbg->digest); | |
64 | OPENSSL_clear_free(ctx->entropy, ctx->entropylen); | |
65 | OPENSSL_clear_free(ctx->nonce, ctx->noncelen); | |
66 | OPENSSL_cleanse(ctx, sizeof(*ctx)); | |
67 | ctx->provctx = provctx; | |
68 | } | |
69 | ||
70 | static void hmac_drbg_kdf_free(void *vctx) | |
71 | { | |
72 | KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; | |
73 | ||
74 | if (ctx != NULL) { | |
75 | hmac_drbg_kdf_reset(ctx); | |
76 | OPENSSL_free(ctx); | |
77 | } | |
78 | } | |
79 | ||
80 | static int ossl_drbg_hmac_dup(PROV_DRBG_HMAC *dst, const PROV_DRBG_HMAC *src) { | |
81 | if (src->ctx != NULL) { | |
82 | dst->ctx = EVP_MAC_CTX_dup(src->ctx); | |
83 | if (dst->ctx == NULL) | |
84 | return 0; | |
85 | } | |
86 | if (!ossl_prov_digest_copy(&dst->digest, &src->digest)) | |
87 | return 0; | |
88 | memcpy(dst->K, src->K, sizeof(dst->K)); | |
89 | memcpy(dst->V, src->V, sizeof(dst->V)); | |
90 | dst->blocklen = src->blocklen; | |
91 | return 1; | |
92 | } | |
93 | ||
94 | static void *hmac_drbg_kdf_dup(void *vctx) | |
95 | { | |
96 | const KDF_HMAC_DRBG *src = (const KDF_HMAC_DRBG *)vctx; | |
97 | KDF_HMAC_DRBG *dst; | |
98 | ||
99 | dst = hmac_drbg_kdf_new(src->provctx); | |
100 | if (dst != NULL) { | |
101 | if (!ossl_drbg_hmac_dup(&dst->base, &src->base) | |
102 | || !ossl_prov_memdup(src->entropy, src->entropylen, | |
103 | &dst->entropy , &dst->entropylen) | |
104 | || !ossl_prov_memdup(src->nonce, src->noncelen, | |
105 | &dst->nonce, &dst->noncelen)) | |
106 | goto err; | |
107 | dst->init = src->init; | |
108 | } | |
109 | return dst; | |
110 | ||
111 | err: | |
112 | hmac_drbg_kdf_free(dst); | |
113 | return NULL; | |
114 | } | |
115 | ||
116 | static int hmac_drbg_kdf_derive(void *vctx, unsigned char *out, size_t outlen, | |
117 | const OSSL_PARAM params[]) | |
118 | { | |
119 | KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; | |
120 | PROV_DRBG_HMAC *drbg = &ctx->base; | |
121 | ||
122 | if (!ossl_prov_is_running() | |
123 | || !hmac_drbg_kdf_set_ctx_params(vctx, params)) | |
124 | return 0; | |
125 | if (!ctx->init) { | |
126 | if (ctx->entropy == NULL | |
127 | || ctx->entropylen == 0 | |
128 | || ctx->nonce == NULL | |
129 | || ctx->noncelen == 0 | |
130 | || !ossl_drbg_hmac_init(drbg, ctx->entropy, ctx->entropylen, | |
131 | ctx->nonce, ctx->noncelen, NULL, 0)) | |
132 | return 0; | |
133 | ctx->init = 1; | |
134 | } | |
135 | ||
136 | return ossl_drbg_hmac_generate(drbg, out, outlen, NULL, 0); | |
137 | } | |
138 | ||
139 | static int hmac_drbg_kdf_get_ctx_params(void *vctx, OSSL_PARAM params[]) | |
140 | { | |
141 | KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx; | |
142 | PROV_DRBG_HMAC *drbg = &hmac->base; | |
143 | const char *name; | |
144 | const EVP_MD *md; | |
145 | OSSL_PARAM *p; | |
146 | ||
147 | p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_MAC); | |
148 | if (p != NULL) { | |
149 | if (drbg->ctx == NULL) | |
150 | return 0; | |
151 | name = EVP_MAC_get0_name(EVP_MAC_CTX_get0_mac(drbg->ctx)); | |
152 | if (!OSSL_PARAM_set_utf8_string(p, name)) | |
153 | return 0; | |
154 | } | |
155 | ||
156 | p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_DIGEST); | |
157 | if (p != NULL) { | |
158 | md = ossl_prov_digest_md(&drbg->digest); | |
159 | if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_get0_name(md))) | |
160 | return 0; | |
161 | } | |
162 | return 1; | |
163 | } | |
164 | ||
165 | static const OSSL_PARAM *hmac_drbg_kdf_gettable_ctx_params( | |
166 | ossl_unused void *vctx, ossl_unused void *p_ctx) | |
167 | { | |
168 | static const OSSL_PARAM known_gettable_ctx_params[] = { | |
169 | OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MAC, NULL, 0), | |
170 | OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), | |
171 | OSSL_PARAM_END | |
172 | }; | |
173 | return known_gettable_ctx_params; | |
174 | } | |
175 | ||
176 | static int hmac_drbg_kdf_set_ctx_params(void *vctx, | |
177 | const OSSL_PARAM params[]) | |
178 | { | |
179 | KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx; | |
180 | PROV_DRBG_HMAC *drbg = &hmac->base; | |
181 | OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(hmac->provctx); | |
182 | const EVP_MD *md; | |
183 | const OSSL_PARAM *p; | |
184 | void *ptr = NULL; | |
185 | size_t size = 0; | |
186 | ||
187 | if (params == NULL) | |
188 | return 1; | |
189 | ||
190 | p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_ENTROPY); | |
191 | if (p != NULL) { | |
192 | if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size)) | |
193 | return 0; | |
194 | OPENSSL_free(hmac->entropy); | |
195 | hmac->entropy = ptr; | |
196 | hmac->entropylen = size; | |
197 | hmac->init = 0; | |
198 | ptr = NULL; | |
199 | } | |
200 | ||
201 | p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_NONCE); | |
202 | if (p != NULL) { | |
203 | if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size)) | |
204 | return 0; | |
205 | OPENSSL_free(hmac->nonce); | |
206 | hmac->nonce = ptr; | |
207 | hmac->noncelen = size; | |
208 | hmac->init = 0; | |
209 | } | |
210 | ||
211 | p = OSSL_PARAM_locate_const(params, OSSL_ALG_PARAM_DIGEST); | |
212 | if (p != NULL) { | |
213 | if (!ossl_prov_digest_load_from_params(&drbg->digest, params, libctx)) | |
214 | return 0; | |
215 | ||
216 | /* Confirm digest is allowed. Allow all digests that are not XOF */ | |
217 | md = ossl_prov_digest_md(&drbg->digest); | |
218 | if (md != NULL) { | |
219 | if ((EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF) != 0) { | |
220 | ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED); | |
221 | return 0; | |
222 | } | |
223 | drbg->blocklen = EVP_MD_get_size(md); | |
224 | } | |
225 | return ossl_prov_macctx_load_from_params(&drbg->ctx, params, | |
226 | "HMAC", NULL, NULL, libctx); | |
227 | } | |
228 | return 1; | |
229 | } | |
230 | ||
231 | static const OSSL_PARAM *hmac_drbg_kdf_settable_ctx_params( | |
232 | ossl_unused void *vctx, ossl_unused void *p_ctx) | |
233 | { | |
234 | static const OSSL_PARAM known_settable_ctx_params[] = { | |
235 | OSSL_PARAM_octet_string(OSSL_KDF_PARAM_HMACDRBG_ENTROPY, NULL, 0), | |
236 | OSSL_PARAM_octet_string(OSSL_KDF_PARAM_HMACDRBG_NONCE, NULL, 0), | |
237 | OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), | |
238 | OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0), | |
239 | OSSL_PARAM_END | |
240 | }; | |
241 | return known_settable_ctx_params; | |
242 | } | |
243 | ||
244 | const OSSL_DISPATCH ossl_kdf_hmac_drbg_functions[] = { | |
245 | { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))hmac_drbg_kdf_new }, | |
246 | { OSSL_FUNC_KDF_FREECTX, (void(*)(void))hmac_drbg_kdf_free }, | |
247 | { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))hmac_drbg_kdf_dup }, | |
248 | { OSSL_FUNC_KDF_RESET, (void(*)(void))hmac_drbg_kdf_reset }, | |
249 | { OSSL_FUNC_KDF_DERIVE, (void(*)(void))hmac_drbg_kdf_derive }, | |
250 | { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS, | |
251 | (void(*)(void))hmac_drbg_kdf_settable_ctx_params }, | |
252 | { OSSL_FUNC_KDF_SET_CTX_PARAMS, | |
253 | (void(*)(void))hmac_drbg_kdf_set_ctx_params }, | |
254 | { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS, | |
255 | (void(*)(void))hmac_drbg_kdf_gettable_ctx_params }, | |
256 | { OSSL_FUNC_KDF_GET_CTX_PARAMS, | |
257 | (void(*)(void))hmac_drbg_kdf_get_ctx_params }, | |
1e6bd31e | 258 | OSSL_DISPATCH_END |
f3090fc7 | 259 | }; |