1 /*
2 * Copyright 2020-2022 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 "internal/deprecated.h"
11
12 #include <openssl/crypto.h>
13 #include <openssl/evp.h>
14 #include <openssl/core_dispatch.h>
15 #include <openssl/core_names.h>
16 #include <openssl/params.h>
17 #include <openssl/err.h>
18 #include <openssl/proverr.h>
19 #include "crypto/sm2.h"
20 #include "prov/provider_ctx.h"
21 #include "prov/implementations.h"
22 #include "prov/provider_util.h"
23
24 static OSSL_FUNC_asym_cipher_newctx_fn sm2_newctx;
25 static OSSL_FUNC_asym_cipher_encrypt_init_fn sm2_init;
26 static OSSL_FUNC_asym_cipher_encrypt_fn sm2_asym_encrypt;
27 static OSSL_FUNC_asym_cipher_decrypt_init_fn sm2_init;
28 static OSSL_FUNC_asym_cipher_decrypt_fn sm2_asym_decrypt;
29 static OSSL_FUNC_asym_cipher_freectx_fn sm2_freectx;
30 static OSSL_FUNC_asym_cipher_dupctx_fn sm2_dupctx;
31 static OSSL_FUNC_asym_cipher_get_ctx_params_fn sm2_get_ctx_params;
32 static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn sm2_gettable_ctx_params;
33 static OSSL_FUNC_asym_cipher_set_ctx_params_fn sm2_set_ctx_params;
34 static OSSL_FUNC_asym_cipher_settable_ctx_params_fn sm2_settable_ctx_params;
35
36 /*
37 * What's passed as an actual key is defined by the KEYMGMT interface.
38 * We happen to know that our KEYMGMT simply passes EC_KEY structures, so
39 * we use that here too.
40 */
41
42 typedef struct {
43 OSSL_LIB_CTX *libctx;
44 EC_KEY *key;
45 PROV_DIGEST md;
46 } PROV_SM2_CTX;
47
sm2_newctx(void * provctx)48 static void *sm2_newctx(void *provctx)
49 {
50 PROV_SM2_CTX *psm2ctx = OPENSSL_zalloc(sizeof(PROV_SM2_CTX));
51
52 if (psm2ctx == NULL)
53 return NULL;
54 psm2ctx->libctx = PROV_LIBCTX_OF(provctx);
55
56 return psm2ctx;
57 }
58
sm2_init(void * vpsm2ctx,void * vkey,const OSSL_PARAM params[])59 static int sm2_init(void *vpsm2ctx, void *vkey, const OSSL_PARAM params[])
60 {
61 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
62
63 if (psm2ctx == NULL || vkey == NULL || !EC_KEY_up_ref(vkey))
64 return 0;
65 EC_KEY_free(psm2ctx->key);
66 psm2ctx->key = vkey;
67
68 return sm2_set_ctx_params(psm2ctx, params);
69 }
70
sm2_get_md(PROV_SM2_CTX * psm2ctx)71 static const EVP_MD *sm2_get_md(PROV_SM2_CTX *psm2ctx)
72 {
73 const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md);
74
75 if (md == NULL)
76 md = ossl_prov_digest_fetch(&psm2ctx->md, psm2ctx->libctx, "SM3", NULL);
77
78 return md;
79 }
80
sm2_asym_encrypt(void * vpsm2ctx,unsigned char * out,size_t * outlen,size_t outsize,const unsigned char * in,size_t inlen)81 static int sm2_asym_encrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen,
82 size_t outsize, const unsigned char *in,
83 size_t inlen)
84 {
85 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
86 const EVP_MD *md = sm2_get_md(psm2ctx);
87
88 if (md == NULL)
89 return 0;
90
91 if (out == NULL) {
92 if (!ossl_sm2_ciphertext_size(psm2ctx->key, md, inlen, outlen)) {
93 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
94 return 0;
95 }
96 return 1;
97 }
98
99 return ossl_sm2_encrypt(psm2ctx->key, md, in, inlen, out, outlen);
100 }
101
sm2_asym_decrypt(void * vpsm2ctx,unsigned char * out,size_t * outlen,size_t outsize,const unsigned char * in,size_t inlen)102 static int sm2_asym_decrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen,
103 size_t outsize, const unsigned char *in,
104 size_t inlen)
105 {
106 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
107 const EVP_MD *md = sm2_get_md(psm2ctx);
108
109 if (md == NULL)
110 return 0;
111
112 if (out == NULL) {
113 if (!ossl_sm2_plaintext_size(in, inlen, outlen))
114 return 0;
115 return 1;
116 }
117
118 return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen);
119 }
120
sm2_freectx(void * vpsm2ctx)121 static void sm2_freectx(void *vpsm2ctx)
122 {
123 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
124
125 EC_KEY_free(psm2ctx->key);
126 ossl_prov_digest_reset(&psm2ctx->md);
127
128 OPENSSL_free(psm2ctx);
129 }
130
sm2_dupctx(void * vpsm2ctx)131 static void *sm2_dupctx(void *vpsm2ctx)
132 {
133 PROV_SM2_CTX *srcctx = (PROV_SM2_CTX *)vpsm2ctx;
134 PROV_SM2_CTX *dstctx;
135
136 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
137 if (dstctx == NULL)
138 return NULL;
139
140 *dstctx = *srcctx;
141 memset(&dstctx->md, 0, sizeof(dstctx->md));
142
143 if (dstctx->key != NULL && !EC_KEY_up_ref(dstctx->key)) {
144 OPENSSL_free(dstctx);
145 return NULL;
146 }
147
148 if (!ossl_prov_digest_copy(&dstctx->md, &srcctx->md)) {
149 sm2_freectx(dstctx);
150 return NULL;
151 }
152
153 return dstctx;
154 }
155
sm2_get_ctx_params(void * vpsm2ctx,OSSL_PARAM * params)156 static int sm2_get_ctx_params(void *vpsm2ctx, OSSL_PARAM *params)
157 {
158 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
159 OSSL_PARAM *p;
160
161 if (vpsm2ctx == NULL)
162 return 0;
163
164 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_DIGEST);
165 if (p != NULL) {
166 const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md);
167
168 if (!OSSL_PARAM_set_utf8_string(p, md == NULL ? ""
169 : EVP_MD_get0_name(md)))
170 return 0;
171 }
172
173 return 1;
174 }
175
176 static const OSSL_PARAM known_gettable_ctx_params[] = {
177 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
178 OSSL_PARAM_END
179 };
180
sm2_gettable_ctx_params(ossl_unused void * vpsm2ctx,ossl_unused void * provctx)181 static const OSSL_PARAM *sm2_gettable_ctx_params(ossl_unused void *vpsm2ctx,
182 ossl_unused void *provctx)
183 {
184 return known_gettable_ctx_params;
185 }
186
sm2_set_ctx_params(void * vpsm2ctx,const OSSL_PARAM params[])187 static int sm2_set_ctx_params(void *vpsm2ctx, const OSSL_PARAM params[])
188 {
189 PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
190
191 if (psm2ctx == NULL)
192 return 0;
193 if (params == NULL)
194 return 1;
195
196 if (!ossl_prov_digest_load_from_params(&psm2ctx->md, params,
197 psm2ctx->libctx))
198 return 0;
199
200 return 1;
201 }
202
203 static const OSSL_PARAM known_settable_ctx_params[] = {
204 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
205 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PROPERTIES, NULL, 0),
206 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_ENGINE, NULL, 0),
207 OSSL_PARAM_END
208 };
209
sm2_settable_ctx_params(ossl_unused void * vpsm2ctx,ossl_unused void * provctx)210 static const OSSL_PARAM *sm2_settable_ctx_params(ossl_unused void *vpsm2ctx,
211 ossl_unused void *provctx)
212 {
213 return known_settable_ctx_params;
214 }
215
216 const OSSL_DISPATCH ossl_sm2_asym_cipher_functions[] = {
217 { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))sm2_newctx },
218 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))sm2_init },
219 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))sm2_asym_encrypt },
220 { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))sm2_init },
221 { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))sm2_asym_decrypt },
222 { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))sm2_freectx },
223 { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))sm2_dupctx },
224 { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
225 (void (*)(void))sm2_get_ctx_params },
226 { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
227 (void (*)(void))sm2_gettable_ctx_params },
228 { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
229 (void (*)(void))sm2_set_ctx_params },
230 { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
231 (void (*)(void))sm2_settable_ctx_params },
232 { 0, NULL }
233 };
234