providers/implementations/asymciphers/sm2_enc.c

   1 /*
   2  * Copyright 2020-2021 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
  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
  59 static int sm2_init(void *vpsm2ctx, void *vkey)
  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 1;
  69 }
  70
  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
  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
 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(psm2ctx->key, md, inlen, outlen))
 114             return 0;
 115         return 1;
 116     }
 117
 118     return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen);
 119 }
 120
 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
 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     if (dstctx->key != NULL && !EC_KEY_up_ref(dstctx->key)) {
 142         OPENSSL_free(dstctx);
 143         return NULL;
 144     }
 145
 146     if (!ossl_prov_digest_copy(&dstctx->md, &srcctx->md)) {
 147         sm2_freectx(dstctx);
 148         return NULL;
 149     }
 150
 151     return dstctx;
 152 }
 153
 154 static int sm2_get_ctx_params(void *vpsm2ctx, OSSL_PARAM *params)
 155 {
 156     PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
 157     OSSL_PARAM *p;
 158
 159     if (vpsm2ctx == NULL || params == NULL)
 160         return 0;
 161
 162     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_DIGEST);
 163     if (p != NULL) {
 164         const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md);
 165
 166         if (!OSSL_PARAM_set_utf8_string(p, md == NULL ? ""
 167                                                       : EVP_MD_name(md)))
 168             return 0;
 169     }
 170
 171     return 1;
 172 }
 173
 174 static const OSSL_PARAM known_gettable_ctx_params[] = {
 175     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
 176     OSSL_PARAM_END
 177 };
 178
 179 static const OSSL_PARAM *sm2_gettable_ctx_params(ossl_unused void *provctx)
 180 {
 181     return known_gettable_ctx_params;
 182 }
 183
 184 static int sm2_set_ctx_params(void *vpsm2ctx, const OSSL_PARAM params[])
 185 {
 186     PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
 187
 188     if (psm2ctx == NULL || params == NULL)
 189         return 0;
 190
 191     if (!ossl_prov_digest_load_from_params(&psm2ctx->md, params,
 192                                            psm2ctx->libctx))
 193         return 0;
 194
 195     return 1;
 196 }
 197
 198 static const OSSL_PARAM known_settable_ctx_params[] = {
 199     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
 200     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PROPERTIES, NULL, 0),
 201     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_ENGINE, NULL, 0),
 202     OSSL_PARAM_END
 203 };
 204
 205 static const OSSL_PARAM *sm2_settable_ctx_params(ossl_unused void *provctx)
 206 {
 207     return known_settable_ctx_params;
 208 }
 209
 210 const OSSL_DISPATCH ossl_sm2_asym_cipher_functions[] = {
 211     { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))sm2_newctx },
 212     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))sm2_init },
 213     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))sm2_asym_encrypt },
 214     { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))sm2_init },
 215     { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))sm2_asym_decrypt },
 216     { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))sm2_freectx },
 217     { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))sm2_dupctx },
 218     { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
 219       (void (*)(void))sm2_get_ctx_params },
 220     { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
 221       (void (*)(void))sm2_gettable_ctx_params },
 222     { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
 223       (void (*)(void))sm2_set_ctx_params },
 224     { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
 225       (void (*)(void))sm2_settable_ctx_params },
 226     { 0, NULL }
 227 };