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 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, 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 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(in, inlen, outlen)) 114 return 0; 115 return 1; 116 } 117 118 return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen); 119 } 120 121 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 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 } 155 156 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 }; 180 181 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 } 186 187 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 }; 209 210 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
Indexes created Sat Feb 28 05:31:39 UTC 2026