/* * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include "internal/deprecated.h" #include <openssl/crypto.h> #include <openssl/evp.h> #include <openssl/core_dispatch.h> #include <openssl/core_names.h> #include <openssl/params.h> #include <openssl/err.h> #include <openssl/proverr.h> #include "crypto/sm2.h" #include "prov/provider_ctx.h" #include "prov/implementations.h" #include "prov/provider_util.h" static OSSL_FUNC_asym_cipher_newctx_fn sm2_newctx; static OSSL_FUNC_asym_cipher_encrypt_init_fn sm2_init; static OSSL_FUNC_asym_cipher_encrypt_fn sm2_asym_encrypt; static OSSL_FUNC_asym_cipher_decrypt_init_fn sm2_init; static OSSL_FUNC_asym_cipher_decrypt_fn sm2_asym_decrypt; static OSSL_FUNC_asym_cipher_freectx_fn sm2_freectx; static OSSL_FUNC_asym_cipher_dupctx_fn sm2_dupctx; static OSSL_FUNC_asym_cipher_get_ctx_params_fn sm2_get_ctx_params; static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn sm2_gettable_ctx_params; static OSSL_FUNC_asym_cipher_set_ctx_params_fn sm2_set_ctx_params; static OSSL_FUNC_asym_cipher_settable_ctx_params_fn sm2_settable_ctx_params; /* * What's passed as an actual key is defined by the KEYMGMT interface. * We happen to know that our KEYMGMT simply passes EC_KEY structures, so * we use that here too. */ typedef struct { OSSL_LIB_CTX *libctx; EC_KEY *key; PROV_DIGEST md; } PROV_SM2_CTX; static void *sm2_newctx(void *provctx) { PROV_SM2_CTX *psm2ctx = OPENSSL_zalloc(sizeof(PROV_SM2_CTX)); if (psm2ctx == NULL) return NULL; psm2ctx->libctx = PROV_LIBCTX_OF(provctx); return psm2ctx; } static int sm2_init(void *vpsm2ctx, void *vkey, const OSSL_PARAM params[]) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; if (psm2ctx == NULL || vkey == NULL || !EC_KEY_up_ref(vkey)) return 0; EC_KEY_free(psm2ctx->key); psm2ctx->key = vkey; return sm2_set_ctx_params(psm2ctx, params); } static const EVP_MD *sm2_get_md(PROV_SM2_CTX *psm2ctx) { const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md); if (md == NULL) md = ossl_prov_digest_fetch(&psm2ctx->md, psm2ctx->libctx, "SM3", NULL); return md; } static int sm2_asym_encrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen, size_t outsize, const unsigned char *in, size_t inlen) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; const EVP_MD *md = sm2_get_md(psm2ctx); if (md == NULL) return 0; if (out == NULL) { if (!ossl_sm2_ciphertext_size(psm2ctx->key, md, inlen, outlen)) { ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY); return 0; } return 1; } return ossl_sm2_encrypt(psm2ctx->key, md, in, inlen, out, outlen); } static int sm2_asym_decrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen, size_t outsize, const unsigned char *in, size_t inlen) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; const EVP_MD *md = sm2_get_md(psm2ctx); if (md == NULL) return 0; if (out == NULL) { if (!ossl_sm2_plaintext_size(in, inlen, outlen)) return 0; return 1; } return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen); } static void sm2_freectx(void *vpsm2ctx) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; EC_KEY_free(psm2ctx->key); ossl_prov_digest_reset(&psm2ctx->md); OPENSSL_free(psm2ctx); } static void *sm2_dupctx(void *vpsm2ctx) { PROV_SM2_CTX *srcctx = (PROV_SM2_CTX *)vpsm2ctx; PROV_SM2_CTX *dstctx; dstctx = OPENSSL_zalloc(sizeof(*srcctx)); if (dstctx == NULL) return NULL; *dstctx = *srcctx; memset(&dstctx->md, 0, sizeof(dstctx->md)); if (dstctx->key != NULL && !EC_KEY_up_ref(dstctx->key)) { OPENSSL_free(dstctx); return NULL; } if (!ossl_prov_digest_copy(&dstctx->md, &srcctx->md)) { sm2_freectx(dstctx); return NULL; } return dstctx; } static int sm2_get_ctx_params(void *vpsm2ctx, OSSL_PARAM *params) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; OSSL_PARAM *p; if (vpsm2ctx == NULL) return 0; p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_DIGEST); if (p != NULL) { const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md); if (!OSSL_PARAM_set_utf8_string(p, md == NULL ? "" : EVP_MD_get0_name(md))) return 0; } return 1; } static const OSSL_PARAM known_gettable_ctx_params[] = { OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0), OSSL_PARAM_END }; static const OSSL_PARAM *sm2_gettable_ctx_params(ossl_unused void *vpsm2ctx, ossl_unused void *provctx) { return known_gettable_ctx_params; } static int sm2_set_ctx_params(void *vpsm2ctx, const OSSL_PARAM params[]) { PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx; if (psm2ctx == NULL) return 0; if (params == NULL) return 1; if (!ossl_prov_digest_load_from_params(&psm2ctx->md, params, psm2ctx->libctx)) return 0; return 1; } static const OSSL_PARAM known_settable_ctx_params[] = { OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0), OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PROPERTIES, NULL, 0), OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_ENGINE, NULL, 0), OSSL_PARAM_END }; static const OSSL_PARAM *sm2_settable_ctx_params(ossl_unused void *vpsm2ctx, ossl_unused void *provctx) { return known_settable_ctx_params; } const OSSL_DISPATCH ossl_sm2_asym_cipher_functions[] = { { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))sm2_newctx }, { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))sm2_init }, { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))sm2_asym_encrypt }, { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))sm2_init }, { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))sm2_asym_decrypt }, { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))sm2_freectx }, { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))sm2_dupctx }, { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS, (void (*)(void))sm2_get_ctx_params }, { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS, (void (*)(void))sm2_gettable_ctx_params }, { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS, (void (*)(void))sm2_set_ctx_params }, { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS, (void (*)(void))sm2_settable_ctx_params }, { 0, NULL } };