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234 lines
6.8 KiB
C
234 lines
6.8 KiB
C
/*
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* Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/deprecated.h"
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#include <openssl/crypto.h>
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#include <openssl/evp.h>
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#include <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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#include <openssl/params.h>
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#include <openssl/err.h>
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#include <openssl/proverr.h>
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#include "crypto/sm2.h"
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#include "prov/provider_ctx.h"
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#include "prov/implementations.h"
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#include "prov/provider_util.h"
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static OSSL_FUNC_asym_cipher_newctx_fn sm2_newctx;
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static OSSL_FUNC_asym_cipher_encrypt_init_fn sm2_init;
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static OSSL_FUNC_asym_cipher_encrypt_fn sm2_asym_encrypt;
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static OSSL_FUNC_asym_cipher_decrypt_init_fn sm2_init;
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static OSSL_FUNC_asym_cipher_decrypt_fn sm2_asym_decrypt;
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static OSSL_FUNC_asym_cipher_freectx_fn sm2_freectx;
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static OSSL_FUNC_asym_cipher_dupctx_fn sm2_dupctx;
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static OSSL_FUNC_asym_cipher_get_ctx_params_fn sm2_get_ctx_params;
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static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn sm2_gettable_ctx_params;
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static OSSL_FUNC_asym_cipher_set_ctx_params_fn sm2_set_ctx_params;
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static OSSL_FUNC_asym_cipher_settable_ctx_params_fn sm2_settable_ctx_params;
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/*
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* What's passed as an actual key is defined by the KEYMGMT interface.
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* We happen to know that our KEYMGMT simply passes EC_KEY structures, so
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* we use that here too.
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*/
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typedef struct {
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OSSL_LIB_CTX *libctx;
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EC_KEY *key;
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PROV_DIGEST md;
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} PROV_SM2_CTX;
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static void *sm2_newctx(void *provctx)
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{
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PROV_SM2_CTX *psm2ctx = OPENSSL_zalloc(sizeof(PROV_SM2_CTX));
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if (psm2ctx == NULL)
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return NULL;
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psm2ctx->libctx = PROV_LIBCTX_OF(provctx);
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return psm2ctx;
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}
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static int sm2_init(void *vpsm2ctx, void *vkey, const OSSL_PARAM params[])
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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if (psm2ctx == NULL || vkey == NULL || !EC_KEY_up_ref(vkey))
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return 0;
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EC_KEY_free(psm2ctx->key);
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psm2ctx->key = vkey;
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return sm2_set_ctx_params(psm2ctx, params);
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}
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static const EVP_MD *sm2_get_md(PROV_SM2_CTX *psm2ctx)
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{
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const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md);
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if (md == NULL)
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md = ossl_prov_digest_fetch(&psm2ctx->md, psm2ctx->libctx, "SM3", NULL);
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return md;
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}
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static int sm2_asym_encrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in,
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size_t inlen)
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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const EVP_MD *md = sm2_get_md(psm2ctx);
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if (md == NULL)
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return 0;
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if (out == NULL) {
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if (!ossl_sm2_ciphertext_size(psm2ctx->key, md, inlen, outlen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
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return 0;
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}
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return 1;
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}
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return ossl_sm2_encrypt(psm2ctx->key, md, in, inlen, out, outlen);
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}
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static int sm2_asym_decrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in,
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size_t inlen)
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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const EVP_MD *md = sm2_get_md(psm2ctx);
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if (md == NULL)
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return 0;
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if (out == NULL) {
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if (!ossl_sm2_plaintext_size(in, inlen, outlen))
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return 0;
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return 1;
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}
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return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen);
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}
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static void sm2_freectx(void *vpsm2ctx)
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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EC_KEY_free(psm2ctx->key);
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ossl_prov_digest_reset(&psm2ctx->md);
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OPENSSL_free(psm2ctx);
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}
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static void *sm2_dupctx(void *vpsm2ctx)
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{
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PROV_SM2_CTX *srcctx = (PROV_SM2_CTX *)vpsm2ctx;
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PROV_SM2_CTX *dstctx;
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dstctx = OPENSSL_zalloc(sizeof(*srcctx));
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if (dstctx == NULL)
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return NULL;
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*dstctx = *srcctx;
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memset(&dstctx->md, 0, sizeof(dstctx->md));
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if (dstctx->key != NULL && !EC_KEY_up_ref(dstctx->key)) {
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OPENSSL_free(dstctx);
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return NULL;
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}
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if (!ossl_prov_digest_copy(&dstctx->md, &srcctx->md)) {
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sm2_freectx(dstctx);
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return NULL;
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}
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return dstctx;
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}
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static int sm2_get_ctx_params(void *vpsm2ctx, OSSL_PARAM *params)
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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OSSL_PARAM *p;
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if (vpsm2ctx == NULL)
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_DIGEST);
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if (p != NULL) {
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const EVP_MD *md = ossl_prov_digest_md(&psm2ctx->md);
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if (!OSSL_PARAM_set_utf8_string(p, md == NULL ? ""
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: EVP_MD_get0_name(md)))
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return 0;
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}
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return 1;
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}
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *sm2_gettable_ctx_params(ossl_unused void *vpsm2ctx,
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ossl_unused void *provctx)
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{
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return known_gettable_ctx_params;
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}
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static int sm2_set_ctx_params(void *vpsm2ctx, const OSSL_PARAM params[])
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{
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PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
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if (psm2ctx == NULL)
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return 0;
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if (params == NULL)
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return 1;
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if (!ossl_prov_digest_load_from_params(&psm2ctx->md, params,
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psm2ctx->libctx))
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return 0;
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return 1;
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}
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static const OSSL_PARAM known_settable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_DIGEST, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PROPERTIES, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_ENGINE, NULL, 0),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *sm2_settable_ctx_params(ossl_unused void *vpsm2ctx,
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ossl_unused void *provctx)
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{
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return known_settable_ctx_params;
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}
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const OSSL_DISPATCH ossl_sm2_asym_cipher_functions[] = {
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{ OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))sm2_newctx },
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{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))sm2_init },
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{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))sm2_asym_encrypt },
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{ OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))sm2_init },
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{ OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))sm2_asym_decrypt },
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{ OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))sm2_freectx },
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{ OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))sm2_dupctx },
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{ OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
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(void (*)(void))sm2_get_ctx_params },
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{ OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
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(void (*)(void))sm2_gettable_ctx_params },
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{ OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
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(void (*)(void))sm2_set_ctx_params },
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{ OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
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(void (*)(void))sm2_settable_ctx_params },
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OSSL_DISPATCH_END
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};
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