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/*
* 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 }
};
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