A local copy of OpenSSL from GitHub
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/*
* Copyright 2020-2021 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
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use - SM2 implemetation uses ECDSA_size() function.
*/
#include "internal/deprecated.h"
#include <string.h> /* memcpy */
#include <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "internal/cryptlib.h"
#include "internal/sm3.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "crypto/ec.h"
#include "crypto/sm2.h"
#include "prov/der_sm2.h"
static OSSL_FUNC_signature_newctx_fn sm2sig_newctx;
static OSSL_FUNC_signature_sign_init_fn sm2sig_signature_init;
static OSSL_FUNC_signature_verify_init_fn sm2sig_signature_init;
static OSSL_FUNC_signature_sign_fn sm2sig_sign;
static OSSL_FUNC_signature_verify_fn sm2sig_verify;
static OSSL_FUNC_signature_digest_sign_init_fn sm2sig_digest_signverify_init;
static OSSL_FUNC_signature_digest_sign_update_fn sm2sig_digest_signverify_update;
static OSSL_FUNC_signature_digest_sign_final_fn sm2sig_digest_sign_final;
static OSSL_FUNC_signature_digest_verify_init_fn sm2sig_digest_signverify_init;
static OSSL_FUNC_signature_digest_verify_update_fn sm2sig_digest_signverify_update;
static OSSL_FUNC_signature_digest_verify_final_fn sm2sig_digest_verify_final;
static OSSL_FUNC_signature_freectx_fn sm2sig_freectx;
static OSSL_FUNC_signature_dupctx_fn sm2sig_dupctx;
static OSSL_FUNC_signature_get_ctx_params_fn sm2sig_get_ctx_params;
static OSSL_FUNC_signature_gettable_ctx_params_fn sm2sig_gettable_ctx_params;
static OSSL_FUNC_signature_set_ctx_params_fn sm2sig_set_ctx_params;
static OSSL_FUNC_signature_settable_ctx_params_fn sm2sig_settable_ctx_params;
static OSSL_FUNC_signature_get_ctx_md_params_fn sm2sig_get_ctx_md_params;
static OSSL_FUNC_signature_gettable_ctx_md_params_fn sm2sig_gettable_ctx_md_params;
static OSSL_FUNC_signature_set_ctx_md_params_fn sm2sig_set_ctx_md_params;
static OSSL_FUNC_signature_settable_ctx_md_params_fn sm2sig_settable_ctx_md_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes EC structures, so
* we use that here too.
*/
typedef struct {
OSSL_LIB_CTX *libctx;
char *propq;
EC_KEY *ec;
/*
* Flag to termine if the 'z' digest needs to be computed and fed to the
* hash function.
* This flag should be set on initialization and the compuation should
* be performed only once, on first update.
*/
unsigned int flag_compute_z_digest : 1;
char mdname[OSSL_MAX_NAME_SIZE];
/* The Algorithm Identifier of the combined signature algorithm */
unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
unsigned char *aid;
size_t aid_len;
/* main digest */
EVP_MD *md;
EVP_MD_CTX *mdctx;
size_t mdsize;
/* SM2 ID used for calculating the Z value */
unsigned char *id;
size_t id_len;
} PROV_SM2_CTX;
static int sm2sig_set_mdname(PROV_SM2_CTX *psm2ctx, const char *mdname)
{
if (psm2ctx->md == NULL) /* We need an SM3 md to compare with */
psm2ctx->md = EVP_MD_fetch(psm2ctx->libctx, psm2ctx->mdname,
psm2ctx->propq);
if (psm2ctx->md == NULL
|| strlen(mdname) >= sizeof(psm2ctx->mdname)
|| !EVP_MD_is_a(psm2ctx->md, mdname)) {
return 0;
}
OPENSSL_strlcpy(psm2ctx->mdname, mdname, sizeof(psm2ctx->mdname));
return 1;
}
static void *sm2sig_newctx(void *provctx, const char *propq)
{
PROV_SM2_CTX *ctx = OPENSSL_zalloc(sizeof(PROV_SM2_CTX));
if (ctx == NULL)
return NULL;
ctx->libctx = PROV_LIBCTX_OF(provctx);
if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
OPENSSL_free(ctx);
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
ctx->mdsize = SM3_DIGEST_LENGTH;
strcpy(ctx->mdname, OSSL_DIGEST_NAME_SM3);
return ctx;
}
static int sm2sig_signature_init(void *vpsm2ctx, void *ec,
const OSSL_PARAM params[])
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx == NULL || ec == NULL || !EC_KEY_up_ref(ec))
return 0;
EC_KEY_free(psm2ctx->ec);
psm2ctx->ec = ec;
return sm2sig_set_ctx_params(psm2ctx, params);
}
static int sm2sig_sign(void *vpsm2ctx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
int ret;
unsigned int sltmp;
/* SM2 uses ECDSA_size as well */
size_t ecsize = ECDSA_size(ctx->ec);
if (sig == NULL) {
*siglen = ecsize;
return 1;
}
if (sigsize < (size_t)ecsize)
return 0;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
ret = ossl_sm2_internal_sign(tbs, tbslen, sig, &sltmp, ctx->ec);
if (ret <= 0)
return 0;
*siglen = sltmp;
return 1;
}
static int sm2sig_verify(void *vpsm2ctx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
return ossl_sm2_internal_verify(tbs, tbslen, sig, siglen, ctx->ec);
}
static void free_md(PROV_SM2_CTX *ctx)
{
EVP_MD_CTX_free(ctx->mdctx);
EVP_MD_free(ctx->md);
ctx->mdctx = NULL;
ctx->md = NULL;
}
static int sm2sig_digest_signverify_init(void *vpsm2ctx, const char *mdname,
void *ec, const OSSL_PARAM params[])
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
int md_nid;
WPACKET pkt;
int ret = 0;
if (!sm2sig_signature_init(vpsm2ctx, ec, params)
|| !sm2sig_set_mdname(ctx, mdname))
return ret;
EVP_MD_CTX_free(ctx->mdctx);
ctx->mdctx = EVP_MD_CTX_new();
if (ctx->mdctx == NULL)
goto error;
md_nid = EVP_MD_type(ctx->md);
/*
* We do not care about DER writing errors.
* All it really means is that for some reason, there's no
* AlgorithmIdentifier to be had, but the operation itself is
* still valid, just as long as it's not used to construct
* anything that needs an AlgorithmIdentifier.
*/
ctx->aid_len = 0;
if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
&& ossl_DER_w_algorithmIdentifier_SM2_with_MD(&pkt, -1, ctx->ec, md_nid)
&& WPACKET_finish(&pkt)) {
WPACKET_get_total_written(&pkt, &ctx->aid_len);
ctx->aid = WPACKET_get_curr(&pkt);
}
WPACKET_cleanup(&pkt);
if (!EVP_DigestInit_ex2(ctx->mdctx, ctx->md, params))
goto error;
ctx->flag_compute_z_digest = 1;
ret = 1;
error:
if (!ret)
free_md(ctx);
return ret;
}
static int sm2sig_compute_z_digest(PROV_SM2_CTX *ctx)
{
uint8_t *z = NULL;
int ret = 1;
if (ctx->flag_compute_z_digest) {
/* Only do this once */
ctx->flag_compute_z_digest = 0;
if ((z = OPENSSL_zalloc(ctx->mdsize)) == NULL
/* get hashed prefix 'z' of tbs message */
|| !ossl_sm2_compute_z_digest(z, ctx->md, ctx->id, ctx->id_len,
ctx->ec)
|| !EVP_DigestUpdate(ctx->mdctx, z, ctx->mdsize))
ret = 0;
OPENSSL_free(z);
}
return ret;
}
int sm2sig_digest_signverify_update(void *vpsm2ctx, const unsigned char *data,
size_t datalen)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx == NULL || psm2ctx->mdctx == NULL)
return 0;
return sm2sig_compute_z_digest(psm2ctx)
&& EVP_DigestUpdate(psm2ctx->mdctx, data, datalen);
}
int sm2sig_digest_sign_final(void *vpsm2ctx, unsigned char *sig, size_t *siglen,
size_t sigsize)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int dlen = 0;
if (psm2ctx == NULL || psm2ctx->mdctx == NULL)
return 0;
/*
* If sig is NULL then we're just finding out the sig size. Other fields
* are ignored. Defer to sm2sig_sign.
*/
if (sig != NULL) {
if (!(sm2sig_compute_z_digest(psm2ctx)
&& EVP_DigestFinal_ex(psm2ctx->mdctx, digest, &dlen)))
return 0;
}
return sm2sig_sign(vpsm2ctx, sig, siglen, sigsize, digest, (size_t)dlen);
}
int sm2sig_digest_verify_final(void *vpsm2ctx, const unsigned char *sig,
size_t siglen)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int dlen = 0;
if (psm2ctx == NULL
|| psm2ctx->mdctx == NULL
|| EVP_MD_size(psm2ctx->md) > (int)sizeof(digest))
return 0;
if (!(sm2sig_compute_z_digest(psm2ctx)
&& EVP_DigestFinal_ex(psm2ctx->mdctx, digest, &dlen)))
return 0;
return sm2sig_verify(vpsm2ctx, sig, siglen, digest, (size_t)dlen);
}
static void sm2sig_freectx(void *vpsm2ctx)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
free_md(ctx);
EC_KEY_free(ctx->ec);
OPENSSL_free(ctx->id);
OPENSSL_free(ctx);
}
static void *sm2sig_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;
dstctx->ec = NULL;
dstctx->md = NULL;
dstctx->mdctx = NULL;
if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
goto err;
dstctx->ec = srcctx->ec;
if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
goto err;
dstctx->md = srcctx->md;
if (srcctx->mdctx != NULL) {
dstctx->mdctx = EVP_MD_CTX_new();
if (dstctx->mdctx == NULL
|| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
goto err;
}
if (srcctx->id != NULL) {
dstctx->id = OPENSSL_malloc(srcctx->id_len);
if (dstctx->id == NULL)
goto err;
dstctx->id_len = srcctx->id_len;
memcpy(dstctx->id, srcctx->id, srcctx->id_len);
}
return dstctx;
err:
sm2sig_freectx(dstctx);
return NULL;
}
static int sm2sig_get_ctx_params(void *vpsm2ctx, OSSL_PARAM *params)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
OSSL_PARAM *p;
if (psm2ctx == NULL)
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
if (p != NULL
&& !OSSL_PARAM_set_octet_string(p, psm2ctx->aid, psm2ctx->aid_len))
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p != NULL && !OSSL_PARAM_set_size_t(p, psm2ctx->mdsize))
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
if (p != NULL && !OSSL_PARAM_set_utf8_string(p, psm2ctx->md == NULL
? psm2ctx->mdname
: EVP_MD_name(psm2ctx->md)))
return 0;
return 1;
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *sm2sig_gettable_ctx_params(ossl_unused void *vpsm2ctx,
ossl_unused void *provctx)
{
return known_gettable_ctx_params;
}
static int sm2sig_set_ctx_params(void *vpsm2ctx, const OSSL_PARAM params[])
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
const OSSL_PARAM *p;
size_t mdsize;
if (psm2ctx == NULL)
return 0;
if (params == NULL)
return 1;
p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DIST_ID);
if (p != NULL) {
void *tmp_id = NULL;
size_t tmp_idlen;
/*
* If the 'z' digest has already been computed, the ID is set too late
*/
if (!psm2ctx->flag_compute_z_digest)
return 0;
if (!OSSL_PARAM_get_octet_string(p, &tmp_id, 0, &tmp_idlen))
return 0;
OPENSSL_free(psm2ctx->id);
psm2ctx->id = tmp_id;
psm2ctx->id_len = tmp_idlen;
}
/*
* The following code checks that the size is the same as the SM3 digest
* size returning an error otherwise.
* If there is ever any different digest algorithm allowed with SM2
* this needs to be adjusted accordingly.
*/
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p != NULL && (!OSSL_PARAM_get_size_t(p, &mdsize)
|| mdsize != psm2ctx->mdsize))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
if (p != NULL) {
char *mdname = NULL;
if (!OSSL_PARAM_get_utf8_string(p, &mdname, 0))
return 0;
if (!sm2sig_set_mdname(psm2ctx, mdname)) {
OPENSSL_free(mdname);
return 0;
}
OPENSSL_free(mdname);
}
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_DIST_ID, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *sm2sig_settable_ctx_params(ossl_unused void *vpsm2ctx,
ossl_unused void *provctx)
{
return known_settable_ctx_params;
}
static int sm2sig_get_ctx_md_params(void *vpsm2ctx, OSSL_PARAM *params)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx->mdctx == NULL)
return 0;
return EVP_MD_CTX_get_params(psm2ctx->mdctx, params);
}
static const OSSL_PARAM *sm2sig_gettable_ctx_md_params(void *vpsm2ctx)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx->md == NULL)
return 0;
return EVP_MD_gettable_ctx_params(psm2ctx->md);
}
static int sm2sig_set_ctx_md_params(void *vpsm2ctx, const OSSL_PARAM params[])
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx->mdctx == NULL)
return 0;
return EVP_MD_CTX_set_params(psm2ctx->mdctx, params);
}
static const OSSL_PARAM *sm2sig_settable_ctx_md_params(void *vpsm2ctx)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx->md == NULL)
return 0;
return EVP_MD_settable_ctx_params(psm2ctx->md);
}
const OSSL_DISPATCH ossl_sm2_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))sm2sig_newctx },
{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))sm2sig_signature_init },
{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))sm2sig_sign },
{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))sm2sig_signature_init },
{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))sm2sig_verify },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
(void (*)(void))sm2sig_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
(void (*)(void))sm2sig_digest_signverify_update },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
(void (*)(void))sm2sig_digest_sign_final },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
(void (*)(void))sm2sig_digest_signverify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
(void (*)(void))sm2sig_digest_signverify_update },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
(void (*)(void))sm2sig_digest_verify_final },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))sm2sig_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))sm2sig_dupctx },
{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))sm2sig_get_ctx_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
(void (*)(void))sm2sig_gettable_ctx_params },
{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))sm2sig_set_ctx_params },
{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
(void (*)(void))sm2sig_settable_ctx_params },
{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
(void (*)(void))sm2sig_get_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
(void (*)(void))sm2sig_gettable_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
(void (*)(void))sm2sig_set_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
(void (*)(void))sm2sig_settable_ctx_md_params },
{ 0, NULL }
};