+++ /dev/null
-/*
- * Copyright 2020 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 "internal/nelem.h"
-#include "internal/sizes.h"
-#include "internal/cryptlib.h"
-#include "prov/providercommonerr.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 {
- OPENSSL_CTX *libctx;
- char *propq;
- EC_KEY *ec;
-
- /*
- * Flag to determine if the hash function can be changed (1) or not (0)
- * Because it's dangerous to change during a DigestSign or DigestVerify
- * operation, this flag is cleared by their Init function, and set again
- * by their Final function.
- */
- unsigned int flag_allow_md : 1;
- /*
- * 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;
-
-/* TODO: it seems SM2 doesn't need this */
-static int sm2sig_get_md_nid(const EVP_MD *md)
-{
- /*
- * Because the EC library deals with NIDs, we need to translate.
- * We do so using EVP_MD_is_a(), and therefore need a name to NID
- * map.
- */
- static const OSSL_ITEM name_to_nid[] = {
- { NID_sm3, OSSL_DIGEST_NAME_SM3 },
- };
- size_t i;
- int mdnid = NID_undef;
-
- if (md == NULL)
- goto end;
-
- for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
- if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
- mdnid = (int)name_to_nid[i].id;
- break;
- }
- }
-
- if (mdnid == NID_undef)
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
-
- end:
- return mdnid;
-}
-
-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_LIBRARY_CONTEXT_OF(provctx);
- if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
- OPENSSL_free(ctx);
- ctx = NULL;
- ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
- }
- /* don't allow to change MD, and in fact there is no such need */
- ctx->flag_allow_md = 0;
- return ctx;
-}
-
-static int sm2sig_signature_init(void *vpsm2ctx, void *ec)
-{
- 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 1;
-}
-
-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 = 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 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;
- ctx->mdsize = 0;
-}
-
-static int sm2sig_digest_signverify_init(void *vpsm2ctx, const char *mdname,
- void *ec)
-{
- PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
- int md_nid = NID_undef;
- WPACKET pkt;
- int ret = 0;
-
- free_md(ctx);
-
- if (!sm2sig_signature_init(vpsm2ctx, ec))
- return ret;
-
- ctx->md = EVP_MD_fetch(ctx->libctx, mdname, ctx->propq);
- if ((md_nid = sm2sig_get_md_nid(ctx->md)) == NID_undef)
- goto error;
-
- ctx->mdsize = EVP_MD_size(ctx->md);
- ctx->mdctx = EVP_MD_CTX_new();
- if (ctx->mdctx == NULL)
- goto error;
-
- /*
- * TODO(3.0) Should we 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))
- && 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_ex(ctx->mdctx, ctx->md, NULL))
- 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 */
- || !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)
- return 0;
-
- /* SM2 always use SM3 so it's not possible to exceed the limit */
- 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 || params == 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 *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;
- char *mdname;
-
- if (psm2ctx == NULL || params == NULL)
- return 0;
-
- 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;
- }
-
- if (psm2ctx->md != NULL) {
- /*
- * You cannot set the digest name/size when doing a DigestSign or
- * DigestVerify.
- */
- return 1;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &psm2ctx->mdsize))
- return 0;
-
- /*
- * We never actually use the mdname, but we do support getting it later.
- * This can be useful for applications that want to know the MD that they
- * previously set.
- */
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
- mdname = psm2ctx->mdname;
- if (p != NULL
- && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(psm2ctx->mdname)))
- return 0;
-
- 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 *provctx)
-{
- /*
- * TODO(3.0): Should this function return a different set of settable ctx
- * params if the ctx is being used for a DigestSign/DigestVerify? In that
- * case it is not allowed to set the digest size/digest name because the
- * digest is explicitly set as part of the init.
- */
- 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 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 }
-};
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