From d0b79f8631c0f522c514175be4e4fbe984cf8f6c Mon Sep 17 00:00:00 2001 From: Paul Yang Date: Wed, 4 Mar 2020 23:49:43 +0800 Subject: Add SM2 signature algorithm to default provider Reviewed-by: Richard Levitte Reviewed-by: Matt Caswell (Merged from https://github.com/openssl/openssl/pull/12536) --- providers/common/der/SM2.asn1 | 11 + providers/common/der/build.info | 16 +- providers/common/der/der_sm2.h.in | 23 + providers/common/der/der_sm2_gen.c.in | 17 + providers/common/der/der_sm2_key.c | 23 + providers/common/der/der_sm2_sig.c | 39 ++ providers/defltprov.c | 4 + .../implementations/include/prov/implementations.h | 1 + providers/implementations/keymgmt/ec_kmgmt.c | 87 ++-- providers/implementations/signature/build.info | 6 + providers/implementations/signature/sm2sig.c | 568 +++++++++++++++++++++ 11 files changed, 742 insertions(+), 53 deletions(-) create mode 100644 providers/common/der/SM2.asn1 create mode 100644 providers/common/der/der_sm2.h.in create mode 100644 providers/common/der/der_sm2_gen.c.in create mode 100644 providers/common/der/der_sm2_key.c create mode 100644 providers/common/der/der_sm2_sig.c create mode 100644 providers/implementations/signature/sm2sig.c (limited to 'providers') diff --git a/providers/common/der/SM2.asn1 b/providers/common/der/SM2.asn1 new file mode 100644 index 0000000000..f90e11f04a --- /dev/null +++ b/providers/common/der/SM2.asn1 @@ -0,0 +1,11 @@ +oscca OBJECT IDENTIFIER ::= { iso(1) member-body(2) cn(156) 10197 } + +sm-scheme OBJECT IDENTIFIER ::= { oscca 1 } + +-- OID for SM2 signatures with SM3 + +sm2-with-SM3 OBJECT IDENTIFIER ::= { sm-scheme 501 } + +-- Named Elliptic Curves of SM2 + +curveSM2 OBJECT IDENTIFIER ::= { sm-scheme 301 } diff --git a/providers/common/der/build.info b/providers/common/der/build.info index 60c0d8e66c..ae5f1612ee 100644 --- a/providers/common/der/build.info +++ b/providers/common/der/build.info @@ -74,6 +74,19 @@ DEPEND[${DER_WRAP_GEN/.c/.o}]=$DER_WRAP_H GENERATE[$DER_WRAP_H]=der_wrap.h.in DEPEND[$DER_WRAP_H]=oids_to_c.pm +#----- SM2 +$DER_SM2_H=../include/prov/der_sm2.h +$DER_SM2_GEN=der_sm2_gen.c +$DER_SM2_AUX=der_sm2_key.c der_sm2_sig.c + +GENERATE[$DER_SM2_GEN]=der_sm2_gen.c.in +DEPEND[$DER_SM2_GEN]=oids_to_c.pm + +DEPEND[${DER_SM2_AUX/.c/.o}]=$DER_SM2_H $DER_EC_H +DEPEND[${DER_SM2_GEN/.c/.o}]=$DER_SM2_H +GENERATE[$DER_SM2_H]=der_sm2.h.in +DEPEND[$DER_SM2_H]=oids_to_c.pm + #----- Conclusion # TODO(3.0) $COMMON should go to libcommon.a, but this currently leads @@ -84,7 +97,8 @@ $COMMON=\ $DER_DSA_GEN $DER_DSA_AUX \ $DER_EC_GEN $DER_EC_AUX \ $DER_DIGESTS_GEN \ - $DER_WRAP_GEN + $DER_WRAP_GEN \ + $DER_SM2_GEN $DER_SM2_AUX IF[{- !$disabled{ec} -}] $COMMON = $COMMON $DER_ECX_GEN $DER_ECX_AUX diff --git a/providers/common/der/der_sm2.h.in b/providers/common/der/der_sm2.h.in new file mode 100644 index 0000000000..406ddf2b16 --- /dev/null +++ b/providers/common/der/der_sm2.h.in @@ -0,0 +1,23 @@ +/* + * 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 + */ + +#include "internal/der.h" + +/* Well known OIDs precompiled */ +{- + $OUT = oids_to_c::process_leaves('providers/common/der/SM2.asn1', + { dir => $config{sourcedir}, + filter => \&oids_to_c::filter_to_H }); +-} + +/* Subject Public Key Info */ +int DER_w_algorithmIdentifier_SM2(WPACKET *pkt, int cont, EC_KEY *ec); +/* Signature */ +int DER_w_algorithmIdentifier_SM2_with_MD(WPACKET *pkt, int cont, + EC_KEY *ec, int mdnid); diff --git a/providers/common/der/der_sm2_gen.c.in b/providers/common/der/der_sm2_gen.c.in new file mode 100644 index 0000000000..fc3c4461df --- /dev/null +++ b/providers/common/der/der_sm2_gen.c.in @@ -0,0 +1,17 @@ +/* + * 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 + */ + +#include "prov/der_sm2.h" + +/* Well known OIDs precompiled */ +{- + $OUT = oids_to_c::process_leaves('providers/common/der/SM2.asn1', + { dir => $config{sourcedir}, + filter => \&oids_to_c::filter_to_C }); +-} diff --git a/providers/common/der/der_sm2_key.c b/providers/common/der/der_sm2_key.c new file mode 100644 index 0000000000..daf2072c9e --- /dev/null +++ b/providers/common/der/der_sm2_key.c @@ -0,0 +1,23 @@ +/* + * 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 + */ + +#include +#include "internal/packet.h" +#include "prov/der_ec.h" +#include "prov/der_sm2.h" + +int DER_w_algorithmIdentifier_SM2(WPACKET *pkt, int cont, EC_KEY *ec) +{ + return DER_w_begin_sequence(pkt, cont) + /* No parameters (yet?) */ + /* It seems SM2 identifier is the same to id_ecPublidKey */ + && DER_w_precompiled(pkt, -1, der_oid_id_ecPublicKey, + sizeof(der_oid_id_ecPublicKey)) + && DER_w_end_sequence(pkt, cont); +} diff --git a/providers/common/der/der_sm2_sig.c b/providers/common/der/der_sm2_sig.c new file mode 100644 index 0000000000..a35755065e --- /dev/null +++ b/providers/common/der/der_sm2_sig.c @@ -0,0 +1,39 @@ +/* + * 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 + */ + +#include +#include "internal/packet.h" +#include "prov/der_sm2.h" + +/* Aliases so we can have a uniform MD_CASE */ +#define der_oid_id_sm2_with_sm3 der_oid_sm2_with_SM3 + +#define MD_CASE(name) \ + case NID_##name: \ + precompiled = der_oid_id_sm2_with_##name; \ + precompiled_sz = sizeof(der_oid_id_sm2_with_##name); \ + break; + +int DER_w_algorithmIdentifier_SM2_with_MD(WPACKET *pkt, int cont, + EC_KEY *ec, int mdnid) +{ + const unsigned char *precompiled = NULL; + size_t precompiled_sz = 0; + + switch (mdnid) { + MD_CASE(sm3); + default: + return 0; + } + + return DER_w_begin_sequence(pkt, cont) + /* No parameters (yet?) */ + && DER_w_precompiled(pkt, -1, precompiled, precompiled_sz) + && DER_w_end_sequence(pkt, cont); +} diff --git a/providers/defltprov.c b/providers/defltprov.c index fabb56bfec..8564ddd5ca 100644 --- a/providers/defltprov.c +++ b/providers/defltprov.c @@ -364,6 +364,9 @@ static const OSSL_ALGORITHM deflt_signature[] = { { "ED25519:Ed25519", "provider=default", ed25519_signature_functions }, { "ED448:Ed448", "provider=default", ed448_signature_functions }, { "ECDSA", "provider=default", ecdsa_signature_functions }, +# ifndef OPENSSL_NO_SM2 + { "SM2", "provider=default", sm2_signature_functions }, +# endif #endif { "HMAC", "provider=default", mac_legacy_hmac_signature_functions }, { "SIPHASH", "provider=default", mac_legacy_siphash_signature_functions }, @@ -413,6 +416,7 @@ static const OSSL_ALGORITHM deflt_keymgmt[] = { #endif #ifndef OPENSSL_NO_CMAC { "CMAC", "provider=default", cmac_legacy_keymgmt_functions }, +#endif #ifndef OPENSSL_NO_SM2 { "SM2", "provider=default", sm2_keymgmt_functions }, #endif diff --git a/providers/implementations/include/prov/implementations.h b/providers/implementations/include/prov/implementations.h index 748ccf46fb..b67b4c7361 100644 --- a/providers/implementations/include/prov/implementations.h +++ b/providers/implementations/include/prov/implementations.h @@ -303,6 +303,7 @@ extern const OSSL_DISPATCH mac_legacy_hmac_signature_functions[]; extern const OSSL_DISPATCH mac_legacy_siphash_signature_functions[]; extern const OSSL_DISPATCH mac_legacy_poly1305_signature_functions[]; extern const OSSL_DISPATCH mac_legacy_cmac_signature_functions[]; +extern const OSSL_DISPATCH sm2_signature_functions[]; /* Asym Cipher */ extern const OSSL_DISPATCH rsa_asym_cipher_functions[]; diff --git a/providers/implementations/keymgmt/ec_kmgmt.c b/providers/implementations/keymgmt/ec_kmgmt.c index 07cba1962e..b57151a084 100644 --- a/providers/implementations/keymgmt/ec_kmgmt.c +++ b/providers/implementations/keymgmt/ec_kmgmt.c @@ -337,7 +337,8 @@ static int ec_match(const void *keydata1, const void *keydata2, int selection) } static -int ec_import(void *keydata, int selection, const OSSL_PARAM params[]) +int common_import(void *keydata, int selection, const OSSL_PARAM params[], + int sm2_curve) { EC_KEY *ec = keydata; const EC_GROUP *ecg = NULL; @@ -368,6 +369,14 @@ int ec_import(void *keydata, int selection, const OSSL_PARAM params[]) if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) ok = ok && ec_group_fromdata(ec, params); + /* + * sm2_curve: import the keys or domparams only on SM2 Curve + * !sm2_curve: import the keys or domparams only not on SM2 Curve + */ + if ((ecg = EC_KEY_get0_group(ec)) == NULL + || (sm2_curve ^ (EC_GROUP_get_curve_name(ecg) == NID_sm2))) + return 0; + if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) { int include_private = selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0; @@ -380,58 +389,17 @@ int ec_import(void *keydata, int selection, const OSSL_PARAM params[]) return ok; } +static +int ec_import(void *keydata, int selection, const OSSL_PARAM params[]) +{ + return common_import(keydata, selection, params, 0); +} + #ifndef OPENSSL_NO_SM2 static int sm2_import(void *keydata, int selection, const OSSL_PARAM params[]) { - EC_KEY *ec = keydata; - const EC_GROUP *ecg = NULL; - int ok = 1; - - if (ec == NULL) - return 0; - - /* - * In this implementation, we can export/import only keydata in the - * following combinations: - * - domain parameters only - * - public key with associated domain parameters (+optional other params) - * - private key with associated public key and domain parameters - * (+optional other params) - * - * This means: - * - domain parameters must always be requested - * - private key must be requested alongside public key - * - other parameters must be requested only alongside a key - */ - if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0) - return 0; - if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0 - && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0) - return 0; - if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0 - && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0) - return 0; - - if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) - ok = ok && ec_key_domparams_fromdata(ec, params); - - /* import the keys or domparams only on SM2 Curve */ - if ((ecg = EC_KEY_get0_group(ec)) == NULL - || EC_GROUP_get_curve_name(ecg) != NID_sm2) { - return 0; - } - - if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) { - int include_private = - selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0; - - ok = ok && ec_key_fromdata(ec, params, include_private); - } - if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0) - ok = ok && ec_key_otherparams_fromdata(ec, params); - - return ok; + return common_import(keydata, selection, params, 1); } #endif @@ -857,7 +825,7 @@ static const OSSL_PARAM sm2_known_gettable_params[] = { }; static -const OSSL_PARAM *sm2_gettable_params(void) +const OSSL_PARAM *sm2_gettable_params(ossl_unused void *provctx) { return sm2_known_gettable_params; } @@ -868,7 +836,7 @@ static const OSSL_PARAM sm2_known_settable_params[] = { }; static -const OSSL_PARAM *sm2_settable_params(void) +const OSSL_PARAM *sm2_settable_params(ossl_unused void *provctx) { return sm2_known_settable_params; } @@ -1184,8 +1152,21 @@ static void *sm2_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg) || (ec = EC_KEY_new_with_libctx(gctx->libctx, NULL)) == NULL) return NULL; + if (gctx->gen_group == NULL) { + if (!ec_gen_set_group_from_params(gctx)) + goto err; + } else { + if (gctx->encoding) { + int flags = ec_encoding_name2id(gctx->encoding); + if (flags < 0) + goto err; + EC_GROUP_set_asn1_flag(gctx->gen_group, flags); + } + } + /* We must always assign a group, no matter what */ ret = ec_gen_assign_group(ec, gctx->gen_group); + /* Whether you want it or not, you get a keypair, not just one half */ if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) { /* @@ -1198,7 +1179,9 @@ static void *sm2_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg) if (ret) return ec; - +err: + /* Something went wrong, throw the key away */ + EC_KEY_free(ec); return NULL; } #endif diff --git a/providers/implementations/signature/build.info b/providers/implementations/signature/build.info index b06f6e5c79..84c5d905b2 100644 --- a/providers/implementations/signature/build.info +++ b/providers/implementations/signature/build.info @@ -3,6 +3,7 @@ $DSA_GOAL=../../libimplementations.a $EC_GOAL=../../libimplementations.a +$SM2SIG_GOAL=../../libimplementations.a IF[{- !$disabled{dsa} -}] SOURCE[$DSA_GOAL]=dsa.c @@ -12,6 +13,10 @@ IF[{- !$disabled{ec} -}] SOURCE[$EC_GOAL]=eddsa.c ecdsa.c ENDIF +IF[{- !$disabled{sm2} -}] + SOURCE[$SM2SIG_GOAL]=sm2sig.c +ENDIF + SOURCE[../../libfips.a]=rsa.c SOURCE[../../libnonfips.a]=rsa.c @@ -19,6 +24,7 @@ DEPEND[rsa.o]=../../common/include/prov/der_rsa.h DEPEND[dsa.o]=../../common/include/prov/der_dsa.h DEPEND[ecdsa.o]=../../common/include/prov/der_ec.h DEPEND[eddsa.o]=../../common/include/prov/der_ecx.h +DEPEND[sm2sig.o]=../../common/include/prov/der_sm2.h SOURCE[../../libfips.a]=mac_legacy.c SOURCE[../../libnonfips.a]=mac_legacy.c diff --git a/providers/implementations/signature/sm2sig.c b/providers/implementations/signature/sm2sig.c new file mode 100644 index 0000000000..0e35fb4739 --- /dev/null +++ b/providers/implementations/signature/sm2sig.c @@ -0,0 +1,568 @@ +/* + * 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 /* memcpy */ +#include +#include +#include +#include +#include +#include +#include +#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 } +}; -- cgit v1.2.3