/********************************************************************** * gost_prov_digest.c - Initialize all digests * * * * Copyright (c) 2021 Richard Levitte * * This file is distributed under the same license as OpenSSL * * * * OpenSSL provider interface to GOST digest functions * * Requires OpenSSL 3.0 for compilation * **********************************************************************/ #include #include #include "gost_prov.h" #include "gost_lcl.h" /* * Forward declarations of all OSSL_DISPATCH functions, to make sure they * are correctly defined further down. */ static OSSL_FUNC_digest_dupctx_fn digest_dupctx; static OSSL_FUNC_digest_freectx_fn digest_freectx; static OSSL_FUNC_digest_init_fn digest_init; static OSSL_FUNC_digest_update_fn digest_update; static OSSL_FUNC_digest_final_fn digest_final; struct gost_prov_crypt_ctx_st { /* Provider context */ PROV_CTX *provctx; /* OSSL_PARAM descriptors */ const OSSL_PARAM *known_params; /* GOST_digest descriptor */ GOST_digest *descriptor; /* * Since existing functionality is designed for ENGINEs, the functions * in this file are accomodated and are simply wrappers that use a local * EVP_MD and EVP_MD_CTX. * Future development should take a more direct approach and have the * appropriate digest functions and digest data directly in this context. */ /* The EVP_MD created from |descriptor| */ EVP_MD *digest; /* The context for the EVP_MD functions */ EVP_MD_CTX *dctx; }; typedef struct gost_prov_crypt_ctx_st GOST_CTX; static void digest_freectx(void *vgctx) { GOST_CTX *gctx = vgctx; /* * We don't free gctx->digest here. * That will be done by the provider teardown, via * GOST_prov_deinit_digests() (defined at the bottom of this file). */ EVP_MD_CTX_free(gctx->dctx); OPENSSL_free(gctx); } static GOST_CTX *digest_newctx(void *provctx, GOST_digest *descriptor, const OSSL_PARAM *known_params) { GOST_CTX *gctx = NULL; if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) { gctx->provctx = provctx; gctx->known_params = known_params; gctx->descriptor = descriptor; gctx->digest = GOST_init_digest(descriptor); gctx->dctx = EVP_MD_CTX_new(); if (gctx->digest == NULL || gctx->dctx == NULL) { digest_freectx(gctx); gctx = NULL; } } return gctx; } static void *digest_dupctx(void *vsrc) { GOST_CTX *src = vsrc; GOST_CTX *dst = digest_newctx(src->provctx, src->descriptor, src->known_params); if (dst != NULL) EVP_MD_CTX_copy(dst->dctx, src->dctx); return dst; } static int digest_get_params(EVP_MD *d, OSSL_PARAM params[]) { OSSL_PARAM *p; if (((p = OSSL_PARAM_locate(params, "blocksize")) != NULL && !OSSL_PARAM_set_size_t(p, EVP_MD_block_size(d))) || ((p = OSSL_PARAM_locate(params, "size")) != NULL && !OSSL_PARAM_set_size_t(p, EVP_MD_size(d))) || ((p = OSSL_PARAM_locate(params, "xof")) != NULL && !OSSL_PARAM_set_size_t(p, EVP_MD_flags(d) & EVP_MD_FLAG_XOF))) return 0; return 1; } static int digest_init(void *vgctx, const OSSL_PARAM unused_params[]) { GOST_CTX *gctx = vgctx; return EVP_DigestInit_ex(gctx->dctx, gctx->digest, gctx->provctx->e) > 0; } static int digest_update(void *vgctx, const unsigned char *in, size_t inl) { GOST_CTX *gctx = vgctx; return EVP_DigestUpdate(gctx->dctx, in, (int)inl) > 0; } static int digest_final(void *vgctx, unsigned char *out, size_t *outl, size_t outsize) { GOST_CTX *gctx = vgctx; unsigned int int_outl = outl != NULL ? *outl : 0; int res = EVP_DigestFinal(gctx->dctx, out, &int_outl); if (res > 0 && outl != NULL) *outl = (size_t)int_outl; return res > 0; } static const OSSL_PARAM *known_GostR3411_94_digest_params; static const OSSL_PARAM *known_GostR3411_2012_256_digest_params; static const OSSL_PARAM *known_GostR3411_2012_512_digest_params; /* * These are named like the EVP_MD templates in gost_md.c etc, with the * added suffix "_functions". Hopefully, that makes it easy to find the * actual implementation. */ typedef void (*fptr_t)(void); #define MAKE_FUNCTIONS(name) \ static OSSL_FUNC_digest_get_params_fn name##_get_params; \ static int name##_get_params(OSSL_PARAM *params) \ { \ return digest_get_params(GOST_init_digest(&name), params); \ } \ static OSSL_FUNC_digest_newctx_fn name##_newctx; \ static void *name##_newctx(void *provctx) \ { \ return digest_newctx(provctx, &name, known_##name##_params); \ } \ static const OSSL_DISPATCH name##_functions[] = { \ { OSSL_FUNC_DIGEST_GET_PARAMS, (fptr_t)name##_get_params }, \ { OSSL_FUNC_DIGEST_NEWCTX, (fptr_t)name##_newctx }, \ { OSSL_FUNC_DIGEST_DUPCTX, (fptr_t)digest_dupctx }, \ { OSSL_FUNC_DIGEST_FREECTX, (fptr_t)digest_freectx }, \ { OSSL_FUNC_DIGEST_INIT, (fptr_t)digest_init }, \ { OSSL_FUNC_DIGEST_UPDATE, (fptr_t)digest_update }, \ { OSSL_FUNC_DIGEST_FINAL, (fptr_t)digest_final }, \ } MAKE_FUNCTIONS(GostR3411_94_digest); MAKE_FUNCTIONS(GostR3411_2012_256_digest); MAKE_FUNCTIONS(GostR3411_2012_512_digest); /* The OSSL_ALGORITHM for the provider's operation query function */ const OSSL_ALGORITHM GOST_prov_digests[] = { /* * Described in RFC 6986, first name from * https://www.ietf.org/archive/id/draft-deremin-rfc4491-bis-06.txt * (is there not an RFC namming these?) */ { "id-tc26-gost3411-12-256:md_gost12_256:1.2.643.7.1.1.2.2", NULL, GostR3411_2012_256_digest_functions, "GOST R 34.11-2012 with 256 bit hash" }, { "id-tc26-gost3411-12-512:md_gost12_512:1.2.643.7.1.1.2.3", NULL, GostR3411_2012_512_digest_functions, "GOST R 34.11-2012 with 512 bit hash" }, /* Described in RFC 5831, first name from RFC 4357, section 10.4 */ { "id-GostR3411-94:md_gost94:1.2.643.2.2.9", NULL, GostR3411_94_digest_functions, "GOST R 34.11-94" }, { NULL , NULL, NULL } }; void GOST_prov_deinit_digests(void) { static GOST_digest *list[] = { &GostR3411_94_digest, &GostR3411_2012_256_digest, &GostR3411_2012_512_digest, }; size_t i; #define elems(l) (sizeof(l) / sizeof(l[0])) for (i = 0; i < elems(list); i++) GOST_deinit_digest(list[i]); }