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0bc193dd05
We leave it up to the EVP_MAC implemenations what to do with an update where the data length is 0. In the TLS HMAC implemenation this is still signficant. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/12732)
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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* Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <string.h>
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#include <stdarg.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/core.h>
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#include <openssl/core_names.h>
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#include <openssl/types.h>
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#include "internal/nelem.h"
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#include "crypto/evp.h"
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#include "internal/provider.h"
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#include "evp_local.h"
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EVP_MAC_CTX *EVP_MAC_CTX_new(EVP_MAC *mac)
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{
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EVP_MAC_CTX *ctx = OPENSSL_zalloc(sizeof(EVP_MAC_CTX));
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if (ctx == NULL
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|| (ctx->data = mac->newctx(ossl_provider_ctx(mac->prov))) == NULL
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|| !EVP_MAC_up_ref(mac)) {
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EVPerr(EVP_F_EVP_MAC_CTX_NEW, ERR_R_MALLOC_FAILURE);
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if (ctx != NULL)
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mac->freectx(ctx->data);
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OPENSSL_free(ctx);
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ctx = NULL;
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} else {
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ctx->meth = mac;
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}
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return ctx;
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}
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void EVP_MAC_CTX_free(EVP_MAC_CTX *ctx)
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{
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if (ctx != NULL) {
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ctx->meth->freectx(ctx->data);
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ctx->data = NULL;
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/* refcnt-- */
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EVP_MAC_free(ctx->meth);
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}
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OPENSSL_free(ctx);
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}
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EVP_MAC_CTX *EVP_MAC_CTX_dup(const EVP_MAC_CTX *src)
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{
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EVP_MAC_CTX *dst;
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if (src->data == NULL)
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return NULL;
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dst = OPENSSL_malloc(sizeof(*dst));
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if (dst == NULL) {
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EVPerr(EVP_F_EVP_MAC_CTX_DUP, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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*dst = *src;
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if (!EVP_MAC_up_ref(dst->meth)) {
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EVPerr(EVP_F_EVP_MAC_CTX_DUP, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(dst);
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return NULL;
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}
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dst->data = src->meth->dupctx(src->data);
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if (dst->data == NULL) {
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EVP_MAC_CTX_free(dst);
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return NULL;
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}
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return dst;
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}
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EVP_MAC *EVP_MAC_CTX_mac(EVP_MAC_CTX *ctx)
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{
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return ctx->meth;
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}
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size_t EVP_MAC_size(EVP_MAC_CTX *ctx)
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{
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size_t sz = 0;
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if (ctx->data != NULL) {
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OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
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params[0] = OSSL_PARAM_construct_size_t(OSSL_MAC_PARAM_SIZE, &sz);
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if (ctx->meth->get_ctx_params != NULL) {
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if (ctx->meth->get_ctx_params(ctx->data, params))
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return sz;
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} else if (ctx->meth->get_params != NULL) {
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if (ctx->meth->get_params(params))
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return sz;
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}
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}
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/*
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* If the MAC hasn't been initialized yet, or there is no size to get,
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* we return zero
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*/
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return 0;
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}
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int EVP_MAC_init(EVP_MAC_CTX *ctx)
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{
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return ctx->meth->init(ctx->data);
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}
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int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen)
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{
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return ctx->meth->update(ctx->data, data, datalen);
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}
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int EVP_MAC_final(EVP_MAC_CTX *ctx,
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unsigned char *out, size_t *outl, size_t outsize)
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{
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size_t l;
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int res = 1;
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if (out != NULL)
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res = ctx->meth->final(ctx->data, out, &l, outsize);
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else
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l = EVP_MAC_size(ctx);
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if (outl != NULL)
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*outl = l;
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return res;
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}
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/*
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* The {get,set}_params functions return 1 if there is no corresponding
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* function in the implementation. This is the same as if there was one,
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* but it didn't recognise any of the given params, i.e. nothing in the
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* bag of parameters was useful.
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*/
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int EVP_MAC_get_params(EVP_MAC *mac, OSSL_PARAM params[])
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{
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if (mac->get_params != NULL)
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return mac->get_params(params);
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return 1;
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}
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int EVP_MAC_CTX_get_params(EVP_MAC_CTX *ctx, OSSL_PARAM params[])
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{
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if (ctx->meth->get_ctx_params != NULL)
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return ctx->meth->get_ctx_params(ctx->data, params);
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return 1;
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}
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int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[])
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{
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if (ctx->meth->set_ctx_params != NULL)
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return ctx->meth->set_ctx_params(ctx->data, params);
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return 1;
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}
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int EVP_MAC_number(const EVP_MAC *mac)
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{
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return mac->name_id;
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}
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int EVP_MAC_is_a(const EVP_MAC *mac, const char *name)
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{
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return evp_is_a(mac->prov, mac->name_id, NULL, name);
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}
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void EVP_MAC_names_do_all(const EVP_MAC *mac,
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void (*fn)(const char *name, void *data),
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void *data)
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{
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if (mac->prov != NULL)
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evp_names_do_all(mac->prov, mac->name_id, fn, data);
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}
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