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openssl/crypto/evp/digest.c
Matt Caswell b2168cd81d Remove some legacy fields from the EVP_MD_CTX structure 
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29460)
2026-01-09 09:25:51 -05:00

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/*
* Copyright 1995-2025 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 <stdio.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/ec.h>
#include <openssl/params.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/nelem.h"
#include "internal/provider.h"
#include "internal/core.h"
#include "internal/common.h"
#include "crypto/evp.h"
#include "evp_local.h"
void evp_md_ctx_clear_digest(EVP_MD_CTX *ctx, int force, int keep_fetched)
{
if (ctx->algctx != NULL) {
if (ctx->digest != NULL && ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->algctx);
ctx->algctx = NULL;
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
}
/* Code below to be removed when legacy support is dropped. */
/*
* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
* sometimes only copies of the context are ever finalised.
*/
if (force)
ctx->digest = NULL;
/* Non legacy code, this has to be later than the ctx->digest cleaning */
if (!keep_fetched) {
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = NULL;
ctx->reqdigest = NULL;
}
}
static int evp_md_ctx_reset_ex(EVP_MD_CTX *ctx, int keep_fetched)
{
if (ctx == NULL)
return 1;
/*
* pctx should be freed by the user of EVP_MD_CTX
* if EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set
*/
if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) {
EVP_PKEY_CTX_free(ctx->pctx);
ctx->pctx = NULL;
}
evp_md_ctx_clear_digest(ctx, 0, keep_fetched);
if (!keep_fetched)
OPENSSL_cleanse(ctx, sizeof(*ctx));
return 1;
}
/* This call frees resources associated with the context */
int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
{
return evp_md_ctx_reset_ex(ctx, 0);
}
#ifndef FIPS_MODULE
EVP_MD_CTX *evp_md_ctx_new_ex(EVP_PKEY *pkey, const ASN1_OCTET_STRING *id,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_MD_CTX *ctx;
EVP_PKEY_CTX *pctx = NULL;
if ((ctx = EVP_MD_CTX_new()) == NULL
|| (pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq)) == NULL) {
ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
goto err;
}
if (id != NULL && EVP_PKEY_CTX_set1_id(pctx, id->data, id->length) <= 0)
goto err;
EVP_MD_CTX_set_pkey_ctx(ctx, pctx);
return ctx;
err:
EVP_PKEY_CTX_free(pctx);
EVP_MD_CTX_free(ctx);
return NULL;
}
#endif
EVP_MD_CTX *EVP_MD_CTX_new(void)
{
return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
}
void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
{
if (ctx == NULL)
return;
EVP_MD_CTX_reset(ctx);
OPENSSL_free(ctx);
}
int evp_md_ctx_free_algctx(EVP_MD_CTX *ctx)
{
if (ctx->algctx != NULL) {
if (!ossl_assert(ctx->digest != NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
if (ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->algctx);
ctx->algctx = NULL;
}
return 1;
}
static int evp_md_init_internal(EVP_MD_CTX *ctx, const EVP_MD *type,
const OSSL_PARAM params[])
{
#if !defined(FIPS_MODULE)
if (ctx->pctx != NULL
&& EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
&& ctx->pctx->op.sig.algctx != NULL) {
/*
* Prior to OpenSSL 3.0 calling EVP_DigestInit_ex() on an mdctx
* previously initialised with EVP_DigestSignInit() would retain
* information about the key, and re-initialise for another sign
* operation. So in that case we redirect to EVP_DigestSignInit()
*/
if (ctx->pctx->operation == EVP_PKEY_OP_SIGNCTX)
return EVP_DigestSignInit(ctx, NULL, type, NULL, NULL);
if (ctx->pctx->operation == EVP_PKEY_OP_VERIFYCTX)
return EVP_DigestVerifyInit(ctx, NULL, type, NULL, NULL);
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
#endif
EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED | EVP_MD_CTX_FLAG_FINALISED);
if (type != NULL) {
ctx->reqdigest = type;
} else {
if (ossl_unlikely(ctx->digest == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_DIGEST_SET);
return 0;
}
type = ctx->digest;
}
if (ossl_likely(ctx->digest == type)) {
if (ossl_unlikely(!ossl_assert(type->prov != NULL))) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
} else {
if (!evp_md_ctx_free_algctx(ctx))
return 0;
}
if (ossl_unlikely(type->prov == NULL)) {
#ifdef FIPS_MODULE
/* We only do explicit fetches inside the FIPS module */
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
#else
/* The NULL digest is a special case */
EVP_MD *provmd = EVP_MD_fetch(NULL,
type->type != NID_undef ? OBJ_nid2sn(type->type)
: "NULL",
"");
if (provmd == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
type = provmd;
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = provmd;
#endif
}
if (ossl_unlikely(type->prov != NULL && ctx->fetched_digest != type)) {
if (ossl_unlikely(!EVP_MD_up_ref((EVP_MD *)type))) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = (EVP_MD *)type;
}
ctx->digest = type;
if (ctx->algctx == NULL) {
ctx->algctx = ctx->digest->newctx(ossl_provider_ctx(type->prov));
if (ctx->algctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
if (ctx->digest->dinit == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
return ctx->digest->dinit(ctx->algctx, params);
}
int EVP_DigestInit_ex2(EVP_MD_CTX *ctx, const EVP_MD *type,
const OSSL_PARAM params[])
{
return evp_md_init_internal(ctx, type, params);
}
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
EVP_MD_CTX_reset(ctx);
return evp_md_init_internal(ctx, type, NULL);
}
int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
if (!ossl_assert(impl == NULL))
return 0;
return evp_md_init_internal(ctx, type, NULL);
}
int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
{
if (ossl_unlikely(count == 0))
return 1;
if (ossl_unlikely((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0)) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
if (ossl_unlikely(ctx->pctx != NULL)
&& EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
&& ctx->pctx->op.sig.algctx != NULL) {
#ifndef FIPS_MODULE
/*
* Prior to OpenSSL 3.0 EVP_DigestSignUpdate() and
* EVP_DigestVerifyUpdate() were just macros for EVP_DigestUpdate().
* Some code calls EVP_DigestUpdate() directly even when initialised
* with EVP_DigestSignInit_ex() or
* EVP_DigestVerifyInit_ex(), so we detect that and redirect to
* the correct EVP_Digest*Update() function
*/
if (ctx->pctx->operation == EVP_PKEY_OP_SIGNCTX)
return EVP_DigestSignUpdate(ctx, data, count);
if (ctx->pctx->operation == EVP_PKEY_OP_VERIFYCTX)
return EVP_DigestVerifyUpdate(ctx, data, count);
#endif
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
if (ctx->digest == NULL || ctx->digest->prov == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
if (ossl_unlikely(ctx->digest->dupdate == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
return ctx->digest->dupdate(ctx->algctx, data, count);
}
/* The caller can assume that this removes any secret data from the context */
int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
{
int ret;
ret = EVP_DigestFinal_ex(ctx, md, size);
EVP_MD_CTX_reset(ctx);
return ret;
}
/* The caller can assume that this removes any secret data from the context */
int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *isize)
{
int ret, sz;
size_t size = 0;
size_t mdsize = 0;
if (ossl_unlikely(ctx->digest == NULL))
return 0;
sz = EVP_MD_CTX_get_size(ctx);
if (ossl_unlikely(sz < 0))
return 0;
mdsize = sz;
if (ossl_unlikely(ctx->digest->prov == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
if (ossl_unlikely(ctx->digest->dfinal == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
if (ossl_unlikely((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
ret = ctx->digest->dfinal(ctx->algctx, md, &size, mdsize);
ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
if (isize != NULL) {
if (ossl_likely(size <= UINT_MAX)) {
*isize = (unsigned int)size;
} else {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
ret = 0;
}
}
return ret;
}
/* This is a one shot operation */
int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
{
int ret = 0;
OSSL_PARAM params[2];
size_t i = 0;
if (ossl_unlikely(ctx->digest == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ossl_unlikely(ctx->digest->prov == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
if (ossl_unlikely(ctx->digest->dfinal == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
if (ossl_unlikely((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0)) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
/*
* For backward compatibility we pass the XOFLEN via a param here so that
* older providers can use the supplied value. Ideally we should have just
* used the size passed into ctx->digest->dfinal().
*/
params[i++] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &size);
params[i++] = OSSL_PARAM_construct_end();
if (ossl_likely(EVP_MD_CTX_set_params(ctx, params) >= 0))
ret = ctx->digest->dfinal(ctx->algctx, md, &size, size);
ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
return ret;
}
/* EVP_DigestSqueeze() can be called multiple times */
int EVP_DigestSqueeze(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
{
if (ctx->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ctx->digest->prov == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (ctx->digest->dsqueeze == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
return 0;
}
return ctx->digest->dsqueeze(ctx->algctx, md, &size, size);
}
int EVP_MD_CTX_serialize(EVP_MD_CTX *ctx, unsigned char *out, size_t *outlen)
{
if (ctx->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ctx->digest->prov == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (ctx->digest->serialize == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
return 0;
}
if (ossl_unlikely((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0)) {
ERR_raise(ERR_LIB_EVP, EVP_R_CONTEXT_FINALIZED);
return 0;
}
return ctx->digest->serialize(ctx->algctx, out, outlen);
}
int EVP_MD_CTX_deserialize(EVP_MD_CTX *ctx, const unsigned char *in,
size_t inlen)
{
if (ctx->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ctx->digest->prov == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
return 0;
}
if (ctx->digest->deserialize == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
return 0;
}
if (ossl_unlikely((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0)) {
ERR_raise(ERR_LIB_EVP, EVP_R_CONTEXT_FINALIZED);
return 0;
}
return ctx->digest->deserialize(ctx->algctx, in, inlen);
}
EVP_MD_CTX *EVP_MD_CTX_dup(const EVP_MD_CTX *in)
{
EVP_MD_CTX *out = EVP_MD_CTX_new();
if (out != NULL && !EVP_MD_CTX_copy_ex(out, in)) {
EVP_MD_CTX_free(out);
out = NULL;
}
return out;
}
int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
EVP_MD_CTX_reset(out);
return EVP_MD_CTX_copy_ex(out, in);
}
int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
int digest_change = 0;
if (in == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (in->digest == NULL) {
/* copying uninitialized digest context */
EVP_MD_CTX_reset(out);
if (out->fetched_digest != NULL)
EVP_MD_free(out->fetched_digest);
*out = *in;
goto clone_pkey;
}
if (in->digest->prov == NULL || in->digest->dupctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
if (out->digest == in->digest && in->digest->copyctx != NULL) {
in->digest->copyctx(out->algctx, in->algctx);
EVP_PKEY_CTX_free(out->pctx);
out->pctx = NULL;
out->flags = in->flags;
} else {
evp_md_ctx_reset_ex(out, 1);
digest_change = (out->fetched_digest != in->fetched_digest);
if (digest_change && in->fetched_digest != NULL
&& !EVP_MD_up_ref(in->fetched_digest))
return 0;
if (digest_change && out->fetched_digest != NULL)
EVP_MD_free(out->fetched_digest);
*out = *in;
/* NULL out pointers in case of error */
out->pctx = NULL;
out->algctx = NULL;
if (in->algctx != NULL) {
out->algctx = in->digest->dupctx(in->algctx);
if (out->algctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
}
}
clone_pkey:
/* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
#ifndef FIPS_MODULE
if (in->pctx != NULL) {
out->pctx = EVP_PKEY_CTX_dup(in->pctx);
if (out->pctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
EVP_MD_CTX_reset(out);
return 0;
}
}
#endif
return 1;
}
int EVP_Digest(const void *data, size_t count,
unsigned char *md, unsigned int *size, const EVP_MD *type,
ENGINE *impl)
{
EVP_MD_CTX *ctx;
int ret;
if (!ossl_assert(impl == NULL))
return 0;
ctx = EVP_MD_CTX_new();
if (ctx == NULL)
return 0;
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
ret = EVP_DigestInit_ex(ctx, type, NULL)
&& EVP_DigestUpdate(ctx, data, count)
&& EVP_DigestFinal_ex(ctx, md, size);
EVP_MD_CTX_free(ctx);
return ret;
}
int EVP_Q_digest(OSSL_LIB_CTX *libctx, const char *name, const char *propq,
const void *data, size_t datalen,
unsigned char *md, size_t *mdlen)
{
EVP_MD *digest = EVP_MD_fetch(libctx, name, propq);
unsigned int temp = 0;
int ret = 0;
if (digest != NULL) {
ret = EVP_Digest(data, datalen, md, &temp, digest, NULL);
EVP_MD_free(digest);
}
if (mdlen != NULL)
*mdlen = temp;
return ret;
}
int EVP_MD_get_params(const EVP_MD *digest, OSSL_PARAM params[])
{
if (digest != NULL && digest->get_params != NULL)
return digest->get_params(params);
return 0;
}
const OSSL_PARAM *EVP_MD_gettable_params(const EVP_MD *digest)
{
if (digest != NULL && digest->gettable_params != NULL)
return digest->gettable_params(
ossl_provider_ctx(EVP_MD_get0_provider(digest)));
return NULL;
}
int EVP_MD_CTX_set_params(EVP_MD_CTX *ctx, const OSSL_PARAM params[])
{
EVP_PKEY_CTX *pctx = ctx->pctx;
/* If we have a pctx then we should try that first */
if (ossl_unlikely(pctx != NULL)
&& (pctx->operation == EVP_PKEY_OP_VERIFYCTX
|| pctx->operation == EVP_PKEY_OP_SIGNCTX)
&& pctx->op.sig.algctx != NULL
&& pctx->op.sig.signature->set_ctx_md_params != NULL)
return pctx->op.sig.signature->set_ctx_md_params(pctx->op.sig.algctx,
params);
if (ossl_likely(ctx->digest != NULL && ctx->digest->set_ctx_params != NULL))
return ctx->digest->set_ctx_params(ctx->algctx, params);
return 0;
}
const OSSL_PARAM *EVP_MD_settable_ctx_params(const EVP_MD *md)
{
void *provctx;
if (md != NULL && md->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_MD_get0_provider(md));
return md->settable_ctx_params(NULL, provctx);
}
return NULL;
}
const OSSL_PARAM *EVP_MD_CTX_settable_params(EVP_MD_CTX *ctx)
{
EVP_PKEY_CTX *pctx;
void *alg;
if (ctx == NULL)
return NULL;
/* If we have a pctx then we should try that first */
pctx = ctx->pctx;
if (pctx != NULL
&& (pctx->operation == EVP_PKEY_OP_VERIFYCTX
|| pctx->operation == EVP_PKEY_OP_SIGNCTX)
&& pctx->op.sig.algctx != NULL
&& pctx->op.sig.signature->settable_ctx_md_params != NULL)
return pctx->op.sig.signature->settable_ctx_md_params(
pctx->op.sig.algctx);
if (ctx->digest != NULL && ctx->digest->settable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_MD_get0_provider(ctx->digest));
return ctx->digest->settable_ctx_params(ctx->algctx, alg);
}
return NULL;
}
int EVP_MD_CTX_get_params(EVP_MD_CTX *ctx, OSSL_PARAM params[])
{
EVP_PKEY_CTX *pctx = ctx->pctx;
/* If we have a pctx then we should try that first */
if (pctx != NULL
&& (pctx->operation == EVP_PKEY_OP_VERIFYCTX
|| pctx->operation == EVP_PKEY_OP_SIGNCTX)
&& pctx->op.sig.algctx != NULL
&& pctx->op.sig.signature->get_ctx_md_params != NULL)
return pctx->op.sig.signature->get_ctx_md_params(pctx->op.sig.algctx,
params);
if (ctx->digest != NULL && ctx->digest->get_ctx_params != NULL)
return ctx->digest->get_ctx_params(ctx->algctx, params);
return 0;
}
const OSSL_PARAM *EVP_MD_gettable_ctx_params(const EVP_MD *md)
{
void *provctx;
if (md != NULL && md->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_MD_get0_provider(md));
return md->gettable_ctx_params(NULL, provctx);
}
return NULL;
}
const OSSL_PARAM *EVP_MD_CTX_gettable_params(EVP_MD_CTX *ctx)
{
EVP_PKEY_CTX *pctx;
void *provctx;
if (ossl_unlikely(ctx == NULL))
return NULL;
/* If we have a pctx then we should try that first */
pctx = ctx->pctx;
if (ossl_unlikely(pctx != NULL)
&& (pctx->operation == EVP_PKEY_OP_VERIFYCTX
|| pctx->operation == EVP_PKEY_OP_SIGNCTX)
&& pctx->op.sig.algctx != NULL
&& pctx->op.sig.signature->gettable_ctx_md_params != NULL)
return pctx->op.sig.signature->gettable_ctx_md_params(
pctx->op.sig.algctx);
if (ossl_unlikely(ctx->digest != NULL
&& ctx->digest->gettable_ctx_params != NULL)) {
provctx = ossl_provider_ctx(EVP_MD_get0_provider(ctx->digest));
return ctx->digest->gettable_ctx_params(ctx->algctx, provctx);
}
return NULL;
}
int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
{
int ret = EVP_CTRL_RET_UNSUPPORTED;
int set_params = 1;
size_t sz;
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (ctx->digest != NULL && ctx->digest->prov == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
switch (cmd) {
case EVP_MD_CTRL_XOF_LEN:
sz = (size_t)p1;
params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &sz);
break;
case EVP_MD_CTRL_MICALG:
set_params = 0;
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DIGEST_PARAM_MICALG,
p2, p1 ? p1 : 9999);
break;
case EVP_CTRL_SSL3_MASTER_SECRET:
params[0] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
p2, p1);
break;
default:
goto conclude;
}
if (set_params)
ret = EVP_MD_CTX_set_params(ctx, params);
else
ret = EVP_MD_CTX_get_params(ctx, params);
conclude:
if (ret <= 0)
return 0;
return ret;
}
EVP_MD *evp_md_new(void)
{
EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
if (md != NULL && !CRYPTO_NEW_REF(&md->refcnt, 1)) {
OPENSSL_free(md);
return NULL;
}
return md;
}
/*
* FIPS module note: since internal fetches will be entirely
* provider based, we know that none of its code depends on legacy
* NIDs or any functionality that use them.
*/
#ifndef FIPS_MODULE
static void set_legacy_nid(const char *name, void *vlegacy_nid)
{
int nid;
int *legacy_nid = vlegacy_nid;
/*
* We use lowest level function to get the associated method, because
* higher level functions such as EVP_get_digestbyname() have changed
* to look at providers too.
*/
const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
if (*legacy_nid == -1) /* We found a clash already */
return;
if (legacy_method == NULL)
return;
nid = EVP_MD_nid(legacy_method);
if (*legacy_nid != NID_undef && *legacy_nid != nid) {
*legacy_nid = -1;
return;
}
*legacy_nid = nid;
}
#endif
static int evp_md_cache_constants(EVP_MD *md)
{
int ok, xof = 0, algid_absent = 0;
size_t blksz = 0;
size_t mdsize = 0;
OSSL_PARAM params[5];
/*
* Note that these parameters are 'constants' that are only set up
* during the EVP_MD_fetch(). For this reason the XOF functions set the
* md_size to 0, since the output size is unknown.
*/
params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_BLOCK_SIZE, &blksz);
params[1] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_SIZE, &mdsize);
params[2] = OSSL_PARAM_construct_int(OSSL_DIGEST_PARAM_XOF, &xof);
params[3] = OSSL_PARAM_construct_int(OSSL_DIGEST_PARAM_ALGID_ABSENT,
&algid_absent);
params[4] = OSSL_PARAM_construct_end();
ok = evp_do_md_getparams(md, params) > 0;
if (mdsize > INT_MAX || blksz > INT_MAX)
ok = 0;
if (ok) {
md->block_size = (int)blksz;
md->md_size = (int)mdsize;
if (xof)
md->flags |= EVP_MD_FLAG_XOF;
if (algid_absent)
md->flags |= EVP_MD_FLAG_DIGALGID_ABSENT;
}
return ok;
}
static void *evp_md_from_algorithm(int name_id,
const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
const OSSL_DISPATCH *fns = algodef->implementation;
EVP_MD *md = NULL;
int fncnt = 0;
/* EVP_MD_fetch() will set the legacy NID if available */
if ((md = evp_md_new()) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
return NULL;
}
#ifndef FIPS_MODULE
md->type = NID_undef;
if (!evp_names_do_all(prov, name_id, set_legacy_nid, &md->type)
|| md->type == -1) {
ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
goto err;
}
#endif
md->name_id = name_id;
if ((md->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
goto err;
md->description = algodef->algorithm_description;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_DIGEST_NEWCTX:
if (md->newctx == NULL) {
md->newctx = OSSL_FUNC_digest_newctx(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_INIT:
if (md->dinit == NULL) {
md->dinit = OSSL_FUNC_digest_init(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_UPDATE:
if (md->dupdate == NULL) {
md->dupdate = OSSL_FUNC_digest_update(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_FINAL:
if (md->dfinal == NULL) {
md->dfinal = OSSL_FUNC_digest_final(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_SQUEEZE:
if (md->dsqueeze == NULL) {
md->dsqueeze = OSSL_FUNC_digest_squeeze(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_DIGEST:
if (md->digest == NULL)
md->digest = OSSL_FUNC_digest_digest(fns);
/* We don't increment fnct for this as it is stand alone */
break;
case OSSL_FUNC_DIGEST_FREECTX:
if (md->freectx == NULL) {
md->freectx = OSSL_FUNC_digest_freectx(fns);
fncnt++;
}
break;
case OSSL_FUNC_DIGEST_DUPCTX:
if (md->dupctx == NULL)
md->dupctx = OSSL_FUNC_digest_dupctx(fns);
break;
case OSSL_FUNC_DIGEST_GET_PARAMS:
if (md->get_params == NULL)
md->get_params = OSSL_FUNC_digest_get_params(fns);
break;
case OSSL_FUNC_DIGEST_SET_CTX_PARAMS:
if (md->set_ctx_params == NULL)
md->set_ctx_params = OSSL_FUNC_digest_set_ctx_params(fns);
break;
case OSSL_FUNC_DIGEST_GET_CTX_PARAMS:
if (md->get_ctx_params == NULL)
md->get_ctx_params = OSSL_FUNC_digest_get_ctx_params(fns);
break;
case OSSL_FUNC_DIGEST_GETTABLE_PARAMS:
if (md->gettable_params == NULL)
md->gettable_params = OSSL_FUNC_digest_gettable_params(fns);
break;
case OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS:
if (md->settable_ctx_params == NULL)
md->settable_ctx_params = OSSL_FUNC_digest_settable_ctx_params(fns);
break;
case OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS:
if (md->gettable_ctx_params == NULL)
md->gettable_ctx_params = OSSL_FUNC_digest_gettable_ctx_params(fns);
break;
case OSSL_FUNC_DIGEST_COPYCTX:
if (md->copyctx == NULL)
md->copyctx = OSSL_FUNC_digest_copyctx(fns);
break;
case OSSL_FUNC_DIGEST_SERIALIZE:
if (md->serialize == NULL)
md->serialize = OSSL_FUNC_digest_serialize(fns);
break;
case OSSL_FUNC_DIGEST_DESERIALIZE:
if (md->deserialize == NULL)
md->deserialize = OSSL_FUNC_digest_deserialize(fns);
break;
}
}
if ((fncnt != 0 && fncnt != 5 && fncnt != 6)
|| (fncnt == 0 && md->digest == NULL)) {
/*
* In order to be a consistent set of functions we either need the
* whole set of init/update/final etc functions or none of them.
* The "digest" function can standalone. We at least need one way to
* generate digests.
*/
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
goto err;
}
if (prov != NULL && !ossl_provider_up_ref(prov))
goto err;
md->prov = prov;
if (!evp_md_cache_constants(md)) {
ERR_raise(ERR_LIB_EVP, EVP_R_CACHE_CONSTANTS_FAILED);
goto err;
}
return md;
err:
EVP_MD_free(md);
return NULL;
}
static int evp_md_up_ref(void *md)
{
return EVP_MD_up_ref(md);
}
static void evp_md_free(void *md)
{
EVP_MD_free(md);
}
EVP_MD *EVP_MD_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
const char *properties)
{
EVP_MD *md = evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
evp_md_from_algorithm, evp_md_up_ref, evp_md_free);
return md;
}
int EVP_MD_up_ref(EVP_MD *md)
{
int ref = 0;
if (md->origin == EVP_ORIG_DYNAMIC)
CRYPTO_UP_REF(&md->refcnt, &ref);
return 1;
}
void EVP_MD_free(EVP_MD *md)
{
int i;
if (md == NULL || md->origin != EVP_ORIG_DYNAMIC)
return;
CRYPTO_DOWN_REF(&md->refcnt, &i);
if (i > 0)
return;
OPENSSL_free(md->type_name);
ossl_provider_free(md->prov);
CRYPTO_FREE_REF(&md->refcnt);
OPENSSL_free(md);
}
void EVP_MD_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_MD *mac, void *arg),
void *arg)
{
evp_generic_do_all(libctx, OSSL_OP_DIGEST,
(void (*)(void *, void *))fn, arg,
evp_md_from_algorithm, evp_md_up_ref, evp_md_free);
}
EVP_MD *evp_digest_fetch_from_prov(OSSL_PROVIDER *prov,
const char *algorithm,
const char *properties)
{
return evp_generic_fetch_from_prov(prov, OSSL_OP_DIGEST,
algorithm, properties,
evp_md_from_algorithm,
evp_md_up_ref,
evp_md_free);
}
typedef struct {
int md_nid;
int hmac_nid;
} ossl_hmacmd_pair;
static const ossl_hmacmd_pair ossl_hmacmd_pairs[] = {
{ NID_sha1, NID_hmacWithSHA1 },
{ NID_md5, NID_hmacWithMD5 },
{ NID_sha224, NID_hmacWithSHA224 },
{ NID_sha256, NID_hmacWithSHA256 },
{ NID_sha384, NID_hmacWithSHA384 },
{ NID_sha512, NID_hmacWithSHA512 },
{ NID_id_GostR3411_94, NID_id_HMACGostR3411_94 },
{ NID_id_GostR3411_2012_256, NID_id_tc26_hmac_gost_3411_2012_256 },
{ NID_id_GostR3411_2012_512, NID_id_tc26_hmac_gost_3411_2012_512 },
{ NID_sha3_224, NID_hmac_sha3_224 },
{ NID_sha3_256, NID_hmac_sha3_256 },
{ NID_sha3_384, NID_hmac_sha3_384 },
{ NID_sha3_512, NID_hmac_sha3_512 },
{ NID_sha512_224, NID_hmacWithSHA512_224 },
{ NID_sha512_256, NID_hmacWithSHA512_256 }
};
int ossl_hmac2mdnid(int hmac_nid)
{
int md_nid = NID_undef;
size_t i;
for (i = 0; i < OSSL_NELEM(ossl_hmacmd_pairs); i++) {
if (ossl_hmacmd_pairs[i].hmac_nid == hmac_nid) {
md_nid = ossl_hmacmd_pairs[i].md_nid;
break;
}
}
return md_nid;
}
int ossl_md2hmacnid(int md_nid)
{
int hmac_nid = NID_undef;
size_t i;
for (i = 0; i < OSSL_NELEM(ossl_hmacmd_pairs); i++) {
if (ossl_hmacmd_pairs[i].md_nid == md_nid) {
hmac_nid = ossl_hmacmd_pairs[i].hmac_nid;
break;
}
}
return hmac_nid;
}
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