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openssl/crypto/evp/digest.c
Richard Levitte 309a78aa30 CORE: Add an algorithm_description field to OSSL_ALGORITHM 
This corresponds to the |info| field in EVP_PKEY_ASN1_METHOD, as well
as the generic use of OBJ_nid2ln() as a one line description.

We also add the base functionality to make use of this field.

Fixes #14514

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14656)
2021-04-02 08:52:37 +02:00

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/*
* Copyright 1995-2021 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
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/params.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "crypto/evp.h"
#include "internal/provider.h"
#include "evp_local.h"
void evp_md_ctx_clear_digest(EVP_MD_CTX *ctx, int force)
{
if (ctx->provctx != NULL) {
if (ctx->digest != NULL && ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->provctx);
ctx->provctx = 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 (ctx->digest && ctx->digest->cleanup
&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
ctx->digest->cleanup(ctx);
if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
&& (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE) || force))
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
if (force)
ctx->digest = NULL;
#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
ENGINE_finish(ctx->engine);
ctx->engine = NULL;
#endif
/* Non legacy code, this has to be later than the ctx->digest cleaning */
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = NULL;
ctx->reqdigest = NULL;
}
/* This call frees resources associated with the context */
int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
{
if (ctx == NULL)
return 1;
#ifndef FIPS_MODULE
/*
* 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;
}
#endif
evp_md_ctx_clear_digest(ctx, 0);
OPENSSL_cleanse(ctx, sizeof(*ctx));
return 1;
}
#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_MALLOC_FAILURE);
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);
return;
}
static int evp_md_init_internal(EVP_MD_CTX *ctx, const EVP_MD *type,
const OSSL_PARAM params[], ENGINE *impl)
{
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
ENGINE *tmpimpl = NULL;
#endif
#if !defined(FIPS_MODULE)
if (ctx->pctx != NULL
&& EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
&& ctx->pctx->op.sig.sigprovctx != 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, impl, NULL);
if (ctx->pctx->operation == EVP_PKEY_OP_VERIFYCTX)
return EVP_DigestVerifyInit(ctx, NULL, type, impl, NULL);
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
#endif
EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
if (ctx->provctx != 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->provctx);
ctx->provctx = NULL;
}
if (type != NULL) {
ctx->reqdigest = type;
} else {
if (ctx->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_DIGEST_SET);
return 0;
}
type = ctx->digest;
}
/* Code below to be removed when legacy support is dropped. */
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
/*
* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
* this context may already have an ENGINE! Try to avoid releasing the
* previous handle, re-querying for an ENGINE, and having a
* reinitialisation, when it may all be unnecessary.
*/
if (ctx->engine && ctx->digest &&
(type == NULL || (type->type == ctx->digest->type)))
goto skip_to_init;
if (type != NULL) {
/*
* Ensure an ENGINE left lying around from last time is cleared (the
* previous check attempted to avoid this if the same ENGINE and
* EVP_MD could be used).
*/
ENGINE_finish(ctx->engine);
ctx->engine = NULL;
}
if (type != NULL && impl == NULL)
tmpimpl = ENGINE_get_digest_engine(type->type);
#endif
/*
* If there are engines involved or EVP_MD_CTX_FLAG_NO_INIT is set then we
* should use legacy handling for now.
*/
if (ctx->engine != NULL
|| impl != NULL
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
|| tmpimpl != NULL
#endif
|| (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0) {
if (ctx->digest == ctx->fetched_digest)
ctx->digest = NULL;
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = NULL;
goto legacy;
}
if (ctx->digest != NULL && ctx->digest->ctx_size > 0) {
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
ctx->md_data = NULL;
}
/* Start of non-legacy code below */
if (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
EVP_MD *provmd = EVP_MD_fetch(NULL, OBJ_nid2sn(type->type), "");
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 (ctx->provctx != NULL && ctx->digest != NULL && ctx->digest != type) {
if (ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->provctx);
ctx->provctx = NULL;
}
if (type->prov != NULL && ctx->fetched_digest != type) {
if (!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->provctx == NULL) {
ctx->provctx = ctx->digest->newctx(ossl_provider_ctx(type->prov));
if (ctx->provctx == 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->provctx, params);
/* Code below to be removed when legacy support is dropped. */
legacy:
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
if (type) {
if (impl != NULL) {
if (!ENGINE_init(impl)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
return 0;
}
} else {
/* Ask if an ENGINE is reserved for this job */
impl = tmpimpl;
}
if (impl != NULL) {
/* There's an ENGINE for this job ... (apparently) */
const EVP_MD *d = ENGINE_get_digest(impl, type->type);
if (d == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
ENGINE_finish(impl);
return 0;
}
/* We'll use the ENGINE's private digest definition */
type = d;
/*
* Store the ENGINE functional reference so we know 'type' came
* from an ENGINE and we need to release it when done.
*/
ctx->engine = impl;
} else
ctx->engine = NULL;
}
#endif
if (ctx->digest != type) {
if (ctx->digest && ctx->digest->ctx_size) {
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
ctx->md_data = NULL;
}
ctx->digest = type;
if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
ctx->update = type->update;
ctx->md_data = OPENSSL_zalloc(type->ctx_size);
if (ctx->md_data == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
}
}
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
skip_to_init:
#endif
#ifndef FIPS_MODULE
if (ctx->pctx != NULL
&& (!EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
|| ctx->pctx->op.sig.signature == NULL)) {
int r;
r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
if (r <= 0 && (r != -2))
return 0;
}
#endif
if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
return 1;
return ctx->digest->init(ctx);
}
int EVP_DigestInit_ex2(EVP_MD_CTX *ctx, const EVP_MD *type,
const OSSL_PARAM params[])
{
return evp_md_init_internal(ctx, type, params, NULL);
}
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
EVP_MD_CTX_reset(ctx);
return evp_md_init_internal(ctx, type, NULL, NULL);
}
int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
return evp_md_init_internal(ctx, type, NULL, impl);
}
int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
{
if (count == 0)
return 1;
if (ctx->pctx != NULL
&& EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
&& ctx->pctx->op.sig.sigprovctx != NULL) {
/*
* 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);
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
if (ctx->digest == NULL
|| ctx->digest->prov == NULL
|| (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0)
goto legacy;
if (ctx->digest->dupdate == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
return 0;
}
return ctx->digest->dupdate(ctx->provctx, data, count);
/* Code below to be removed when legacy support is dropped. */
legacy:
return ctx->update(ctx, 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 (ctx->digest == NULL)
return 0;
sz = EVP_MD_size(ctx->digest);
if (sz < 0)
return 0;
mdsize = sz;
if (ctx->digest->prov == NULL)
goto legacy;
if (ctx->digest->dfinal == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
ret = ctx->digest->dfinal(ctx->provctx, md, &size, mdsize);
if (isize != NULL) {
if (size <= UINT_MAX) {
*isize = (int)size;
} else {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
ret = 0;
}
}
return ret;
/* Code below to be removed when legacy support is dropped. */
legacy:
OPENSSL_assert(mdsize <= EVP_MAX_MD_SIZE);
ret = ctx->digest->final(ctx, md);
if (isize != NULL)
*isize = mdsize;
if (ctx->digest->cleanup) {
ctx->digest->cleanup(ctx);
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
}
OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
return ret;
}
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 (ctx->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
return 0;
}
if (ctx->digest->prov == NULL)
goto legacy;
if (ctx->digest->dfinal == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
return 0;
}
params[i++] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &size);
params[i++] = OSSL_PARAM_construct_end();
if (EVP_MD_CTX_set_params(ctx, params) > 0)
ret = ctx->digest->dfinal(ctx->provctx, md, &size, size);
return ret;
legacy:
if (ctx->digest->flags & EVP_MD_FLAG_XOF
&& size <= INT_MAX
&& ctx->digest->md_ctrl(ctx, EVP_MD_CTRL_XOF_LEN, (int)size, NULL)) {
ret = ctx->digest->final(ctx, md);
if (ctx->digest->cleanup != NULL) {
ctx->digest->cleanup(ctx);
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
}
OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
} else {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_XOF_OR_INVALID_LENGTH);
}
return ret;
}
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)
{
unsigned char *tmp_buf;
if (in == NULL || in->digest == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
if (in->digest->prov == NULL
|| (in->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0)
goto legacy;
if (in->digest->dupctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
EVP_MD_CTX_reset(out);
if (out->fetched_digest != NULL)
EVP_MD_free(out->fetched_digest);
*out = *in;
/* NULL out pointers in case of error */
out->pctx = NULL;
out->provctx = NULL;
if (in->fetched_digest != NULL)
EVP_MD_up_ref(in->fetched_digest);
if (in->provctx != NULL) {
out->provctx = in->digest->dupctx(in->provctx);
if (out->provctx == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
return 0;
}
}
/* 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;
/* Code below to be removed when legacy support is dropped. */
legacy:
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
/* Make sure it's safe to copy a digest context using an ENGINE */
if (in->engine && !ENGINE_init(in->engine)) {
ERR_raise(ERR_LIB_EVP, ERR_R_ENGINE_LIB);
return 0;
}
#endif
if (out->digest == in->digest) {
tmp_buf = out->md_data;
EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
} else
tmp_buf = NULL;
EVP_MD_CTX_reset(out);
memcpy(out, in, sizeof(*out));
/* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
/* Null these variables, since they are getting fixed up
* properly below. Anything else may cause a memleak and/or
* double free if any of the memory allocations below fail
*/
out->md_data = NULL;
out->pctx = NULL;
if (in->md_data && out->digest->ctx_size) {
if (tmp_buf)
out->md_data = tmp_buf;
else {
out->md_data = OPENSSL_malloc(out->digest->ctx_size);
if (out->md_data == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
}
memcpy(out->md_data, in->md_data, out->digest->ctx_size);
}
out->update = in->update;
#ifndef FIPS_MODULE
if (in->pctx) {
out->pctx = EVP_PKEY_CTX_dup(in->pctx);
if (!out->pctx) {
EVP_MD_CTX_reset(out);
return 0;
}
}
#endif
if (out->digest->copy)
return out->digest->copy(out, in);
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 = EVP_MD_CTX_new();
int ret;
if (ctx == NULL)
return 0;
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
ret = EVP_DigestInit_ex(ctx, type, impl)
&& EVP_DigestUpdate(ctx, data, count)
&& EVP_DigestFinal_ex(ctx, md, size);
EVP_MD_CTX_free(ctx);
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_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 (pctx != NULL
&& (pctx->operation == EVP_PKEY_OP_VERIFYCTX
|| pctx->operation == EVP_PKEY_OP_SIGNCTX)
&& pctx->op.sig.sigprovctx != NULL
&& pctx->op.sig.signature->set_ctx_md_params != NULL)
return pctx->op.sig.signature->set_ctx_md_params(pctx->op.sig.sigprovctx,
params);
if (ctx->digest != NULL && ctx->digest->set_ctx_params != NULL)
return ctx->digest->set_ctx_params(ctx->provctx, params);
return 0;
}
const OSSL_PARAM *EVP_MD_settable_ctx_params(const EVP_MD *md)
{
void *alg;
if (md != NULL && md->settable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_MD_provider(md));
return md->settable_ctx_params(NULL, alg);
}
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.sigprovctx != NULL
&& pctx->op.sig.signature->settable_ctx_md_params != NULL)
return pctx->op.sig.signature->settable_ctx_md_params(
pctx->op.sig.sigprovctx);
if (ctx->digest != NULL && ctx->digest->settable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_MD_provider(ctx->digest));
return ctx->digest->settable_ctx_params(ctx->provctx, 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.sigprovctx != NULL
&& pctx->op.sig.signature->get_ctx_md_params != NULL)
return pctx->op.sig.signature->get_ctx_md_params(pctx->op.sig.sigprovctx,
params);
if (ctx->digest != NULL && ctx->digest->get_params != NULL)
return ctx->digest->get_ctx_params(ctx->provctx, params);
return 0;
}
const OSSL_PARAM *EVP_MD_gettable_ctx_params(const EVP_MD *md)
{
void *alg;
if (md != NULL && md->gettable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_MD_provider(md));
return md->gettable_ctx_params(NULL, alg);
}
return NULL;
}
const OSSL_PARAM *EVP_MD_CTX_gettable_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.sigprovctx != NULL
&& pctx->op.sig.signature->gettable_ctx_md_params != NULL)
return pctx->op.sig.signature->gettable_ctx_md_params(
pctx->op.sig.sigprovctx);
if (ctx->digest != NULL && ctx->digest->gettable_ctx_params != NULL) {
alg = ossl_provider_ctx(EVP_MD_provider(ctx->digest));
return ctx->digest->gettable_ctx_params(ctx->provctx, alg);
}
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)
goto legacy;
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);
goto conclude;
/* Code below to be removed when legacy support is dropped. */
legacy:
if (ctx->digest->md_ctrl == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
conclude:
if (ret <= 0)
return 0;
return ret;
}
EVP_MD *evp_md_new(void)
{
EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
if (md != NULL) {
md->lock = CRYPTO_THREAD_lock_new();
if (md->lock == NULL) {
OPENSSL_free(md);
return NULL;
}
md->refcnt = 1;
}
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];
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);
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_MALLOC_FAILURE);
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);
EVP_MD_free(md);
return NULL;
}
#endif
md->name_id = name_id;
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_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;
}
}
if ((fncnt != 0 && fncnt != 5)
|| (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.
*/
EVP_MD_free(md);
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
return NULL;
}
md->prov = prov;
if (prov != NULL)
ossl_provider_up_ref(prov);
if (!evp_md_cache_constants(md)) {
EVP_MD_free(md);
ERR_raise(ERR_LIB_EVP, EVP_R_CACHE_CONSTANTS_FAILED);
md = NULL;
}
return md;
}
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;
CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
return 1;
}
void EVP_MD_free(EVP_MD *md)
{
int i;
if (md == NULL)
return;
CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
if (i > 0)
return;
ossl_provider_free(md->prov);
CRYPTO_THREAD_lock_free(md->lock);
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_free);
}
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