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pmeth_lib.c
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/*
* Copyright 2006-2024 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
*/
/*
* Low level key APIs (DH etc) are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <stdlib.h>
#ifndef FIPS_MODULE
# include <openssl/engine.h>
#endif
#include <openssl/evp.h>
#include <openssl/core_names.h>
#include <openssl/dh.h>
#include <openssl/rsa.h>
#include <openssl/kdf.h>
#include "internal/cryptlib.h"
#ifndef FIPS_MODULE
# include "crypto/asn1.h"
#endif
#include "crypto/evp.h"
#include "crypto/dh.h"
#include "crypto/ec.h"
#include "internal/ffc.h"
#include "internal/numbers.h"
#include "internal/provider.h"
#include "evp_local.h"
#ifndef FIPS_MODULE
static int evp_pkey_ctx_store_cached_data(EVP_PKEY_CTX *ctx,
int keytype, int optype,
int cmd, const char *name,
const void *data, size_t data_len);
static void evp_pkey_ctx_free_cached_data(EVP_PKEY_CTX *ctx,
int cmd, const char *name);
static void evp_pkey_ctx_free_all_cached_data(EVP_PKEY_CTX *ctx);
typedef const EVP_PKEY_METHOD *(*pmeth_fn)(void);
typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
static STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
/* This array needs to be in order of NIDs */
static pmeth_fn standard_methods[] = {
ossl_rsa_pkey_method,
# ifndef OPENSSL_NO_DH
ossl_dh_pkey_method,
# endif
# ifndef OPENSSL_NO_DSA
ossl_dsa_pkey_method,
# endif
# ifndef OPENSSL_NO_EC
ossl_ec_pkey_method,
# endif
ossl_rsa_pss_pkey_method,
# ifndef OPENSSL_NO_DH
ossl_dhx_pkey_method,
# endif
# ifndef OPENSSL_NO_ECX
ossl_ecx25519_pkey_method,
ossl_ecx448_pkey_method,
ossl_ed25519_pkey_method,
ossl_ed448_pkey_method,
# endif
};
DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, pmeth_fn, pmeth_func);
static int pmeth_func_cmp(const EVP_PKEY_METHOD *const *a, pmeth_fn const *b)
{
return ((*a)->pkey_id - ((**b)())->pkey_id);
}
IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, pmeth_fn, pmeth_func);
static int pmeth_cmp(const EVP_PKEY_METHOD *const *a,
const EVP_PKEY_METHOD *const *b)
{
return ((*a)->pkey_id - (*b)->pkey_id);
}
static const EVP_PKEY_METHOD *evp_pkey_meth_find_added_by_application(int type)
{
if (app_pkey_methods != NULL) {
int idx;
EVP_PKEY_METHOD tmp;
tmp.pkey_id = type;
idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
if (idx >= 0)
return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
}
return NULL;
}
const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
{
pmeth_fn *ret;
EVP_PKEY_METHOD tmp;
const EVP_PKEY_METHOD *t;
if ((t = evp_pkey_meth_find_added_by_application(type)) != NULL)
return t;
tmp.pkey_id = type;
t = &tmp;
ret = OBJ_bsearch_pmeth_func(&t, standard_methods,
OSSL_NELEM(standard_methods));
if (ret == NULL || *ret == NULL)
return NULL;
return (**ret)();
}
EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags)
{
EVP_PKEY_METHOD *pmeth;
pmeth = OPENSSL_zalloc(sizeof(*pmeth));
if (pmeth == NULL)
return NULL;
pmeth->pkey_id = id;
pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
return pmeth;
}
#endif /* FIPS_MODULE */
int evp_pkey_ctx_state(const EVP_PKEY_CTX *ctx)
{
if (ctx->operation == EVP_PKEY_OP_UNDEFINED)
return EVP_PKEY_STATE_UNKNOWN;
if ((EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
&& ctx->op.kex.algctx != NULL)
|| (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
&& ctx->op.sig.algctx != NULL)
|| (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
&& ctx->op.ciph.algctx != NULL)
|| (EVP_PKEY_CTX_IS_GEN_OP(ctx)
&& ctx->op.keymgmt.genctx != NULL)
|| (EVP_PKEY_CTX_IS_KEM_OP(ctx)
&& ctx->op.encap.algctx != NULL))
return EVP_PKEY_STATE_PROVIDER;
return EVP_PKEY_STATE_LEGACY;
}
static EVP_PKEY_CTX *int_ctx_new(OSSL_LIB_CTX *libctx,
EVP_PKEY *pkey, ENGINE *e,
const char *keytype, const char *propquery,
int id)
{
EVP_PKEY_CTX *ret = NULL;
const EVP_PKEY_METHOD *pmeth = NULL, *app_pmeth = NULL;
EVP_KEYMGMT *keymgmt = NULL;
/* Code below to be removed when legacy support is dropped. */
/* BEGIN legacy */
if (id == -1) {
if (pkey != NULL && !evp_pkey_is_provided(pkey)) {
id = pkey->type;
} else {
if (pkey != NULL) {
/* Must be provided if we get here */
keytype = EVP_KEYMGMT_get0_name(pkey->keymgmt);
}
#ifndef FIPS_MODULE
if (keytype != NULL) {
id = evp_pkey_name2type(keytype);
if (id == NID_undef)
id = -1;
}
#endif
}
}
/* If no ID was found here, we can only resort to find a keymgmt */
if (id == -1) {
#ifndef FIPS_MODULE
/* Using engine with a key without id will not work */
if (e != NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_ALGORITHM);
return NULL;
}
#endif
goto common;
}
#ifndef FIPS_MODULE
/*
* Here, we extract what information we can for the purpose of
* supporting usage with implementations from providers, to make
* for a smooth transition from legacy stuff to provider based stuff.
*
* If an engine is given, this is entirely legacy, and we should not
* pretend anything else, so we clear the name.
*/
if (e != NULL)
keytype = NULL;
if (e == NULL && (pkey == NULL || pkey->foreign == 0))
keytype = OBJ_nid2sn(id);
# ifndef OPENSSL_NO_ENGINE
if (e == NULL && pkey != NULL)
e = pkey->pmeth_engine != NULL ? pkey->pmeth_engine : pkey->engine;
/* Try to find an ENGINE which implements this method */
if (e != NULL) {
if (!ENGINE_init(e)) {
ERR_raise(ERR_LIB_EVP, ERR_R_ENGINE_LIB);
return NULL;
}
} else {
e = ENGINE_get_pkey_meth_engine(id);
}
/*
* If an ENGINE handled this method look it up. Otherwise use internal
* tables.
*/
if (e != NULL)
pmeth = ENGINE_get_pkey_meth(e, id);
else
# endif /* OPENSSL_NO_ENGINE */
if (pkey != NULL && pkey->foreign)
pmeth = EVP_PKEY_meth_find(id);
else
app_pmeth = pmeth = evp_pkey_meth_find_added_by_application(id);
/* END legacy */
#endif /* FIPS_MODULE */
common:
/*
* If there's no engine and no app supplied pmeth and there's a name, we try
* fetching a provider implementation.
*/
if (e == NULL && app_pmeth == NULL && keytype != NULL) {
/*
* If |pkey| is given and is provided, we take a reference to its
* keymgmt. Otherwise, we fetch one for the keytype we got. This
* is to ensure that operation init functions can access what they
* need through this single pointer.
*/
if (pkey != NULL && pkey->keymgmt != NULL) {
if (!EVP_KEYMGMT_up_ref(pkey->keymgmt))
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
else
keymgmt = pkey->keymgmt;
} else {
keymgmt = EVP_KEYMGMT_fetch(libctx, keytype, propquery);
}
if (keymgmt == NULL)
return NULL; /* EVP_KEYMGMT_fetch() recorded an error */
#ifndef FIPS_MODULE
/*
* Chase down the legacy NID, as that might be needed for diverse
* purposes, such as ensure that EVP_PKEY_type() can return sensible
* values. We go through all keymgmt names, because the keytype
* that's passed to this function doesn't necessarily translate
* directly.
*/
if (keymgmt != NULL) {
int tmp_id = evp_keymgmt_get_legacy_alg(keymgmt);
if (tmp_id != NID_undef) {
if (id == -1) {
id = tmp_id;
} else {
/*
* It really really shouldn't differ. If it still does,
* something is very wrong.
*/
if (!ossl_assert(id == tmp_id)) {
ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
EVP_KEYMGMT_free(keymgmt);
return NULL;
}
}
}
}
#endif
}
if (pmeth == NULL && keymgmt == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_ALGORITHM);
} else {
ret = OPENSSL_zalloc(sizeof(*ret));
}
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
if ((ret == NULL || pmeth == NULL) && e != NULL)
ENGINE_finish(e);
#endif
if (ret == NULL) {
EVP_KEYMGMT_free(keymgmt);
return NULL;
}
if (propquery != NULL) {
ret->propquery = OPENSSL_strdup(propquery);
if (ret->propquery == NULL) {
OPENSSL_free(ret);
EVP_KEYMGMT_free(keymgmt);
return NULL;
}
}
ret->libctx = libctx;
ret->keytype = keytype;
ret->keymgmt = keymgmt;
ret->legacy_keytype = id;
ret->engine = e;
ret->pmeth = pmeth;
ret->operation = EVP_PKEY_OP_UNDEFINED;
ret->pkey = pkey;
if (pkey != NULL)
EVP_PKEY_up_ref(pkey);
if (pmeth != NULL && pmeth->init != NULL) {
if (pmeth->init(ret) <= 0) {
ret->pmeth = NULL;
EVP_PKEY_CTX_free(ret);
return NULL;
}
}
return ret;
}
/*- All methods below can also be used in FIPS_MODULE */
EVP_PKEY_CTX *EVP_PKEY_CTX_new_from_name(OSSL_LIB_CTX *libctx,
const char *name,
const char *propquery)
{
return int_ctx_new(libctx, NULL, NULL, name, propquery, -1);
}
EVP_PKEY_CTX *EVP_PKEY_CTX_new_from_pkey(OSSL_LIB_CTX *libctx, EVP_PKEY *pkey,
const char *propquery)
{
return int_ctx_new(libctx, pkey, NULL, NULL, propquery, -1);
}
void evp_pkey_ctx_free_old_ops(EVP_PKEY_CTX *ctx)
{
if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
if (ctx->op.sig.algctx != NULL && ctx->op.sig.signature != NULL)
ctx->op.sig.signature->freectx(ctx->op.sig.algctx);
EVP_SIGNATURE_free(ctx->op.sig.signature);
ctx->op.sig.algctx = NULL;
ctx->op.sig.signature = NULL;
} else if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
if (ctx->op.kex.algctx != NULL && ctx->op.kex.exchange != NULL)
ctx->op.kex.exchange->freectx(ctx->op.kex.algctx);
EVP_KEYEXCH_free(ctx->op.kex.exchange);
ctx->op.kex.algctx = NULL;
ctx->op.kex.exchange = NULL;
} else if (EVP_PKEY_CTX_IS_KEM_OP(ctx)) {
if (ctx->op.encap.algctx != NULL && ctx->op.encap.kem != NULL)
ctx->op.encap.kem->freectx(ctx->op.encap.algctx);
EVP_KEM_free(ctx->op.encap.kem);
ctx->op.encap.algctx = NULL;
ctx->op.encap.kem = NULL;
}
else if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
if (ctx->op.ciph.algctx != NULL && ctx->op.ciph.cipher != NULL)
ctx->op.ciph.cipher->freectx(ctx->op.ciph.algctx);
EVP_ASYM_CIPHER_free(ctx->op.ciph.cipher);
ctx->op.ciph.algctx = NULL;
ctx->op.ciph.cipher = NULL;
} else if (EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
if (ctx->op.keymgmt.genctx != NULL && ctx->keymgmt != NULL)
evp_keymgmt_gen_cleanup(ctx->keymgmt, ctx->op.keymgmt.genctx);
}
}
void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
{
if (ctx == NULL)
return;
if (ctx->pmeth && ctx->pmeth->cleanup)
ctx->pmeth->cleanup(ctx);
evp_pkey_ctx_free_old_ops(ctx);
#ifndef FIPS_MODULE
evp_pkey_ctx_free_all_cached_data(ctx);
#endif
EVP_KEYMGMT_free(ctx->keymgmt);
OPENSSL_free(ctx->propquery);
EVP_PKEY_free(ctx->pkey);
EVP_PKEY_free(ctx->peerkey);
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
ENGINE_finish(ctx->engine);
#endif
BN_free(ctx->rsa_pubexp);
OPENSSL_free(ctx);
}
#ifndef FIPS_MODULE
void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
const EVP_PKEY_METHOD *meth)
{
if (ppkey_id)
*ppkey_id = meth->pkey_id;
if (pflags)
*pflags = meth->flags;
}
void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
{
int pkey_id = dst->pkey_id;
int flags = dst->flags;
*dst = *src;
/* We only copy the function pointers so restore the other values */
dst->pkey_id = pkey_id;
dst->flags = flags;
}
void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
{
if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
OPENSSL_free(pmeth);
}
EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
{
return int_ctx_new(NULL, pkey, e, NULL, NULL, -1);
}
EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
{
return int_ctx_new(NULL, NULL, e, NULL, NULL, id);
}
EVP_PKEY_CTX *EVP_PKEY_CTX_dup(const EVP_PKEY_CTX *pctx)
{
EVP_PKEY_CTX *rctx;
# ifndef OPENSSL_NO_ENGINE
/* Make sure it's safe to copy a pkey context using an ENGINE */
if (pctx->engine && !ENGINE_init(pctx->engine)) {
ERR_raise(ERR_LIB_EVP, ERR_R_ENGINE_LIB);
return 0;
}
# endif
rctx = OPENSSL_zalloc(sizeof(*rctx));
if (rctx == NULL)
return NULL;
if (pctx->pkey != NULL)
EVP_PKEY_up_ref(pctx->pkey);
rctx->pkey = pctx->pkey;
rctx->operation = pctx->operation;
rctx->libctx = pctx->libctx;
rctx->keytype = pctx->keytype;
rctx->propquery = NULL;
if (pctx->propquery != NULL) {
rctx->propquery = OPENSSL_strdup(pctx->propquery);
if (rctx->propquery == NULL)
goto err;
}
rctx->legacy_keytype = pctx->legacy_keytype;
if (EVP_PKEY_CTX_IS_DERIVE_OP(pctx)) {
if (pctx->op.kex.exchange != NULL) {
rctx->op.kex.exchange = pctx->op.kex.exchange;
if (!EVP_KEYEXCH_up_ref(rctx->op.kex.exchange))
goto err;
}
if (pctx->op.kex.algctx != NULL) {
if (!ossl_assert(pctx->op.kex.exchange != NULL))
goto err;
if (pctx->op.kex.exchange->dupctx != NULL)
rctx->op.kex.algctx
= pctx->op.kex.exchange->dupctx(pctx->op.kex.algctx);
if (rctx->op.kex.algctx == NULL) {
EVP_KEYEXCH_free(rctx->op.kex.exchange);
rctx->op.kex.exchange = NULL;
goto err;
}
return rctx;
}
} else if (EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
if (pctx->op.sig.signature != NULL) {
rctx->op.sig.signature = pctx->op.sig.signature;
if (!EVP_SIGNATURE_up_ref(rctx->op.sig.signature))
goto err;
}
if (pctx->op.sig.algctx != NULL) {
if (!ossl_assert(pctx->op.sig.signature != NULL))
goto err;
if (pctx->op.sig.signature->dupctx != NULL)
rctx->op.sig.algctx
= pctx->op.sig.signature->dupctx(pctx->op.sig.algctx);
if (rctx->op.sig.algctx == NULL) {
EVP_SIGNATURE_free(rctx->op.sig.signature);
rctx->op.sig.signature = NULL;
goto err;
}
return rctx;
}
} else if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(pctx)) {
if (pctx->op.ciph.cipher != NULL) {
rctx->op.ciph.cipher = pctx->op.ciph.cipher;
if (!EVP_ASYM_CIPHER_up_ref(rctx->op.ciph.cipher))
goto err;
}
if (pctx->op.ciph.algctx != NULL) {
if (!ossl_assert(pctx->op.ciph.cipher != NULL))
goto err;
if (pctx->op.ciph.cipher->dupctx != NULL)
rctx->op.ciph.algctx
= pctx->op.ciph.cipher->dupctx(pctx->op.ciph.algctx);
if (rctx->op.ciph.algctx == NULL) {
EVP_ASYM_CIPHER_free(rctx->op.ciph.cipher);
rctx->op.ciph.cipher = NULL;
goto err;
}
return rctx;
}
} else if (EVP_PKEY_CTX_IS_KEM_OP(pctx)) {
if (pctx->op.encap.kem != NULL) {
rctx->op.encap.kem = pctx->op.encap.kem;
if (!EVP_KEM_up_ref(rctx->op.encap.kem))
goto err;
}
if (pctx->op.encap.algctx != NULL) {
if (!ossl_assert(pctx->op.encap.kem != NULL))
goto err;
if (pctx->op.encap.kem->dupctx != NULL)
rctx->op.encap.algctx
= pctx->op.encap.kem->dupctx(pctx->op.encap.algctx);
if (rctx->op.encap.algctx == NULL) {
EVP_KEM_free(rctx->op.encap.kem);
rctx->op.encap.kem = NULL;
goto err;
}
return rctx;
}
} else if (EVP_PKEY_CTX_IS_GEN_OP(pctx)) {
/* Not supported - This would need a gen_dupctx() to work */
goto err;
}
rctx->pmeth = pctx->pmeth;
# ifndef OPENSSL_NO_ENGINE
rctx->engine = pctx->engine;
# endif
if (pctx->peerkey != NULL)
EVP_PKEY_up_ref(pctx->peerkey);
rctx->peerkey = pctx->peerkey;
if (pctx->pmeth == NULL) {
if (rctx->operation == EVP_PKEY_OP_UNDEFINED) {
EVP_KEYMGMT *tmp_keymgmt = pctx->keymgmt;
void *provkey;
provkey = evp_pkey_export_to_provider(pctx->pkey, pctx->libctx,
&tmp_keymgmt, pctx->propquery);
if (provkey == NULL)
goto err;
if (!EVP_KEYMGMT_up_ref(tmp_keymgmt))
goto err;
EVP_KEYMGMT_free(rctx->keymgmt);
rctx->keymgmt = tmp_keymgmt;
return rctx;
}
} else if (pctx->pmeth->copy(rctx, pctx) > 0) {
return rctx;
}
err:
rctx->pmeth = NULL;
EVP_PKEY_CTX_free(rctx);
return NULL;
}
int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
{
if (app_pkey_methods == NULL) {
app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
if (app_pkey_methods == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_CRYPTO_LIB);
return 0;
}
}
if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth)) {
ERR_raise(ERR_LIB_EVP, ERR_R_CRYPTO_LIB);
return 0;
}
sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
return 1;
}
void evp_app_cleanup_int(void)
{
if (app_pkey_methods != NULL)
sk_EVP_PKEY_METHOD_pop_free(app_pkey_methods, EVP_PKEY_meth_free);
}
int EVP_PKEY_meth_remove(const EVP_PKEY_METHOD *pmeth)
{
const EVP_PKEY_METHOD *ret;
ret = sk_EVP_PKEY_METHOD_delete_ptr(app_pkey_methods, pmeth);
return ret == NULL ? 0 : 1;
}
size_t EVP_PKEY_meth_get_count(void)
{
size_t rv = OSSL_NELEM(standard_methods);
if (app_pkey_methods)
rv += sk_EVP_PKEY_METHOD_num(app_pkey_methods);
return rv;
}
const EVP_PKEY_METHOD *EVP_PKEY_meth_get0(size_t idx)
{
if (idx < OSSL_NELEM(standard_methods))
return (standard_methods[idx])();
if (app_pkey_methods == NULL)
return NULL;
idx -= OSSL_NELEM(standard_methods);
if (idx >= (size_t)sk_EVP_PKEY_METHOD_num(app_pkey_methods))
return NULL;
return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
}
#endif
int EVP_PKEY_CTX_is_a(EVP_PKEY_CTX *ctx, const char *keytype)
{
#ifndef FIPS_MODULE
if (evp_pkey_ctx_is_legacy(ctx))
return (ctx->pmeth->pkey_id == evp_pkey_name2type(keytype));
#endif
return EVP_KEYMGMT_is_a(ctx->keymgmt, keytype);
}
int EVP_PKEY_CTX_set_params(EVP_PKEY_CTX *ctx, const OSSL_PARAM *params)
{
switch (evp_pkey_ctx_state(ctx)) {
case EVP_PKEY_STATE_PROVIDER:
if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
&& ctx->op.kex.exchange != NULL
&& ctx->op.kex.exchange->set_ctx_params != NULL)
return
ctx->op.kex.exchange->set_ctx_params(ctx->op.kex.algctx,
params);
if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
&& ctx->op.sig.signature != NULL
&& ctx->op.sig.signature->set_ctx_params != NULL)
return
ctx->op.sig.signature->set_ctx_params(ctx->op.sig.algctx,
params);
if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
&& ctx->op.ciph.cipher != NULL
&& ctx->op.ciph.cipher->set_ctx_params != NULL)
return
ctx->op.ciph.cipher->set_ctx_params(ctx->op.ciph.algctx,
params);
if (EVP_PKEY_CTX_IS_GEN_OP(ctx)
&& ctx->keymgmt != NULL
&& ctx->keymgmt->gen_set_params != NULL)
return
evp_keymgmt_gen_set_params(ctx->keymgmt, ctx->op.keymgmt.genctx,
params);
if (EVP_PKEY_CTX_IS_KEM_OP(ctx)
&& ctx->op.encap.kem != NULL
&& ctx->op.encap.kem->set_ctx_params != NULL)
return
ctx->op.encap.kem->set_ctx_params(ctx->op.encap.algctx,
params);
break;
#ifndef FIPS_MODULE
case EVP_PKEY_STATE_UNKNOWN:
case EVP_PKEY_STATE_LEGACY:
return evp_pkey_ctx_set_params_to_ctrl(ctx, params);
#endif
}
return 0;
}
int EVP_PKEY_CTX_get_params(EVP_PKEY_CTX *ctx, OSSL_PARAM *params)
{
switch (evp_pkey_ctx_state(ctx)) {
case EVP_PKEY_STATE_PROVIDER:
if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
&& ctx->op.kex.exchange != NULL
&& ctx->op.kex.exchange->get_ctx_params != NULL)
return
ctx->op.kex.exchange->get_ctx_params(ctx->op.kex.algctx,
params);
if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
&& ctx->op.sig.signature != NULL
&& ctx->op.sig.signature->get_ctx_params != NULL)
return
ctx->op.sig.signature->get_ctx_params(ctx->op.sig.algctx,
params);
if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
&& ctx->op.ciph.cipher != NULL
&& ctx->op.ciph.cipher->get_ctx_params != NULL)
return
ctx->op.ciph.cipher->get_ctx_params(ctx->op.ciph.algctx,
params);
if (EVP_PKEY_CTX_IS_KEM_OP(ctx)
&& ctx->op.encap.kem != NULL
&& ctx->op.encap.kem->get_ctx_params != NULL)
return
ctx->op.encap.kem->get_ctx_params(ctx->op.encap.algctx,
params);
break;
#ifndef FIPS_MODULE
case EVP_PKEY_STATE_UNKNOWN:
case EVP_PKEY_STATE_LEGACY:
return evp_pkey_ctx_get_params_to_ctrl(ctx, params);
#endif
}
return 0;
}
#ifndef FIPS_MODULE
const OSSL_PARAM *EVP_PKEY_CTX_gettable_params(const EVP_PKEY_CTX *ctx)
{
void *provctx;
if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
&& ctx->op.kex.exchange != NULL
&& ctx->op.kex.exchange->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_KEYEXCH_get0_provider(ctx->op.kex.exchange));
return ctx->op.kex.exchange->gettable_ctx_params(ctx->op.kex.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
&& ctx->op.sig.signature != NULL
&& ctx->op.sig.signature->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(
EVP_SIGNATURE_get0_provider(ctx->op.sig.signature));
return ctx->op.sig.signature->gettable_ctx_params(ctx->op.sig.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
&& ctx->op.ciph.cipher != NULL
&& ctx->op.ciph.cipher->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(
EVP_ASYM_CIPHER_get0_provider(ctx->op.ciph.cipher));
return ctx->op.ciph.cipher->gettable_ctx_params(ctx->op.ciph.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_KEM_OP(ctx)
&& ctx->op.encap.kem != NULL
&& ctx->op.encap.kem->gettable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_KEM_get0_provider(ctx->op.encap.kem));
return ctx->op.encap.kem->gettable_ctx_params(ctx->op.encap.algctx,
provctx);
}
return NULL;
}
const OSSL_PARAM *EVP_PKEY_CTX_settable_params(const EVP_PKEY_CTX *ctx)
{
void *provctx;
if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
&& ctx->op.kex.exchange != NULL
&& ctx->op.kex.exchange->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_KEYEXCH_get0_provider(ctx->op.kex.exchange));
return ctx->op.kex.exchange->settable_ctx_params(ctx->op.kex.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
&& ctx->op.sig.signature != NULL
&& ctx->op.sig.signature->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(
EVP_SIGNATURE_get0_provider(ctx->op.sig.signature));
return ctx->op.sig.signature->settable_ctx_params(ctx->op.sig.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
&& ctx->op.ciph.cipher != NULL
&& ctx->op.ciph.cipher->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(
EVP_ASYM_CIPHER_get0_provider(ctx->op.ciph.cipher));
return ctx->op.ciph.cipher->settable_ctx_params(ctx->op.ciph.algctx,
provctx);
}
if (EVP_PKEY_CTX_IS_GEN_OP(ctx)
&& ctx->keymgmt != NULL
&& ctx->keymgmt->gen_settable_params != NULL) {
provctx = ossl_provider_ctx(EVP_KEYMGMT_get0_provider(ctx->keymgmt));
return ctx->keymgmt->gen_settable_params(ctx->op.keymgmt.genctx,
provctx);
}
if (EVP_PKEY_CTX_IS_KEM_OP(ctx)
&& ctx->op.encap.kem != NULL
&& ctx->op.encap.kem->settable_ctx_params != NULL) {
provctx = ossl_provider_ctx(EVP_KEM_get0_provider(ctx->op.encap.kem));
return ctx->op.encap.kem->settable_ctx_params(ctx->op.encap.algctx,
provctx);
}
return NULL;
}
/*
* Internal helpers for stricter EVP_PKEY_CTX_{set,get}_params().
*
* Return 1 on success, 0 or negative for errors.
*
* In particular they return -2 if any of the params is not supported.
*
* They are not available in FIPS_MODULE as they depend on
* - EVP_PKEY_CTX_{get,set}_params()
* - EVP_PKEY_CTX_{gettable,settable}_params()
*
*/
int evp_pkey_ctx_set_params_strict(EVP_PKEY_CTX *ctx, OSSL_PARAM *params)
{
if (ctx == NULL || params == NULL)
return 0;
/*
* We only check for provider side EVP_PKEY_CTX. For #legacy, we
* depend on the translation that happens in EVP_PKEY_CTX_set_params()
* call, and that the resulting ctrl call will return -2 if it doesn't
* known the ctrl command number.
*/
if (evp_pkey_ctx_is_provided(ctx)) {
const OSSL_PARAM *settable = EVP_PKEY_CTX_settable_params(ctx);
const OSSL_PARAM *p;
for (p = params; p->key != NULL; p++) {
/* Check the ctx actually understands this parameter */
if (OSSL_PARAM_locate_const(settable, p->key) == NULL)
return -2;
}
}
return EVP_PKEY_CTX_set_params(ctx, params);
}
int evp_pkey_ctx_get_params_strict(EVP_PKEY_CTX *ctx, OSSL_PARAM *params)
{
if (ctx == NULL || params == NULL)
return 0;
/*
* We only check for provider side EVP_PKEY_CTX. For #legacy, we
* depend on the translation that happens in EVP_PKEY_CTX_get_params()
* call, and that the resulting ctrl call will return -2 if it doesn't
* known the ctrl command number.
*/
if (evp_pkey_ctx_is_provided(ctx)) {
const OSSL_PARAM *gettable = EVP_PKEY_CTX_gettable_params(ctx);
const OSSL_PARAM *p;
for (p = params; p->key != NULL; p++) {
/* Check the ctx actually understands this parameter */
if (OSSL_PARAM_locate_const(gettable, p->key) == NULL)
return -2;
}
}
return EVP_PKEY_CTX_get_params(ctx, params);
}
int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **md)
{
OSSL_PARAM sig_md_params[2], *p = sig_md_params;
/* 80 should be big enough */
char name[80] = "";
const EVP_MD *tmp;
if (ctx == NULL || !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
/* Uses the same return values as EVP_PKEY_CTX_ctrl */
return -2;
}
if (ctx->op.sig.algctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG,
EVP_PKEY_CTRL_GET_MD, 0, (void *)(md));
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST,
name,
sizeof(name));
*p = OSSL_PARAM_construct_end();
if (!EVP_PKEY_CTX_get_params(ctx, sig_md_params))
return 0;
tmp = evp_get_digestbyname_ex(ctx->libctx, name);
if (tmp == NULL)
return 0;
*md = tmp;
return 1;
}
static int evp_pkey_ctx_set_md(EVP_PKEY_CTX *ctx, const EVP_MD *md,
int fallback, const char *param, int op,
int ctrl)
{
OSSL_PARAM md_params[2], *p = md_params;
const char *name;
if (ctx == NULL || (ctx->operation & op) == 0) {
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
/* Uses the same return values as EVP_PKEY_CTX_ctrl */
return -2;
}
if (fallback)
return EVP_PKEY_CTX_ctrl(ctx, -1, op, ctrl, 0, (void *)(md));
if (md == NULL) {
name = "";
} else {
name = EVP_MD_get0_name(md);
}
*p++ = OSSL_PARAM_construct_utf8_string(param,
/*
* Cast away the const. This is read
* only so should be safe
*/
(char *)name, 0);
*p = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, md_params);
}
int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
{
return evp_pkey_ctx_set_md(ctx, md, ctx->op.sig.algctx == NULL,
OSSL_SIGNATURE_PARAM_DIGEST,
EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_MD);
}
int EVP_PKEY_CTX_set_tls1_prf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
{
return evp_pkey_ctx_set_md(ctx, md, ctx->op.kex.algctx == NULL,
OSSL_KDF_PARAM_DIGEST,
EVP_PKEY_OP_DERIVE, EVP_PKEY_CTRL_TLS_MD);
}
static int evp_pkey_ctx_set1_octet_string(EVP_PKEY_CTX *ctx, int fallback,
const char *param, int op, int ctrl,
const unsigned char *data,
int datalen)
{
OSSL_PARAM octet_string_params[2], *p = octet_string_params;
if (ctx == NULL || (ctx->operation & op) == 0) {
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
/* Uses the same return values as EVP_PKEY_CTX_ctrl */
return -2;
}
/* Code below to be removed when legacy support is dropped. */
if (fallback)
return EVP_PKEY_CTX_ctrl(ctx, -1, op, ctrl, datalen, (void *)(data));
/* end of legacy support */
if (datalen < 0) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_LENGTH);
return 0;
}
*p++ = OSSL_PARAM_construct_octet_string(param,
/*
* Cast away the const. This is read
* only so should be safe
*/
(unsigned char *)data,
(size_t)datalen);
*p = OSSL_PARAM_construct_end();