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openssl/crypto/evp/signature.c

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/*
* Copyright 2006-2025 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 <openssl/err.h>
#include <stdio.h>
#include <stdlib.h>
#include <openssl/core_names.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include "internal/numbers.h" /* includes SIZE_MAX */
#include "internal/cryptlib.h"
#include "internal/provider.h"
#include "internal/core.h"
#include "crypto/evp.h"
#include "evp_local.h"
static void evp_signature_free(void *data)
{
EVP_SIGNATURE_free(data);
}
static int evp_signature_up_ref(void *data)
{
return EVP_SIGNATURE_up_ref(data);
}
static EVP_SIGNATURE *evp_signature_new(OSSL_PROVIDER *prov)
{
EVP_SIGNATURE *signature = OPENSSL_zalloc(sizeof(EVP_SIGNATURE));
if (signature == NULL)
return NULL;
if (!CRYPTO_NEW_REF(&signature->refcnt, 1)
|| !ossl_provider_up_ref(prov)) {
CRYPTO_FREE_REF(&signature->refcnt);
OPENSSL_free(signature);
return NULL;
}
signature->prov = prov;
return signature;
}
static void *evp_signature_from_algorithm(int name_id,
const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
const OSSL_DISPATCH *fns = algodef->implementation;
EVP_SIGNATURE *signature = NULL;
const char *desc;
/* Counts newctx / freectx */
int ctxfncnt = 0;
/* Counts all init functions */
int initfncnt = 0;
/* Counts all parameter functions */
int gparamfncnt = 0, sparamfncnt = 0, gmdparamfncnt = 0, smdparamfncnt = 0;
int valid = 0;
if ((signature = evp_signature_new(prov)) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
goto err;
}
signature->name_id = name_id;
if ((signature->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
goto err;
signature->description = algodef->algorithm_description;
desc = signature->description != NULL ? signature->description : "";
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_SIGNATURE_NEWCTX:
if (signature->newctx != NULL)
break;
signature->newctx = OSSL_FUNC_signature_newctx(fns);
ctxfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SIGN_INIT:
if (signature->sign_init != NULL)
break;
signature->sign_init = OSSL_FUNC_signature_sign_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SIGN:
if (signature->sign != NULL)
break;
signature->sign = OSSL_FUNC_signature_sign(fns);
break;
case OSSL_FUNC_SIGNATURE_SIGN_MESSAGE_INIT:
if (signature->sign_message_init != NULL)
break;
signature->sign_message_init
= OSSL_FUNC_signature_sign_message_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SIGN_MESSAGE_UPDATE:
if (signature->sign_message_update != NULL)
break;
signature->sign_message_update
= OSSL_FUNC_signature_sign_message_update(fns);
break;
case OSSL_FUNC_SIGNATURE_SIGN_MESSAGE_FINAL:
if (signature->sign_message_final != NULL)
break;
signature->sign_message_final
= OSSL_FUNC_signature_sign_message_final(fns);
break;
case OSSL_FUNC_SIGNATURE_VERIFY_INIT:
if (signature->verify_init != NULL)
break;
signature->verify_init = OSSL_FUNC_signature_verify_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_VERIFY:
if (signature->verify != NULL)
break;
signature->verify = OSSL_FUNC_signature_verify(fns);
break;
case OSSL_FUNC_SIGNATURE_VERIFY_MESSAGE_INIT:
if (signature->verify_message_init != NULL)
break;
signature->verify_message_init
= OSSL_FUNC_signature_verify_message_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_VERIFY_MESSAGE_UPDATE:
if (signature->verify_message_update != NULL)
break;
signature->verify_message_update
= OSSL_FUNC_signature_verify_message_update(fns);
break;
case OSSL_FUNC_SIGNATURE_VERIFY_MESSAGE_FINAL:
if (signature->verify_message_final != NULL)
break;
signature->verify_message_final
= OSSL_FUNC_signature_verify_message_final(fns);
break;
case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT:
if (signature->verify_recover_init != NULL)
break;
signature->verify_recover_init
= OSSL_FUNC_signature_verify_recover_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER:
if (signature->verify_recover != NULL)
break;
signature->verify_recover
= OSSL_FUNC_signature_verify_recover(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT:
if (signature->digest_sign_init != NULL)
break;
signature->digest_sign_init
= OSSL_FUNC_signature_digest_sign_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE:
if (signature->digest_sign_update != NULL)
break;
signature->digest_sign_update
= OSSL_FUNC_signature_digest_sign_update(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL:
if (signature->digest_sign_final != NULL)
break;
signature->digest_sign_final
= OSSL_FUNC_signature_digest_sign_final(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_SIGN:
if (signature->digest_sign != NULL)
break;
signature->digest_sign
= OSSL_FUNC_signature_digest_sign(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT:
if (signature->digest_verify_init != NULL)
break;
signature->digest_verify_init
= OSSL_FUNC_signature_digest_verify_init(fns);
initfncnt++;
break;
case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE:
if (signature->digest_verify_update != NULL)
break;
signature->digest_verify_update
= OSSL_FUNC_signature_digest_verify_update(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL:
if (signature->digest_verify_final != NULL)
break;
signature->digest_verify_final
= OSSL_FUNC_signature_digest_verify_final(fns);
break;
case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY:
if (signature->digest_verify != NULL)
break;
signature->digest_verify
= OSSL_FUNC_signature_digest_verify(fns);
break;
case OSSL_FUNC_SIGNATURE_FREECTX:
if (signature->freectx != NULL)
break;
signature->freectx = OSSL_FUNC_signature_freectx(fns);
ctxfncnt++;
break;
case OSSL_FUNC_SIGNATURE_DUPCTX:
if (signature->dupctx != NULL)
break;
signature->dupctx = OSSL_FUNC_signature_dupctx(fns);
break;
case OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS:
if (signature->get_ctx_params != NULL)
break;
signature->get_ctx_params
= OSSL_FUNC_signature_get_ctx_params(fns);
gparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS:
if (signature->gettable_ctx_params != NULL)
break;
signature->gettable_ctx_params
= OSSL_FUNC_signature_gettable_ctx_params(fns);
gparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS:
if (signature->set_ctx_params != NULL)
break;
signature->set_ctx_params
= OSSL_FUNC_signature_set_ctx_params(fns);
sparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS:
if (signature->settable_ctx_params != NULL)
break;
signature->settable_ctx_params
= OSSL_FUNC_signature_settable_ctx_params(fns);
sparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS:
if (signature->get_ctx_md_params != NULL)
break;
signature->get_ctx_md_params
= OSSL_FUNC_signature_get_ctx_md_params(fns);
gmdparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS:
if (signature->gettable_ctx_md_params != NULL)
break;
signature->gettable_ctx_md_params
= OSSL_FUNC_signature_gettable_ctx_md_params(fns);
gmdparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS:
if (signature->set_ctx_md_params != NULL)
break;
signature->set_ctx_md_params
= OSSL_FUNC_signature_set_ctx_md_params(fns);
smdparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS:
if (signature->settable_ctx_md_params != NULL)
break;
signature->settable_ctx_md_params
= OSSL_FUNC_signature_settable_ctx_md_params(fns);
smdparamfncnt++;
break;
case OSSL_FUNC_SIGNATURE_QUERY_KEY_TYPES:
if (signature->query_key_types != NULL)
break;
signature->query_key_types
= OSSL_FUNC_signature_query_key_types(fns);
break;
}
}
/*
* In order to be a consistent set of functions we must have at least
* a set of context functions (newctx and freectx) as well as a set of
* "signature" functions. Because there's an overlap between some sets
* of functions, counters don't always cut it, we must test known
* combinations.
* We start by assuming the implementation is valid, and then look for
* reasons it's not.
*/
valid = 1;
/* Start with the ones where counters say enough */
if (ctxfncnt != 2) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s newctx or freectx:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& ((gparamfncnt != 0 && gparamfncnt != 2)
|| (sparamfncnt != 0 && sparamfncnt != 2)
|| (gmdparamfncnt != 0 && gmdparamfncnt != 2)
|| (smdparamfncnt != 0 && smdparamfncnt != 2))) {
/*
* Params functions are optional, but if defined, they must
* be pairwise complete sets, i.e. a getter must have an
* associated gettable, etc
*/
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s params getter or setter:%s", signature->type_name, desc);
valid = 0;
}
if (valid && initfncnt == 0) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s init:%s", signature->type_name, desc);
valid = 0;
}
/* Now we check for function combinations */
if (valid
&& ((signature->sign_init != NULL
&& signature->sign == NULL)
|| (signature->sign_message_init != NULL
&& signature->sign == NULL
&& (signature->sign_message_update == NULL
|| signature->sign_message_final == NULL)))) {
/* sign_init function(s) with no signing function? That's weird */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s signing function:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& (signature->sign != NULL
|| signature->sign_message_update != NULL
|| signature->sign_message_final != NULL)
&& signature->sign_init == NULL
&& signature->sign_message_init == NULL) {
/* signing function(s) with no sign_init? That's odd */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s sign_init or sign_message_init:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& ((signature->verify_init != NULL
&& signature->verify == NULL)
|| (signature->verify_message_init != NULL
&& signature->verify == NULL
&& (signature->verify_message_update == NULL
|| signature->verify_message_final == NULL)))) {
/* verify_init function(s) with no verification function? That's weird */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s verification function:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& (signature->verify != NULL
|| signature->verify_message_update != NULL
|| signature->verify_message_final != NULL)
&& signature->verify_init == NULL
&& signature->verify_message_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s verify_init or verify_message_init:%s",
signature->type_name, desc);
/* verification function(s) with no verify_init? That's odd */
valid = 0;
}
if (valid
&& (signature->verify_recover_init != NULL)
&& (signature->verify_recover == NULL)) {
/* verify_recover_init function with no verify_recover? How quaint */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s verify_recover:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& (signature->digest_sign_init != NULL
&& signature->digest_sign == NULL
&& (signature->digest_sign_update == NULL
|| signature->digest_sign_final == NULL))) {
/* You can't have a digest_sign_init without *some* performing functions */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s digest_sign function:%s", signature->type_name, desc);
valid = 0;
}
if (valid
&& ((signature->digest_verify_init != NULL
&& signature->digest_verify == NULL
&& (signature->digest_verify_update == NULL
|| signature->digest_verify_final == NULL)))) {
/* You can't have a digest_verify_init without *some* performing functions */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s digest_verify function:%s", signature->type_name, desc);
valid = 0;
}
if (!valid)
goto err;
if ((signature->digest_sign != NULL
|| signature->digest_sign_update != NULL
|| signature->digest_sign_final != NULL)
&& signature->digest_sign_init == NULL) {
/* digest signing function(s) with no digest_sign_init? That's odd */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s digest_sign_init:%s", signature->type_name, desc);
goto err;
}
if ((signature->digest_verify != NULL
|| signature->digest_verify_update != NULL
|| signature->digest_verify_final != NULL)
&& signature->digest_verify_init == NULL) {
/* digest verification function(s) with no digest_verify_init? That's odd */
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"missing %s digest_verify_init:%s", signature->type_name, desc);
goto err;
}
if ((signature->sign_message_update == NULL) !=
(signature->sign_message_final == NULL)) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"only one of %s message signing update and final available:%s",
signature->type_name, desc);
goto err;
}
if ((signature->verify_message_update == NULL) !=
(signature->verify_message_final == NULL)) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"only one of %s message verification update and final available:%s",
signature->type_name, desc);
goto err;
}
if ((signature->digest_sign_update == NULL) !=
(signature->digest_sign_final == NULL)) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"only one of %s digest signing update and final available:%s",
signature->type_name, desc);
goto err;
}
if ((signature->digest_verify_update == NULL) !=
(signature->digest_verify_final == NULL)) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS,
"only one of %s digest verification update and final available:%s",
signature->type_name, desc);
goto err;
}
return signature;
err:
EVP_SIGNATURE_free(signature);
return NULL;
}
void EVP_SIGNATURE_free(EVP_SIGNATURE *signature)
{
int i;
if (signature == NULL)
return;
CRYPTO_DOWN_REF(&signature->refcnt, &i);
if (i > 0)
return;
OPENSSL_free(signature->type_name);
ossl_provider_free(signature->prov);
CRYPTO_FREE_REF(&signature->refcnt);
OPENSSL_free(signature);
}
int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature)
{
int ref = 0;
CRYPTO_UP_REF(&signature->refcnt, &ref);
return 1;
}
OSSL_PROVIDER *EVP_SIGNATURE_get0_provider(const EVP_SIGNATURE *signature)
{
return signature->prov;
}
EVP_SIGNATURE *EVP_SIGNATURE_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
const char *properties)
{
return evp_generic_fetch(ctx, OSSL_OP_SIGNATURE, algorithm, properties,
evp_signature_from_algorithm,
evp_signature_up_ref,
evp_signature_free);
}
EVP_SIGNATURE *evp_signature_fetch_from_prov(OSSL_PROVIDER *prov,
const char *algorithm,
const char *properties)
{
return evp_generic_fetch_from_prov(prov, OSSL_OP_SIGNATURE,
algorithm, properties,
evp_signature_from_algorithm,
evp_signature_up_ref,
evp_signature_free);
}
int EVP_SIGNATURE_is_a(const EVP_SIGNATURE *signature, const char *name)
{
return signature != NULL
&& evp_is_a(signature->prov, signature->name_id, NULL, name);
}
int evp_signature_get_number(const EVP_SIGNATURE *signature)
{
return signature->name_id;
}
const char *EVP_SIGNATURE_get0_name(const EVP_SIGNATURE *signature)
{
return signature->type_name;
}
const char *EVP_SIGNATURE_get0_description(const EVP_SIGNATURE *signature)
{
return signature->description;
}
void EVP_SIGNATURE_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_SIGNATURE *signature,
void *arg),
void *arg)
{
evp_generic_do_all(libctx, OSSL_OP_SIGNATURE,
(void (*)(void *, void *))fn, arg,
evp_signature_from_algorithm,
evp_signature_up_ref,
evp_signature_free);
}
int EVP_SIGNATURE_names_do_all(const EVP_SIGNATURE *signature,
void (*fn)(const char *name, void *data),
void *data)
{
if (signature->prov != NULL)
return evp_names_do_all(signature->prov, signature->name_id, fn, data);
return 1;
}
const OSSL_PARAM *EVP_SIGNATURE_gettable_ctx_params(const EVP_SIGNATURE *sig)
{
void *provctx;
if (sig == NULL || sig->gettable_ctx_params == NULL)
return NULL;
provctx = ossl_provider_ctx(EVP_SIGNATURE_get0_provider(sig));
return sig->gettable_ctx_params(NULL, provctx);
}
const OSSL_PARAM *EVP_SIGNATURE_settable_ctx_params(const EVP_SIGNATURE *sig)
{
void *provctx;
if (sig == NULL || sig->settable_ctx_params == NULL)
return NULL;
provctx = ossl_provider_ctx(EVP_SIGNATURE_get0_provider(sig));
return sig->settable_ctx_params(NULL, provctx);
}
static int evp_pkey_signature_init(EVP_PKEY_CTX *ctx, EVP_SIGNATURE *signature,
int operation, const OSSL_PARAM params[])
{
const char *desc;
int ret = 0;
void *provkey = NULL;
EVP_KEYMGMT *tmp_keymgmt = NULL;
const OSSL_PROVIDER *tmp_prov = NULL;
const char *supported_sig = NULL;
int iter;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = operation;
if (signature != NULL) {
/*
* It's important to figure out what the key type should be, and if
* that is what we have in ctx.
*/
EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
if (ctx->pkey == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
goto err;
}
/*
* Ensure that the key is provided, either natively, or as a
* cached export. We start by fetching the keymgmt with the same
* name as |ctx->pkey|, but from the provider of the signature
* method, using the same property query as when fetching the
* signature method. With the keymgmt we found (if we did), we
* try to export |ctx->pkey| to it (evp_pkey_export_to_provider()
* is smart enough to only actually export it if |tmp_keymgmt|
* is different from |ctx->pkey|'s keymgmt)
*/
tmp_prov = EVP_SIGNATURE_get0_provider(signature);
tmp_keymgmt_tofree = tmp_keymgmt =
evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
EVP_KEYMGMT_get0_name(ctx->keymgmt),
ctx->propquery);
if (tmp_keymgmt != NULL)
provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
&tmp_keymgmt, ctx->propquery);
if (tmp_keymgmt == NULL)
EVP_KEYMGMT_free(tmp_keymgmt_tofree);
if (provkey == NULL)
goto end;
/*
* Check that the signature matches the given key. This is not
* designed to work with legacy keys, so has to be done after we've
* ensured that the key is at least exported to a provider (above).
*/
if (signature->query_key_types != NULL) {
/* This is expected to be a NULL-terminated array */
const char **keytypes;
keytypes = signature->query_key_types();
for (; *keytypes != NULL; keytypes++)
if (EVP_PKEY_CTX_is_a(ctx, *keytypes))
break;
if (*keytypes == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_SIGNATURE_TYPE_AND_KEY_TYPE_INCOMPATIBLE);
return -2;
}
} else {
/*
* Fallback 1:
* check if the keytype is the same as the signature algorithm name
*/
const char *keytype = EVP_KEYMGMT_get0_name(ctx->keymgmt);
int ok = EVP_SIGNATURE_is_a(signature, keytype);
/*
* Fallback 2:
* query the pkey for a default signature algorithm name, and check
* if it matches the signature implementation
*/
if (!ok) {
const char *signame
= evp_keymgmt_util_query_operation_name(ctx->keymgmt,
OSSL_OP_SIGNATURE);
ok = EVP_SIGNATURE_is_a(signature, signame);
}
/* If none of the fallbacks helped, we're lost */
if (!ok) {
ERR_raise(ERR_LIB_EVP, EVP_R_SIGNATURE_TYPE_AND_KEY_TYPE_INCOMPATIBLE);
return -2;
}
}
if (!EVP_SIGNATURE_up_ref(signature))
return 0;
} else {
/* Without a pre-fetched signature, it must be figured out somehow */
ERR_set_mark();
if (evp_pkey_ctx_is_legacy(ctx))
goto legacy;
if (ctx->pkey == NULL) {
ERR_clear_last_mark();
ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
goto err;
}
/*
* Try to derive the supported signature from |ctx->keymgmt|.
*/
if (!ossl_assert(ctx->pkey->keymgmt == NULL
|| ctx->pkey->keymgmt == ctx->keymgmt)) {
ERR_clear_last_mark();
ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
goto err;
}
supported_sig
= evp_keymgmt_util_query_operation_name(ctx->keymgmt,
OSSL_OP_SIGNATURE);
if (supported_sig == NULL) {
ERR_clear_last_mark();
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
goto err;
}
/*
* We perform two iterations:
*
* 1. Do the normal signature fetch, using the fetching data given by
* the EVP_PKEY_CTX.
* 2. Do the provider specific signature fetch, from the same provider
* as |ctx->keymgmt|
*
* We then try to fetch the keymgmt from the same provider as the
* signature, and try to export |ctx->pkey| to that keymgmt (when
* this keymgmt happens to be the same as |ctx->keymgmt|, the export
* is a no-op, but we call it anyway to not complicate the code even
* more).
* If the export call succeeds (returns a non-NULL provider key pointer),
* we're done and can perform the operation itself. If not, we perform
* the second iteration, or jump to legacy.
*/
for (iter = 1; iter < 3 && provkey == NULL; iter++) {
EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
/*
* If we're on the second iteration, free the results from the first.
* They are NULL on the first iteration, so no need to check what
* iteration we're on.
*/
EVP_SIGNATURE_free(signature);
EVP_KEYMGMT_free(tmp_keymgmt);
switch (iter) {
case 1:
signature =
EVP_SIGNATURE_fetch(ctx->libctx, supported_sig, ctx->propquery);
if (signature != NULL)
tmp_prov = EVP_SIGNATURE_get0_provider(signature);
break;
case 2:
tmp_prov = EVP_KEYMGMT_get0_provider(ctx->keymgmt);
signature =
evp_signature_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
supported_sig, ctx->propquery);
if (signature == NULL)
goto legacy;
break;
}
if (signature == NULL)
continue;
/*
* Ensure that the key is provided, either natively, or as a
* cached export. We start by fetching the keymgmt with the same
* name as |ctx->pkey|, but from the provider of the signature
* method, using the same property query as when fetching the
* signature method. With the keymgmt we found (if we did), we
* try to export |ctx->pkey| to it (evp_pkey_export_to_provider()
* is smart enough to only actually export it if |tmp_keymgmt|
* is different from |ctx->pkey|'s keymgmt)
*/
tmp_keymgmt_tofree = tmp_keymgmt =
evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
EVP_KEYMGMT_get0_name(ctx->keymgmt),
ctx->propquery);
if (tmp_keymgmt != NULL)
provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
&tmp_keymgmt, ctx->propquery);
if (tmp_keymgmt == NULL)
EVP_KEYMGMT_free(tmp_keymgmt_tofree);
}
if (provkey == NULL) {
EVP_SIGNATURE_free(signature);
goto legacy;
}
ERR_pop_to_mark();
}
/* No more legacy from here down to legacy: */
ctx->op.sig.signature = signature;
desc = signature->description != NULL ? signature->description : "";
ctx->op.sig.algctx =
signature->newctx(ossl_provider_ctx(signature->prov), ctx->propquery);
if (ctx->op.sig.algctx == NULL) {
/* The provider key can stay in the cache */
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
goto err;
}
switch (operation) {
case EVP_PKEY_OP_SIGN:
if (signature->sign_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s sign_init:%s", signature->type_name, desc);
ret = -2;
goto err;
}
ret = signature->sign_init(ctx->op.sig.algctx, provkey, params);
break;
case EVP_PKEY_OP_SIGNMSG:
if (signature->sign_message_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s sign_message_init:%s", signature->type_name, desc);
ret = -2;
goto err;
}
ret = signature->sign_message_init(ctx->op.sig.algctx, provkey, params);
break;
case EVP_PKEY_OP_VERIFY:
if (signature->verify_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_init:%s", signature->type_name, desc);
ret = -2;
goto err;
}
ret = signature->verify_init(ctx->op.sig.algctx, provkey, params);
break;
case EVP_PKEY_OP_VERIFYMSG:
if (signature->verify_message_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_message_init:%s", signature->type_name, desc);
ret = -2;
goto err;
}
ret = signature->verify_message_init(ctx->op.sig.algctx, provkey, params);
break;
case EVP_PKEY_OP_VERIFYRECOVER:
if (signature->verify_recover_init == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_recover_init:%s", signature->type_name, desc);
ret = -2;
goto err;
}
ret = signature->verify_recover_init(ctx->op.sig.algctx, provkey, params);
break;
default:
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
goto err;
}
if (ret <= 0) {
signature->freectx(ctx->op.sig.algctx);
ctx->op.sig.algctx = NULL;
goto err;
}
goto end;
legacy:
/*
* If we don't have the full support we need with provided methods,
* let's go see if legacy does.
*/
ERR_pop_to_mark();
EVP_KEYMGMT_free(tmp_keymgmt);
tmp_keymgmt = NULL;
if (ctx->pmeth == NULL
|| (operation == EVP_PKEY_OP_SIGN && ctx->pmeth->sign == NULL)
|| (operation == EVP_PKEY_OP_VERIFY && ctx->pmeth->verify == NULL)
|| (operation == EVP_PKEY_OP_VERIFYRECOVER
&& ctx->pmeth->verify_recover == NULL)) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
switch (operation) {
case EVP_PKEY_OP_SIGN:
if (ctx->pmeth->sign_init == NULL)
return 1;
ret = ctx->pmeth->sign_init(ctx);
break;
case EVP_PKEY_OP_VERIFY:
if (ctx->pmeth->verify_init == NULL)
return 1;
ret = ctx->pmeth->verify_init(ctx);
break;
case EVP_PKEY_OP_VERIFYRECOVER:
if (ctx->pmeth->verify_recover_init == NULL)
return 1;
ret = ctx->pmeth->verify_recover_init(ctx);
break;
default:
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
goto err;
}
if (ret <= 0)
goto err;
end:
#ifndef FIPS_MODULE
if (ret > 0)
ret = evp_pkey_ctx_use_cached_data(ctx);
#endif
EVP_KEYMGMT_free(tmp_keymgmt);
return ret;
err:
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = EVP_PKEY_OP_UNDEFINED;
EVP_KEYMGMT_free(tmp_keymgmt);
return ret;
}
int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_SIGN, NULL);
}
int EVP_PKEY_sign_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_SIGN, params);
}
int EVP_PKEY_sign_init_ex2(EVP_PKEY_CTX *ctx,
EVP_SIGNATURE *algo, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, algo, EVP_PKEY_OP_SIGN, params);
}
int EVP_PKEY_sign_message_init(EVP_PKEY_CTX *ctx,
EVP_SIGNATURE *algo, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, algo, EVP_PKEY_OP_SIGNMSG, params);
}
int EVP_PKEY_sign_message_update(EVP_PKEY_CTX *ctx,
const unsigned char *in, size_t inlen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_SIGNMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->sign_message_update == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s sign_message_update:%s", signature->type_name, desc);
return -2;
}
ret = signature->sign_message_update(ctx->op.sig.algctx, in, inlen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s sign_message_update:%s", signature->type_name, desc);
return ret;
}
int EVP_PKEY_sign_message_final(EVP_PKEY_CTX *ctx,
unsigned char *sig, size_t *siglen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_SIGNMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->sign_message_final == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s sign_message_final:%s", signature->type_name, desc);
return -2;
}
ret = signature->sign_message_final(ctx->op.sig.algctx, sig, siglen,
(sig == NULL) ? 0 : *siglen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s sign_message_final:%s", signature->type_name, desc);
return ret;
}
int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbslen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_SIGN
&& ctx->operation != EVP_PKEY_OP_SIGNMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
if (ctx->op.sig.algctx == NULL)
goto legacy;
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->sign == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s sign:%s", signature->type_name, desc);
return -2;
}
ret = signature->sign(ctx->op.sig.algctx, sig, siglen,
(sig == NULL) ? 0 : *siglen, tbs, tbslen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s sign:%s", signature->type_name, desc);
return ret;
legacy:
if (ctx->pmeth == NULL || ctx->pmeth->sign == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
}
int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFY, NULL);
}
int EVP_PKEY_verify_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFY, params);
}
int EVP_PKEY_verify_init_ex2(EVP_PKEY_CTX *ctx,
EVP_SIGNATURE *algo, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, algo, EVP_PKEY_OP_VERIFY, params);
}
int EVP_PKEY_verify_message_init(EVP_PKEY_CTX *ctx,
EVP_SIGNATURE *algo, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, algo, EVP_PKEY_OP_VERIFYMSG, params);
}
int EVP_PKEY_CTX_set_signature(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen)
{
OSSL_PARAM sig_params[2], *p = sig_params;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
*p++ = OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_SIGNATURE,
/*
* Cast away the const. This is
* read only so should be safe
*/
(char *)sig, siglen);
*p = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, sig_params);
}
int EVP_PKEY_verify_message_update(EVP_PKEY_CTX *ctx,
const unsigned char *in, size_t inlen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_VERIFYMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->verify_message_update == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_message_update:%s", signature->type_name, desc);
return -2;
}
ret = signature->verify_message_update(ctx->op.sig.algctx, in, inlen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s verify_message_update:%s", signature->type_name, desc);
return ret;
}
int EVP_PKEY_verify_message_final(EVP_PKEY_CTX *ctx)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_VERIFYMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->verify_message_final == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_message_final:%s", signature->type_name, desc);
return -2;
}
/* The signature must have been set with EVP_PKEY_CTX_set_signature() */
ret = signature->verify_message_final(ctx->op.sig.algctx);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s verify_message_final:%s", signature->type_name, desc);
return ret;
}
int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_VERIFY
&& ctx->operation != EVP_PKEY_OP_VERIFYMSG) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
if (ctx->op.sig.algctx == NULL)
goto legacy;
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->verify == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify:%s", signature->type_name, desc);
return -2;
}
ret = ctx->op.sig.signature->verify(ctx->op.sig.algctx, sig, siglen,
tbs, tbslen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s verify:%s", signature->type_name, desc);
return ret;
legacy:
if (ctx->pmeth == NULL || ctx->pmeth->verify == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
}
int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFYRECOVER, NULL);
}
int EVP_PKEY_verify_recover_init_ex(EVP_PKEY_CTX *ctx,
const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFYRECOVER, params);
}
int EVP_PKEY_verify_recover_init_ex2(EVP_PKEY_CTX *ctx,
EVP_SIGNATURE *algo, const OSSL_PARAM params[])
{
return evp_pkey_signature_init(ctx, algo, EVP_PKEY_OP_VERIFYRECOVER, params);
}
int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
unsigned char *rout, size_t *routlen,
const unsigned char *sig, size_t siglen)
{
EVP_SIGNATURE *signature;
const char *desc;
int ret;
if (ctx == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
return -1;
}
if (ctx->op.sig.algctx == NULL)
goto legacy;
signature = ctx->op.sig.signature;
desc = signature->description != NULL ? signature->description : "";
if (signature->verify_recover == NULL) {
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_NOT_SUPPORTED,
"%s verify_recover:%s", signature->type_name, desc);
return -2;
}
ret = signature->verify_recover(ctx->op.sig.algctx, rout, routlen,
(rout == NULL ? 0 : *routlen), sig, siglen);
if (ret <= 0)
ERR_raise_data(ERR_LIB_EVP, EVP_R_PROVIDER_SIGNATURE_FAILURE,
"%s verify_recover:%s", signature->type_name, desc);
return ret;
legacy:
if (ctx->pmeth == NULL || ctx->pmeth->verify_recover == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
}
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