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/*
* Copyright (c) 2021 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <openssl/rsa.h>
#include <openssl/obj_mac.h>
#include "fido.h"
#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x3050200fL
static EVP_MD *
rs1_get_EVP_MD(void)
{
const EVP_MD *from;
EVP_MD *to = NULL;
if ((from = EVP_sha1()) != NULL && (to = malloc(sizeof(*to))) != NULL)
memcpy(to, from, sizeof(*to));
return (to);
}
static void
rs1_free_EVP_MD(EVP_MD *md)
{
freezero(md, sizeof(*md));
}
#elif OPENSSL_VERSION_NUMBER >= 0x30000000
static EVP_MD *
rs1_get_EVP_MD(void)
{
return (EVP_MD_fetch(NULL, "SHA-1", NULL));
}
static void
rs1_free_EVP_MD(EVP_MD *md)
{
EVP_MD_free(md);
}
#else
static EVP_MD *
rs1_get_EVP_MD(void)
{
const EVP_MD *md;
if ((md = EVP_sha1()) == NULL)
return (NULL);
return (EVP_MD_meth_dup(md));
}
static void
rs1_free_EVP_MD(EVP_MD *md)
{
EVP_MD_meth_free(md);
}
#endif /* LIBRESSL_VERSION_NUMBER */
int
rs1_verify_sig(const fido_blob_t *dgst, EVP_PKEY *pkey,
const fido_blob_t *sig)
{
EVP_PKEY_CTX *pctx = NULL;
EVP_MD *md = NULL;
int ok = -1;
if (EVP_PKEY_base_id(pkey) != EVP_PKEY_RSA) {
fido_log_debug("%s: EVP_PKEY_base_id", __func__);
goto fail;
}
if ((md = rs1_get_EVP_MD()) == NULL) {
fido_log_debug("%s: rs1_get_EVP_MD", __func__);
goto fail;
}
if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL ||
EVP_PKEY_verify_init(pctx) != 1 ||
EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PADDING) != 1 ||
EVP_PKEY_CTX_set_signature_md(pctx, md) != 1) {
fido_log_debug("%s: EVP_PKEY_CTX", __func__);
goto fail;
}
if (EVP_PKEY_verify(pctx, sig->ptr, sig->len, dgst->ptr,
dgst->len) != 1) {
fido_log_debug("%s: EVP_PKEY_verify", __func__);
goto fail;
}
ok = 0;
fail:
EVP_PKEY_CTX_free(pctx);
rs1_free_EVP_MD(md);
return (ok);
}
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