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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Package: noscrypt
* File: impl/openssl.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with noscrypt. If not, see http://www.gnu.org/licenses/.
*/
/* Setup openssl */
#ifdef OPENSSL_CRYPTO_LIB
#include "nc-util.h"
#include <openssl/crypto.h>
#define _OSSL_FAIL(x) if(!(x)) return CSTATUS_FAIL;
#ifndef _IMPL_SECURE_ZERO_MEMSET
#define _IMPL_SECURE_ZERO_MEMSET _ossl_secure_zero_memset
_IMPLSTB void _ossl_secure_zero_memset(void* ptr, size_t size)
{
_sizet_check(size)
OPENSSL_cleanse(ptr, size);
}
#endif
#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE
#define _IMPL_CRYPTO_FIXED_TIME_COMPARE _ossl_fixed_time_compare
_IMPLSTB uint32_t _ossl_fixed_time_compare(const uint8_t* a, const uint8_t* b, uint32_t size)
{
int result;
_sizet_check(size)
result = CRYPTO_memcmp(a, b, size);
return (uint32_t)result;
}
#endif /* _IMPL_CRYPTO_FIXED_TIME_COMPARE */
#ifndef _IMPL_CRYPTO_SHA256_DIGEST
#include <openssl/sha.h>
#define _IMPL_CRYPTO_SHA256_DIGEST _ossl_sha256_digest
_IMPLSTB cstatus_t _ossl_sha256_digest(const cspan_t* data, sha256_t digestOut32)
{
_sizet_check(data->size)
_OSSL_FAIL(SHA256(data->data, data->size, digestOut32))
return CSTATUS_OK;
}
#endif
#ifndef _IMPL_CRYPTO_SHA256_HMAC
#include <openssl/hmac.h>
/* Export function */
#define _IMPL_CRYPTO_SHA256_HMAC _ossl_hmac_sha256
_IMPLSTB cstatus_t _ossl_hmac_sha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32)
{
unsigned int hmacLen;
_sizet_check(key->size)
_sizet_check(data->size)
hmacLen = sizeof(sha256_t);
_OSSL_FAIL(
HMAC(
EVP_sha256(),
key->data,
key->size,
data->data,
data->size,
hmacOut32,
&hmacLen
)
)
/* digest length should match the actual digest size */
_OSSL_FAIL(hmacLen != sizeof(sha256_t))
return CSTATUS_OK;
}
#endif /* !_IMPL_CRYPTO_SHA256_HMAC */
#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND
#include <openssl/hmac.h>
#include "hkdf.h"
#define _IMPL_CRYPTO_SHA256_HKDF_EXPAND _ossl_sha256_hkdf_expand
cstatus_t _ossl_hkdf_update(void* ctx, const cspan_t* data)
{
DEBUG_ASSERT(ctx != NULL)
_OSS_FAIL(HMAC_Update((HMAC_CTX*)ctx, data->data, data->size))
return CSTATUS_OK;
}
cstatus_t _ossl_hkdf_finish(void* ctx, sha256_t hmacOut32)
{
DEBUG_ASSERT(ctx != NULL)
_OSSL_FAIL(HMAC_Final((HMAC_CTX*)ctx, hmacOut32, NULL))
return CSTATUS_OK;
}
_IMPLSTB cstatus_t _ossl_fallback_hkdf_expand(const cspan_t* prk, const cspan_t* info, span_t* okm)
{
HMAC_CTX* hmac;
cstatus_t result;
struct nc_hkdf_fn_cb_struct handler;
/*
* NOTE! Hmac reusable flag must be set to allow for multiple
* calls to the finish function without losing the context.
*/
if ((hmac = HMAC_CTX_new()) == NULL)
{
return CSTATUS_FAIL;
}
_OSSL_FAIL(
HMAC_Init_ex(
hmac,
prk->data,
pkr->size,
EVP_sha256(),
NULL
)
)
handler.update = _ossl_hkdf_update;
handler.finish = _ossl_hkdf_finish;
result = hkdfExpandProcess(&handler, hmac, info, okm);
HMAC_CTX_free(hmac);
return result;
}
#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */
#endif /*!OPENSSL_CRYPTO_LIB */
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