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/** @file
HMAC-SHA256 KDF Wrapper Implementation over OpenSSL.
Copyright (c) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseCryptLib.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
/**
Derive HMAC-based Extract-and-Expand Key Derivation Function (HKDF).
@param[in] Key Pointer to the user-supplied key.
@param[in] KeySize Key size in bytes.
@param[in] Salt Pointer to the salt(non-secret) value.
@param[in] SaltSize Salt size in bytes.
@param[in] Info Pointer to the application specific info.
@param[in] InfoSize Info size in bytes.
@param[out] Out Pointer to buffer to receive hkdf value.
@param[in] OutSize Size of hkdf bytes to generate.
@retval TRUE Hkdf generated successfully.
@retval FALSE Hkdf generation failed.
**/
BOOLEAN
EFIAPI
HkdfSha256ExtractAndExpand (
IN CONST UINT8 *Key,
IN UINTN KeySize,
IN CONST UINT8 *Salt,
IN UINTN SaltSize,
IN CONST UINT8 *Info,
IN UINTN InfoSize,
OUT UINT8 *Out,
IN UINTN OutSize
)
{
EVP_PKEY_CTX *pHkdfCtx;
BOOLEAN Result;
if ((Key == NULL) || (Salt == NULL) || (Info == NULL) || (Out == NULL) ||
(KeySize > INT_MAX) || (SaltSize > INT_MAX) || (InfoSize > INT_MAX) || (OutSize > INT_MAX))
{
return FALSE;
}
pHkdfCtx = EVP_PKEY_CTX_new_id (EVP_PKEY_HKDF, NULL);
if (pHkdfCtx == NULL) {
return FALSE;
}
Result = EVP_PKEY_derive_init (pHkdfCtx) > 0;
if (Result) {
Result = EVP_PKEY_CTX_set_hkdf_md (pHkdfCtx, EVP_sha256 ()) > 0;
}
if (Result) {
Result = EVP_PKEY_CTX_set1_hkdf_salt (pHkdfCtx, Salt, (UINT32)SaltSize) > 0;
}
if (Result) {
Result = EVP_PKEY_CTX_set1_hkdf_key (pHkdfCtx, Key, (UINT32)KeySize) > 0;
}
if (Result) {
Result = EVP_PKEY_CTX_add1_hkdf_info (pHkdfCtx, Info, (UINT32)InfoSize) > 0;
}
if (Result) {
Result = EVP_PKEY_derive (pHkdfCtx, Out, &OutSize) > 0;
}
EVP_PKEY_CTX_free (pHkdfCtx);
pHkdfCtx = NULL;
return Result;
}
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