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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Crypto Component */
/** */
/** HMAC-based Extract-and-Expand Key Derivation Function (HKDF) */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* COMPONENT DEFINITION RELEASE */
/* */
/* nx_crypto_hkdf.h PORTABLE C */
/* 6.1 */
/* */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file defines the NetX HKDF algorithm, derived from RFC 5869. */
/* From user-specified input, the HKDF generates a block of data */
/* suitable for use as key material for various cryptographic */
/* protocols such as TLS 1.3. */
/* */
/* It is assumed that nx_api.h and nx_port.h have already been */
/* included. */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
#ifndef NX_CRYPTO_HKDF_H
#define NX_CRYPTO_HKDF_H
/* Determine if a C++ compiler is being used. If so, ensure that standard
C is used to process the API information. */
#ifdef __cplusplus
/* Yes, C++ compiler is present. Use standard C. */
extern "C" {
#endif
#include "nx_crypto.h"
#include "nx_crypto_sha2.h"
#include "nx_crypto_hmac_sha5.h"
typedef struct NX_CRYPTO_HKDF_STRUCT
{
/* Pointer to salt value for HKDF-extract operation. */
UCHAR *nx_crypto_hkdf_salt;
NX_CRYPTO_KEY_SIZE nx_crypto_hkdf_salt_length;
/* Pointer to Input Keying Material (IKM) for HKDF-extract. */
UCHAR *nx_crypto_hkdf_ikm;
UINT nx_crypto_hkdf_ikm_length;
/* Application-specific "info" used in the HKDF-expand operation. */
UCHAR *nx_crypto_hkdf_info;
UINT nx_crypto_hkdf_info_size;
/* Buffer to store Pseudo-Random Key (PRK) output from HKDF-extract.
The buffer must be as large as the largest HMAC hash output
(e.g. SHA-512 output length). */
UCHAR nx_crypto_hkdf_prk[64];
UINT nx_crypto_hkdf_prk_size; /* Actual output size (hash length). */
/* The HMAC method to use (generic HMAC wrapper). */
NX_CRYPTO_METHOD *nx_crypto_hmac_method;
/* The hash method to be used (e.g. SHA-256, SHA-384). */
NX_CRYPTO_METHOD *nx_crypto_hash_method;
/* Temporary space for HKDF-expand intermediary (T). It must be large enough
* to hold the previous T concatenated with "info" and a single octet counter.
* Length > 64 + 50 + 1. Must be 4-byte aligned for hmac metadata below. */
UCHAR nx_crypto_hkdf_temp_T[120];
/* Workspace for the HMAC operations. */
UCHAR nx_crypto_hmac_metadata[sizeof(NX_CRYPTO_SHA512_HMAC)];
/* Output from HMAC operations. */
UCHAR *nx_crypto_hmac_output;
UINT nx_crypto_hmac_output_size;
} NX_CRYPTO_HKDF;
extern NX_CRYPTO_METHOD crypto_method_hmac_md5;
extern NX_CRYPTO_METHOD crypto_method_hmac_sha1;
extern NX_CRYPTO_METHOD crypto_method_hmac_sha256;
extern NX_CRYPTO_METHOD crypto_method_hmac_sha384;
extern NX_CRYPTO_METHOD crypto_method_hmac_sha512;
UINT _nx_crypto_hkdf_extract(NX_CRYPTO_HKDF *hkdf);
UINT _nx_crypto_hkdf_expand(NX_CRYPTO_HKDF *hkdf, UCHAR *output, UINT desired_length);
/* Define the function prototypes for HKDF. */
UINT _nx_crypto_method_hkdf_init(struct NX_CRYPTO_METHOD_STRUCT *method,
UCHAR *key, NX_CRYPTO_KEY_SIZE key_size_in_bits,
VOID **handle,
VOID *crypto_metadata,
ULONG crypto_metadata_size);
UINT _nx_crypto_method_hkdf_cleanup(VOID *crypto_metadata);
UINT _nx_crypto_method_hkdf_operation(UINT op, /* Encrypt, Decrypt, Authenticate */
VOID *handle, /* Crypto handler */
struct NX_CRYPTO_METHOD_STRUCT *method,
UCHAR *key,
NX_CRYPTO_KEY_SIZE key_size_in_bits,
UCHAR *input,
ULONG input_length_in_byte,
UCHAR *iv_ptr,
UCHAR *output,
ULONG output_length_in_byte,
VOID *crypto_metadata,
ULONG crypto_metadata_size,
VOID *packet_ptr,
VOID (*nx_crypto_hw_process_callback)(VOID *packet_ptr, UINT status));
#ifdef __cplusplus
}
#endif
#endif
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