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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 */
/** */
/** Elliptic-curve Diffie-Hellman (ECDH) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_CRYPTO_SOURCE_CODE
/* Include necessary system files. */
#include "nx_crypto_ecdh.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ecdh_key_pair_import PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets up a Elliptic-curve Diffie-Hellman context by */
/* importing a local key pair. */
/* */
/* INPUT */
/* */
/* ecdh_ptr ECDH context */
/* curve Elliptic Curve */
/* local_private_key_ptr Pointer to local private key */
/* local_private_key_len Local private key length */
/* local_public_key_ptr Pointer to local public key */
/* local_public_key_len Remote public key length */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ecdh_key_pair_import(NX_CRYPTO_ECDH *ecdh_ptr,
NX_CRYPTO_EC *curve,
UCHAR *local_private_key_ptr,
ULONG local_private_key_len,
UCHAR *local_public_key_ptr,
ULONG local_public_key_len)
{
UINT public_key_len;
NX_CRYPTO_HUGE_NUMBER private_key;
NX_CRYPTO_PARAMETER_NOT_USED(local_public_key_ptr);
if (local_private_key_len > sizeof(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer))
{
return(NX_CRYPTO_SIZE_ERROR);
}
public_key_len = 1 + (((curve -> nx_crypto_ec_bits + 7) >> 3) << 1);
if (local_public_key_len > public_key_len)
{
return(NX_CRYPTO_SIZE_ERROR);
}
/* Assign the desired key size based on the chosen elliptic curve. */
ecdh_ptr -> nx_crypto_ecdh_key_size = curve -> nx_crypto_ec_n.nx_crypto_huge_buffer_size;
/* Clear the private key buffer. */
NX_CRYPTO_MEMSET(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer, 0,
sizeof(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer));
/* Setup the private key. */
private_key.nx_crypto_huge_number_data = ecdh_ptr -> nx_crypto_ecdh_private_key_buffer;
private_key.nx_crypto_huge_buffer_size = sizeof(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer);
_nx_crypto_huge_number_setup(&private_key, local_private_key_ptr, local_private_key_len);
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ecdh_private_key_export PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function exports the local private key in Elliptic-curve */
/* Diffie-Hellman context. */
/* */
/* INPUT */
/* */
/* ecdh_ptr ECDH context */
/* local_private_key_ptr Pointer to local private key */
/* local_private_key_len Local private key length */
/* actual_local_private_key_len Pointer to private key length */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _nx_crypto_ecdh_private_key_export(NX_CRYPTO_ECDH *ecdh_ptr,
UCHAR *local_private_key_ptr,
ULONG local_private_key_len,
ULONG *actual_local_private_key_len)
{
UINT status;
UINT key_size;
UINT clen;
NX_CRYPTO_EC *curve;
NX_CRYPTO_HUGE_NUMBER private_key;
/* Make sure the key size was assigned before we do anything else. Generally, this means
_nx_crypto_ecdh_setup was not called to set up the NX_CRYPTO_ECDH structure prior to this call. */
if (0 == ecdh_ptr -> nx_crypto_ecdh_key_size)
{
return(NX_CRYPTO_SIZE_ERROR);
}
curve = ecdh_ptr -> nx_crypto_ecdh_curve;
/* Figure out the sizes of our keys and buffers. */
key_size = ecdh_ptr -> nx_crypto_ecdh_key_size;
/* Check to make sure the buffer is large enough to hold the private key. */
clen = (curve -> nx_crypto_ec_bits + 7) >> 3;
if (local_private_key_len < clen)
{
return(NX_CRYPTO_SIZE_ERROR);
}
/* Private key buffer - note that no scratch is required for the private key, but we set it in case
it is needed in the future. */
private_key.nx_crypto_huge_number_data = (HN_UBASE *)ecdh_ptr -> nx_crypto_ecdh_private_key_buffer;
private_key.nx_crypto_huge_number_size = key_size >> HN_SIZE_SHIFT;
private_key.nx_crypto_huge_buffer_size = key_size;
private_key.nx_crypto_huge_number_is_negative = NX_CRYPTO_FALSE;
/* Copy the private key into the return buffer. */
status = _nx_crypto_huge_number_extract_fixed_size(&private_key,
local_private_key_ptr, clen);
*actual_local_private_key_len = clen;
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ecdh_setup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets up a Elliptic-curve Diffie-Hellman context by */
/* generating a local key pair. */
/* */
/* INPUT */
/* */
/* ecdh_ptr ECDH context */
/* share_secret_key_ptr Shared secret buffer pointer */
/* share_secret_key_len_ptr Length of shared secret */
/* local_public_key_ptr Pointer to local public key */
/* local_public_key_len Remote public key length */
/* scratch_buf_ptr Pointer to scratch buffer, */
/* which cannot be smaller */
/* than 6 times of the key */
/* size (in bytes). This */
/* scratch buffer can be */
/* reused after this function */
/* returns. */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_crypto_ec_key_pair_generation_extra */
/* Generate EC Key Pair */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ecdh_setup(NX_CRYPTO_ECDH *ecdh_ptr,
UCHAR *local_public_key_ptr,
ULONG local_public_key_len,
ULONG *actual_local_public_key_len,
NX_CRYPTO_EC *curve,
HN_UBASE *scratch_buf_ptr)
{
UINT public_key_len;
/* Actual huge numbers used in calculations */
NX_CRYPTO_HUGE_NUMBER private_key;
NX_CRYPTO_EC_POINT public_key;
public_key_len = 1 + (((curve -> nx_crypto_ec_bits + 7) >> 3) << 1);
if (local_public_key_len < public_key_len)
{
return(NX_CRYPTO_SIZE_ERROR);
}
ecdh_ptr -> nx_crypto_ecdh_curve = curve;
/* Assign the desired key size based on the chosen elliptic curve. */
ecdh_ptr -> nx_crypto_ecdh_key_size = curve -> nx_crypto_ec_n.nx_crypto_huge_buffer_size;
/* Public key buffer (and scratch). */
NX_CRYPTO_EC_POINT_INITIALIZE(&public_key, NX_CRYPTO_EC_POINT_AFFINE, scratch_buf_ptr,
ecdh_ptr -> nx_crypto_ecdh_key_size);
/* Private key buffer - note that no scratch is required for the private key. */
private_key.nx_crypto_huge_number_data = ecdh_ptr -> nx_crypto_ecdh_private_key_buffer;
private_key.nx_crypto_huge_number_size = ecdh_ptr -> nx_crypto_ecdh_key_size >> HN_SIZE_SHIFT;
private_key.nx_crypto_huge_buffer_size = sizeof(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer);
private_key.nx_crypto_huge_number_is_negative = NX_CRYPTO_FALSE;
/* Clear the private key buffer. */
NX_CRYPTO_MEMSET(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer, 0,
sizeof(ecdh_ptr -> nx_crypto_ecdh_private_key_buffer));
/* Generate Key Pair. */
_nx_crypto_ec_key_pair_generation_extra(curve, &curve -> nx_crypto_ec_g, &private_key,
&public_key, scratch_buf_ptr);
/* Copy the public key into the return buffer. */
_nx_crypto_ec_point_extract_uncompressed(curve, &public_key, local_public_key_ptr,
local_public_key_len, &public_key_len);
if (public_key_len == 0)
{
return(NX_CRYPTO_SIZE_ERROR);
}
*actual_local_public_key_len = public_key_len;
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ecdh_compute_secret PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function computes the Elliptic-curve Diffie-Hellman shared */
/* secret using an existing Elliptic-curve Diffie-Hellman context */
/* and a public key received from a remote entity. */
/* */
/* INPUT */
/* */
/* ecdh_ptr ECDH context */
/* share_secret_key_ptr Shared secret buffer pointer */
/* share_secret_key_len_ptr Length of shared secret */
/* remote_public_key Pointer to remote public key */
/* remote_public_key_len Remote public key length */
/* scratch_buf_ptr Pointer to scratch buffer, */
/* which cannot be smaller */
/* than 8 times of the key */
/* size (in bytes). This */
/* scratch buffer can be */
/* reused after this function */
/* returns. */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_crypto_huge_number_extract Extract huge number */
/* _nx_crypto_huge_number_setup Setup huge number */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), and */
/* added public key validation,*/
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ecdh_compute_secret(NX_CRYPTO_ECDH *ecdh_ptr,
UCHAR *share_secret_key_ptr,
ULONG share_secret_key_len_ptr,
ULONG *actual_share_secret_key_len,
UCHAR *remote_public_key,
ULONG remote_public_key_len,
HN_UBASE *scratch_buf_ptr)
{
UINT status;
UINT key_size;
UINT clen;
NX_CRYPTO_EC *curve;
/* Actual huge numbers used in calculations */
NX_CRYPTO_HUGE_NUMBER private_key;
NX_CRYPTO_EC_POINT public_key, shared_secret;
/* Make sure the key size was assigned before we do anything else. Generally, this means
_nx_crypto_ecdh_setup was not called to set up the NX_CRYPTO_ECDH structure prior to this call. */
if (0 == ecdh_ptr -> nx_crypto_ecdh_key_size)
{
return(NX_CRYPTO_SIZE_ERROR);
}
curve = ecdh_ptr -> nx_crypto_ecdh_curve;
/* Figure out the sizes of our keys and buffers. We need 4X the key size for our buffer space. */
key_size = ecdh_ptr -> nx_crypto_ecdh_key_size;
/* Make sure the remote public key is small enough to fit into the huge number buffer. */
if (remote_public_key_len > 1 + 2 * key_size)
{
return(NX_CRYPTO_SIZE_ERROR);
}
/* Check to make sure the buffer is large enough to hold the shared secret key. */
clen = (curve -> nx_crypto_ec_bits + 7) >> 3;
if (share_secret_key_len_ptr < clen)
{
return(NX_CRYPTO_SIZE_ERROR);
}
NX_CRYPTO_EC_POINT_INITIALIZE(&public_key, NX_CRYPTO_EC_POINT_AFFINE, scratch_buf_ptr, key_size);
NX_CRYPTO_EC_POINT_INITIALIZE(&shared_secret, NX_CRYPTO_EC_POINT_AFFINE, scratch_buf_ptr, key_size);
/* Copy the remote public key from the caller's buffer. */
status = _nx_crypto_ec_point_setup(&public_key, remote_public_key, remote_public_key_len);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
#ifndef NX_CRYPTO_ECC_DISABLE_KEY_VALIDATION
status = _nx_crypto_ec_validate_public_key(&public_key, curve, NX_CRYPTO_TRUE, scratch_buf_ptr);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
#endif /* NX_CRYPTO_ECC_DISABLE_KEY_VALIDATION */
/* Private key buffer - note that no scratch is required for the private key, but we set it in case
it is needed in the future. */
private_key.nx_crypto_huge_number_data = (HN_UBASE *)ecdh_ptr -> nx_crypto_ecdh_private_key_buffer;
private_key.nx_crypto_huge_number_size = key_size >> HN_SIZE_SHIFT;
private_key.nx_crypto_huge_buffer_size = key_size;
private_key.nx_crypto_huge_number_is_negative = NX_CRYPTO_FALSE;
/* Finally, generate shared secret from the remote public key, our generated private key, and the curve.
The actual calculation is "shared_secret = private_key * public_key". */
curve -> nx_crypto_ec_multiple(curve, &public_key, &private_key, &shared_secret, scratch_buf_ptr);
/* The public key size is simply the key size for this group. */
/* Copy the shared secret into the return buffer. */
status = _nx_crypto_huge_number_extract_fixed_size(&shared_secret.nx_crypto_ec_point_x,
share_secret_key_ptr, clen);
*actual_share_secret_key_len = clen;
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_ecdh_init PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the common crypto method init callback for */
/* Microsoft supported ECDH cryptographic algorithm. */
/* */
/* INPUT */
/* */
/* method Pointer to crypto method */
/* key Pointer to key */
/* key_size_in_bits Length of key size in bits */
/* handler Returned crypto handler */
/* crypto_metadata Metadata area */
/* crypto_metadata_size Size of the metadata area */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_ecdh_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)
{
NX_CRYPTO_STATE_CHECK
NX_CRYPTO_PARAMETER_NOT_USED(key);
NX_CRYPTO_PARAMETER_NOT_USED(key_size_in_bits);
NX_CRYPTO_PARAMETER_NOT_USED(handle);
if ((method == NX_CRYPTO_NULL) || (crypto_metadata == NX_CRYPTO_NULL))
{
return(NX_CRYPTO_PTR_ERROR);
}
/* Verify the metadata addrsss is 4-byte aligned. */
if((((ULONG)crypto_metadata) & 0x3) != 0)
{
return(NX_CRYPTO_PTR_ERROR);
}
if(crypto_metadata_size < sizeof(NX_CRYPTO_ECDH))
{
return(NX_CRYPTO_PTR_ERROR);
}
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_ecdh_cleanup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function cleans up the crypto metadata. */
/* */
/* INPUT */
/* */
/* crypto_metadata Crypto metadata */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* NX_CRYPTO_MEMSET Set the memory */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_ecdh_cleanup(VOID *crypto_metadata)
{
NX_CRYPTO_STATE_CHECK
#ifdef NX_SECURE_KEY_CLEAR
if (!crypto_metadata)
return (NX_CRYPTO_SUCCESS);
/* Clean up the crypto metadata. */
NX_CRYPTO_MEMSET(crypto_metadata, 0, sizeof(NX_CRYPTO_ECDH));
#else
NX_CRYPTO_PARAMETER_NOT_USED(crypto_metadata);
#endif/* NX_SECURE_KEY_CLEAR */
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_method_ecdh_operation PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs an ECDH operation. */
/* */
/* INPUT */
/* */
/* op ECDH operation */
/* handle Crypto handle */
/* method Cryption Method Object */
/* key Encryption Key */
/* key_size_in_bits Key size in bits */
/* input Input data */
/* input_length_in_byte Input data size */
/* iv_ptr Initial vector */
/* output Output buffer */
/* output_length_in_byte Output buffer size */
/* crypto_metadata Metadata area */
/* crypto_metadata_size Metadata area size */
/* packet_ptr Pointer to packet */
/* nx_crypto_hw_process_callback Callback function pointer */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_crypto_ecdh_setup Setup local key pair */
/* _nx_crypto_ecdh_compute_secret Compute shared secret */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_method_ecdh_operation(UINT op,
VOID *handle,
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 *, UINT))
{
NX_CRYPTO_ECDH *ecdh;
UINT status = NX_CRYPTO_SUCCESS;
NX_CRYPTO_EXTENDED_OUTPUT
*extended_output;
NX_CRYPTO_PARAMETER_NOT_USED(handle);
NX_CRYPTO_PARAMETER_NOT_USED(iv_ptr);
NX_CRYPTO_PARAMETER_NOT_USED(output_length_in_byte);
NX_CRYPTO_PARAMETER_NOT_USED(packet_ptr);
NX_CRYPTO_PARAMETER_NOT_USED(nx_crypto_hw_process_callback);
NX_CRYPTO_STATE_CHECK
/* Verify the metadata addrsss is 4-byte aligned. */
if((method == NX_CRYPTO_NULL) || (crypto_metadata == NX_CRYPTO_NULL) || ((((ULONG)crypto_metadata) & 0x3) != 0))
{
return(NX_CRYPTO_PTR_ERROR);
}
if(crypto_metadata_size < sizeof(NX_CRYPTO_ECDH))
{
return(NX_CRYPTO_PTR_ERROR);
}
ecdh = (NX_CRYPTO_ECDH *)crypto_metadata;
if (op == NX_CRYPTO_EC_CURVE_SET)
{
/* Set curve to be used in the ECDH. */
status = ((NX_CRYPTO_METHOD *)input) -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_GET,
NX_CRYPTO_NULL,
(NX_CRYPTO_METHOD *)input,
NX_CRYPTO_NULL, 0,
NX_CRYPTO_NULL, 0,
NX_CRYPTO_NULL,
(UCHAR *)&ecdh -> nx_crypto_ecdh_curve,
sizeof(NX_CRYPTO_EC *),
NX_CRYPTO_NULL, 0,
NX_CRYPTO_NULL, NX_CRYPTO_NULL);
}
else if (op == NX_CRYPTO_EC_KEY_PAIR_GENERATE)
{
if (ecdh -> nx_crypto_ecdh_curve == NX_CRYPTO_NULL)
{
return(NX_CRYPTO_PTR_ERROR);
}
extended_output = (NX_CRYPTO_EXTENDED_OUTPUT *)output;
status = _nx_crypto_ec_key_pair_stream_generate(ecdh -> nx_crypto_ecdh_curve,
extended_output -> nx_crypto_extended_output_data,
extended_output -> nx_crypto_extended_output_length_in_byte,
&extended_output -> nx_crypto_extended_output_actual_size,
ecdh -> nx_crypto_ecdh_scratch_buffer);
}
else if (op == NX_CRYPTO_DH_SETUP)
{
/* Setup local key pair. */
extended_output = (NX_CRYPTO_EXTENDED_OUTPUT *)output;
status = _nx_crypto_ecdh_setup(ecdh,
extended_output -> nx_crypto_extended_output_data,
extended_output -> nx_crypto_extended_output_length_in_byte,
&extended_output -> nx_crypto_extended_output_actual_size,
ecdh -> nx_crypto_ecdh_curve,
ecdh -> nx_crypto_ecdh_scratch_buffer);
}
else if (op == NX_CRYPTO_DH_KEY_PAIR_IMPORT)
{
if (key == NX_CRYPTO_NULL)
{
return(NX_CRYPTO_PTR_ERROR);
}
/* Import local key pair. */
status = _nx_crypto_ecdh_key_pair_import(ecdh, ecdh -> nx_crypto_ecdh_curve,
key, (key_size_in_bits >> 3),
input, input_length_in_byte);
}
else if (op == NX_CRYPTO_DH_PRIVATE_KEY_EXPORT)
{
/* Export local private key. */
extended_output = (NX_CRYPTO_EXTENDED_OUTPUT *)output;
status = _nx_crypto_ecdh_private_key_export(ecdh,
extended_output -> nx_crypto_extended_output_data,
extended_output -> nx_crypto_extended_output_length_in_byte,
&extended_output -> nx_crypto_extended_output_actual_size);
}
else if (op == NX_CRYPTO_DH_CALCULATE)
{
/* Compute shared secret. */
extended_output = (NX_CRYPTO_EXTENDED_OUTPUT *)output;
status = _nx_crypto_ecdh_compute_secret(ecdh,
extended_output -> nx_crypto_extended_output_data,
extended_output -> nx_crypto_extended_output_length_in_byte,
&extended_output -> nx_crypto_extended_output_actual_size,
input,
input_length_in_byte,
ecdh -> nx_crypto_ecdh_scratch_buffer);
}
else
{
status = NX_CRYPTO_NOT_SUCCESSFUL;
}
return(status);
}