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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 Secure Component */
/** */
/** Transport Layer Security (TLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
#ifdef NX_SECURE_ENABLE_DTLS
#include "nx_secure_dtls.h"
#endif /* NX_SECURE_ENABLE_DTLS */
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
static UCHAR hash[64]; /* We concatenate MD5 and SHA-1 hashes into this buffer, OR SHA-256, SHA-384, SHA512. */
static UCHAR _nx_secure_padded_signature[512];
/* DER encodings (with OIDs for common algorithms) from RFC 8017.
* NOTE: This is the equivalent DER-encoding for the value "T" described in RFC 8017 section 9.2. */
static const UCHAR _NX_CRYPTO_DER_OID_MD5[] = {0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x02, 0x05, 0x00, 0x04, 0x10};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_1[] = {0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_224[] = {0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1c};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_256[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_384[] = {0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30};
static const UCHAR _NX_CRYPTO_DER_OID_SHA_512[] = {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40};
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_ecc_generate_keys PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is used to generate ECC key pairs (public, private) */
/* for use in TLS. TLS ECC keys need to be signed using a trusted */
/* certificate or other mechanism - this function handles the signature*/
/* generation and outputs the public key and it's signature in the */
/* proper over-the-wire format for TLS. The private key is also */
/* exported (conditionally) for later use (usually when used to */
/* calculate the shared secret. */
/* */
/* NOTE: The key sizes should contain the size of their respective */
/* buffers as input. The value will be replaced with the actual */
/* size of the generated key. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* ecc_named_curve IANA ECC curve identifier */
/* sign_key True/False generate signature */
/* public_key Signed ECC public key */
/* public_key_size Size of public key */
/* ecc_data ECC data (incl. private key) */
/* */
/* 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), update */
/* ECC find curve method, */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_ecc_generate_keys(NX_SECURE_TLS_SESSION *tls_session, UINT ecc_named_curve, USHORT sign_key,
UCHAR *public_key, UINT *public_key_size, NX_SECURE_TLS_ECDHE_HANDSHAKE_DATA *ecc_data)
{
UINT length;
UINT output_size;
UINT status;
NX_CRYPTO_EXTENDED_OUTPUT extended_output;
USHORT signature_length;
UINT signature_offset;
const UCHAR *der_encoding = NX_NULL;
UINT der_encoding_length = 0;
UINT hash_length;
const NX_CRYPTO_METHOD *curve_method;
const NX_CRYPTO_METHOD *curve_method_cert;
const NX_CRYPTO_METHOD *ecdhe_method;
const NX_CRYPTO_METHOD *hash_method;
const NX_CRYPTO_METHOD *auth_method;
VOID *handler = NX_NULL;
NX_SECURE_X509_CERT *certificate;
NX_SECURE_X509_CRYPTO *crypto_methods;
NX_SECURE_EC_PRIVATE_KEY *ec_privkey;
NX_SECURE_EC_PUBLIC_KEY *ec_pubkey;
USHORT signature_algorithm_id;
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if(tls_session->nx_secure_tls_1_3)
{
ecdhe_method = tls_session->nx_secure_tls_crypto_table->nx_secure_tls_ecdhe_method;
}
else
#endif
{
if (tls_session -> nx_secure_tls_session_ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
/* Generate ECDHE key pair using ECDHE crypto method. */
ecdhe_method = tls_session -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_public_cipher;
}
/* Make sure we have a method to use. */
if (ecdhe_method == NX_NULL || ecdhe_method -> nx_crypto_operation == NX_NULL)
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
/* Set the curve we are using. */
ecc_data->nx_secure_tls_ecdhe_named_curve = ecc_named_curve;
/* Find out which named curve the we are using. */
status = _nx_secure_tls_find_curve_method(tls_session, (USHORT)ecc_named_curve, &curve_method, NX_NULL);
if(status != NX_SUCCESS)
{
return(status);
}
if (curve_method == NX_NULL)
{
return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE);
}
if (ecdhe_method -> nx_crypto_init != NX_NULL)
{
status = ecdhe_method -> nx_crypto_init((NX_CRYPTO_METHOD*)ecdhe_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_SET, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
(UCHAR *)curve_method, sizeof(NX_CRYPTO_METHOD *), NX_NULL,
NX_NULL, 0,
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Start to fill the public key buffer. */
length = 0;
output_size = *public_key_size;
*public_key_size = 0;
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if(!tls_session->nx_secure_tls_1_3)
#endif
{
/* ECCurveType: named_curve (3). */
public_key[length] = 3;
length += 1;
/* NamedCurve */
public_key[length] = (UCHAR)((ecc_data -> nx_secure_tls_ecdhe_named_curve & 0xFF00) >> 8);
public_key[length + 1] = (UCHAR)(ecc_data -> nx_secure_tls_ecdhe_named_curve & 0x00FF);
length += 2;
}
/* Generate the key pair and output the public key. */
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if(tls_session->nx_secure_tls_1_3)
{
extended_output.nx_crypto_extended_output_data = &public_key[length];
extended_output.nx_crypto_extended_output_length_in_byte = output_size - length;
}
else
#endif
{
extended_output.nx_crypto_extended_output_data = &public_key[length + 1];
extended_output.nx_crypto_extended_output_length_in_byte = output_size - (length + 1);
}
extended_output.nx_crypto_extended_output_actual_size = 0;
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_DH_SETUP, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
NX_NULL, 0, NX_NULL,
(UCHAR *)&extended_output,
sizeof(extended_output),
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if(!tls_session->nx_secure_tls_1_3)
#endif
{
/* Put the length into the buffer before the key data. */
public_key[length] = (UCHAR)extended_output.nx_crypto_extended_output_actual_size;
length += 1;
}
length += (UINT)(extended_output.nx_crypto_extended_output_actual_size);
/* Export the private key for later use. */
extended_output.nx_crypto_extended_output_data = ecc_data -> nx_secure_tls_ecdhe_private_key;
extended_output.nx_crypto_extended_output_length_in_byte =
sizeof(ecc_data -> nx_secure_tls_ecdhe_private_key);
extended_output.nx_crypto_extended_output_actual_size = 0;
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_DH_PRIVATE_KEY_EXPORT, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
NX_NULL, 0, NX_NULL,
(UCHAR *)&extended_output,
sizeof(extended_output),
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Set the private key length. */
ecc_data -> nx_secure_tls_ecdhe_private_key_length = (USHORT)extended_output.nx_crypto_extended_output_actual_size;
/* Cleanup the ECC crypto state. */
if (ecdhe_method -> nx_crypto_cleanup)
{
status = ecdhe_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_cipher_metadata_area);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
/* If signing the key, generate the signature now using the local device certificate (if available). */
if(sign_key == NX_TRUE)
{
/* Get the local certificate. */
if (tls_session -> nx_secure_tls_credentials.nx_secure_tls_active_certificate != NX_NULL)
{
certificate = tls_session -> nx_secure_tls_credentials.nx_secure_tls_active_certificate;
}
else
{
/* Get reference to local device certificate. NX_NULL is passed for name to get default entry. */
status = _nx_secure_x509_local_device_certificate_get(&tls_session -> nx_secure_tls_credentials.nx_secure_tls_certificate_store,
NX_NULL, &certificate);
if (status != NX_SUCCESS)
{
certificate = NX_NULL;
}
}
if (certificate == NX_NULL)
{
/* No certificate found, error! */
return(NX_SECURE_TLS_CERTIFICATE_NOT_FOUND);
}
/* Find out the hash algorithm used for the signature. */
/* Map signature algorithm to internal ID. */
_nx_secure_tls_get_signature_algorithm_id((UINT)(ecc_data -> nx_secure_tls_ecdhe_signature_algorithm),
&signature_algorithm_id);
/* Get the crypto method. */
status = _nx_secure_x509_find_certificate_methods(certificate,
signature_algorithm_id,
&crypto_methods);
if (status)
{
return(NX_SECURE_TLS_UNSUPPORTED_SIGNATURE_ALGORITHM);
}
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0))
#else
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1))
#endif /* NX_SECURE_ENABLE_DTLS */
{
/* TLS 1.0 and TLS 1.1 use MD5 + SHA1 hash for RSA signatures. */
hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_md5_method;
}
else
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
hash_method = crypto_methods -> nx_secure_x509_hash_method;
}
hash_length = hash_method -> nx_crypto_ICV_size_in_bits >> 3;
/* Calculate the hash: SHA(ClientHello.random + ServerHello.random +
ServerKeyExchange.params); */
if (hash_method -> nx_crypto_init)
{
status = hash_method -> nx_crypto_init((NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (hash_method -> nx_crypto_operation != NX_NULL)
{
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
else
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_client_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_server_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
public_key,
length,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
hash,
hash_length,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (hash_method -> nx_crypto_cleanup)
{
status = hash_method -> nx_crypto_cleanup(tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
handler = NX_NULL;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0))
#else
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1))
#endif /* NX_SECURE_ENABLE_DTLS */
{
hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha1_method;;
/* Calculate the hash: SHA(ClientHello.random + ServerHello.random +
ServerKeyExchange.params); */
if (hash_method -> nx_crypto_init)
{
status = hash_method -> nx_crypto_init((NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (hash_method -> nx_crypto_operation != NX_NULL)
{
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
else
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_client_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_server_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
public_key,
length,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
&hash[16],
hash_method -> nx_crypto_ICV_size_in_bits >> 3,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (hash_method -> nx_crypto_cleanup)
{
status = hash_method -> nx_crypto_cleanup(tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
handler = NX_NULL;
}
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if (tls_session -> nx_secure_tls_protocol_version != NX_SECURE_TLS_VERSION_TLS_1_0 &&
tls_session -> nx_secure_tls_protocol_version != NX_SECURE_TLS_VERSION_TLS_1_1 &&
tls_session -> nx_secure_tls_protocol_version != NX_SECURE_DTLS_VERSION_1_0)
#else
if (tls_session -> nx_secure_tls_protocol_version != NX_SECURE_TLS_VERSION_TLS_1_0 &&
tls_session -> nx_secure_tls_protocol_version != NX_SECURE_TLS_VERSION_TLS_1_1)
#endif /* NX_SECURE_ENABLE_DTLS */
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
/* Signature Hash Algorithm. */
public_key[length] = (UCHAR)((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF00) >> 8);
public_key[length + 1] = (UCHAR)(ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0x00FF);
length += 2;
}
/* Sign the hash. */
auth_method = tls_session -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_public_auth;
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(auth_method -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_RSA ||
auth_method -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_RSA))
{
signature_length = certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length;
/* Signature Length */
public_key[length] = (UCHAR)((signature_length & 0xFF00) >> 8);
public_key[length + 1] = (UCHAR)(signature_length & 0x00FF);
length += 2;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0))
#else
if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1))
#endif /* NX_SECURE_ENABLE_DTLS */
{
hash_length += hash_method -> nx_crypto_ICV_size_in_bits >> 3;
der_encoding_length = 0;
}
else
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
switch ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF00) >> 8)
{
case NX_SECURE_TLS_HASH_ALGORITHM_MD5:
der_encoding = _NX_CRYPTO_DER_OID_MD5;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_MD5);
break;
case NX_SECURE_TLS_HASH_ALGORITHM_SHA1:
der_encoding = _NX_CRYPTO_DER_OID_SHA_1;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_1);
break;
case NX_SECURE_TLS_HASH_ALGORITHM_SHA224:
der_encoding = _NX_CRYPTO_DER_OID_SHA_224;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_224);
break;
case NX_SECURE_TLS_HASH_ALGORITHM_SHA256:
der_encoding = _NX_CRYPTO_DER_OID_SHA_256;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_256);
break;
case NX_SECURE_TLS_HASH_ALGORITHM_SHA384:
der_encoding = _NX_CRYPTO_DER_OID_SHA_384;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_384);
break;
case NX_SECURE_TLS_HASH_ALGORITHM_SHA512:
der_encoding = _NX_CRYPTO_DER_OID_SHA_512;
der_encoding_length = sizeof(_NX_CRYPTO_DER_OID_SHA_512);
break;
default:
return(NX_SECURE_TLS_UNSUPPORTED_SIGNATURE_ALGORITHM);
}
}
/* Build the RSA signature. */
/* C-STAT: If signature_length is ever exactly equal to (der_encoding_length + hash_length)
then signature_offset will be 0 and the (signature_offset - 1) expression below
would result in a negative array subscript. Thus, also check for equality in the
second condition (a zero-length signature offset). */
signature_offset = signature_length - (der_encoding_length + hash_length);
if ((signature_offset > sizeof(_nx_secure_padded_signature)) ||
(signature_length > sizeof(_nx_secure_padded_signature)) ||
(signature_offset == 0))
{
/* Buffer too small. */
return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
}
NX_CRYPTO_MEMSET(_nx_secure_padded_signature, 0xff, signature_offset);
_nx_secure_padded_signature[0] = 0x0;
_nx_secure_padded_signature[1] = 0x1;
_nx_secure_padded_signature[signature_offset - 1] = 0x0;
if (der_encoding_length > 0)
{
NX_CRYPTO_MEMCPY(&_nx_secure_padded_signature[signature_offset], der_encoding, der_encoding_length); /* Use case of memcpy is verified. */
signature_offset += der_encoding_length;
}
NX_CRYPTO_MEMCPY(&_nx_secure_padded_signature[signature_offset], hash, hash_length); /* Use case of memcpy is verified. */
if (auth_method -> nx_crypto_init != NX_NULL)
{
/* Initialize the crypto method with public key. */
status = auth_method -> nx_crypto_init((NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus,
(NX_CRYPTO_KEY_SIZE)(certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length << 3),
&handler,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (auth_method -> nx_crypto_operation != NX_NULL)
{
/* Sign the hash we just generated using our local RSA private key (associated with our local cert). */
status = auth_method -> nx_crypto_operation(NX_CRYPTO_DECRYPT,
handler,
(NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)certificate -> nx_secure_x509_private_key.rsa_private_key.nx_secure_rsa_private_exponent,
(NX_CRYPTO_KEY_SIZE)(certificate -> nx_secure_x509_private_key.rsa_private_key.nx_secure_rsa_private_exponent_length << 3),
_nx_secure_padded_signature,
signature_length,
NX_NULL,
&public_key[length],
signature_length,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
length += signature_length;
if (auth_method -> nx_crypto_cleanup)
{
status = auth_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_auth_metadata_area);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
}
else if ((ecc_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF) == NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA &&
auth_method -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_ECDSA)
{
ec_privkey = &certificate -> nx_secure_x509_private_key.ec_private_key;
ec_pubkey = &certificate -> nx_secure_x509_public_key.ec_public_key;
/* Find out which named curve the local certificate is using. */
status = _nx_secure_tls_find_curve_method(tls_session, (USHORT)(ec_privkey -> nx_secure_ec_named_curve), &curve_method_cert, NX_NULL);
if(status != NX_SUCCESS)
{
return(status);
}
if (curve_method_cert == NX_NULL)
{
/* The local certificate is using an unsupported curve. */
return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE);
}
if (auth_method -> nx_crypto_init != NX_NULL)
{
status = auth_method -> nx_crypto_init((NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)ec_pubkey -> nx_secure_ec_public_key,
(NX_CRYPTO_KEY_SIZE)(ec_pubkey -> nx_secure_ec_public_key_length << 3),
&handler,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (auth_method -> nx_crypto_operation == NX_NULL)
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = auth_method -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_SET, handler,
(NX_CRYPTO_METHOD*)auth_method, NX_NULL, 0,
(UCHAR *)curve_method_cert, sizeof(NX_CRYPTO_METHOD *), NX_NULL,
NX_NULL, 0,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Generate the signature and put it in the packet. */
extended_output.nx_crypto_extended_output_data = &public_key[length + 2];
extended_output.nx_crypto_extended_output_length_in_byte = output_size - length;
extended_output.nx_crypto_extended_output_actual_size = 0;
status = auth_method -> nx_crypto_operation(NX_CRYPTO_AUTHENTICATE, handler,
(NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)ec_privkey -> nx_secure_ec_private_key,
(NX_CRYPTO_KEY_SIZE)(ec_privkey -> nx_secure_ec_private_key_length << 3),
hash,
hash_method -> nx_crypto_ICV_size_in_bits >> 3, NX_NULL,
(UCHAR *)&extended_output,
sizeof(extended_output),
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (auth_method -> nx_crypto_cleanup)
{
status = auth_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_auth_metadata_area);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
/* Signature Length */
public_key[length] = (UCHAR)((extended_output.nx_crypto_extended_output_actual_size & 0xFF00) >> 8);
public_key[length + 1] = (UCHAR)(extended_output.nx_crypto_extended_output_actual_size & 0x00FF);
length += extended_output.nx_crypto_extended_output_actual_size + 2;
}
else
{
/* The signature algorithm is not supported. */
*public_key_size = 0;
return(NX_SECURE_TLS_UNSUPPORTED_SIGNATURE_ALGORITHM);
}
}
/* Return the length of our generated data. */
*public_key_size = length;
return(NX_SUCCESS);
}
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
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