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feat(psa): add delegated attestation partition API
Delegated attestation is a service provided by RSS to: - Derive a delegated attestation key: Realm Attestation Key - Query the platform attestation token Signed-off-by: Tamas Ban <tamas.ban@arm.com> Change-Id: I3edf09fcbef24bca7c8a000ffac8c1ab64dfb812
This commit is contained in:
Tamas Ban
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3 changed files with 342 additions and 0 deletions
109
include/lib/psa/delegated_attestation.h
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109
include/lib/psa/delegated_attestation.h
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@ -0,0 +1,109 @@
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/*
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* Copyright (c) 2022, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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/* This file describes the Delegated Attestation API */
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#ifndef DELEGATED_ATTESTATION_H
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#define DELEGATED_ATTESTATION_H
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#include <stddef.h>
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#include <stdint.h>
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#include "psa/error.h"
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/* RSS Delegated Attestation message types that distinguish its services. */
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#define RSS_DELEGATED_ATTEST_GET_DELEGATED_KEY 1001U
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#define RSS_DELEGATED_ATTEST_GET_PLATFORM_TOKEN 1002U
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/**
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* The aim of these APIs to get a derived signing key (private only) for the
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* delegated attestation model and obtain the corresponding platform attestation
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* token. In the delegated attestation model the final token consist of more
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* than one subtokens which are signed by different entities. There is a
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* cryptographical binding between the tokens. The derived delegated attestation
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* key is bind to the platform token (details below).
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*
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* Expected usage model:
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* - First rss_delegated_attest_get_delegated_key() API need to be called to
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* obtain the private part of the delegated attestation key. The public part
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* of key is computed by the cryptographic library when the key is
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* registered.
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* - Secondly the rss_delegated_attest_get_token() must be called to obtain
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* platform attestation token. The hash of the public key (computed by
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* the hash_algo indicated in the rss_delegated_attest_get_delegated_key()
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* call) must be the input of this call. This ensures that nothing but the
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* previously derived delegated key is bindable to the platform token.
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*/
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/**
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* Get a delegated attestation key (DAK).
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*
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* The aim of the delegated attestation key is to enable other SW components
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* within the system to sign an attestation token which is different than the
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* initial/platform token. The initial attestation token MUST contain the hash
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* of the public delegated key to make a cryptographical binding (hash lock)
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* between the key and the token.
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* The initial attestation token has two roles in this scenario:
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* - Attest the device boot status and security lifecycle.
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* - Attest the delegated attestation key.
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* The delegated attestation key is derived from a preprovisioned seed. The
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* input for the key derivation is the platform boot status. The system can be
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* attestated with the two tokens together.
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*
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* ecc_curve The type of the elliptic curve to which the requested
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* attestation key belongs. Please check the note section for
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* limitations.
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* key_bits The size of the requested attestation key, in bits.
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* key_buf Pointer to the buffer where the delegated attestation key will
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* be stored.
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* key_buf_size Size of allocated buffer for the key, in bytes.
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* key_size Size of the key that has been returned, in bytes.
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* hash_algo The hash algorithm that will be used later by the owner of the
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* requested delegated key for binding it to the platform
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* attestation token.
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*
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* Returns error code as specified in psa_status_t.
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*
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* Notes:
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* - Currently, only the PSA_ECC_FAMILY_SECP_R1 curve type is supported.
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* - The delegated attestation key must be derived before requesting for the
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* platform attestation token as they are cryptographically linked together.
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*/
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psa_status_t
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rss_delegated_attest_get_delegated_key(uint8_t ecc_curve,
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uint32_t key_bits,
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uint8_t *key_buf,
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size_t key_buf_size,
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size_t *key_size,
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uint32_t hash_algo);
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/**
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* Get platform attestation token
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*
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* dak_pub_hash Pointer to buffer where the hash of the public DAK is
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* stored.
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* dak_pub_hash_size Size of the hash value, in bytes.
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* token_buf Pointer to the buffer where the platform attestation token
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* will be stored.
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* token_buf_size Size of allocated buffer for token, in bytes.
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* token_size Size of the token that has been returned, in bytes.
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*
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* Returns error code as specified in psa_status_t.
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*
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* A delegated attestation key must be derived before requesting for the
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* platform attestation token as they are cryptographically linked together.
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* Otherwise, the token request will fail and the PSA_ERROR_INVALID_ARGUMENT
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* code will be returned.
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*/
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psa_status_t
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rss_delegated_attest_get_token(const uint8_t *dak_pub_hash,
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size_t dak_pub_hash_size,
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uint8_t *token_buf,
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size_t token_buf_size,
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size_t *token_size);
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#endif /* DELEGATED_ATTESTATION_H */
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@ -14,4 +14,7 @@
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/******** PSA_SP_MEASURED_BOOT ********/
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#define RSS_MEASURED_BOOT_HANDLE (0x40000110U)
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/******** PSA_SP_DELAGATED_ATTESTATION ********/
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#define RSS_DELEGATED_SERVICE_HANDLE (0x40000111U)
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#endif /* PSA_MANIFEST_SID_H */
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230
lib/psa/delegated_attestation.c
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230
lib/psa/delegated_attestation.c
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/*
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* Copyright (c) 2022, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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#include <string.h>
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#include <delegated_attestation.h>
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#include <psa/client.h>
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#include <psa_manifest/sid.h>
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#if !PLAT_RSS_NOT_SUPPORTED
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psa_status_t
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rss_delegated_attest_get_delegated_key(uint8_t ecc_curve,
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uint32_t key_bits,
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uint8_t *key_buf,
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size_t key_buf_size,
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size_t *key_size,
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uint32_t hash_algo)
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{
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psa_status_t status;
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psa_invec in_vec[] = {
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{&ecc_curve, sizeof(ecc_curve)},
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{&key_bits, sizeof(key_bits)},
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{&hash_algo, sizeof(hash_algo)}
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};
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psa_outvec out_vec[] = {
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{key_buf, key_buf_size}
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};
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if (key_size == NULL) {
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return PSA_ERROR_INVALID_ARGUMENT;
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}
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status = psa_call(RSS_DELEGATED_SERVICE_HANDLE,
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RSS_DELEGATED_ATTEST_GET_DELEGATED_KEY,
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in_vec, IOVEC_LEN(in_vec),
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out_vec, IOVEC_LEN(out_vec));
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if (status == PSA_SUCCESS) {
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*key_size = out_vec[0].len;
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}
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return status;
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}
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psa_status_t
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rss_delegated_attest_get_token(const uint8_t *dak_pub_hash,
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size_t dak_pub_hash_size,
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uint8_t *token_buf,
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size_t token_buf_size,
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size_t *token_size)
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{
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psa_status_t status;
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psa_invec in_vec[] = {
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{dak_pub_hash, dak_pub_hash_size}
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};
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psa_outvec out_vec[] = {
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{token_buf, token_buf_size}
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};
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if (token_size == NULL) {
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return PSA_ERROR_INVALID_ARGUMENT;
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}
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status = psa_call(RSS_DELEGATED_SERVICE_HANDLE,
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RSS_DELEGATED_ATTEST_GET_PLATFORM_TOKEN,
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in_vec, IOVEC_LEN(in_vec),
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out_vec, IOVEC_LEN(out_vec));
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if (status == PSA_SUCCESS) {
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*token_size = out_vec[0].len;
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}
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return status;
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}
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#else /* !PLAT_RSS_NOT_SUPPORTED */
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static const uint8_t delegated_key[] = {
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0x20, 0x11, 0xC7, 0xF0, 0x3C, 0xEE, 0x43, 0x25, 0x17, 0x6E,
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0x52, 0x4F, 0x03, 0x3C, 0x0C, 0xE1, 0xE2, 0x1A, 0x76, 0xE6,
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0xC1, 0xA4, 0xF0, 0xB8, 0x39, 0xAA, 0x1D, 0xF6, 0x1E, 0x0E,
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0x8A, 0x5C, 0x8A, 0x05, 0x74, 0x0F, 0x9B, 0x69, 0xEF, 0xA7,
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0xEB, 0x1A, 0x41, 0x85, 0xBD, 0x11, 0x7F, 0x68
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}
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static const uint8_t platform_token[] = {
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0xD2, 0x84, 0x43, 0xA1, 0x01, 0x26, 0xA0, 0x59,
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0x02, 0xBE, 0xAA, 0x3A, 0x00, 0x01, 0x24, 0xFF,
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0x58, 0x20, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB,
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0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB,
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0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB,
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0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB, 0xAB,
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0xAB, 0xAB, 0x3A, 0x00, 0x01, 0x24, 0xFB, 0x58,
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0x20, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
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0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE,
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0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
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0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
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0xBF, 0x3A, 0x00, 0x01, 0x25, 0x00, 0x58, 0x21,
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0x01, 0xFA, 0x58, 0x75, 0x5F, 0x65, 0x86, 0x27,
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0xCE, 0x54, 0x60, 0xF2, 0x9B, 0x75, 0x29, 0x67,
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0x13, 0x24, 0x8C, 0xAE, 0x7A, 0xD9, 0xE2, 0x98,
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0x4B, 0x90, 0x28, 0x0E, 0xFC, 0xBC, 0xB5, 0x02,
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0x48, 0x3A, 0x00, 0x01, 0x24, 0xFA, 0x58, 0x20,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
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0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xBB,
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0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0x3A, 0x00, 0x01, 0x24, 0xF8, 0x20, 0x3A, 0x00,
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0x01, 0x24, 0xF9, 0x00, 0x3A, 0x00, 0x01, 0x24,
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0xFD, 0x85, 0xA5, 0x05, 0x58, 0x20, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x60,
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0x01, 0x65, 0x42, 0x4C, 0x31, 0x5F, 0x32, 0x06,
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0x66, 0x53, 0x48, 0x41, 0x32, 0x35, 0x36, 0x02,
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0x58, 0x20, 0xF8, 0xB7, 0xCE, 0xAD, 0x9B, 0xE4,
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0x5A, 0x8F, 0x5C, 0x52, 0x6F, 0x0C, 0x05, 0x25,
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0x8F, 0xF3, 0xE9, 0x81, 0xDC, 0xBC, 0xF2, 0x05,
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0x7F, 0x33, 0xF6, 0xBB, 0xDC, 0xD9, 0x4D, 0xA2,
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0x34, 0x3A, 0xA5, 0x05, 0x58, 0x20, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x67,
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0x31, 0x2E, 0x37, 0x2E, 0x32, 0x2B, 0x30, 0x01,
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0x63, 0x42, 0x4C, 0x32, 0x06, 0x66, 0x53, 0x48,
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0x41, 0x32, 0x35, 0x36, 0x02, 0x58, 0x20, 0x3A,
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0xE5, 0x9E, 0x40, 0xA9, 0x6B, 0xD5, 0x29, 0x1C,
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0xAB, 0x7A, 0x5F, 0xBD, 0x1F, 0x9A, 0xA6, 0x52,
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0xFB, 0x77, 0x7D, 0xA3, 0xEC, 0x9C, 0x29, 0xBC,
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0xE6, 0x5B, 0x3B, 0x43, 0xFC, 0x9D, 0x26, 0xA5,
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0x05, 0x58, 0x20, 0xBF, 0xE6, 0xD8, 0x6F, 0x88,
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0x26, 0xF4, 0xFF, 0x97, 0xFB, 0x96, 0xC4, 0xE6,
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0xFB, 0xC4, 0x99, 0x3E, 0x46, 0x19, 0xFC, 0x56,
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0x5D, 0xA2, 0x6A, 0xDF, 0x34, 0xC3, 0x29, 0x48,
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0x9A, 0xDC, 0x38, 0x04, 0x67, 0x31, 0x2E, 0x35,
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0x2E, 0x30, 0x2B, 0x30, 0x01, 0x64, 0x52, 0x54,
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0x5F, 0x30, 0x06, 0x66, 0x53, 0x48, 0x41, 0x32,
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0x35, 0x36, 0x02, 0x58, 0x20, 0x47, 0x94, 0x9D,
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0x27, 0x33, 0x82, 0x45, 0x1A, 0xDD, 0x25, 0xF4,
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0x9A, 0x89, 0x6F, 0x5F, 0xD9, 0xB0, 0xE8, 0x14,
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0xD3, 0xA4, 0x9B, 0x53, 0xB0, 0x44, 0x0B, 0xCF,
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0x32, 0x1A, 0xC4, 0xD2, 0x65, 0xA5, 0x05, 0x58,
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0x20, 0xB3, 0x60, 0xCA, 0xF5, 0xC9, 0x8C, 0x6B,
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0x94, 0x2A, 0x48, 0x82, 0xFA, 0x9D, 0x48, 0x23,
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0xEF, 0xB1, 0x66, 0xA9, 0xEF, 0x6A, 0x6E, 0x4A,
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0xA3, 0x7C, 0x19, 0x19, 0xED, 0x1F, 0xCC, 0xC0,
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0x49, 0x04, 0x67, 0x30, 0x2E, 0x30, 0x2E, 0x37,
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0x2B, 0x30, 0x01, 0x64, 0x52, 0x54, 0x5F, 0x31,
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0x06, 0x66, 0x53, 0x48, 0x41, 0x32, 0x35, 0x36,
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0x02, 0x58, 0x20, 0xCD, 0x38, 0xBE, 0xC8, 0xB7,
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0xC0, 0x9E, 0xD5, 0x24, 0x30, 0xFE, 0xC8, 0xD0,
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0x19, 0x12, 0x56, 0xB2, 0x7A, 0xA5, 0x53, 0x6F,
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0xBC, 0x7D, 0x09, 0xCA, 0x11, 0xDD, 0x90, 0xD7,
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0xD6, 0x70, 0xFD, 0xA5, 0x05, 0x58, 0x20, 0xAA,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0x04,
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0x60, 0x01, 0x60, 0x06, 0x66, 0x53, 0x48, 0x41,
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0x32, 0x35, 0x36, 0x02, 0x58, 0x20, 0x28, 0x3D,
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0x0C, 0x25, 0x22, 0x0C, 0x87, 0x46, 0xA0, 0x58,
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0x64, 0x6C, 0x0B, 0x14, 0x37, 0x39, 0x40, 0x9D,
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0x2D, 0x11, 0xD1, 0xCC, 0x54, 0x51, 0xB4, 0x29,
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0x22, 0xCD, 0x70, 0x92, 0x71, 0xC3, 0x3A, 0x00,
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0x01, 0x25, 0x01, 0x77, 0x77, 0x77, 0x77, 0x2E,
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0x74, 0x72, 0x75, 0x73, 0x74, 0x65, 0x64, 0x66,
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0x69, 0x72, 0x6D, 0x77, 0x61, 0x72, 0x65, 0x2E,
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0x6F, 0x72, 0x67, 0x3A, 0x00, 0x01, 0x24, 0xF7,
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0x71, 0x50, 0x53, 0x41, 0x5F, 0x49, 0x4F, 0x54,
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0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45,
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0x5F, 0x31, 0x3A, 0x00, 0x01, 0x24, 0xFC, 0x70,
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0x30, 0x36, 0x30, 0x34, 0x35, 0x36, 0x35, 0x32,
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0x37, 0x32, 0x38, 0x32, 0x39, 0x31, 0x30, 0x30,
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0x58, 0x40, 0x1E, 0x0D, 0x2B, 0xD8, 0x7A, 0xC9,
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0x2D, 0xCB, 0x73, 0xD1, 0x42, 0x2F, 0xBF, 0xDA,
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0x24, 0x71, 0xE2, 0xAF, 0xEA, 0x48, 0x60, 0x17,
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0x23, 0x75, 0x64, 0xAC, 0xCC, 0x23, 0xA2, 0x67,
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0xC4, 0xE7, 0x8F, 0x1C, 0x7C, 0x68, 0x49, 0x42,
|
||||
0x4D, 0xDA, 0xC6, 0xD6, 0x21, 0x1C, 0xAA, 0x00,
|
||||
0xDA, 0x1E, 0x68, 0x56, 0xA3, 0x48, 0xEE, 0xA7,
|
||||
0x92, 0xA9, 0x09, 0x83, 0x42, 0x04, 0x06, 0x9E,
|
||||
0x62, 0xBB
|
||||
};
|
||||
|
||||
psa_status_t
|
||||
rss_delegated_attest_get_delegated_key(uint8_t ecc_curve,
|
||||
uint32_t key_bits,
|
||||
uint8_t *key_buf,
|
||||
size_t key_buf_size,
|
||||
size_t *key_size,
|
||||
uint32_t hash_algo)
|
||||
{
|
||||
(void)ecc_curve;
|
||||
(void)key_bits;
|
||||
(void)hash_algo;
|
||||
|
||||
if (key_buf_size < sizeof(delegated_key)) {
|
||||
return PSA_ERROR_BUFFER_TOO_SMALL;
|
||||
}
|
||||
|
||||
(void)memcpy(key_buf, delegated_key, sizeof(delegated_key));
|
||||
*key_size = sizeof(delegated_key);
|
||||
|
||||
return PSA_SUCCESS;
|
||||
}
|
||||
psa_status_t
|
||||
rss_delegated_attest_get_token(const uint8_t *dak_pub_hash,
|
||||
size_t dak_pub_hash_size,
|
||||
uint8_t *token_buf,
|
||||
size_t token_buf_size,
|
||||
size_t *token_size)
|
||||
{
|
||||
(void)dak_pub_hash;
|
||||
(void)dak_pub_hash_size;
|
||||
|
||||
if (token_buf_size < sizeof(platform_token)) {
|
||||
return PSA_ERROR_BUFFER_TOO_SMALL;
|
||||
}
|
||||
|
||||
(void)memcpy(token_buf, platform_token, sizeof(platform_token));
|
||||
*token_size = sizeof(platform_token);
|
||||
|
||||
return PSA_SUCCESS;
|
||||
}
|
||||
#endif /* !PLAT_RSS_NOT_SUPPORTED */
|
||||
Loading…
Add table
Reference in a new issue