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PSASpake2p.cpp
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/*
* Copyright (c) 2024 Project CHIP Authors
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "PSASpake2p.h"
#include "CHIPCryptoPALPSA.h"
#include <lib/support/CodeUtils.h>
#include <psa/crypto.h>
namespace chip {
namespace Crypto {
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::Init(const uint8_t * context, size_t context_len)
{
Clear();
VerifyOrReturnError(context_len <= sizeof(mContext), CHIP_ERROR_BUFFER_TOO_SMALL);
memcpy(mContext, context, context_len);
mContextLen = context_len;
return CHIP_NO_ERROR;
}
void PSASpake2p_P256_SHA256_HKDF_HMAC::Clear()
{
IgnoreUnusedVariable(psa_pake_abort(&mOperation));
mOperation = psa_pake_operation_init();
IgnoreUnusedVariable(psa_destroy_key(mKey));
mKey = PSA_KEY_ID_NULL;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::BeginVerifier(const uint8_t * my_identity, size_t my_identity_len,
const uint8_t * peer_identity, size_t peer_identity_len,
const uint8_t * w0in, size_t w0in_len, const uint8_t * Lin,
size_t Lin_len)
{
VerifyOrReturnError(w0in_len <= kSpake2p_WS_Length, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(Lin_len == kP256_Point_Length, CHIP_ERROR_INVALID_ARGUMENT);
uint8_t password[kSpake2p_WS_Length + kP256_Point_Length];
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_pake_cipher_suite_t cp = PSA_PAKE_CIPHER_SUITE_INIT;
psa_pake_cs_set_algorithm(&cp, PSA_ALG_SPAKE2P_MATTER);
psa_pake_cs_set_primitive(&cp, PSA_PAKE_PRIMITIVE(PSA_PAKE_PRIMITIVE_TYPE_ECC, PSA_ECC_FAMILY_SECP_R1, 256));
memcpy(password + 0, w0in, w0in_len);
memcpy(password + w0in_len, Lin, Lin_len);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&attributes, PSA_ALG_SPAKE2P_MATTER);
psa_set_key_type(&attributes, PSA_KEY_TYPE_SPAKE2P_PUBLIC_KEY(PSA_ECC_FAMILY_SECP_R1));
psa_status_t status = psa_import_key(&attributes, password, w0in_len + Lin_len, &mKey);
psa_reset_key_attributes(&attributes);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_setup(&mOperation, mKey, &cp);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
mRole = PSA_PAKE_ROLE_SERVER;
status = psa_pake_set_role(&mOperation, PSA_PAKE_ROLE_SERVER);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_peer(&mOperation, peer_identity, peer_identity_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_user(&mOperation, my_identity, my_identity_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_context(&mOperation, mContext, mContextLen);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::BeginProver(const uint8_t * my_identity, size_t my_identity_len,
const uint8_t * peer_identity, size_t peer_identity_len,
const uint8_t * w0in, size_t w0in_len, const uint8_t * w1in,
size_t w1in_len)
{
VerifyOrReturnError(w0in_len <= kSpake2p_WS_Length, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(w1in_len <= kSpake2p_WS_Length, CHIP_ERROR_INVALID_ARGUMENT);
uint8_t password[kSpake2p_WS_Length * 2];
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_pake_cipher_suite_t cp = PSA_PAKE_CIPHER_SUITE_INIT;
psa_pake_cs_set_algorithm(&cp, PSA_ALG_SPAKE2P_MATTER);
psa_pake_cs_set_primitive(&cp, PSA_PAKE_PRIMITIVE(PSA_PAKE_PRIMITIVE_TYPE_ECC, PSA_ECC_FAMILY_SECP_R1, 256));
memcpy(password + 0, w0in, w0in_len);
memcpy(password + w0in_len, w1in, w1in_len);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&attributes, PSA_ALG_SPAKE2P_MATTER);
psa_set_key_type(&attributes, PSA_KEY_TYPE_SPAKE2P_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1));
psa_status_t status = psa_import_key(&attributes, password, w0in_len + w1in_len, &mKey);
psa_reset_key_attributes(&attributes);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_setup(&mOperation, mKey, &cp);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
mRole = PSA_PAKE_ROLE_CLIENT;
status = psa_pake_set_role(&mOperation, PSA_PAKE_ROLE_CLIENT);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_user(&mOperation, my_identity, my_identity_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_peer(&mOperation, peer_identity, peer_identity_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
status = psa_pake_set_context(&mOperation, mContext, mContextLen);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::ComputeRoundOne(const uint8_t * pab, size_t pab_len, uint8_t * out, size_t * out_len)
{
VerifyOrReturnError(out_len != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
psa_status_t status;
if (mRole == PSA_PAKE_ROLE_SERVER)
{
status = psa_pake_input(&mOperation, PSA_PAKE_STEP_KEY_SHARE, pab, pab_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
}
status = psa_pake_output(&mOperation, PSA_PAKE_STEP_KEY_SHARE, out, *out_len, out_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::ComputeRoundTwo(const uint8_t * in, size_t in_len, uint8_t * out, size_t * out_len)
{
VerifyOrReturnError(out_len != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
psa_status_t status;
if (mRole == PSA_PAKE_ROLE_CLIENT)
{
status = psa_pake_input(&mOperation, PSA_PAKE_STEP_KEY_SHARE, in, in_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
}
status = psa_pake_output(&mOperation, PSA_PAKE_STEP_CONFIRM, out, *out_len, out_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::KeyConfirm(const uint8_t * in, size_t in_len)
{
psa_status_t status = psa_pake_input(&mOperation, PSA_PAKE_STEP_CONFIRM, in, in_len);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR PSASpake2p_P256_SHA256_HKDF_HMAC::GetKeys(SessionKeystore & keystore, HkdfKeyHandle & key)
{
auto & keyId = key.AsMutable<psa_key_id_t>();
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_type(&attributes, PSA_KEY_TYPE_DERIVE);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&attributes, PSA_ALG_HKDF(PSA_ALG_SHA_256));
psa_status_t status = psa_pake_get_shared_key(&(mOperation), &attributes, &keyId);
VerifyOrReturnError(status == PSA_SUCCESS, CHIP_ERROR_INTERNAL);
return CHIP_NO_ERROR;
}
CHIP_ERROR Spake2pVerifier::Generate(uint32_t pbkdf2IterCount, const ByteSpan & salt, uint32_t setupPin)
{
psa_status_t status = PSA_SUCCESS;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_id_t passwordKey = PSA_KEY_ID_NULL;
psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;
psa_key_id_t spakeKey = PSA_KEY_ID_NULL;
uint8_t verifier[kP256_FE_Length + kP256_Point_Length];
size_t verifierLen;
// Prepare password key
uint8_t password[sizeof(uint32_t)];
Encoding::LittleEndian::Put32(password, setupPin);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&attributes, PSA_ALG_PBKDF2_HMAC(PSA_ALG_SHA_256));
psa_set_key_type(&attributes, PSA_KEY_TYPE_PASSWORD);
status = psa_import_key(&attributes, password, sizeof(password), &passwordKey);
psa_reset_key_attributes(&attributes);
VerifyOrExit(status == PSA_SUCCESS, );
// Run PBKDF
status = psa_key_derivation_setup(&operation, PSA_ALG_PBKDF2_HMAC(PSA_ALG_SHA_256));
VerifyOrExit(status == PSA_SUCCESS, );
status = psa_key_derivation_input_integer(&operation, PSA_KEY_DERIVATION_INPUT_COST, pbkdf2IterCount);
VerifyOrExit(status == PSA_SUCCESS, );
status = psa_key_derivation_input_bytes(&operation, PSA_KEY_DERIVATION_INPUT_SALT, salt.data(), salt.size());
VerifyOrExit(status == PSA_SUCCESS, );
status = psa_key_derivation_input_key(&operation, PSA_KEY_DERIVATION_INPUT_PASSWORD, passwordKey);
VerifyOrExit(status == PSA_SUCCESS, );
attributes = psa_key_attributes_init();
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT);
psa_set_key_algorithm(&attributes, PSA_ALG_SPAKE2P_MATTER);
psa_set_key_type(&attributes, PSA_KEY_TYPE_SPAKE2P_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1));
psa_set_key_bits(&attributes, kP256_FE_Length * 8);
status = psa_key_derivation_output_key(&attributes, &operation, &spakeKey);
psa_reset_key_attributes(&attributes);
VerifyOrExit(status == PSA_SUCCESS, );
// Export verifier as raw bytes
status = psa_export_public_key(spakeKey, verifier, sizeof(verifier), &verifierLen);
exit:
psa_key_derivation_abort(&operation);
psa_destroy_key(passwordKey);
psa_destroy_key(spakeKey);
if (status != PSA_SUCCESS)
{
ChipLogError(Crypto, "PSA error: %d", static_cast<int>(status));
return CHIP_ERROR_INTERNAL;
}
return Deserialize(ByteSpan(verifier, verifierLen));
}
} // namespace Crypto
} // namespace chip