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[Assignment-7] update sign_firmware

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This commit is contained in:
Sascha Tommasone 2024-07-03 17:00:36 +02:00
parent cb9917f7b4
commit a08e4614c6
Signed by: saschato
GPG key ID: 751068A86FCAA217
1 changed files with 22 additions and 2 deletions
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24
7-SGX_Hands-on/src/enclave/enclave.c
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@ -194,15 +194,29 @@ static sgx_status_t verify_signature(const uint8_t *data, const uint32_t data_si
return result; return result;
} }
sgx_status_t sign_firmware(const uint8_t *data, uint32_t data_size, uint8_t *sealed, uint32_t sealed_size, uint8_t *signature, uint32_t signature_size) { sgx_status_t sign_firmware(const uint8_t *data, uint32_t data_size, uint8_t *sealed, uint32_t sealed_size, const uint8_t *public_key, uint32_t public_key_size, uint8_t *signature, uint32_t signature_size) {
// invalid parameter handling // invalid parameter handling
if((data == NULL) || (data_size == 0)) { if((data == NULL) || (data_size == 0)) {
return SGX_ERROR_INVALID_PARAMETER; return SGX_ERROR_INVALID_PARAMETER;
} else if((sealed == NULL) || (sealed_size == 0)) { } else if((sealed == NULL) || (sealed_size == 0)) {
return SGX_ERROR_INVALID_PARAMETER; return SGX_ERROR_INVALID_PARAMETER;
} else if((public_key == NULL) || (public_key_size != PK_SIZE)) {
return SGX_ERROR_INVALID_PARAMETER;
} }
// verify public key
for(size_t i = 0; i < sizeof(authorized)/sizeof(authorized[0]); i++) {
if(memcmp(public_key, authorized[i].gx, PK_SIZE) != 0) {
continue;
}
goto sign;
}
return SGX_ERROR_UNEXPECTED;
sign: ;
// declare need structures // declare need structures
sgx_ec256_signature_t ecc_signature;
sgx_ecc_state_handle_t ecc_handle; sgx_ecc_state_handle_t ecc_handle;
sgx_ec256_private_t private; sgx_ec256_private_t private;
sgx_ec256_public_t public; sgx_ec256_public_t public;
@ -213,6 +227,13 @@ sgx_status_t sign_firmware(const uint8_t *data, uint32_t data_size, uint8_t *sea
return status; return status;
} }
// verify request
/*
if((status = verify_signature(data, data_size, (const sgx_ec256_public_t *)public_key, (const sgx_ec256_signature_t *)signature)) != SGX_EC_VALID) {
sgx_ecc256_close_context(ecc_handle);
return status;
}*/
// try unseal keypair // try unseal keypair
sgx_status_t seal_status; sgx_status_t seal_status;
if(seal_status = unseal_key_pair(sealed, &private, NULL) != SGX_SUCCESS) { if(seal_status = unseal_key_pair(sealed, &private, NULL) != SGX_SUCCESS) {
@ -223,7 +244,6 @@ sgx_status_t sign_firmware(const uint8_t *data, uint32_t data_size, uint8_t *sea
} }
// create signature // create signature
sgx_ec256_signature_t ecc_signature;
if((status = sgx_ecdsa_sign(data, data_size, &private, &ecc_signature, ecc_handle)) != SGX_SUCCESS) { if((status = sgx_ecdsa_sign(data, data_size, &private, &ecc_signature, ecc_handle)) != SGX_SUCCESS) {
sgx_ecc256_close_context(ecc_handle); sgx_ecc256_close_context(ecc_handle);
return status; return status;