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[Assignment-7] add prototype 'sgx_status_t public_key'
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This commit is contained in:
Sascha Tommasone 2024-07-01 13:07:32 +02:00
parent 7044b96803
commit c33a97d003
Signed by: saschato
GPG key ID: 751068A86FCAA217
3 changed files with 40 additions and 7 deletions
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41
Assignment 7 - SGX Hands-on/src/enclave/enclave.c
View file

@ -3,11 +3,44 @@
#include <sgx_error.h>
#include <sgx_tcrypto.h>
const unsigned char *secretkey_file = "/var/signrelay/sk";
const unsigned char *publickey_file = "/var/signrelay/pk";
sgx_status_t public_key(const uint8_t *sealed, const size_t sealed_size, uint8_t *gx, uint8_t *gy) {
// return if no sealed data provided
if(sealed == NULL)
return SGX_ERROR_UNEXPECTED;
// calculate public_key size and return error for unexpected results
uint32_t pk_size = sgx_get_add_mac_txt_len((const sgx_sealed_data_t *)sealed);
uint32_t sk_size = sgx_get_encrypt_txt_len((const sgx_sealed_data_t *)sealed);
if ((pk_size != 2*SGX_ECP256_KEY_SIZE) || (sk_size != SGX_ECP256_KEY_SIZE))
return SGX_ERROR_UNEXPECTED;
sgx_status_t public_key(uint8_t *gx, uint8_t *gy) {
// TODO
// allocate memory for public and secret key
uint8_t *pk =(uint8_t *)malloc(pk_size);
uint8_t *sk =(uint8_t *)malloc(pk_size);
if((pk == NULL) || (sk == NULL)) {
free(pk);
free(sk);
return SGX_ERROR_OUT_OF_MEMORY;
}
// unseal ecc key pair
sgx_status_t status = sgx_unseal_data((const sgx_sealed_data_t *)sealed, pk, &pk_size, sk, &sk_size);
if (status != SGX_SUCCESS) {
free(pk);
free(sk);
return status;
}
// copy public key into return buffers
if((gx != NULL) && (gy != NULL)) {
memcpy(gx, pk, SGX_ECP256_KEY_SIZE);
memcpy(gy, pk + SGX_ECP256_KEY_SIZE, SGX_ECP256_KEY_SIZE);
}
// free allocated memory and return success
free(pk);
free(sk);
return SGX_SUCCESS;
}
sgx_status_t sign_firmware(uint8_t *data, size_t data_size, uint8_t *signature, size_t signature_size) {

4
Assignment 7 - SGX Hands-on/src/enclave/enclave.edl
View file

@ -40,7 +40,7 @@ enclave {
*/
trusted {
public sgx_status_t public_key([out]uint8_t *gx, [out]uint8_t *gy);
public sgx_status_t public_key([in, size=sealed_size]const uint8_t *sealed, size_t sealed_size, [out]uint8_t *gx, [out]uint8_t *gy);
public sgx_status_t sign_firmware([in, size=data_size]uint8_t *data, size_t data_size, [out, size=signature_size]uint8_t *signature, size_t signature_size);
};
@ -50,6 +50,6 @@ enclave {
* [string]: specifies 'str' is a NULL terminated buffer.
*/
untrusted {
int read_file([in, string] path_to_file, [out, size=bsize] uint8_t *buffer, size_t bsize);
};
};

2
Assignment 7 - SGX Hands-on/src/enclave/enclave.h
View file

@ -37,7 +37,7 @@
#include <assert.h>
#include <sgx_error.h>
sgx_status_t public_key(uint8_t *gx, uint8_t *gy);
sgx_status_t public_key(const uint8_t *sealed, const size_t sealed_size, uint8_t *gx, uint8_t *gy);
sgx_status_t sign_firmware(uint8_t *data, size_t data_size, uint8_t *signature, size_t signature_size);
#endif /* !_ENCLAVE_H_ */