linux-sgx-trts-modified/sdk/protected_code_loader/unseal/sim/pcl_deriv.cpp

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/* Content from sdk/simulation/tinst/deriv.cpp */

#include "t_instructions.h"    /* for `g_global_data_sim' */
#include "deriv.h"
#include <sgx_tseal.h>
#include <pcl_common.h>
#include <pcl_unseal_internal.h>

extern global_data_sim_t g_global_data_sim;

int pcl_cmac(const sgx_cmac_128bit_key_t *p_key, const uint8_t *p_src,
    uint32_t src_len, sgx_cmac_128bit_tag_t *p_mac);

// The built-in seal key in simulation mode
static const uint8_t PCL_BASE_SEAL_KEY[] = {
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
    0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff,
};

static const uint8_t* pcl_get_base_key(uint16_t key_name)
{
    // Shouldn't use switch else requires relocation
/* PCL UNUSED START *
    switch (key_name) {
    case SGX_KEYSELECT_SEAL:
        return BASE_SEAL_KEY;
    case SGX_KEYSELECT_REPORT:
        return BASE_REPORT_KEY;
    case SGX_KEYSELECT_EINITTOKEN:
        return BASE_EINITTOKEN_KEY;
    case SGX_KEYSELECT_PROVISION:
        return BASE_PROVISION_KEY;
    case SGX_KEYSELECT_PROVISION_SEAL:
        return BASE_PROV_SEAL_KEY;
    }
/* PCL UNUSED END   */
    if (key_name == SGX_KEYSELECT_SEAL) return PCL_BASE_SEAL_KEY;    
	
    // Should not come here - error should have been reported
    // when the key name is not supported in the caller.
    return (uint8_t*)0;
}

// Compute the CMAC of derivation data with corresponding base key
// and save it to `okey'.
void pcl_derive_key(const derivation_data_t* dd, sgx_key_128bit_t okey)
{
    const uint8_t* base_key = pcl_get_base_key(dd->key_name);
    pcl_cmac((const sgx_cmac_128bit_key_t*)base_key,dd->ddbuf, dd->size, (sgx_cmac_128bit_tag_t*)okey);
}