static TPM_RESULT execute_TPM_GetPubKey(TPM_REQUEST *req, TPM_RESPONSE *rsp)
{
BYTE *ptr;
UINT32 len;
TPM_KEY_HANDLE keyHandle;
TPM_PUBKEY pubKey;
TPM_RESULT res;
/* compute parameter digest */
tpm_compute_in_param_digest(req);
/* unmarshal input */
ptr = req->param;
len = req->paramSize;
if (tpm_unmarshal_TPM_KEY_HANDLE(&ptr, &len, &keyHandle)
|| len != 0) return TPM_BAD_PARAMETER;
/* execute command */
res = TPM_GetPubKey(keyHandle, &req->auth1, &pubKey);
if (res != TPM_SUCCESS) return res;
/* marshal output */
rsp->paramSize = len = sizeof_TPM_PUBKEY(pubKey);
rsp->param = ptr = malloc(len);
if (ptr == NULL
|| tpm_marshal_TPM_PUBKEY(&ptr, &len, &pubKey)) {
free(rsp->param);
res = TPM_FAIL;
}
free_TPM_PUBKEY(pubKey);
return res;
}
static int tpm_compute_migration_digest(TPM_PUBKEY *migrationKey,
TPM_MIGRATE_SCHEME migrationScheme,
TPM_NONCE *tpmProof, TPM_DIGEST *digest)
{
tpm_sha1_ctx_t sha1;
UINT32 len = sizeof_TPM_PUBKEY((*migrationKey));
BYTE *buf, *ptr, buf2[2];
buf = ptr = tpm_malloc(len);
if (buf == NULL
|| tpm_marshal_TPM_PUBKEY(&ptr, &len, migrationKey)) {
tpm_free(buf);
return -1;
}
/* compute SHA1 hash */
tpm_sha1_init(&sha1);
tpm_sha1_update(&sha1, buf, sizeof_TPM_PUBKEY((*migrationKey)));
ptr = buf2; len = 2;
tpm_marshal_UINT16(&ptr, &len, migrationScheme);
tpm_sha1_update(&sha1, buf2, 2);
tpm_sha1_update(&sha1, tpmProof->nonce, sizeof(TPM_NONCE));
tpm_sha1_final(&sha1, digest->digest);
tpm_free(buf);
return 0;
}
