Remove SGX demo private key from repo (apache#1237)

apps/sgx/Makefile

@@ -78,7 +78,7 @@ lib/test_addone.so: $(TVM_ROOT)/src/runtime/sgx/trusted/runtime.cc lib/tvm_t.o l
 
 # The signed enclave
 lib/test_addone.signed.so: lib/test_addone.so enclave_config.xml
-	$(sgx_enclave_signer) sign -key enclave_private.pem -enclave $< -out $@ -config enclave_config.xml
+	$(sgx_enclave_signer) sign -key lib/enclave.pem -enclave $< -out $@ -config enclave_config.xml
 
 clean:
 	rm -rf lib

apps/sgx/prepare_test_libs.py

@@ -1,11 +1,52 @@
 """Script to prepare test_addone_sys.o"""
 
+from __future__ import print_function
 from os import path as osp
 
 import tvm
 
 CWD = osp.dirname(osp.abspath(osp.expanduser(__file__)))
 
+KEY_HEAD_FOOT = '-----{} RSA PRIVATE KEY-----'
+KEY = """ MIIG4gIBAAKCAYEAroOogvsj/fZDZY8XFdkl6dJmky0lRvnWMmpeH41Bla6U1qLZ
+AmZuyIF+mQC/cgojIsrBMzBxb1kKqzATF4+XwPwgKz7fmiddmHyYz2WDJfAjIveJ
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+NZmwRwlopysbR69B/n1nefJ84UO50fLh5s5Zr3gBRwbWNZyzhXk=
+""".strip()
+
 def prepare_test_libs(base_path):
     n = tvm.var('n')
     A = tvm.placeholder((n,), name='A')
@@ -20,7 +61,15 @@ def prepare_test_libs(base_path):
     fadd_syslib.save(syslib_path)
 
 def main():
-    prepare_test_libs(osp.join(CWD, 'lib'))
+    out_dir = osp.join(CWD, 'lib')
+
+    prepare_test_libs(out_dir)
+
+    with open(osp.join(out_dir, 'enclave.pem'), 'w') as f_key:
+        print(KEY_HEAD_FOOT.format('BEGIN'), file=f_key)
+        print(KEY, file=f_key)
+        print(KEY_HEAD_FOOT.format('END'), file=f_key)
+
 
 if __name__ == '__main__':
     main()