diff --git a/tools/testing/selftests/x86/sgx/Makefile b/tools/testing/selftests/x86/sgx/Makefile
index f838700029e2..ff0136310c2b 100644
--- a/tools/testing/selftests/x86/sgx/Makefile
+++ b/tools/testing/selftests/x86/sgx/Makefile
@@ -31,7 +31,7 @@ $(OUTPUT)/encl.elf: encl.lds encl.c encl_bootstrap.S
 	$(CC) $(ENCL_CFLAGS) -T $^ -o $@
 
 $(OUTPUT)/encl.ss: $(OUTPUT)/encl.bin
-	$(OUTPUT)/sgxsign signing_key.pem $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
+	$(OUTPUT)/sgxsign $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
 
 $(OUTPUT)/sgxsign: sgxsign.c
 	$(CC) $(INCLUDES) -o $@ $< -lcrypto
diff --git a/tools/testing/selftests/x86/sgx/sgxsign.c b/tools/testing/selftests/x86/sgx/sgxsign.c
index 3d9007af40c9..8d62437186ed 100644
--- a/tools/testing/selftests/x86/sgx/sgxsign.c
+++ b/tools/testing/selftests/x86/sgx/sgxsign.c
@@ -60,29 +60,35 @@ static inline const BIGNUM *get_modulus(RSA *key)
 #endif
 }
 
-static RSA *load_sign_key(const char *path)
+static RSA *gen_sign_key(void)
 {
-	FILE *f;
+	BIGNUM *e;
 	RSA *key;
+	int ret;
 
-	f = fopen(path, "rb");
-	if (!f) {
-		fprintf(stderr, "Unable to open %s\n", path);
-		return NULL;
-	}
+	e = BN_new();
 	key = RSA_new();
-	if (!PEM_read_RSAPrivateKey(f, &key, NULL, NULL))
-		return NULL;
-	fclose(f);
 
-	if (BN_num_bytes(get_modulus(key)) != SGX_MODULUS_SIZE) {
-		fprintf(stderr, "Invalid key size %d\n",
-			BN_num_bytes(get_modulus(key)));
-		RSA_free(key);
-		return NULL;
-	}
+	if (!e || !key)
+		goto err;
+
+	ret = BN_set_word(e, RSA_F4);
+	if (ret != 1)
+		goto err;
+
+	ret = RSA_generate_key_ex(key, 3072, e, NULL);
+	if (ret != 1)
+		goto err;
+
+	BN_free(e);
 
 	return key;
+
+err:
+	RSA_free(key);
+	BN_free(e);
+
+	return NULL;
 }
 
 static void reverse_bytes(void *data, int length)
@@ -424,8 +430,8 @@ int main(int argc, char **argv)
 	uint64_t header2[2] = {0x0000006000000101, 0x0000000100000060};
 	struct sgx_sigstruct ss;
 	const char *program;
-	int opt;
 	RSA *sign_key;
+	int opt;
 
 	memset(&ss, 0, sizeof(ss));
 	ss.header.header1[0] = header1[0];
@@ -443,19 +449,6 @@ int main(int argc, char **argv)
 
 	program = argv[0];
 
-	do {
-		opt = getopt(argc, argv, "");
-		switch (opt) {
-		case -1:
-			break;
-		default:
-			exit_usage(program);
-		}
-	} while (opt != -1);
-
-	argc -= optind;
-	argv += optind;
-
 	if (argc < 3)
 		exit_usage(program);
 
@@ -463,7 +456,7 @@ int main(int argc, char **argv)
 	if (check_crypto_errors())
 		exit(1);
 
-	sign_key = load_sign_key(argv[0]);
+	sign_key = gen_sign_key();
 	if (!sign_key)
 		goto out;
 
diff --git a/tools/testing/selftests/x86/sgx/signing_key.pem b/tools/testing/selftests/x86/sgx/signing_key.pem
deleted file mode 100644
index d76f21f19187..000000000000
--- a/tools/testing/selftests/x86/sgx/signing_key.pem
+++ /dev/null
@@ -1,39 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIIG4wIBAAKCAYEApalGbq7Q+usM91CPtksu3D+b0Prc8gAFL6grM3mg85A5Bx8V
-cfMXPgtrw8EYFwQxDAvzZWwl+9VfOX0ECrFRBkOHcOiG0SnADN8+FLj1UiNUQwbp
-S6OzhNWuRcSbGraSOyUlVlV0yMQSvewyzGklOaXBe30AJqzIBc8QfdSxKuP8rs0Z
-ga6k/Bl73osrYKByILJTUUeZqjLERsE6GebsdzbWgKn8qVqng4ZS4yMNg6LeRlH3
-+9CIPgg4jwpSLHcp7dq2qTIB9a0tGe9ayp+5FbucpB6U7ePold0EeRN6RlJGDF9k
-L93v8P5ykz5G5gYZ2g0K1X2sHIWV4huxPgv5PXgdyQYbK+6olqj0d5rjYuwX57Ul
-k6SroPS1U6UbdCjG5txM+BNGU0VpD0ZhrIRw0leQdnNcCO9sTJuInZrgYacSVJ7u
-mtB+uCt+uzUesc+l+xPRYA+9e14lLkZp7AAmo9FvL816XDI09deehJ3i/LmHKCRN
-tuqC5TprRjFwUr6dAgEDAoIBgG5w2Z8fNfycs0+LCnmHdJLVEotR6KFVWMpwHMz7
-wKJgJgS/Y6FMuilc8oKAuroCy11dTO5IGVKOP3uorVx2NgQtBPXwWeDGgAiU1A3Q
-o4wXjYIEm4fCd63jyYPYZ2ckYXzDbjmOTdstYdPyzIhGGNEZK6eoqsRzMAPfYFPj
-IMdCqHSIu6vJw1K7p+myHOsVoWshjODaZnF3LYSA0WaZ8vokjwBxUxuRxQJZjJds
-s60XPtmL+qfgWtQFewoG4XL6GuD8FcXccynRRtzrLtFNPIl9BQfWfjBBhTC1/Te1
-0Z6XbZvpdUTD9OfLB7SbR2OUFNpKQgriO0iYVdbW3cr7uu38Zwp4W1TX73DPjoi6
-KNooP6SGWd4mRJW2+dUmSYS4QNG8eVVZswKcploEIXlAKRsOe4kzJJ1iETugIe85
-uX8nd1WYEp65xwoRUg8hqng0MeyveVbXqNKuJG6tzNDt9kgFYo+hmC/oouAW2Dtc
-T9jdRAwKJXqA2Eg6OkgXCEv+kwKBwQDYaQiFMlFhsmLlqI+EzCUh7c941/cL7m6U
-7j98+8ngl0HgCEcrc10iJVCKakQW3YbPzAx3XkKTaGjWazvvrFarXIGlOud64B8a
-iWyQ7VdlnmZnNEdk+C83tI91OQeaTKqRLDGzKh29Ry/jL8Pcbazt+kDgxa0H7qJp
-roADUanLQuNkYubpbhFBh3xpa2EExaVq6rF7nIVsD8W9TrbmPKA4LgH7z0iy544D
-kVCNYsTjYDdUWP+WiSor8kCnnpjnN9sCgcEAw/eNezUD1UDf6OYFC9+5JZJFn4Tg
-mZMyN93JKIb199ffwnjtHUSjcyiWeesXucpzwtGbTcwQnDisSW4oneYKLSEBlBaq
-scqiUugyGZZOthFSCbdXYXMViK2vHrKlkse7GxVlROKcEhM/pRBrmjaGO8eWR+D4
-FO2wCXzVs3KgV6j779frw0vC54oHOxc9+Lu1rSHp4i+600koyvL/zF6U/5tZXIvN
-YW2yoiQJnjCmVA1pwbwV6KAUTPDTMnBK+YjnAoHBAJBGBa4hi5Z27JkbCliIGMFJ
-NPs6pLKe9GNJf6in2+sPgUAFhMeiPhbDiwbxgrnpBIqICE+ULGJFmzmc0p/IOceT
-ARjR76dAFLxbnbXzj5kURETNhO36yiUjCk4mBRGIcbYddndxaSjaH+zKgpLzyJ6m
-1esuc1qfFvEfAAI2cTIsl5hB70ZJYNZaUvDyQK3ZGPHxy6e9rkgKg9OJz0QoatAe
-q/002yHvtAJg4F5B2JeVejg7VQ8GHB1MKxppu0TP5wKBwQCCpQj8zgKOKz/wmViy
-lSYZDC5qWJW7t3bP6TDFr06lOpUsUJ4TgxeiGw778g/RMaKB4RIz3WBoJcgw9BsT
-7rFza1ZiucchMcGMmswRDt8kC4wGejpA92Owc8oUdxkMhSdnY5jYlxK2t3/DYEe8
-JFl9L7mFQKVjSSAGUzkiTGrlG1Kf5UfXh9dFBq98uilQfSPIwUaWynyM23CHTKqI
-Pw3/vOY9sojrnncWwrEUIG7is5vWfWPwargzSzd29YdRBe8CgcEAuRVewK/YeNOX
-B7ZG6gKKsfsvrGtY7FPETzLZAHjoVXYNea4LVZ2kn4hBXXlvw/4HD+YqcTt4wmif
-5JQlDvjNobUiKJZpzy7hklVhF7wZFl4pCF7Yh43q9iQ7gKTaeUG7MiaK+G8Zz8aY
-HW9rsiihbdZkccMvnPfO9334XMxl3HtBRzLstjUlbLB7Sdh+7tZ3JQidCOFNs5pE
-XyWwnASPu4tKfDahH1UUTp1uJcq/6716CSWg080avYxFcn75qqsb
------END RSA PRIVATE KEY-----
