Move literally everything out of src/or

This commit won't build yet -- it just puts everything in a slightly
more logical place.

The reasoning here is that "src/core" will hold the stuff that every (or
nearly every) tor instance will need in order to do onion routing.
Other features (including some necessary ones) will live in
"src/feature".  The "src/app" directory will hold the stuff needed
to have Tor be an application you can actually run.

This commit DOES NOT refactor the former contents of src/or into a
logical set of acyclic libraries, or change any code at all.  That
will have to come in the future.

We will continue to move things around and split them in the future,
but I hope this lays a reasonable groundwork for doing so.

1 files changed, 31 insertions, 0 deletions

diff --git a/src/core/or/relay_crypto_st.h b/src/core/or/relay_crypto_st.h
new file mode 100644
index 0000000000..f186e182f0
--- /dev/null
+++ b/src/core/or/relay_crypto_st.h
@@ -0,0 +1,31 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef RELAY_CRYPTO_ST_H
+#define RELAY_CRYPTO_ST_H
+
+#define crypto_cipher_t aes_cnt_cipher
+struct crypto_cipher_t;
+struct crypto_digest_t;
+
+struct relay_crypto_t {
+  /* crypto environments */
+  /** Encryption key and counter for cells heading towards the OR at this
+   * step. */
+  struct crypto_cipher_t *f_crypto;
+  /** Encryption key and counter for cells heading back from the OR at this
+   * step. */
+  struct crypto_cipher_t *b_crypto;
+
+  /** Digest state for cells heading towards the OR at this step. */
+  struct crypto_digest_t *f_digest; /* for integrity checking */
+  /** Digest state for cells heading away from the OR at this step. */
+  struct crypto_digest_t *b_digest;
+
+};
+#undef crypto_cipher_t
+
+#endif