1 files changed, 49 insertions, 0 deletions
diff --git a/src/common/crypto_dh.h b/src/common/crypto_dh.h
new file mode 100644
index 0000000000..111c199faa
--- /dev/null
+++ b/src/common/crypto_dh.h
@@ -0,0 +1,49 @@
+/* Copyright (c) 2001, Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2017, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file crypto_dh.h
+ *
+ * \brief Headers for crypto_dh.c
+ **/
+
+#ifndef TOR_CRYPTO_DH_H
+#define TOR_CRYPTO_DH_H
+
+#include "util.h"
+
+/** Length of our DH keys. */
+#define DH_BYTES (1024/8)
+
+typedef struct crypto_dh_t crypto_dh_t;
+
+/* Key negotiation */
+#define DH_TYPE_CIRCUIT 1
+#define DH_TYPE_REND 2
+#define DH_TYPE_TLS 3
+void crypto_set_tls_dh_prime(void);
+crypto_dh_t *crypto_dh_new(int dh_type);
+crypto_dh_t *crypto_dh_dup(const crypto_dh_t *dh);
+int crypto_dh_get_bytes(crypto_dh_t *dh);
+int crypto_dh_generate_public(crypto_dh_t *dh);
+int crypto_dh_get_public(crypto_dh_t *dh, char *pubkey_out,
+                         size_t pubkey_out_len);
+ssize_t crypto_dh_compute_secret(int severity, crypto_dh_t *dh,
+                             const char *pubkey, size_t pubkey_len,
+                             char *secret_out, size_t secret_out_len);
+void crypto_dh_free_(crypto_dh_t *dh);
+#define crypto_dh_free(dh) FREE_AND_NULL(crypto_dh_t, crypto_dh_free_, (dh))
+
+/* Crypto DH free */
+void crypto_dh_free_all(void);
+
+/* Prototypes for private functions only used by tortls.c, crypto.c, and the
+ * unit tests. */
+struct dh_st;
+struct dh_st *crypto_dh_get_dh_(crypto_dh_t *dh);
+
+#endif /* !defined(TOR_CRYPTO_DH_H) */
+