From 3c3084e1656888d43be3b92169734a6195ec6d75 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Wed, 28 Nov 2012 15:38:37 -0500
Subject: Add a crypto_dh_dup, for benchmark support

---
 src/common/crypto.c | 10 ++++++++++
 src/common/crypto.h |  1 +
 2 files changed, 11 insertions(+)

(limited to 'src/common')

diff --git a/src/common/crypto.c b/src/common/crypto.c
index 39f5a4a642..37d8433966 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -2036,6 +2036,16 @@ crypto_dh_new(int dh_type)
   return NULL;
 }
 
+/** Return a copy of <b>dh</b>, sharing its internal state. */
+crypto_dh_t *
+crypto_dh_dup(const crypto_dh_t *dh)
+{
+  crypto_dh_t *dh_new = tor_malloc_zero(sizeof(crypto_dh_t));
+  dh_new->dh = dh->dh;
+  DH_up_ref(dh->dh);
+  return dh_new;
+}
+
 /** Return the length of the DH key in <b>dh</b>, in bytes.
  */
 int
diff --git a/src/common/crypto.h b/src/common/crypto.h
index 4c5fa6ad97..eb8b1de163 100644
--- a/src/common/crypto.h
+++ b/src/common/crypto.h
@@ -230,6 +230,7 @@ void crypto_hmac_sha256(char *hmac_out,
 #define DH_TYPE_REND 2
 #define DH_TYPE_TLS 3
 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,
-- 
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