Merge branch 'maint-0.2.9' into maint-0.3.1

1 files changed, 26 insertions, 1 deletions

diff --git a/src/common/address.c b/src/common/address.c
index 894e15114c..e6b437e9dd 100644
--- a/src/common/address.c
+++ b/src/common/address.c
@@ -1183,6 +1183,9 @@ tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2,
   }
 }
 
+/** Input for siphash, to produce some output for an unspec value. */
+static const uint32_t unspec_hash_input[] = { 0x4e4df09f, 0x92985342 };
+
 /** Return a hash code based on the address addr. DOCDOC extra */
 uint64_t
 tor_addr_hash(const tor_addr_t *addr)
@@ -1191,7 +1194,7 @@ tor_addr_hash(const tor_addr_t *addr)
   case AF_INET:
     return siphash24g(&addr->addr.in_addr.s_addr, 4);
   case AF_UNSPEC:
-    return 0x4e4d5342;
+    return siphash24g(unspec_hash_input, sizeof(unspec_hash_input));
   case AF_INET6:
     return siphash24g(&addr->addr.in6_addr.s6_addr, 16);
   default:
@@ -1202,6 +1205,28 @@ tor_addr_hash(const tor_addr_t *addr)
   }
 }
 
+/** As tor_addr_hash, but use a particular siphash key. */
+uint64_t
+tor_addr_keyed_hash(const struct sipkey *key, const tor_addr_t *addr)
+{
+  /* This is duplicate code with tor_addr_hash, since this function needs to
+   * be backportable all the way to 0.2.9. */
+
+  switch (tor_addr_family(addr)) {
+  case AF_INET:
+    return siphash24(&addr->addr.in_addr.s_addr, 4, key);
+  case AF_UNSPEC:
+    return siphash24(unspec_hash_input, sizeof(unspec_hash_input), key);
+  case AF_INET6:
+    return siphash24(&addr->addr.in6_addr.s6_addr, 16, key);
+  default:
+    /* LCOV_EXCL_START */
+    tor_fragile_assert();
+    return 0;
+    /* LCOV_EXCL_END */
+  }
+}
+
 /** Return a newly allocated string with a representation of <b>addr</b>. */
 char *
 tor_addr_to_str_dup(const tor_addr_t *addr)