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update dht_sec definition

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Arvid Norberg
2012-06-07 16:29:20 +00:00
parent dd9db7ebb8
commit 40284b2b99
7 changed files with 39 additions and 33 deletions
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18
docs/dht_sec.rst
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@@ -65,11 +65,11 @@ ID can be restricted at each class level of the IP.
The expression to calculate a valid ID prefix (from an IPv4 address) is::
sha1((ip & 0x30f3fff) .. r)
sha1((ip & 0x01071f7f) .. r)
And for an IPv6 address (``ip`` is the high 64 bits of the address)::
sha1((ip & 0x103070f1f3f7fff) .. r)
sha1((ip & 0x000103070f1f3f7f) .. r)
``r`` is a random number in the range [0, 7]. The resulting integer,
representing the masked IP address is supposed to be big-endian before
@@ -91,8 +91,8 @@ Example code code for calculating a valid node ID::
int num_octets; // the number of octets to consider in ip (4 or 8)
uint8_t node_id[20]; // resulting node ID
uint8_t v4mask[] = { 0x03, 0x0f, 0x3f, 0xff };
uint8_t v6mask[] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
uint8_t v4mask[] = { 0x01, 0x07, 0x1f, 0x7f };
uint8_t v6mask[] = { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f };
uint8_t* mask = num_octets == 4 ? v4_mask : v8_mask;
for (int i = 0; i < num_octets; ++i)
@@ -114,11 +114,11 @@ test vectors:
IP rand example node ID
============ ===== ==========================================
124.31.75.21 1 **8a84ac4d** 0c5d6a4ec8a88e4c6ab4c28b95eee4 **01**
21.75.31.124 86 **1167d8b9** 4e7a08645677bbd1cfe7d8f956d532 **56**
65.23.51.170 22 **508e075d** bc8f112a3d426c84764f8c2a1150e6 **16**
84.124.73.14 65 **095d76cb** 1bb1fe518101ceef99462b947a01ff **41**
43.213.53.83 90 **f62b5a2f** 5b7c4be0237986d5243b87aa6d5130 **5a**
124.31.75.21 1 **f766f9f5** 0c5d6a4ec8a88e4c6ab4c28b95eee4 **01**
21.75.31.124 86 **7ee04779** 4e7a08645677bbd1cfe7d8f956d532 **56**
65.23.51.170 22 **76a626ff** bc8f112a3d426c84764f8c2a1150e6 **16**
84.124.73.14 65 **beb4e619** 1bb1fe518101ceef99462b947a01ff **41**
43.213.53.83 90 **ace5613a** 5b7c4be0237986d5243b87aa6d5130 **5a**
The bold parts of the node ID are the important parts. The rest are
random numbers.