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Change the TYPE_PRNG_SEED length to 24.

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This matches what the code actually sends.  It's shorter than the
ScrambleSuit PRNG seed, but that's because the SipHash-2-4 based
Hash_DRBG has 24 bytes of internal state (key + initial output).
This commit is contained in:
Yawning Angel 2014-08-27 12:26:09 +00:00
parent 468cd4bde8
commit 94d3fe9a08
1 changed files with 3 additions and 3 deletions
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doc/obfs4-spec.txt
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@ -104,7 +104,7 @@
Length of the ntor AUTH tag (A HMAC-SHA256 digest).
InlineSeedFrameLength = 53
InlineSeedFrameLength = 45
Length of a unpadded TYPE_PRNG_SEED frame.
@ -144,7 +144,7 @@
The amount of padding is chosen such that the smallest possible request and
response (requests and responses with the minimum amount of padding) are
equal in size. For details on the InlineSeedFrameLength, see section 7.
equal in size. For details on the InlineSeedFrameLength, see section 6.
The client handshake process is as follows.
@ -282,7 +282,7 @@
TYPE_PRNG_SEED (0x01):
The entire payload is to be treated as seeding material for the
protocol polymorphism PRNG. The format is 32 bytes of seeding
protocol polymorphism PRNG. The format is 24 bytes of seeding
material.
Implementations SHOULD ignore unknown packet types for the purposes of