Fix up the multi-hash ratchet thing

pull/177/head
Mark Haines 9 years ago
parent b0d7302ea5
commit 4e42aab245

@ -84,18 +84,22 @@ follows:
.. math::
\begin{align}
R_{2^24n,0} &= H_1\left(R_{2^24(i-1),0}\right) \\
R_{2^24n,1} &= H_2\left(R_{2^24(i-1),0}\right) \\
R_{2^24n,0} &= H_0\left(R_{2^24(i-1),0}\right) \\
R_{2^24n,1} &= H_1\left(R_{2^24(i-1),0}\right) \\
R_{2^24n,2} &= H_2\left(R_{2^24(i-1),0}\right) \\
R_{2^24n,3} &= H_3\left(R_{2^24(i-1),0}\right) \\
R_{2^16n,1} &= H_1\left(R_{2^16(i-1),1}\right) \\
R_{2^16n,2} &= H_2\left(R_{2^16(i-1),1}\right) \\
R_{2^8i,2} &= H_1\left(R_{2^8(i-1),2}\right) \\
R_{2^8i,3} &= H_2\left(R_{2^8(i-1),2}\right) \\
R_{i,3} &= H_1\left(R_{(i-1),3}\right)
R_{2^16n,3} &= H_3\left(R_{2^16(i-1),1}\right) \\
R_{2^8i,2} &= H_2\left(R_{2^8(i-1),2}\right) \\
R_{2^8i,3} &= H_3\left(R_{2^8(i-1),2}\right) \\
R_{i,3} &= H_3\left(R_{(i-1),3}\right)
\end{align}
Where :math:`H_1` and :math:`H_2` are different hash functions. For example
:math:`H_1` could be :math:`HMAC\left(X,\text{"\textbackslash x01"}\right)` and
:math:`H_2` could be :math:`HMAC\left(X,\text{"\textbackslash x02"}\right)`.
Where :math:`H_0`, :math:`H_1`, :math:`H_2`, and :math:`H_3`
are different hash functions. For example
:math:`H_0` could be :math:`HMAC\left(X,\text{"\textbackslash x00"}\right)` and
:math:`H_1` could be :math:`HMAC\left(X,\text{"\textbackslash x01"}\right)`.
So every :math:`2^24` iterations :math:`R_{n,1}` is reseeded from :math:`R_{n,0}`.
Every :math:`2^16` iterations :math:`R_{n,2}` is reseeded from :math:`R_{n,1}`.

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