Hello world,
I need some urgent help!
Due to some project purposes I cannot change I have to modify the initial value
for the RIPEMD-160 algorithm
depending on another result from the RIPEMD-160 algorithm.
I am using Java 1.3.1 with gnu crypto 1.1
(The important class RipeMD160.java has not been changed compared to gnu crypto
2.0.1).
I want to do something like this:
(let newIV be an result of the RIPEMD-160 - e.g.
"9c1185a5c5e9fc54612808977ee8f548b2258d31")
public void setIV(String newIV) {
h0 = Integer.parseInt(newIV.substring(0, 8).toUpperCase(), 16);
h1 = Integer.parseInt(newIV.substring(8, 16).toUpperCase(), 16);
h2 = Integer.parseInt(newIV.substring(16, 24).toUpperCase(), 16);
h3 = Integer.parseInt(newIV.substring(24, 32).toUpperCase(), 16);
h4 = Integer.parseInt(newIV.substring(32, 40).toUpperCase(), 16);
}
In other words, I have to split the result in 5 4-byte-words and use them as
new initial values for the next calculation.
In the current implementation of the RipeMD160-class, the initial value
variables are declared as int.
It is possible that result.substring(0, 8) would be "FFFFFFFF" (greater than
7FFFFFFF - max value for JAVA int)
for instance? In this case, this value would be greater than the max value of
an JAVA int and I will get a problem!
Is there a different (or correct) way to set the initial value so that the
problem will not occur?
Or is the problem not existing? Why?
Thank you for your help.
Kind regards
Ronald
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