[GNU Crypto] W.: RipeMD160 - Changing the initial value

[ronald.crypto@xxxxxxxx]

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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