General Statement for SecureRandom return Error - Java

I've searched throughout different forums and now I am finally putting my question as I can't find specific answer.

I am writing security protocol for SunSPOT Sensors as my final year Project.

I wish to generate a 128 bit Key which can be hashed later on, through my search on web I come across that best method to generate the random keys is SecureRandom.

I am trying to implement the general statement to see how it works so that I can use it further according to my requirement

SecureRandom gen = SecureRandom.getInstance("SHA1WITHECDSA");

above statment I have used with "SHA1PRNG", "MD5ECDSA" and "ECDSAWithSHA1Signature" as soon as I complete Statement and put semicolon it return this Error

method getInstance in class com.sun.spot.security.implementation.SecureRandom cannot be applied to given types

required: byte found: java.lang.String

I have added the Jar file respectively to the build.xml and into the build.properties ; also the imported the algori开发者_如何学Pythonthm into the program.

Thanks for reading

and any help is much appriciated

Thankyou Every One who have tried to help.

Hash (Hasnain)

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Why not just say "SecureRandom()" and let the system pick the algorithm? Here is an explicit example:

import java.security.SecureRandom;

public class Rando {
    public static void main(String[] args) {
        System.out.println(new SecureRandom().nextFloat());
    }

}

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Are you using the correct class? You should be using java.security.SecureRandom. Also, SHA1WITHECDSA, MD5ECDSA, and ECDSAWithSHA1Signature are nonsensical as SecureRandom instances.

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Sounds to me as if you're calling a method that requires a byte as argument, but you are supplying a String.

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The error is referring to the class com.sun.spot.security.implementation.SecureRandom. You should presumably be using java.security.SecureRandom (it is this class that has the getInstance method that takes a String).

You probably have an incorrect import statement.

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Instance required for secure random in SunSPOT java application is as follow

SecureRandom gen; gen = SecureRandom.getInstance(SecureRandom.ALG_SECURE_RANDOM);

I would like to Thank Everyone who put their effort to resolve this error.

Thanks once again.