Example usage for javax.crypto.spec RC5ParameterSpec RC5ParameterSpec

Introduction

In this page you can find the example usage for javax.crypto.spec RC5ParameterSpec RC5ParameterSpec.

Prototype

public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) 

Source Link

Document

Constructs a parameter set for RC5 from the given version, number of rounds, word size (in bits), and IV.

Usage

From source file:it.scoppelletti.programmerpower.security.spi.RC5ParameterSpecFactory.java

public AlgorithmParameterSpec newInstance(Properties props, String prefix) {
    int rounds, version, wordSize;
    String name, value;/*from  w w w .jav a 2  s  .  co  m*/
    byte[] iv;
    AlgorithmParameterSpec param;

    name = Strings.concat(prefix, RC5ParameterSpecFactory.PROP_VERSION);
    value = props.getProperty(name);
    if (Strings.isNullOrEmpty(value)) {
        throw new ArgumentNullException(name);
    }

    version = Integer.parseInt(value);

    name = Strings.concat(prefix, RC5ParameterSpecFactory.PROP_ROUNDS);
    value = props.getProperty(name);
    if (Strings.isNullOrEmpty(value)) {
        throw new ArgumentNullException(name);
    }

    rounds = Integer.parseInt(value);

    name = Strings.concat(prefix, RC5ParameterSpecFactory.PROP_WORDSIZE);
    value = props.getProperty(name);
    if (Strings.isNullOrEmpty(value)) {
        throw new ArgumentNullException(name);
    }

    wordSize = Integer.parseInt(value);

    name = Strings.concat(prefix, RC5ParameterSpecFactory.PROP_IV);
    value = props.getProperty(name);
    if (Strings.isNullOrEmpty(value)) {
        iv = null;
    } else {
        try {
            iv = Hex.decodeHex(value.toCharArray());
        } catch (DecoderException ex) {
            throw SecurityUtils.toSecurityException(ex);
        }
    }

    if (iv != null) {
        param = new RC5ParameterSpec(version, rounds, wordSize, iv);
    } else {
        param = new RC5ParameterSpec(version, rounds, wordSize);
    }

    return param;
}

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