Sample_Java_Hash.java

/*****************************************************************************************
*
* Java_Hash.java
*
******************************************************************************************/

import com.eruces.teagent.TEAgentConnection;
import com.eruces.teagent.TEAgentException;
import com.eruces.teagent.TEAgentConnectionFactory;
import com.eruces.teagent.TEAgentMatrix;

import java.util.TreeMap;

public class Sample_Java_Hash
{
    public void testHash() throws TEAgentException
    {
        // Hash a single data
        String strSingleData = "test string";
        String strSalt = "test salt";
        String strHashed = "";

        TEAgentMatrix matrix = new TEAgentMatrix();
        strHashed = TEAgentMatrix.performHash(strSingleData, strSalt);

        System.out.println("Data = " + strSingleData);
        System.out.println("Salt = " + strSalt);
        System.out.println("Hash value = " + strHashed);

        // Hash a column in a matrix
        int nRows = 2;
        int nCols = 3;
        int i, j;

        String strData [][] = new String[nRows][nCols];
        String strHashVals [] = new String[nRows];
        String strSalt2 = "another test salt";

        // Set data to be encrypted
        for(i = 0; i < nRows; i++)
        {
            strHashVals[i] = "";          // T-tag set to null
            for(j = 0; j < nCols; j++)
                strData[i][j] = "test string"  + "(" + i + ", " +   j + ")";  // Data to be encrypted
        }

        // Set the matrix for hashing
        matrix = new TEAgentMatrix();
        for(i = 0; i < strData.length; i++)
        {
            // Set data for encryption. For TEAgentMatrix, both row count and column count starts at 1
            for(j = 0; j < strData[i].length; j++)
                matrix.setRawElement(strData[i][j].getBytes(), i+1, j+1);
        }

        // Decide which columns to hash, also set salt.
        int nRow2Hash = 1;
        TreeMap<Integer, byte[]> treeMap = new TreeMap<Integer, byte[]>();
        treeMap.put(Integer.valueOf(nRow2Hash), strSalt2.getBytes());  // hash column 1
        matrix.setHashColumns(treeMap);

        // Get hashed value.
        System.out.println();
        System.out.println( "Hash value for column " + nRow2Hash + ":");
        for(i = 1; i <= matrix.getRowCount(); i++)
        {
            String strTemp = new String(matrix.getRawElement(i, nRow2Hash));
            strHashVals[i-1] = matrix.getHashElement(i, nRow2Hash, "" ); // row number, col number, salt
            System.out.println( "Data: " + strTemp + "    Hash value: " + strHashVals[i-1]);
        }
    }

    public static void main()
    {
        try
        {
            Sample_Java_Hash java_hash = new Sample_Java_Hash();
            java_hash.testHash();
        }
        catch (TEAgentException te)
        {
            te.printStackTrace();
            System.exit(0);
        }
    }
}