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Secure string pairs
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.xml.bind.DatatypeConverter;
public class StringHider
{
/**
* Generate pairs by doing:
* <p><code>
* SECRET=The secret to encode; SALT=$(pwgen 64); echo ${SALT}; echo -n ${SALT}${SECRET} | sha256sum | cut -d' ' -f1
* </code>
*/
private static final String[][] myStringPairs =
{
{ "etheihee1Pai4uuc4shoh3Uacheil9chu1uemieQuoB0IechahGeilo8meeth2Ze", "7005a45764cca26f1cce77830245f642b47ac55ea5dfd198cbad44f627ec9576" },
};
private static final MessageDigest md;
static
{
try
{
md = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException e)
{
throw new RuntimeException("WOT?", e);
}
}
public static boolean matches(String input)
{
byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8);
for (String[] pair : myStringPairs)
{
byte[] sha256 = DatatypeConverter.parseHexBinary(pair[1]);
String sha256s = DatatypeConverter.printHexBinary(sha256);
md.reset();
md.update(pair[0].getBytes(StandardCharsets.US_ASCII));
md.update(inputBytes);
byte[] digest = md.digest();
String string = DatatypeConverter.printHexBinary(digest);
boolean result = MessageDigest.isEqual(sha256, digest);
System.out.println("Digest " + string.length() + " " + string+ " " + result);
System.out.println("SHA " + sha256s.length() + " " + sha256s + " " + result);
if (result) return true;
}
return false;
}
public static void main(String[] args)
{
System.out.println("Matches '" + args[0] + "' " + matches(args[0]));
}
}
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