Java Cryptography by Jonathan Knudsen
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To and Fro
Most of the remaining javakey options deal with exchanging keys and certificates to and from files. These are summarized, along with the rest of javakey ’s options, in Table 4.1. Parameters in square brackets are optional.
This option creates an identity with the given name. The trust parameter should be either “true” or “false.” If it is not present, false is the default.
This option is the same as -c , except it creates a signer instead of an identity.
You can use this option to change the trust status of the named identity or signer. The trust parameter should be “true” or “false.”
You can enter additional information about an identity or signer using this option.
Use this option to remove an identity or signer from the database.
-gk signer algorithm keysize [pubfile [privfile]]
This option, which can be abbreviated -g , generates a key pair for the named signer. It generates a key pair for the given algorithm name and strength. The pubfile and privfile parameters, if specified, are used as filenames to contain the newly generated public and private keys.
Use this option to see the contents of the javakey database.
This option is the same as -l but shows more detail.
This option displays details about the named identity or signer.
Use this option to generate a .
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How to convert a String to and fro from UTF8 byte array
Following example will showcase conversion of a Unicode String to UTF8 byte[] and UTF8 byte[] to Unicode byte[] using Reader and Writer classes.
Example
IOTester.java
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.io.Writer; import java.nio.charset.Charset; import java.text.ParseException; public class I18NTester < public static void main(String[] args) throws ParseException, IOException < String input = "This is a sample text" ; InputStream inputStream = new ByteArrayInputStream(input.getBytes()); //get the UTF-8 data Reader reader = new InputStreamReader(inputStream, Charset.forName("UTF-8")); //convert UTF-8 to Unicode int data = reader.read(); while(data != -1)< char theChar = (char) data; System.out.print(theChar); data = reader.read(); >reader.close(); System.out.println(); //Convert Unicode to UTF-8 Bytes ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); Writer writer = new OutputStreamWriter(outputStream, Charset.forName("UTF-8")); writer.write(input); writer.close(); String out = new String(outputStream.toByteArray()); System.out.println(out); > > Output
It will print the following result. This is a sample text This is a sample text