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Java AES Encryption Example

This Java code sample demonstrates how to encrypt and decrypt a string using AES symmetric encryption. It generates an AES secret key, uses it to encrypt a message into bytes, then decrypts the bytes back into the original string. The encrypted and original bytes are also printed as hexadecimal strings for viewing.

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rajubomma
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48 views2 pages

Java AES Encryption Example

This Java code sample demonstrates how to encrypt and decrypt a string using AES symmetric encryption. It generates an AES secret key, uses it to encrypt a message into bytes, then decrypts the bytes back into the original string. The encrypted and original bytes are also printed as hexadecimal strings for viewing.

Uploaded by

rajubomma
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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import java.security.

*;
import javax.crypto.*;
import
javax.crypto.spec.*;
import java.io.*;
public class AES {
public static String asHex (byte buf[]) {

StringBuffer strbuf = new StringBuffer(buf.length*2);

int i;
for (i = 0; i < buf.length; i++)
{
if (((int) buf[i] & 0xff) < 0x10)
strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
} return strbuf.toString(); }
public static void main(String[] args) throws Exception
{ String message="AES still rocks!!";
/ / Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); / / 192 and 256 bits may not be availab le
/ / Generate the secret key specs.
SecretKey skey =
kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
/ / Instantiate the cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal((args.length == 0 ? message :

args[0]).getBytes()); System.out.println("encrypted string: " +


asHex(encrypted)); cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] original = cipher.doFinal(encrypted);
String originalString = new String(original);
System.out.println("Original string: " +originalString + " " + asHex(original));
}
}

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