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import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* Basic IO example with CTR using AES
*/
public class MainClass {
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "www.java2java.com".getBytes();
byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
byte[] ivBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x02, 0x03, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01 };
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
System.out.println("input : " + new String(input));
// encryption pass
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
ByteArrayInputStream bIn = new ByteArrayInputStream(input);
CipherInputStream cIn = new CipherInputStream(bIn, cipher);
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
int ch;
while ((ch = cIn.read()) >= 0) {
bOut.write(ch);
}
byte[] cipherText = bOut.toByteArray();
System.out.println("cipher: " + new String(cipherText));
// decryption pass
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
bOut = new ByteArrayOutputStream();
CipherOutputStream cOut = new CipherOutputStream(bOut, cipher);
cOut.write(cipherText);
cOut.close();
System.out.println("plain : " + new String(bOut.toByteArray()));
}
}
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BasicIOexamplewithCTRusingAES.zip( 1,199 k)