Created
April 11, 2015 15:23
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/* | |
* To change this license header, choose License Headers in Project Properties. | |
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* and open the template in the editor. | |
*/ | |
package encryptiontest; | |
import java.io.UnsupportedEncodingException; | |
import java.math.BigInteger; | |
import java.nio.charset.Charset; | |
import java.security.GeneralSecurityException; | |
import java.security.MessageDigest; | |
import java.security.NoSuchAlgorithmException; | |
import java.security.SecureRandom; | |
import java.util.Arrays; | |
import java.util.Base64; | |
import javax.crypto.Cipher; | |
import javax.crypto.spec.SecretKeySpec; | |
public class EncryptionTest { | |
private static final SecureRandom random = new SecureRandom(); | |
public static String nextSessionId() { | |
return new BigInteger(130, random).toString(63); | |
} | |
public static void main(String[] args) throws UnsupportedEncodingException, GeneralSecurityException, Exception { | |
while(true) { | |
String key = nextSessionId(); | |
String source = nextSessionId(); | |
String result = encrypt(getKey(key), source); | |
System.out.println("source = " + source); | |
System.out.println("key = " + key); | |
System.out.println("result = " + result); | |
result = decrypt(getKey(key), result); | |
if (result.equals(source)) { | |
} else { | |
throw new Exception("Fail"); | |
} | |
} | |
} | |
private static String encrypt(byte[] key, String value) throws GeneralSecurityException { | |
// Argument validation. | |
if (key.length != 16) { | |
throw new IllegalArgumentException("Invalid key size."); | |
} | |
// Setup AES tool. | |
SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES"); | |
Cipher cipher = Cipher.getInstance("AES"); | |
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec); | |
// Do the job with AES tool. | |
byte[] original = value.getBytes(Charset.forName("UTF-8")); | |
byte[] binary = cipher.doFinal(original); | |
return Base64.getEncoder().encodeToString(binary); | |
} | |
private static String decrypt(byte[] key, String encrypted) throws GeneralSecurityException { | |
// Argument validation. | |
if (key.length != 16) { | |
throw new IllegalArgumentException("Invalid key size."); | |
} | |
// Setup AES tool. | |
SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES"); | |
Cipher cipher = Cipher.getInstance("AES"); | |
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec); | |
// Do the job with AES tool. | |
byte[] binary = Base64.getDecoder().decode(encrypted); | |
byte[] original = cipher.doFinal(binary); | |
return new String(original, Charset.forName("UTF-8")); | |
} | |
private static byte[] getKey(String string) throws UnsupportedEncodingException, NoSuchAlgorithmException { | |
MessageDigest sha = MessageDigest.getInstance("SHA-1"); | |
byte[] key = sha.digest(string.getBytes("UTF-8")); | |
key = Arrays.copyOf(key, 16); | |
return key; | |
} | |
} |
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