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Copy pathUUIDUtils.java
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66 lines (54 loc) · 1.58 KB
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package codingTest;
import java.math.BigInteger;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Date;
import java.util.Random;
import java.util.UUID;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
public class UUIDUtils {
public static void main() {
System.out.println(generateUUID());
}
static public String generateUUID() {
return UUID.randomUUID().toString();
}
static public String generateSecret() {
// KeyGenerator generator = KeyGenerator.getInstance("AES");
// SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
// generator.init(256, random); /* 256-bit AES */
// SecretKey secretKey = generator.generateKey();
PBEKeySpec keySpec = new PBEKeySpec(UUIDUtils.generateUUID().toCharArray());
SecretKeyFactory keyFactory = null;
try {
keyFactory = SecretKeyFactory.getInstance("PBE");
} catch (NoSuchAlgorithmException e) {
return null;
}
Key secretKey;
try {
secretKey = keyFactory.generateSecret( keySpec );
} catch (InvalidKeySpecException e) {
return null;
}
byte[] binary = secretKey.getEncoded();
String secret = String.format("%032X", new BigInteger(+1, binary));
return secret;
}
/**
* 랜덤숫자를 생성한다.
* @param length
* @return
*/
static public String createRandomNumber(int length) {
Random rd = new Random();
rd.setSeed(new Date().getTime());
StringBuffer sb = new StringBuffer();
for(int i = 0; i < length; i++) {
sb.append(rd.nextInt(10));
}
return sb.toString();
}
}