- Using BASE 64
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class EncryptDecrypt {
static String key = "VANSILmangalXBB7LDUGNQ=="; // 24 chars
public static SecretKey getSecretKey(String key) {
byte[] decodedKey = Base64.decodeBase64(key);
SecretKey secretKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
return secretKey;
}
public static String encryptAES(String plainText, String key)
throws Exception {
SecretKey secretKey = getSecretKey(key);
byte[] plainTextByte = plainText.getBytes();
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedByte = cipher.doFinal(plainTextByte);
String encryptedText = Base64.encodeBase64String(encryptedByte);
return encryptedText;
}
public static String decryptAES(String encryptedText, String key)
throws Exception {
SecretKey secretKey = getSecretKey(key);
byte[] encryptedTextByte = Base64.decodeBase64(encryptedText);
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decryptedByte = cipher.doFinal(encryptedTextByte);
String decryptedText = new String(decryptedByte);
return decryptedText;
}
public static void main(String[] args) throws Exception {
System.out.println(sampleData);
String encryptMsg = encryptAES(sampleData, key);
System.out.println(encryptMsg);
String decryptMsg = decryptAES(encryptMsg, key);
System.out.println(decryptMsg);
System.out.println("After decrypt, sample and decrypt msg must be equal ?? "+sampleData.equalsIgnoreCase(decryptMsg));
}
static String sampleData = "Hello friends";
}
Output:
Hello friends
UyTO3kyEjo+okLSoi+tm+Q==
Hello friends
After decrypt, sample and decrypt msg must be equal ?? true
- Using Hash String
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class HashString {
public static final String ALGO_SHA_256 = "SHA-256";
public static final String ALGO_SHA_1 = "SHA-1";
public static final String ALGO_MD5 = "MD5";
public static final String ALGO_DEFAULT = "SHA-256";
public static String getMd5HashString(String password) {
String hashString;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(StandardCharsets.UTF_8.encode(password));
hashString = String.format("%032x", new BigInteger(1, md5.digest()));
} catch (NoSuchAlgorithmException e) {
hashString = String.valueOf(password.hashCode());
}
return hashString;
}
public static String getMd5HashString2(String password) {
byte[] hashBytes = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
hashBytes = md.digest(password.getBytes());
} catch (NoSuchAlgorithmException e) {
e.getMessage();
}
StringBuilder hashedString = new StringBuilder();
for (int i = 0; i < hashBytes.length; ++i) {
String hex = Integer.toHexString(hashBytes[i]);
if (hex.length() == 1) {
hashedString.append(0);
hashedString.append(hex.charAt(hex.length() - 1));
} else {
hashedString.append(hex.substring(hex.length() - 2));
}
}
return hashedString.toString();
}
public static String generateHashString(String algo, String data) throws NoSuchAlgorithmException {
if (data.isEmpty()) {
return null;
} else {
MessageDigest messageDigest = MessageDigest.getInstance(algo);
byte[] result = messageDigest.digest(data.getBytes());
StringBuffer stringBuffer = new StringBuffer();
byte[] var5 = result;
int var6 = result.length;
for (int var7 = 0; var7 < var6; ++var7) {
byte bytes = var5[var7];
stringBuffer.append(String.format("%02x", bytes & 255));
}
return stringBuffer.toString();
}
}
public static void main(String[] args) throws NoSuchAlgorithmException {
String md5HashString = getMd5HashString("mangal@123");
String md5HashString2 = getMd5HashString2("mangal@123");
// can be used any ALGO
String hashMsg = generateHashString(ALGO_SHA_256, "mangal@123");
System.out.println(md5HashString);
System.out.println(md5HashString2);
System.out.println(hashMsg);
}
}
Output:
05eafeb211bbf7925eeba00fc8e44f15
05eafeb211bbf7925eeba00fc8e44f15
a0e85e4e1b48ef45e28ba049f3490c3a73f9f33dce6ec256d413ae5c777d4c2d
