我是JAVA的新手。我打算为我的项目构建一个安全系统。但是,我遇到了一个问题。 Eclipse总是指出" java.security.InvalidKeyException:错误的算法:AES或Rijndael需要"。我要将加密密钥保存在数据库中。我检查过钥匙是否正确。唯一的问题是我无法解密密文。谁能告诉我这是什么问题? 实际上,我已经搜索了一些解决方案,但问题仍未解决。 请帮我。非常感谢!
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class AES {
public static void main(String[] args) throws Exception {
String test = "HIHI";
String tmp = null;
SecretKey tempKey1 = generateKey();
saveKey(tempKey1);
SecretKey tempKey2 = loadKey();
tmp = encrypt(test, tempKey1);
String printString = decrypt(tmp, tempKey2);
System.out.println(printString);
}
public static SecretKey generateKey() throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey key = keyGenerator.generateKey();
return key;
}
public static void saveKey(SecretKey key) throws IOException {
String stringKey = Base64.encodeBase64String(key.getEncoded());
System.out.println("stringKey: " + stringKey);
try {
final PreparedStatement pstmt;
// Register the JDBC driver
// for MySQL.
Class.forName("com.mysql.jdbc.Driver");
// Define URL of database
// server for
// database named JunkDB on
// the localhost
// with the default port
// number 3306.
String url = "jdbc:mysql://127.0.0.1:3306/fyp";
// Get a connection to the
// database for a
// user named auser with the
// password
// drowssap, which is
// password spelled
// backwards.
Connection con = DriverManager.getConnection(url, "user", "user");
pstmt = con.prepareStatement("insert into compfyp values (?)");
pstmt.setString(1, stringKey);
pstmt.executeUpdate();
pstmt.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}// end catch
}
public static SecretKey loadKey() throws IOException {
String stringKey = null;
try {
Statement stmt;
ResultSet rs;
// Register the JDBC driver for MySQL
Class.forName("com.mysql.jdbc.Driver");
// Define URL of database server for database named comp2220
String url = "jdbc:mysql://127.0.0.1:3306/fyp";
// Get a connection to the database for a user named user with the
// password userpassword, which is password spelled backwards
Connection con = DriverManager.getConnection(url, "user", "user");
// Get a Statement object
stmt = con.createStatement();
// Get another statement object initialized as shown
stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
// Query the database, storing the result in an object of type
// ResultSet
rs = stmt.executeQuery("SELECT * from compfyp");
// Use the methods of class ResultSet in a loop to display all of
// the data in the database.
while (rs.next()) {
stringKey = rs.getString("encryptionkey");
}// end while loop
con.close();
} catch (Exception e) {
e.printStackTrace();
}
byte[] encodedKey = Base64.decodeBase64(stringKey);
SecretKey trueKey = new SecretKeySpec(encodedKey, 0, encodedKey.length,
"AES/ECB/PKCS5Padding");
System.out.println("after encode & decode secret_key:"
+ Base64.encodeBase64String(trueKey.getEncoded()));
return trueKey;
}
public static String encrypt(String plaintext, SecretKey encryptionKey)
throws Exception {
IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, iv);
byte[] encryptData = cipher.doFinal(plaintext.getBytes());
return encryptData.toString();
}
public static String decrypt(String ciphertext, SecretKey encryptionKey)
throws Exception {
IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
SecretKeySpec spec = new SecretKeySpec(encryptionKey.getEncoded(),
"AES/CBC/PKCS5Padding");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, spec, iv);
byte[] encryptData = ciphertext.getBytes();
;
byte[] original = cipher.doFinal(encryptData);
return new String(original);
}
}
答案 0 :(得分:14)
SecretKeySpec
应该收到“AES”,模式在Cipher
上指定。
我剪了一些代码进行测试。你有:
public class AES {
public static void main(String[] args) throws Exception {
byte[] data = "abcdefghijkl".getBytes();
byte[] tmp = null;
SecretKey tempKey1 = generateKey();
// saveKey(tempKey1);
// SecretKey tempKey2 = loadKey();
tmp = encrypt(data, tempKey1);
byte[] printString = decrypt(tmp, tempKey1);
System.out.println(Arrays.equals(data, printString));
}
public static SecretKey generateKey() throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey key = keyGenerator.generateKey();
return key;
}
public static byte[] encrypt(byte[] data, SecretKey encryptionKey) throws Exception {
IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, iv);
byte[] encryptData = cipher.doFinal(data);
return encryptData;
}
public static byte[] decrypt(byte[] tmp, SecretKey encryptionKey) throws Exception {
IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
SecretKeySpec spec = new SecretKeySpec(encryptionKey.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, spec, iv);
System.out.println(tmp.length);
return cipher.doFinal(tmp);
}
}
一个额外的细节:使用base64作为加密数据而不是String ...