使用AES的Java加密
我正在尝试使用AES类创建加密系统:使用AES的Java加密,java,encryption,Java,Encryption,我正在尝试使用AES类创建加密系统: package Source; import java.security.MessageDigest; import java.util.Arrays; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import javax.crypto.spec.IvParameterSpec; import
package Source;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class AES {
static String IV = "AAAAAAAAAAAAAAAA";
static String plaintext = "test text 123\0\0\0"; /*Note null padding*/
static String encryptionKey = "H4tch4repratygonetowil5h4kers";
public static void main(String [] args) {
try {
System.out.println("==Java==");
System.out.println("plain: " + plaintext);
byte[] cipher = encrypt(plaintext, encryptionKey);
System.out.print("cipher: ");
for (int i=0; i<cipher.length; i++)
System.out.print(new Integer(cipher[i])+" ");
System.out.println("");
String decrypted = decrypt(cipher, encryptionKey);
System.out.println("decrypt: " + decrypted);
} catch (Exception e) {
e.printStackTrace();
}
}
public static byte[] encrypt(String plainText, String encryptionKey) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return cipher.doFinal(plainText.getBytes("UTF-8"));
}
private static String decrypt(byte[] cipherText, String encryptionKey) throws Exception{
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return new String(cipher.doFinal(cipherText),"UTF-8");
}
}
如何使变量'str'实际具有加密文本的值?在运行时,我得到错误和一个空字段。。。可以将字节[]更改为字符串吗
更新错误:
java.lang.IllegalArgumentException:空键
在javax.crypto.spec.SecretKeySpec.(SecretKeySpec.java:96)
在Source.AES.encrypt(AES.java:41)
最初$2.actionPerformed(first.java:62)
在javax.swing.AbstractButton.fireActionPerformed(未知源)
位于javax.swing.AbstractButton$Handler.actionPerformed(未知源)
在javax.swing.DefaultButtonModel.fireActionPerformed(未知源)
位于javax.swing.DefaultButtonModel.setPressed(未知源)
位于javax.swing.plaf.basic.BasicButtonListener.mouseReleased(未知源代码)
位于java.awt.Component.ProcessMouseeEvent(未知源)
位于javax.swing.JComponent.ProcessMouseeEvent(未知源)
位于java.awt.Component.processEvent(未知源)
位于java.awt.Container.processEvent(未知源)
位于java.awt.Component.dispatchEventImpl(未知源)
位于java.awt.Container.dispatchEventImpl(未知源)
位于java.awt.Component.dispatchEvent(未知源)
位于java.awt.LightweightDispatcher.RetargetMouseeEvent(未知源)
位于java.awt.LightweightDispatcher.ProcessMouseeEvent(未知源)
位于java.awt.LightweightDispatcher.dispatchEvent(未知源)
位于java.awt.Container.dispatchEventImpl(未知源)
位于java.awt.Window.dispatchEventImpl(未知源)
位于java.awt.Component.dispatchEvent(未知源)
位于java.awt.EventQueue.dispatchEventImpl(未知源)
位于java.awt.EventQueue.access$500(未知源)
在java.awt.EventQueue$3.run处(未知源)
在java.awt.EventQueue$3.run处(未知源)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(未知源)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(未知源)
在java.awt.EventQueue$4.run处(未知源)
在java.awt.EventQueue$4.run处(未知源)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(未知源)
位于java.awt.EventQueue.dispatchEvent(未知源)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(未知源)
位于java.awt.EventDispatchThread.pumpEventsForFilter(未知源)
位于java.awt.EventDispatchThread.pumpEventsForHierarchy(未知源)
位于java.awt.EventDispatchThread.pumpEvents(未知源)
位于java.awt.EventDispatchThread.pumpEvents(未知源)
位于java.awt.EventDispatchThread.run(未知源)
这里有几个问题
空密钥
异常,因为您没有输入任何密码无效AES密钥长度:8字节
,因为密钥应为特定长度(请参阅更多信息)javax.crypto.IllegalBlockSizeException:输入长度不是16字节的倍数,因为加密模式不使用填充。您可以将其更改为类似于AES/CBC/pkcs5pdadding
public static byte[] encrypt(String plainText, String encryptionKey) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
byte [] hashedPassword = sha.digest(encryptionKey.getBytes("UTF-8"));
hashedPassword = Arrays.copyOf(hashedPassword, 16);
SecretKeySpec key = new SecretKeySpec(hashedPassword, "AES");
cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return cipher.doFinal(plainText.getBytes("UTF-8"));
}
(*)当然,为了解密消息,您还必须对“decrypt”方法进行类似的更改 你得到的运行时错误是什么?我已经根据错误更新了我的帖子,似乎
SecretKeySpec
Constructor有问题一般建议:请不要使用固定的IV。IV是一个非机密值,在加密过程中新生成时,应该提供语义安全性。因为它不是秘密,所以可以和密文一起发送。一种常见的方法是在加密期间将其预编到密文中,并在解密期间将其切掉。
public static byte[] encrypt(String plainText, String encryptionKey) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
byte [] hashedPassword = sha.digest(encryptionKey.getBytes("UTF-8"));
hashedPassword = Arrays.copyOf(hashedPassword, 16);
SecretKeySpec key = new SecretKeySpec(hashedPassword, "AES");
cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return cipher.doFinal(plainText.getBytes("UTF-8"));
}