我正在尝试在j2me中进行AES加密.我使用几乎相同的
android代码,它在那里工作正常.以下是代码块.我输出为null
package cartoon;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class MCrypt {
private String iv = "0123456789abcdef";// iv
private IvParameterSpec ivspec;
private SecretKeySpec keyspec;
private Cipher cipher;
private String SecretKey = "fedcba9876543210";// secretKey
public MCrypt() {
ivspec = new IvParameterSpec(iv.getBytes(),iv.getBytes().length);
keyspec = new SecretKeySpec(SecretKey.getBytes(),iv.getBytes().length,"AES");
}
String Decrypt(String text) throws Exception {
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE,keyspec,ivspec);
byte[] results = null;
int results1 = cipher.doFinal(Base64.decode(text),Base64.decode(text).length,results,0);
System.out.println("String resultssssssssssssss " + results1);
return new String(results,"UTF-8");
}
String Encrypt(String text)
throws Exception {
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
System.out.println("String input : " + text);
cipher.init(Cipher.ENCRYPT_MODE,ivspec);
byte[] results = null;
int results1 = cipher.doFinal(text.getBytes(),text.getBytes().length,0);
return Base64.encode(results);
}
}
打印结果
MCrypt mcrypt = new MCrypt();
try {
encrypted = mcrypt.Encrypt("id=450");
decrypted = new String(mcrypt.Decrypt(encrypted));
System.out.println("Encrypted Text : " + encrypted);
System.out.println("Decrypted Text : " + decrypted);
} catch (Exception e) {
e.printStackTrace();
}
我哪里错了？
解决方法
请尝试以下方法
您应该首先适当地初始化字节数组
String Decrypt(String text) throws Exception {
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE,ivspec);
// here
byte[] results = cipher.doFinal(Base64.decode(text));
int results1 = cipher.doFinal(Base64.decode(text),"UTF-8");
}
String Encrypt(String text)
throws Exception {
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
System.out.println("String input : " + text);
cipher.init(Cipher.ENCRYPT_MODE,ivspec);
// and here
byte[] results = cipher.doFinal(text.getBytes());
int results1 = cipher.doFinal(text.getBytes(),0);
return Base64.encode(results);
}
