我正在制作一个读取加密文件的Java程序,并且在密钥的帮助下,它将对其进行解密。我正在使用这个AES Encryption算法,因为它提供了我也需要的代码。
我所做的是将Java类复制到我的项目中。这就是我的AES.java
文件的样子:
public class AES{
private static SecretKeySpec secretKey ;
private static byte[] key ;
private static String decryptedString;
private static String encryptedString;
public static void setKey(String myKey){
MessageDigest sha = null;
try {
key = myKey.getBytes("UTF-8");
System.out.println(key.length);
sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key, 16); // use only first 128 bit
System.out.println(key.length);
System.out.println(new String(key,"UTF-8"));
secretKey = new SecretKeySpec(key, "AES");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String getDecryptedString() {
return decryptedString;
}
public static void setDecryptedString(String decryptedString) {
AES.decryptedString = decryptedString;
}
public static String getEncryptedString() {
return encryptedString;
}
public static void setEncryptedString(String encryptedString) {
AES.encryptedString = encryptedString;
}
public static String encrypt(String strToEncrypt){
try{
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
// byte[] encodedBytes = Base64.getEncoder().encode(strToEncrypt.getBytes("UTF-8"));
// setEncryptedString(new String(encodedBytes));
}
catch (Exception e)
{
System.out.println("Error while encrypting: "+e.toString());
}
return null;
}
public static String decrypt(String strToDecrypt){
try{
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));
//setDecryptedString(new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt))));
}
catch (Exception e){
System.out.println("Error while decrypting: "+e.toString());
}
return null;
}
public static void main(String args[]){
final String strToEncrypt = "My text to encrypt";
final String strPssword = "encryptor key";
AES.setKey(strPssword);
AES.encrypt(strToEncrypt.trim());
System.out.println("String to Encrypt: " + strToEncrypt);
System.out.println("Encrypted: " + AES.getEncryptedString());
final String strToDecrypt = AES.getEncryptedString();
AES.decrypt(strToDecrypt.trim());
System.out.println("String To Decrypt : " + strToDecrypt);
System.out.println("Decrypted : " + AES.getDecryptedString());
}
}
在我的Main.java
课程中:我有以下内容:
//I get my encoded input as a FileInputStream
InputStream encodedInput = null;
encodedInput = new FileInputStream("./Config/config2.properties");
//get the input and then convert to Bytes then to String
//I also tried converting to String right away
byte[] inputBytes = IOUtils.toByteArray(encodedInput);
String theString = IOUtils.toString(inputBytes, "UTF-8"); //IOUtils.toString(encodedInput, "UTF-8");
System.out.println("Input string (encoded) = " + theString);
//It stops at the decrypt call and throw the exception
AES.setKey(localProperties.getKey());
AES.decrypt(theString.trim());
String decrypted = AES.getDecryptedString();
如您所见,获取我文件的内容。内容是正确的,因为我也在系统日志中打印它们。
但我无法弄清楚的是,即使函数要求String作为输入,解密函数也无法解密它。
我真的傻眼了,我不知道从哪里开始。
答案 0 :(得分:2)
public static String decrypt(String strToDecrypt){
问题出在这里。此方法应接受byte[]
参数。您已将密文作为byte[]
数组。你毫无意义地将它转换为String
,只需将其转换回此方法。往返不是无损的。只需将其传递为byte[]
数组。
String
不是二进制数据的容器。