[英]Java Encryption: Loading a symmetric key from file
所以最近我开始使用加密。 我有一个正常运行的非对称加密类,但是我也需要一个对称密钥类。 尽管对称密钥类的大多数方面都可以使用,但是不能从编码字节中加载密钥。 以下是对称密钥类。 我已经标记了两个无效的构造函数。
public class PlasmaSymmetricEncrypter {
public static String DESEDE_ALGORITHM = "DESede";
public static String AES_ALGORITHM = "AES";
private Key key;
private String algorithm;
public PlasmaSymmetricEncrypter(Key key) {
this.key = key;
this.algorithm = key.getAlgorithm();
}
public PlasmaSymmetricEncrypter(File keyFile, String algorithm) throws IOException, NoSuchAlgorithmException { //This constructor is not working
this.algorithm = algorithm;
if(!keyFile.exists()) {
this.genKey(keyFile);
}
Key key = new SecretKeySpec(Files.readAllBytes(keyFile.toPath()), algorithm);
this.key = key;
}
public PlasmaSymmetricEncrypter(byte[] key, String algorithm) { //This constructor is not working
this(new SecretKeySpec(key, algorithm));
}
private void genKey(File file) throws NoSuchAlgorithmException, IOException {
KeyGenerator generator = KeyGenerator.getInstance(this.algorithm);
this.key = generator.generateKey();
file.delete();
if(file.getParentFile() != null) {
file.getParentFile().mkdirs();
}
file.createNewFile();
FileOutputStream stream = new FileOutputStream(file);
stream.write(this.getEncodedKey());
stream.close();
}
public byte[] getEncodedKey() {
return this.key.getEncoded();
}
public byte[] encrypt(byte[] bytes) throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException {
Cipher cipher = Cipher.getInstance(this.algorithm);
cipher.init(Cipher.ENCRYPT_MODE, this.key);
return cipher.doFinal(bytes);
}
public byte[] encrypt(String text) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
return this.encrypt(text.getBytes(StandardCharsets.UTF_8));
}
public String decrypt(byte[] bytes) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
Cipher cipher = Cipher.getInstance(this.algorithm);
cipher.init(Cipher.DECRYPT_MODE, this.key);
return new String(cipher.doFinal(bytes), StandardCharsets.UTF_8);
}
public String decrypt(String bytes) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
return this.decrypt(bytes.getBytes(StandardCharsets.ISO_8859_1));
}
public String encryptToString(String text) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
return new String(this.encrypt(text), StandardCharsets.ISO_8859_1);
}
}
使用以下测试代码运行会产生java.security.InvalidKeyException
:
PlasmaAsymmetricEncrypter asymmetricEncrypter = new PlasmaAsymmetricEncrypter(new File("private.key"), new File("public.key"), PlasmaAsymmetricEncrypter.RSA_ALGORITHM);
PlasmaSymmetricEncrypter symmetricEncrypter = new PlasmaSymmetricEncrypter(new File("secret.key"), PlasmaSymmetricEncrypter.AES_ALGORITHM);
String encrypt = "hello world";
byte[] encryptedKey = asymmetricEncrypter.encryptPrivate(symmetricEncrypter.getEncodedKey());
PlasmaSymmetricEncrypter encrypter = new PlasmaSymmetricEncrypter(asymmetricEncrypter.decryptPublic(encryptedKey), PlasmaAsymmetricEncrypter.RSA_ALGORITHM);
System.out.println(encrypter.decrypt(symmetricEncrypter.encrypt(encrypt)));
例外:
Exception in thread "main" java.security.InvalidKeyException: No installed provider supports this key: javax.crypto.spec.SecretKeySpec
at javax.crypto.Cipher.chooseProvider(Cipher.java:893)
at javax.crypto.Cipher.init(Cipher.java:1249)
at javax.crypto.Cipher.init(Cipher.java:1186)
at com.gmail.socraticphoenix.plasma.file.encryption.PlasmaSymmetricEncrypter.decrypt(PlasmaSymmetricEncrypter.java:96)
at com.gmail.socraticphoenix.plasma.Test.main(Test.java:38)
测试38是System.out.println
调用,而PlasmaSymmetricEncrypter 96在此处
我所有的代码都在github上
为清楚起见,进行编辑:1.请忽略“加密为字符串”方法,一旦我解决了这个问题,它们将被base64编码替换。 2.该错误不会在构造函数本身中发生,仅当我尝试获取重构密钥的密码时才会抛出该错误。
所以,我很傻。
在测试代码中,我正在像这样构造SymmetricEncrypter:
PlasmaSymmetricEncrypter encrypter = new PlasmaSymmetricEncrypter(asymmetricEncrypter.decryptPublic(encryptedKey), PlasmaAsymmetricEncrypter.RSA_ALGORITHM);
使用RSA算法,该算法当然不适用于对称密钥。
多亏了那些试图提供帮助的人,但最终导致失败的是我的测试代码,而不是该类。
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