Java:编写和读取基于密码的加密私钥 [英] Java: write and read password based encrypted private key
问题描述
我正在尝试从文件中读取基于密码的加密私钥,但是我收到以下异常:
I am trying to read a password based encrypted private key from a file, but I'm getting the following exception:
java.io.IOException: DerInputStream.getLength(): lengthTag=109, too big.
at sun.security.util.DerInputStream.getLength(DerInputStream.java:561)
at sun.security.util.DerValue.init(DerValue.java:365)
at sun.security.util.DerValue.<init>(DerValue.java:294)
at javax.crypto.EncryptedPrivateKeyInfo.<init>(EncryptedPrivateKeyInfo.java:84) ...
这是我如何加密和写入文件的私钥:
This is how I encrypt and write to file the private key:
public static void savePrivateKeyToDisk(PrivateKey privateKey, String passord){
try {
// unencrypted PKCS#8 private key
byte[] encodedPrivateKey = privateKey.getEncoded();
String MYPBEALG = "PBEWithSHA1AndDESede";
int count = 20;
SecureRandom random = new SecureRandom();
byte[] salt = new byte[8];
random.nextBytes(salt);
// Create PBE parameter set
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, count);
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(MYPBEALG);
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
Cipher pbeCipher = Cipher.getInstance(MYPBEALG);
// Initialize PBE Cipher with key and parameters
pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);
// Encrypt the encoded Private Key with the PBE key
byte[] cipherText = pbeCipher.doFinal(encodedPrivateKey);
// Now construct PKCS #8 EncryptedPrivateKeyInfo object
AlgorithmParameters algparms = AlgorithmParameters.getInstance(MYPBEALG);
algparms.init(pbeParamSpec);
EncryptedPrivateKeyInfo encinfo = new EncryptedPrivateKeyInfo(algparms, cipherText);
// DER encoded PKCS#8 encrypted key
byte[] encryptedPkcs8 = encinfo.getEncoded();
File encryptedPrivate = new File(PRIVATE_KEY_FILE);
if (encryptedPrivate.getParentFile() != null) {
encryptedPrivate.getParentFile().mkdirs();
}
encryptedPrivate.createNewFile();
ObjectOutputStream publicKeyOS = new ObjectOutputStream(
new FileOutputStream(encryptedPrivate));
publicKeyOS.writeObject(encryptedPkcs8);
publicKeyOS.close();
}
catch (Exception e){
e.printStackTrace();
}
}
...这是我如何尝试阅读加密的私钥:
... and this is how I'm trying to read the encrypted private key:
public static PrivateKey getPrivateKey(String passwd){
try {
byte[] encodedPrivateKey = getFileBytes(PRIVATE_KEY_FILE);
// exception thrown from here
EncryptedPrivateKeyInfo encryptPKInfo = new EncryptedPrivateKeyInfo(encodedPrivateKey);
Cipher cipher = Cipher.getInstance(encryptPKInfo.getAlgName());
PBEKeySpec pbeKeySpec = new PBEKeySpec(passwd.toCharArray());
SecretKeyFactory secFac = SecretKeyFactory.getInstance(encryptPKInfo.getAlgName());
Key pbeKey = secFac.generateSecret(pbeKeySpec);
AlgorithmParameters algParams = encryptPKInfo.getAlgParameters();
cipher.init(Cipher.DECRYPT_MODE, pbeKey, algParams);
KeySpec pkcs8KeySpec = encryptPKInfo.getKeySpec(cipher);
KeyFactory kf = KeyFactory.getInstance(ALGORITHM);
return kf.generatePrivate(pkcs8KeySpec);
}
catch (Exception e){
e.printStackTrace();
return null;
}
}
... getFileBytes方法:
... the getFileBytes method:
private static byte[] getFileBytes(String infile){
File f = new File(infile) ;
int sizecontent = ((int) f.length());
byte[] data = new byte[sizecontent];
try
{
FileInputStream freader = new FileInputStream(f);
freader.read(data, 0, sizecontent) ;
freader.close();
return data;
}
catch(IOException ioe)
{
System.out.println(ioe.toString());
return null;
}
}
似乎加密的私钥不在正确的格式,但我保存在DER PKCS#8格式。
所以问题:这段代码有什么错误?
It seems like the encrypted private key is not in the right format, but I save it in DER PKCS#8 format. So, the question: What is the mistake in this code?
推荐答案
我猜问题是你写的一个对象
,但是您读取 byte []
(而不是 Object
)
我建议您读取整个对象,然后获取所需的字节,甚至更好地直接写入 byte []
(不要使用 ObjectOutputStream
),然后加载这些字节,例如:
I guess the problem is that you write an Object
, but then you read byte[]
(not an Object
)
I would suggest that you either read the whole object and then get the required bytes or even better write byte[]
directly (don't use ObjectOutputStream
) and then load these bytes, eg:
FileOutputStream fos = new FileOutputStream(PRIVATE_KEY_FILE);
fos.write(myByteArray);
fos.close();
然后检索:
byte[] bytes = Files.readAllBytes(Paths.get(PRIVATE_KEY_FILE));
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