Java Can';t还原私钥RSA
我有一个关于java加密的问题。 我从用户那里获取密码,然后生成私钥和公钥。从公钥我创建密码,然后存储私钥和密码 然后,从第二个应用程序中,我再次从用户、密码文件和私钥读取密码,然后尝试将密码与密码和私钥的解密匹配Java Can';t还原私钥RSA,java,security,encryption,rsa,private-key,Java,Security,Encryption,Rsa,Private Key,我有一个关于java加密的问题。 我从用户那里获取密码,然后生成私钥和公钥。从公钥我创建密码,然后存储私钥和密码 然后,从第二个应用程序中,我再次从用户、密码文件和私钥读取密码,然后尝试将密码与密码和私钥的解密匹配 我的第一份申请: private static byte[] encrypt(byte[] inpBytes, PublicKey key, String xform) throws Exception { Cipher cipher = Cipher.getInstance(x
我的第一份申请:
private static byte[] encrypt(byte[] inpBytes, PublicKey key,
String xform) throws Exception {
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
String xform = "RSA";
// Generate a key-pair
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
kpg.initialize(512); // 512 is the keysize.
KeyPair kp = kpg.generateKeyPair();
/create public and private key
PublicKey pubk = kp.getPublic();
PrivateKey prvk = kp.getPrivate();
//password from user
String password = T_Password.getText();
byte[] dataBytes = password.getBytes();
//create cipher
byte[] encBytes = null;
try {
encBytes = encrypt(dataBytes, pubk, xform);
} catch (Exception ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
//storing
//cipher
FileOutputStream cipher = null;
try {
cipher = new FileOutputStream( "Xrhstes\\"+T_Username.getText()+"\\hash_"+T_Username.getText());
cipher.write(encBytes);//write with bytes
cipher.close();
} catch (IOException ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
//private key
byte[] key2 = prvk.getEncoded();
FileOutputStream keyfos2 = null;
try {
keyfos2 = new FileOutputStream("Xrhstes\\"+T_Username.getText()+"\\private_"+ T_Username.getText()+".pem");
keyfos2.write(key2);
keyfos2.close();
private static byte[] decrypt(byte[] inpBytes, PrivateKey key,String xform) throws Exception{
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
//fetch private key
byte[] prvk1 = new byte[(int)new File("C:\\...\\"+T_Username.getText()+"\\private_"+ T_Username.getText()).length()];
//make it from bytes to private key
KeyFactory kf= KeyFactory.getInstance("RSA");
PrivateKey prvk=kf.generatePrivate(new PKCS8EncodedKeySpec(prvk1));
//fetch cipher
byte[] encBytes = new byte[(int)new File("C:\\...\\"+T_Username.getText()+"\\hash_"+ T_Username.getText()).length()];
//decrypt with our password given from user
String xform = "RSA";
byte[] decBytes = decrypt(encBytes,prvk, xform);
boolean expected = java.util.Arrays.equals(password, decBytes);
System.out.println("Test " + (expected ? "SUCCEEDED!" : "FAILED!"));
这是第二个应用程序:
private static byte[] encrypt(byte[] inpBytes, PublicKey key,
String xform) throws Exception {
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
String xform = "RSA";
// Generate a key-pair
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
kpg.initialize(512); // 512 is the keysize.
KeyPair kp = kpg.generateKeyPair();
/create public and private key
PublicKey pubk = kp.getPublic();
PrivateKey prvk = kp.getPrivate();
//password from user
String password = T_Password.getText();
byte[] dataBytes = password.getBytes();
//create cipher
byte[] encBytes = null;
try {
encBytes = encrypt(dataBytes, pubk, xform);
} catch (Exception ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
//storing
//cipher
FileOutputStream cipher = null;
try {
cipher = new FileOutputStream( "Xrhstes\\"+T_Username.getText()+"\\hash_"+T_Username.getText());
cipher.write(encBytes);//write with bytes
cipher.close();
} catch (IOException ex) {
Logger.getLogger(Efarmogi_1.class.getName()).log(Level.SEVERE, null, ex);
}
//private key
byte[] key2 = prvk.getEncoded();
FileOutputStream keyfos2 = null;
try {
keyfos2 = new FileOutputStream("Xrhstes\\"+T_Username.getText()+"\\private_"+ T_Username.getText()+".pem");
keyfos2.write(key2);
keyfos2.close();
private static byte[] decrypt(byte[] inpBytes, PrivateKey key,String xform) throws Exception{
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
//fetch private key
byte[] prvk1 = new byte[(int)new File("C:\\...\\"+T_Username.getText()+"\\private_"+ T_Username.getText()).length()];
//make it from bytes to private key
KeyFactory kf= KeyFactory.getInstance("RSA");
PrivateKey prvk=kf.generatePrivate(new PKCS8EncodedKeySpec(prvk1));
//fetch cipher
byte[] encBytes = new byte[(int)new File("C:\\...\\"+T_Username.getText()+"\\hash_"+ T_Username.getText()).length()];
//decrypt with our password given from user
String xform = "RSA";
byte[] decBytes = decrypt(encBytes,prvk, xform);
boolean expected = java.util.Arrays.equals(password, decBytes);
System.out.println("Test " + (expected ? "SUCCEEDED!" : "FAILED!"));
我的问题是,当我尝试重新转换保存的字节时,返回到privateKey时,我遇到多个错误,即密钥类型无效(问题始于解码PKCS8EncodedKeySpec,注意到密钥规范无效)。我尝试了许多方法,但仍然是一样的,有人能告诉我我的错误在哪里吗?提前感谢 使用以下行:
byte[] prvk1 = new byte[(int)new File("C:\\...\\"+T_Username.getText()+"\\private_"+ T_Username.getText()).length()];
及
实际上,您创建了两个空字节数组。您仅使用File.length()
指示数组的大小,这显然是不正确的。在实际读取文件后重试,例如使用方法(需要Java 8或更高版本)