如何使用Java加密/解密文件中的文本 [英] How to Encrypt/Decrypt text in a file in Java
问题描述
我的代码有问题，例如，当我加密数据时，例如，这种情况下，我使用接收者的公共密钥加密了模拟密钥，然后在读取该文本文件并尝试尝试将其保存到文本文件时，使用接收者的私钥对其解密，我得到了另一个密钥，因此无法使用它来解密加密的消息.
I have a problem with my code, when I encrypt data, for example, in this case, the simmetric key I encrypted with the receiver's public key, then saved to a text file, when I read that text file and try to decrypt it, using the receiver's private key, I get a different key, therefore I cannot use it to decrypt the encrypted message.
发件人代码:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
class Sender{
public static void main(String[] args) {
//infile.txt
File inFile = new File(args[0]);
//outfile.txt
File outFile = new File(args[1]);
//mykeystore.jks
File keyStoreFile = new File(args[2]);
//mykeystore info
String alias = args[3];
String password = args[4];
String storepass = args[5];
//receptor certificate
String receptorCert = args[6];
try {
//Read plain text
FileInputStream rawDataFromFile = new FileInputStream(inFile);
byte[] plainText = new byte[(int) inFile.length()];
rawDataFromFile.read(plainText);
//Create simmetric key
String key = "Bar12345Bar12345"; // 128 bit key
String initVector = "RandomInitVector"; // 16 bytes IV
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
//Encrypt plaintext
byte[] ciphertext = cipher.doFinal(plainText);
//Hash plaintext
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(plainText);
byte[] digest = md.digest();
//Encrypt simmetric key with receiver's public key
Cipher rsaCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
PublicKey receptorPublicKey = getPublicKeyFromCert(receptorCert);
rsaCipher.init(Cipher.ENCRYPT_MODE, receptorPublicKey);
byte[] simmetricKey = rsaCipher.doFinal(skeySpec.getEncoded());
//Encrypt hash with my private key
KeyStore myKeyStore = KeyStore.getInstance("JKS");
FileInputStream inStream = new FileInputStream(keyStoreFile);
myKeyStore.load(inStream, storepass.toCharArray());
PrivateKey privatekey = (PrivateKey) myKeyStore.getKey(alias, password.toCharArray());
rsaCipher.init(Cipher.ENCRYPT_MODE, privatekey);
byte[] encodedHash = rsaCipher.doFinal(digest);
//Write to outputfile
FileOutputStream outToFile = new FileOutputStream(outFile);
outToFile.write(simmetricKey);
outToFile.write(encodedHash);
outToFile.write(ciphertext);
outToFile.close();
rawDataFromFile.close();
} catch (Exception e) {
e.printStackTrace();
e.getMessage();
}
}
public static PublicKey getPublicKeyFromCert(String certLocation) {
PublicKey pub = null;
try {
InputStream inStream = new FileInputStream(certLocation);
CertificateFactory cf = CertificateFactory.getInstance("X.509");
X509Certificate cert = (X509Certificate) cf.generateCertificate(inStream);
inStream.close();
pub = (PublicKey) cert.getPublicKey();
} catch (Exception e) {
e.printStackTrace();
}
return pub;
}
}
收件人代码:
import java.io.File;
import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class Receiver {
public static void main(String[] args) {
//Sender's out file
File inFile = new File(args[0]);
//receiver's keystore
File keyStoreFile = new File(args[1]);
//receiver's keystore info
String password = args[2];
String alias = args[3];
String storepass = args[4];
//sender's cetificate
File cert = new File(args[5]);
try {
//get Sender's out file
FileInputStream rawDataFromFile = new FileInputStream(inFile);
byte[] simmetricKey = new byte[256];
byte[] hash = new byte[256];
byte[] message;
rawDataFromFile.read(simmetricKey);
rawDataFromFile.read(hash);
int b = rawDataFromFile.available();
message = new byte[b];
rawDataFromFile.read(message);
//decrypt the simmetric key with receiver's private key
KeyStore myKeyStore = KeyStore.getInstance("JKS");
FileInputStream inStream = new FileInputStream(keyStoreFile);
myKeyStore.load(inStream, storepass.toCharArray());
PrivateKey privatekey = (PrivateKey) myKeyStore.getKey(alias, password.toCharArray());
//
Cipher deCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
deCipher.init(Cipher.DECRYPT_MODE, privatekey);
byte[] key = deCipher.doFinal(simmetricKey);
System.out.println(Base64.encodeBase64String(key));
} catch (Exception e) {
System.out.println("Error del sistema " + e);
e.printStackTrace();
}
}
}
更新:
现在，我可以使用接收者的私钥解密模拟密钥.但是我不知道在加密消息时如何使用相同的参数来创建解码器.
Now I can decrypt the simmetric key using the receiver's private key. But I dont know how to create a decoder using the same argument when I encrypted the message.
发件人的用于加密纯文本的代码.
Sender's code to encrypt plain text.
String key = "Bar12345Bar12345"; // 128 bit key
String initVector = "RandomInitVector"; // 16 bytes IV
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
System.out.println(iv.getIV());
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] ciphertext = cipher.doFinal(plainText);
收件人的解密1
SecretKeySpec keySpec = new SecretKeySpec(decryptedKeySpec, "AES");
Cipher decoder = Cipher.getInstance("AES");
decoder.init(Cipher.DECRYPT_MODE, keyspec);
byte[] original = descipher.doFinal(message);
错误:给出的最终代码块未正确填充
ERROR: Given final block not properly padded
接收者的解密2
SecretKeySpec keySpec = new SecretKeySpec(decryptedKeySpec, "AES");
Cipher decoder = Cipher.getInstance("AES/CBC/PKCS5PADDING");
decoder.init(Cipher.DECRYPT_MODE, keyspec);
byte[] original = descipher.doFinal(message);
错误:参数丢失
ERROR: Parameters missing
最终更新: 现在我的代码可以工作了，感谢所有帮助. 可以从这里下载此代码(顺便说一句，它是西班牙语，但我认为这并不重要):
FINAL UPDATE: Now my code works, thanks for all the help. This code can be downloaded from here (btw, it's in spanish, but i don't think it matters):
推荐答案
问题是您正在使用AES加密
The issue is you are using AES to encrypt
SecretKeySpec skeySpec =新的SecretKeySpec(key.getBytes("UTF-8")，" AES "); 密码cipher = Cipher.getInstance(" AES /CBC/PKCS5PADDING");
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
要破译， 您正在使用RSA，
whereas to decipher, you are using RSA,
Cipher deCipher = Cipher.getInstance(" RSA /ECB/PKCS1Padding");
Cipher deCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
用于使用AES进行加密/解密的代码段
Code snippet to use for encrypt/decrypt using AES
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class EncryptionDecryptionAES {
static Cipher cipher;
public static void main(String[] args) throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey secretKey = keyGenerator.generateKey();
cipher = Cipher.getInstance("AES");
String plainText = "AES Symmetric Encryption Decryption";
System.out.println("Plain Text Before Encryption: " + plainText);
String encryptedText = encrypt(plainText, secretKey);
System.out.println("Encrypted Text After Encryption: " + encryptedText);
String decryptedText = decrypt(encryptedText, secretKey);
System.out.println("Decrypted Text After Decryption: " + decryptedText);
}
public static String encrypt(String plainText, SecretKey secretKey)
throws Exception {
byte[] plainTextByte = plainText.getBytes();
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedByte = cipher.doFinal(plainTextByte);
Base64.Encoder encoder = Base64.getEncoder();
String encryptedText = encoder.encodeToString(encryptedByte);
return encryptedText;
}
public static String decrypt(String encryptedText, SecretKey secretKey)
throws Exception {
Base64.Decoder decoder = Base64.getDecoder();
byte[] encryptedTextByte = decoder.decode(encryptedText);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decryptedByte = cipher.doFinal(encryptedTextByte);
String decryptedText = new String(decryptedByte);
return decryptedText;
}
}
请检查 http://javapapers.com/java/java-symmetric- aes-encryption-decryption-using-jce/
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