我試圖生成一個AES密鑰,使用RSA對其進行加密和解密。 它種類的作品,除了在解密數據和使用Base64編碼之後,我在我的實際字符串(base64編碼的AES密鑰)之前得到一堆「A」字母。我猜這些是字節中的零。使用RSA解密字符串在開始時返回附加的零
「RSA/ECB/NoPadding」參數是強制性的。我究竟做錯了什麼 ?我需要它返回原始字符串/字節。
package szyfrator;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.apache.tools.bzip2.CBZip2OutputStream;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.common.io.Files;
import com.sun.org.apache.xml.internal.security.utils.Base64;
public class Cryptography {
private static byte[] aesKey;
private static String base64AESKey;
private static byte[] encryptedAESKey;
private static String base64AESEncryptedKey;
private static byte[] aesKeyTransformed;
public static void main(String args[]){
Cryptography.generateAESkey();
Cryptography.encryptAESKey(new File("G:\\HASHBABYHASH\\public.txt"));
Cryptography.decryptAESKey(new File("G:\\HASHBABYHASH\\private.txt"));
System.out.println("String: " + Base64.encode(Cryptography.getAesKey()) + "\r\n");
System.out.println("Encrypted string: " + Cryptography.getBase64EncryptedKey() + "\r\n");
System.out.println("Decrypted String: " + Base64.encode(Cryptography.getAesKeyTransformed()) + "\r\n");
}
public static void generateAESkey(){
try {
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
keyGen.init(256);
SecretKey secretKey = keyGen.generateKey();
byte[] keyBytes = secretKey.getEncoded();
base64AESKey = Base64.encode(keyBytes);
aesKey = keyBytes;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
public static void encryptAESKey(File publicKeyFile){
try {
FileInputStream input = new FileInputStream(publicKeyFile);
byte[] decoded = Base64.decode(IOUtils.toByteArray(input));
X509EncodedKeySpec publicSpec = new X509EncodedKeySpec(decoded);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(publicSpec);
Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedAESKey = cipher.doFinal(aesKey);
base64AESEncryptedKey = Base64.encode(encryptedAESKey);
input.close();
}catch (Exception e) {
e.printStackTrace();
}
}
public static void decryptAESKey(File privateKeyFile){
try {
FileInputStream input = new FileInputStream(privateKeyFile);
byte[] decoded = Base64.decode(IOUtils.toByteArray(input));
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decoded);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
aesKeyTransformed = cipher.doFinal(encryptedAESKey);
input.close();
}catch (Exception e) {
e.printStackTrace();
}
}
}
下面是結果:
String: xVwH7Nbz84emVoH0J31sRHC+B669T9wCUVlTDhYgXiI=
Encrypted string: INTA8rx46hX6bZbDIl4iiWsUGO4ywCW0Aee1reqQ3wR5X7He5ztLHvyZoa0WZmUGYbYwprNGffRI
OVJFxczMHkxUfHU1WWCTzcfNylD+sWObIYrbyc13aZi9OL/r1GXuaGtkIgTJyqv0QPHfIri7iaH3
Lr/F4EIcyphJM3E2reQ=
Decrypted String: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAxVwH7Nbz84emVoH0J31sRHC+
B669T9wCUVlTDhYgXiI=
「PKCS8EncodedKeySpec」是解密所需的keyspec?應該是X509吧? – venture