import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.security.Key;
import java.security.KeyPair;
import javax.crypto.Cipher;
public class Test {
public static void main(String[] args) throws Exception {
/* 1
SecureRandom sr = new SecureRandom();
KeyPairGenerator kg = KeyPairGenerator.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());
//注意密钥大小最好为1024,否则解密会有乱码情况.
kg.initialize(1024, sr);
FileOutputStream fos = new FileOutputStream("C:/RSAKey.xml");
ObjectOutputStream oos = new ObjectOutputStream(fos);
//生成密钥
oos.writeObject(kg.generateKeyPair().getPrivate());
oos.close();
*/
/* 2
Key kp;
String fileName = "RSAKey.xml";
InputStream is = Test.class.getClassLoader().getResourceAsStream(fileName);
ObjectInputStream oos = new ObjectInputStream(is);
kp = (Key) oos.readObject();
oos.close();
encryptFile("C:/bsmain_runtime.log","C:/encry.log",kp);
*/
}
public static void encryptFile(String srcFileName, String destFileName,Key publicKkey) throws Exception {
OutputStream outputWriter = null;
InputStream inputReader = null;
try {
Cipher cipher = Cipher.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] buf = new byte[100];
int bufl;
cipher.init(Cipher.ENCRYPT_MODE, publicKkey);
System.out.println(cipher.getBlockSize()+"================");
outputWriter = new FileOutputStream(destFileName);
inputReader = new FileInputStream(srcFileName);
while ((bufl = inputReader.read(buf)) != -1) {
byte[] encText = null;
byte[] newArr = null;
if (buf.length == bufl) {
newArr = buf;
} else {
newArr = new byte[bufl];
for (int i = 0; i < bufl; i++) {
newArr[i] = (byte) buf[i];
}
}
encText = cipher.doFinal(newArr);
outputWriter.write(encText);
}
outputWriter.flush();
} catch (Exception e) {
throw e;
} finally {
try {
if (outputWriter != null) {
outputWriter.close();
}
if (inputReader != null) {
inputReader.close();
}
} catch (Exception e) {
}
}
}
}