timliao0308

RSA加解密通常雙方皆需有PublicKey及PrivateKey

將加密資料用PrivateKey加密後丟出，PublicKey解密以驗簽證(PublicKey事前即需拋給對方)

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public class RSAUtils {
	private static PublicKey pubKey = null;
	private static PrivateKey priKey = null;

	public static void loadRSAPubKey(String filename) throws IOException {
		pubKey = (PublicKey) RSAKey.readPublicKeyFile(filename);
	}

	public static void loadRSAPriKey(String filename) {
		priKey = (PrivateKey) RSAKey.readPrivateKeyFile(filename);
	}

	public static PublicKey getPublicKey() {
		return pubKey;
	}

	public static PrivateKey getPrivateKey() {
		return priKey;
	}
	
	public static String pubEncrypt(byte[] sessKey) {
		try {
			Cipher desCipher = Cipher.getInstance("RSA/ECB/OAEPWITHSHA-256ANDMGF1PADDING");
			desCipher.init(Cipher.ENCRYPT_MODE, getPublicKey());
			return RSAKey.bytesToBase64Str(desCipher.doFinal(sessKey));
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
	public static String priEncrypt(byte[] hash) {
		try {
			Cipher desCipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
			desCipher.init(Cipher.ENCRYPT_MODE, getPrivateKey());
			return RSAKey.bytesToBase64Str(desCipher.doFinal(hash));
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
	
	
	
	public static byte[] priDecrypt(String encryptStr) {
		try {
			Cipher desCipher = Cipher.getInstance("RSA/ECB/OAEPWITHSHA-256ANDMGF1PADDING");
			desCipher.init(Cipher.DECRYPT_MODE, getPrivateKey());
			return desCipher.doFinal(RSAKey.base64StrToBytes(encryptStr));
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	public static byte[] pubDecrypt(String encryptStr) {
		try {
			Cipher desCipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
			desCipher.init(Cipher.DECRYPT_MODE, getPublicKey());
			return desCipher.doFinal(RSAKey.base64StrToBytes(encryptStr));
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	
	public static void main(String[] arg) {
		
	}
	
}

其中需有KEY之產生，在這以J2EE之架構

import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.security.KeyFactory;
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.security.spec.X509EncodedKeySpec;

import sun.misc.BASE64Decoder;
 import sun.misc.BASE64Encoder;

public class RSAKey {
  public static PublicKey readPublicKeyFile(String filename) throws IOException {
   try {
    String sysRootKey = "VPlatform.install.root";
    String root = System.getProperty(sysRootKey);
    File f = new File(root + "\\WEB-INF\\" + filename);
    byte[] b = read(f);
    PublicKey key = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(b));
    
    return key;
   } catch (Exception e){
    e.printStackTrace();
   }
   return null;
  }

 public static PrivateKey readPrivateKeyFile(String filename) {
   try {
    String sysRootKey = "VPlatform.install.root";
    String root = System.getProperty(sysRootKey);
    File f = new File(root + "\\WEB-INF\\" + filename);
    byte[] b = read(f);
    PrivateKey key = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(b));
    
    return key;
   } catch (Exception e){
    e.printStackTrace();
   }
   return null;
  }

 public static String bytesToBase64Str(byte[] bytes) {
   return new BASE64Encoder().encode(bytes);
  }

 public static byte[] base64StrToBytes(String base64Str) {
   try {
    return new BASE64Decoder().decodeBuffer(base64Str);
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   return null;
  }
  
  public static byte[] read(File file) throws IOException {

     ByteArrayOutputStream ous = null;
      InputStream ios = null;
      try {
          byte[] buffer = new byte[4096];
          ous = new ByteArrayOutputStream();
          ios = new FileInputStream(file);
          int read = 0;
          while ( (read = ios.read(buffer)) != -1 ) {
              ous.write(buffer, 0, read);
          }
      } finally {
          try {
               if ( ous != null )
                   ous.close();
          } catch ( IOException e) {
          }

         try {
               if ( ios != null )
                    ios.close();
          } catch ( IOException e) {
          }
      }
      return ous.toByteArray();
  }
 }