Java AESWrapEngine类代码示例

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public static byte[] wrap(byte[] key, byte[] data) {
  AESWrapEngine engine = new AESWrapEngine();
  KeyParameter params = new KeyParameter(key);
  engine.init(true, params);
  PKCS7Padding padding = new PKCS7Padding();
  byte[] unpadded = data;

  //
  // Add padding
  //

  byte[] padded = new byte[unpadded.length + (8 - unpadded.length % 8)];
  System.arraycopy(unpadded, 0, padded, 0, unpadded.length);
  padding.addPadding(padded, unpadded.length);

  //
  // Wrap
  //

  byte[] encrypted = engine.wrap(padded, 0, padded.length);

  return encrypted;
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public static byte[] unwrap(byte[] key, byte[] data) {
  //
  // Decrypt the encrypted data
  //
  
  AESWrapEngine engine = new AESWrapEngine();
  CipherParameters params = new KeyParameter(key);
  engine.init(false, params);
  
  try {
    byte[] decrypted = engine.unwrap(data, 0, data.length);
    //
    // Unpad the decrypted data
    //

    PKCS7Padding padding = new PKCS7Padding();
    int padcount = padding.padCount(decrypted);
    
    //
    // Remove padding
    //
    
    decrypted = Arrays.copyOfRange(decrypted, 0, decrypted.length - padcount);
    
    return decrypted;
  } catch (InvalidCipherTextException icte) {
    return null;
  }
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
private byte[] AES_KeyWrap_Encrypt(AlgorithmID alg, byte[] rgbKey) throws CoseException
{
    if (rgbKey.length != alg.getKeySize() / 8) throw new CoseException("Key is not the correct size");

    AESWrapEngine foo = new AESWrapEngine();
    KeyParameter parameters = new KeyParameter(rgbKey);
    foo.init(true, parameters);
    return foo.wrap(rgbContent, 0, rgbContent.length);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
private byte[] AES_KeyWrap_Decrypt(AlgorithmID alg, byte[] rgbKey) throws CoseException, InvalidCipherTextException
{
    if (rgbKey.length != alg.getKeySize() / 8) throw new CoseException("Key is not the correct size");

    AESWrapEngine foo = new AESWrapEngine();
    KeyParameter parameters = new KeyParameter(rgbKey);
    foo.init(false, parameters);
    return foo.unwrap(rgbEncrypted, 0, rgbEncrypted.length);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public static byte[] KeyWrap(Transformation transformation, byte[] symmetricKey, byte[] cek) {
	AESWrapEngine engine = new AESWrapEngine();
	CipherParameters param = new KeyParameter(
			new SecretKeySpec(symmetricKey, transformation.getAlgorithm()).getEncoded());
	engine.init(true, param);
	return engine.wrap(cek, 0, cek.length);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public static byte[] keyUnwrap(Transformation transformation, byte[] symmetricKey, byte[] cek) throws Exception {
	AESWrapEngine engine = new AESWrapEngine();
	CipherParameters param = new KeyParameter(
			new SecretKeySpec(symmetricKey, transformation.getAlgorithm()).getEncoded());
	engine.init(false, param);
	return engine.unwrap(cek, 0, cek.length);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public BcAESSymmetricKeyWrapper(KeyParameter wrappingKey)
{
    super(AESUtil.determineKeyEncAlg(wrappingKey), new AESWrapEngine(), wrappingKey);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public BcAESSymmetricKeyUnwrapper(KeyParameter wrappingKey)
{
    super(AESUtil.determineKeyEncAlg(wrappingKey), new AESWrapEngine(), wrappingKey);
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
public Wrap()
{
    super(new AESWrapEngine());
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
/**
 * Return the bytes currently in this encoder.
 * If 'wrappingKey' is non null, encrypt the bytes prior to returning them.
 * 
 * @return The (possibly encrypted bytes) or null if an exception is raised
 *         while encrypting.
 * 
 */
public byte[] getBytes() {
  if (null == this.wrappingKey) {
    return this.stream.toByteArray();
  } else {
    AESWrapEngine engine = new AESWrapEngine();
    KeyParameter params = new KeyParameter(this.wrappingKey);
    engine.init(true, params);
    PKCS7Padding padding = new PKCS7Padding();
    byte[] unpadded = this.stream.toByteArray();

    //
    // Add padding
    //

    byte[] padded = new byte[unpadded.length + (8 - unpadded.length % 8)];
    System.arraycopy(unpadded, 0, padded, 0, unpadded.length);
    padding.addPadding(padded, unpadded.length);

    //
    // Wrap
    //

    byte[] encrypted = engine.wrap(padded, 0, padded.length);

    //
    // Add 0x0 flag and encrypted data size
    //

    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    try {
      baos.write(GTSEncoder.FLAGS_ENCRYPTED);
      baos.write(Varint.encodeUnsignedLong(encrypted.length));
      baos.write(encrypted);
      return baos.toByteArray();
    } catch (IOException ioe) {
      return null;
    }
  }
}
 

import org.bouncycastle.crypto.engines.AESWrapEngine; //导入依赖的package包/类
@Test
public void testAddValue_encrypted() throws Exception {
  long now = System.currentTimeMillis() * 1000L;

  byte[] key = new byte[32];
  
  GTSEncoder encoder = new GTSEncoder(now - 1000000L, key);
  
  encoder.addValue(now, GeoTimeSerie.NO_LOCATION, GeoTimeSerie.NO_ELEVATION, 1L);
  encoder.addValue(now + 1000000L, GeoTimeSerie.NO_LOCATION, GeoTimeSerie.NO_ELEVATION, 2L);
  
  byte[] encrypted = encoder.getBytes();
  Assert.assertEquals(GTSEncoder.FLAGS_ENCRYPTED, encrypted[0] & GTSEncoder.FLAGS_MASK_ENCRYPTED);
  Assert.assertEquals(26, encrypted.length);

  //
  // Now check that we can decrypt the payload
  // We can't use n offset different than 0 in unwrap due to BJA-461
  // so we have to copy the data prior to decrypting it.
  //
      
  AESWrapEngine engine = new AESWrapEngine();
  KeyParameter params = new KeyParameter(key);
  engine.init(false, params);
  byte[] enc = new byte[24];
  System.arraycopy(encrypted, 2, enc, 0, 24);
  byte[] decrypted = engine.unwrap(enc, 0, 24);    
  
  //
  // Now decode the decrypted data
  //
  
  PKCS7Padding padding = new PKCS7Padding();    
  GTSDecoder decoder = new GTSDecoder(now - 1000000L, ByteBuffer.wrap(decrypted, 0, decrypted.length - padding.padCount(decrypted)));
  
  decoder.next();
  Assert.assertEquals(now, decoder.getTimestamp());
  Assert.assertEquals(GeoTimeSerie.NO_LOCATION, decoder.getLocation());
  Assert.assertEquals(GeoTimeSerie.NO_ELEVATION, decoder.getElevation());
  Assert.assertEquals(1L, decoder.getValue());

  decoder.next();
  Assert.assertEquals(now + 1000000L, decoder.getTimestamp());
  Assert.assertEquals(GeoTimeSerie.NO_LOCATION, decoder.getLocation());
  Assert.assertEquals(GeoTimeSerie.NO_ELEVATION, decoder.getElevation());
  Assert.assertEquals(2L, decoder.getValue());
}