Java Code Examples for org.spongycastle.util.encoders.Hex#encode()

@Test
public void testAddressStringToBytes() {
	// valid address
	String HexStr = "6c386a4b26f73c802f34673f7248bb118f97424a";
	byte[] expected = Hex.decode(HexStr);
	byte[] result = Utils.addressStringToBytes(HexStr);
	assertEquals(Arrays.areEqual(expected, result), true);
	
	// invalid address, we removed the last char so it cannot decode
	HexStr = "6c386a4b26f73c802f34673f7248bb118f97424";
	expected = null;
	result = Utils.addressStringToBytes(HexStr);
	assertEquals(expected, result);
	
	// invalid address, longer than 20 bytes
	HexStr = new String(Hex.encode("I am longer than 20 bytes, i promise".getBytes()));
	expected = null;
	result = Utils.addressStringToBytes(HexStr);
	assertEquals(expected, result);
	
	// invalid address, shorter than 20 bytes
	HexStr = new String(Hex.encode("I am short".getBytes()));
	expected = null;
	result = Utils.addressStringToBytes(HexStr);
	assertEquals(expected, result);
}
 

public static String hash (InputStream is, String hashFunction) throws IOException, NoSuchAlgorithmException
{
	MessageDigest digester;
	
	digester = MessageDigest.getInstance(hashFunction); //MD5 or SHA-1
	int BYTE_READ_SIZE = 1024*64; // 64k chunks
	
	  byte[] bytes = new byte[BYTE_READ_SIZE];
	  int byteCount;
	  while ((byteCount = is.read(bytes)) > 0) {
	    digester.update(bytes, 0, byteCount);
	  }
	  
	  byte[] messageDigest = digester.digest();
	  
      return new String(Hex.encode(messageDigest), Charset.forName("UTF-8"));

}
 

public AttachmentServer(Context context, MasterSecret masterSecret, Attachment attachment)
        throws IOException {
    try {
        this.context = context;
        this.masterSecret = masterSecret;
        this.attachment = attachment;
        this.socket = new ServerSocket(0, 0, InetAddress.getByAddress(new byte[]{127, 0, 0, 1}));
        this.port = socket.getLocalPort();
        this.auth = new String(Hex.encode(EncryptUtils.getSecretBytes(16)));

        this.socket.setSoTimeout(5000);
    } catch (UnknownHostException e) {
        throw new AssertionError(e);
    }
}
 

/**
 * Gets encrypt string.
 *加密
 * @param content  the content
 * @param password the password
 * @return the encrypt string
 * @throws NoSuchAlgorithmException the no such algorithm exception
 * @throws InvalidKeySpecException  the invalid key spec exception
 */
public static String getEncryptString(String content, String password)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    String salt = getRandomString(32);//盐
    char[] chars = password.toCharArray();//加密密码明文

    byte[] encryPassword = pbkdf2(chars, salt.getBytes(), 1000, 32);
    // 加密
    byte[] enc = encrypt(content.getBytes(), encryPassword);
    return salt + new String(Hex.encode(enc));
}
 

public String getPublicKey(){
    return new String(Hex.encode(getKey()));
}
 

public String getPrivateKey(){
    return new String(Hex.encode(getKey()));
}
 

public String getPublicKeyFingerprint ()
{
    PGPPublicKey key = pkr.getPublicKey();
    String fullKey = new String(Hex.encode(key.getFingerprint()));
    return fullKey.substring(fullKey.length()-16);
}
 

public static String getFingerprintFromKey(byte[] keyblock) throws IOException, PGPException {
	PGPPublicKey key = extractPublicKeyFromBytes(keyblock);
	return new String(Hex.encode(key.getFingerprint()));
}
 

public static String getJpegHash(InputStream is) throws NoSuchAlgorithmException, IOException {
	
	
	JPEGDecoder decoder = new JPEGDecoder(is);
    decoder.decodeHeader();
    int width = decoder.getImageWidth();
    //int height = decoder.getImageHeight();
    decoder.startDecode();
    
    int stride = width*4; //4 bytes per pixel RGBA

    MessageDigest digester = MessageDigest.getInstance("SHA-1");
	
//    System.out.println("Stride: " + stride);
    
	for(int h=0; h<decoder.getNumMCURows(); h++) {
		
	    ByteBuffer bb = ByteBuffer.allocate(stride * decoder.getMCURowHeight());

	//	System.out.println("handling row: " + h);
		
	    decoder.decodeRGB(bb, stride, 1);
		
		digester.update(bb.array());
		
	}
	
	byte[] messageDigest = digester.digest();
	return new String(Hex.encode(messageDigest), Charset.forName("UTF-8"));
}
 

public static String getJpegHash(byte[] jpegBytes) throws NoSuchAlgorithmException, IOException {
	
	JPEGDecoder decoder = new JPEGDecoder(new ByteArrayInputStream(jpegBytes));
    decoder.decodeHeader();
    int width = decoder.getImageWidth();
    //int height = decoder.getImageHeight();
    decoder.startDecode();
    
    int stride = width*4; //4 bytes per pixel RGBA

    MessageDigest digester = MessageDigest.getInstance("SHA-1");
	
//    System.out.println("Stride: " + stride);
    
	for(int h=0; h<decoder.getNumMCURows(); h++) {
		
	    ByteBuffer bb = ByteBuffer.allocate(stride * decoder.getMCURowHeight());

	//	System.out.println("handling row: " + h);
		
	    decoder.decodeRGB(bb, stride, 1);
		
		digester.update(bb.array());
		
	}
	
	byte[] messageDigest = digester.digest();
	return new String(Hex.encode(messageDigest), Charset.forName("UTF-8"));
}
 

public static String getBitmapHash(Bitmap bitmap) throws NoSuchAlgorithmException, IOException {
	MessageDigest digester = MessageDigest.getInstance("SHA-1");
	
	for(int h=0; h<bitmap.getHeight(); h++) {
		int[] row = new int[bitmap.getWidth()];
		bitmap.getPixels(row, 0, row.length, 0, h, row.length, 1);
		

		//System.out.println("row " + h + "=" + row[0]);
		
		byte[] rowBytes = new byte[row.length];
		for(int b=0; b<row.length; b++) {
			
			int p = row[b];
			rowBytes[b] = (byte) p;
			

			int R = (p >> 16) & 0xff;
			int G = (p >> 8) & 0xff;
			int B = p & 0xff;
			
			if (b == 0)
			System.out.println("row " + h + ": " + R +"," + G + "," + B);
		}
		
		digester.update(rowBytes);

		//byte[] messageDigest = digester.digest();
		//String lineHash = new String(Hex.encode(messageDigest), Charset.forName("UTF-8"));
		//System.out.println("line " + h + "=" + lineHash);
		
		rowBytes = null;
		row = null;
		
	}
	
	byte[] messageDigest = digester.digest();
	return new String(Hex.encode(messageDigest), Charset.forName("UTF-8"));
}