[1259] | 1 | package org.expeditee.auth.sharing;
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| 2 |
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[1260] | 3 | import java.security.InvalidKeyException;
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| 4 | import java.security.NoSuchAlgorithmException;
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[1259] | 5 | import java.security.SecureRandom;
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[1260] | 6 | import java.util.Arrays;
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[1259] | 7 | import java.util.Base64;
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[1260] | 8 | import java.util.Collection;
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[1259] | 9 | import java.util.HashMap;
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| 10 | import java.util.List;
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| 11 | import java.util.Map;
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| 12 | import java.util.Random;
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| 13 |
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[1260] | 14 | import javax.crypto.BadPaddingException;
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| 15 | import javax.crypto.Cipher;
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| 16 | import javax.crypto.IllegalBlockSizeException;
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| 17 | import javax.crypto.NoSuchPaddingException;
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| 18 | import javax.crypto.SecretKey;
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| 19 | import javax.crypto.spec.SecretKeySpec;
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| 20 |
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[1259] | 21 | import org.expeditee.gui.DisplayController;
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[1260] | 22 | import org.expeditee.gui.Frame;
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| 23 | import org.expeditee.gui.FrameIO;
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[1259] | 24 | import org.expeditee.items.Text;
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[1260] | 25 | import org.ngikm.cryptography.CryptographyConstants;
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[1259] | 26 |
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| 27 | import com.codahale.shamir.Scheme;
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| 28 |
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[1260] | 29 | public class Actions implements CryptographyConstants {
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[1259] | 30 |
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| 31 | public static Text GenerateSecret(String label) {
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| 32 | return AuthGenerateSecret(label);
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| 33 | }
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| 34 |
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| 35 | public static Text SplitSecret(Text key) {
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| 36 | return AuthSplitSecret(key);
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| 37 | }
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[1260] | 38 |
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| 39 | public static Text JoinSecret(Text key) {
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| 40 | return AuthJoinSecret(key);
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| 41 | }
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[1261] | 42 |
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| 43 | public static void Encrypt(Text labelWithKey) {
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| 44 | AuthEncrypt(labelWithKey);
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| 45 | }
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| 46 |
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| 47 | public static void Decrypt(Text labelWithKey) {
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| 48 | AuthDecrypt(labelWithKey);
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| 49 | }
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| 50 |
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[1259] | 51 | public static Text AuthGenerateSecret(String label) {
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| 52 | // Generate AES Key
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| 53 | Random rand = new SecureRandom();
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| 54 | byte[] keyBytes = new byte[16];
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| 55 | rand.nextBytes(keyBytes);
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| 56 | String key = Base64.getEncoder().encodeToString(keyBytes);
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| 57 |
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| 58 | Text text = new Text(label);
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| 59 | text.setData(key);
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| 60 | text.setPosition(DisplayController.getMousePosition());
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| 61 | return text;
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| 62 | }
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| 63 |
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| 64 | public static Text AuthSplitSecret(Text key) {
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| 65 | // Retrieve secret
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| 66 | String secret = key.getData().get(0);
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| 67 | byte[] secretBytes = Base64.getDecoder().decode(secret);
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| 68 |
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| 69 | // Obtain parameters for shamir
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| 70 | String[] arguments = key.getText().split(" ");
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[1310] | 71 | int requiredShares = Integer.parseInt(arguments[1]);
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| 72 | int totalShares = arguments.length - 2;
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[1259] | 73 |
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| 74 | // Create shares
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| 75 | Scheme scheme = new Scheme(new SecureRandom(), totalShares, requiredShares);
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| 76 | Map<Integer, byte[]> split = scheme.split(secretBytes);
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| 77 |
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| 78 | // Add shares to key
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| 79 | List<String> data = key.getData();
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| 80 | for (Integer i: split.keySet()) {
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| 81 | data.add("{" + i + "}" + Base64.getEncoder().encodeToString(split.get(i)));
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| 82 | }
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| 83 | key.setData(data);
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| 84 |
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| 85 | return key;
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| 86 | }
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| 87 |
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| 88 | public static Text AuthJoinSecret(Text key) {
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| 89 | Map<Integer, byte[]> contributingParts = new HashMap<Integer, byte[]>();
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| 90 |
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| 91 | // Retrieve splits
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| 92 | List<String> data = key.getData();
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| 93 | for (String d: data) {
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| 94 | if (d.startsWith("{")) {
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| 95 | String[] split = d.split("}");
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| 96 | Integer k = Integer.parseInt(split[0].replace("{", ""));
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| 97 | byte[] v = Base64.getDecoder().decode(split[1]);
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| 98 | contributingParts.put(k, v);
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | // Obtain parameters for shamir
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| 103 | String[] arguments = key.getText().split(" ");
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[1310] | 104 | int totalShares = Integer.parseInt(arguments[2]);
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| 105 | int requiredShares = Integer.parseInt(arguments[1]);
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[1259] | 106 |
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| 107 | // Perform join
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| 108 | Scheme scheme = new Scheme(new SecureRandom(), totalShares, requiredShares);
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| 109 | byte[] join = scheme.join(contributingParts);
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| 110 |
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| 111 | data.clear();
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| 112 | data.add(Base64.getEncoder().encodeToString(join));
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| 113 |
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| 114 | return key;
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| 115 | }
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[1260] | 116 |
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| 117 | public static void AuthEncrypt(Text labelWithKey) {
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| 118 | // Obtain encryption key
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| 119 | String keyEncoded = labelWithKey.getData().get(0);
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| 120 | byte[] keyDecoded = Base64.getDecoder().decode(keyEncoded);
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| 121 | SecretKey key = new SecretKeySpec(keyDecoded, SymmetricAlgorithm);
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| 122 |
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| 123 | // Perform encryption
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| 124 | Frame toEncrypt = FrameIO.LoadFrame(labelWithKey.getLink());
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| 125 | Collection<Text> textItems = toEncrypt.getTextItems();
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| 126 | for (Text t: textItems) {
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| 127 | byte[] encrypted = EncryptSymmetric(t.getText().getBytes(), key);
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| 128 | t.setText(Base64.getEncoder().encodeToString(encrypted));
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| 129 | }
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| 130 |
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| 131 | // Save changes
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| 132 | FrameIO.SaveFrame(toEncrypt);
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| 133 | }
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| 134 |
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| 135 | public static void AuthDecrypt(Text labelWithKey) {
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| 136 | // Obtain encryption key
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| 137 | String keyEncoded = labelWithKey.getData().get(0);
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| 138 | byte[] keyDecoded = Base64.getDecoder().decode(keyEncoded);
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| 139 | SecretKey key = new SecretKeySpec(keyDecoded, SymmetricAlgorithm);
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| 140 |
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| 141 | // Perform decryption
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[1261] | 142 | Frame toDecrypt = FrameIO.LoadFrame(labelWithKey.getLink());
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| 143 | Collection<Text> textItems = toDecrypt.getTextItems();
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[1260] | 144 | for (Text t: textItems) {
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| 145 | byte[] decrypted = DecryptSymmetric(Base64.getDecoder().decode(t.getText().getBytes()), key);
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| 146 | t.setText(new String(decrypted));
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| 147 | }
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[1261] | 148 |
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| 149 | // Save changes
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| 150 | FrameIO.SaveFrame(toDecrypt);
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[1260] | 151 | }
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| 152 |
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| 153 | private static byte[] EncryptSymmetric(final byte[] toEncrypt, final SecretKey key) {
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| 154 | // toEncrypt = Base64.getDecoder().decode(toEncrypt);
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| 155 | try {
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| 156 | final Cipher cipher = Cipher.getInstance(SymmetricAlgorithm + SymmetricAlgorithmParameters);
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| 157 | cipher.init(Cipher.ENCRYPT_MODE, key);
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| 158 | //could use modulus
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| 159 | final int length = (int) ((Math.ceil(toEncrypt.length / 16f)) * 16);
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| 160 | final byte[] toEncryptSizeAdjusted = Arrays.copyOf(toEncrypt, length);
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| 161 | //System.err.println("(" + toEncryptSizeAdjusted.length + ")" + "Before Encryption Data: "
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| 162 | // + Arrays.toString(toEncryptSizeAdjusted));
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| 163 | final byte[] result = cipher.doFinal(toEncryptSizeAdjusted);
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| 164 | //System.err.println("(" + result.length + ")" + "Encrypted Data: " + Arrays.toString(result));
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| 165 | return result;
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| 166 | } catch (final NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
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| 167 | | IllegalBlockSizeException | BadPaddingException e) {
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| 168 | e.printStackTrace();
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| 169 | return null;
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| 170 | }
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| 171 | }
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| 172 |
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| 173 | private static byte[] DecryptSymmetric(final byte[] toDecrypt, final SecretKey key) {
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| 174 | try {
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| 175 | final Cipher cipher = Cipher.getInstance(SymmetricAlgorithm + SymmetricAlgorithmParameters);
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| 176 | cipher.init(Cipher.DECRYPT_MODE, key);
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| 177 | final byte[] decryptedBytes = cipher.doFinal(toDecrypt);
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| 178 | int indexOfZero = decryptedBytes.length - 1;
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| 179 | for (int i = decryptedBytes.length - 1; i >= 0; i--) {
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| 180 | if (decryptedBytes[i] != (byte) 0) {
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| 181 | indexOfZero = i + 1;
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| 182 | break;
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| 183 | }
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| 184 | }
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| 185 | return Arrays.copyOf(decryptedBytes, indexOfZero);
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| 186 | } catch (final NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
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| 187 | | IllegalBlockSizeException | BadPaddingException e) {
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| 188 | e.printStackTrace();
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| 189 | return null;
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| 190 | }
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| 191 | }
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[1259] | 192 | }
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