source: trunk/src/org/expeditee/encryption/io/EncryptedExpWriter.java@ 1430

Last change on this file since 1430 was 1430, checked in by bln4, 5 years ago

Fixed bug for when there are no surrogates left for a primary.
File size: 9.7 KB
Line 
1package org.expeditee.encryption.io;
2
3import java.io.IOException;
4import java.lang.reflect.InvocationTargetException;
5import java.lang.reflect.Method;
6import java.security.InvalidKeyException;
7import java.security.NoSuchAlgorithmException;
8import java.util.Arrays;
9import java.util.Base64;
10import java.util.LinkedHashMap;
11import java.util.List;
12import java.util.function.BinaryOperator;
13import java.util.function.Function;
14import java.util.stream.Collectors;
15
16import javax.crypto.BadPaddingException;
17import javax.crypto.Cipher;
18import javax.crypto.IllegalBlockSizeException;
19import javax.crypto.NoSuchPaddingException;
20import javax.crypto.SecretKey;
21import javax.crypto.spec.SecretKeySpec;
22
23import org.expeditee.encryption.CryptographyConstants;
24import org.expeditee.encryption.items.surrogates.EncryptionDetail;
25import org.expeditee.encryption.items.surrogates.EncryptionDetail.Type;
26import org.expeditee.encryption.items.surrogates.Label;
27import org.expeditee.encryption.items.surrogates.Label.LabelResult;
28import org.expeditee.gui.Frame;
29import org.expeditee.gui.Frame.BodyType;
30import org.expeditee.gui.MessageBay;
31import org.expeditee.io.Conversion;
32import org.expeditee.io.ExpWriter;
33import org.expeditee.items.Item;
34import org.expeditee.items.Line;
35import org.expeditee.items.Text;
36import org.expeditee.settings.identity.secrets.KeyList;
37import org.expeditee.stats.SessionStats;
38
39public class EncryptedExpWriter extends ExpWriter implements CryptographyConstants {
40 private SecretKey key;
41
42 private final String label;
43
44 private static final String ENCRYPTED_EXP_FLAG = "EncryptedExp";
45 private static final String nl = "\n";
46 private static final String labelProfile = "Profile";
47 private static final String labelNone = "None";
48 protected static final char TERMINATOR = 'Z';
49 protected static final String TERMINATOR_WITH_CONTINUATION = TERMINATOR + "...";
50
51 public EncryptedExpWriter(String encryptionLabel) {
52 label = encryptionLabel;
53 if (label.equals(labelNone)) {
54 return;
55 }
56
57 if (label.equals(labelProfile)) {
58 // obtain personal key
59 Text text = KeyList.PersonalKey.get();
60 List<String> data = text.getData();
61 if (data != null && !data.isEmpty()) {
62 byte[] keyBytes = Base64.getDecoder().decode(data.get(0));
63 key = new SecretKeySpec(keyBytes, SymmetricAlgorithm);
64 }
65 } else {
66 LabelResult res = Label.getLabel(label);
67 if (res == LabelResult.SuccessResolveLabelToKey) {
68 byte[] keyBytes = res.key;
69 key = new SecretKeySpec(keyBytes, SymmetricAlgorithm);
70 } else if (res == LabelResult.ErrorUnableToFindLabel) {
71 MessageBay.errorMessage(res.toString() + encryptionLabel);
72 key = null;
73 } else {
74 MessageBay.errorMessage(res.toString());
75 }
76 }
77 }
78
79 @Override
80 protected void preOutputFrame() {
81 try {
82 String line = ENCRYPTED_EXP_FLAG + label + nl;
83 _writer.write(line);
84 _stringWriter.append(line);
85 } catch (final IOException e) {
86 e.printStackTrace();
87 }
88 }
89
90 @Override
91 public void outputFrame(Frame frame) throws IOException {
92 if (_writer == null) { return; }
93
94 preOutputFrame();
95 writeHeader(frame);
96
97 // write item
98 writeItemData(frame, true);
99 writeTerminator();
100 // write lines and constraints
101 writeLineData();
102 writeTerminator();
103 writeConstraintData();
104
105 // write surrogate items
106 if (frame.hasSurrogates()) {
107 writeSurrogateTerminator();
108 writeItemData(frame, false);
109 writeTerminator();
110 } else {
111 writeTerminator();
112 }
113
114 writeLine(SessionStats.getFrameEventList(frame));
115 }
116
117 @Override
118 protected void writeLine(String line) throws IOException {
119 // do not write empty lines
120 if (line == null) { return; }
121
122 String toWrite;
123 if (key == null && label.equals(labelNone)) {
124 toWrite = line + nl;
125 } else {
126 // prepare line to write out
127 byte[] encrypted = EncryptSymmetric(line.getBytes(), key);
128 toWrite = Base64.getEncoder().encodeToString(encrypted) + nl;
129 }
130
131 // output
132 _writer.write(toWrite);
133 _stringWriter.append(toWrite);
134 }
135
136 protected void writeClass(Item toWrite) throws IOException {
137 LinkedHashMap<Character,Method> itemTags = new LinkedHashMap<Character, Method>(getItemCharTags());
138 LinkedHashMap<String,Method> itemTagsExt = new LinkedHashMap<String, Method>(getItemStrTags());
139
140 writeTag(toWrite, new Object[] {}, itemTags, 'S');
141 writeTag(toWrite, new Object[] {}, itemTagsExt, "_el");
142
143 if (toWrite.isSurrogate()) {
144 writeLine("SurrogateFor " + toWrite.getPrimary().getID());
145 }
146
147 itemTags.remove('S');
148 itemTagsExt.remove("_el");
149
150 writeTags(toWrite, new Object[] {}, itemTags);
151 writeTags(toWrite, new Object[] {}, itemTagsExt);
152 }
153
154 @Override
155 protected <T> void writeTag(Item toWrite, Object[] param, LinkedHashMap<T, Method> tags, T tag) {
156 if (toWrite.isSurrogate() && toWrite.isTagInherited(tag + "")) {
157 return;
158 }
159 EncryptionDetail encryptionDetail = toWrite.getEncryptionDetailForTag(tag + "");
160 Type encryptionDetailType = encryptionDetail.getEncryptionDetailType();
161
162 switch(encryptionDetailType) {
163 case UnencryptedOnSave:
164 writeTagUnencryptedOnSave(toWrite, param, tags, tag);
165 break;
166 case InheritanceCheckOnSave:
167 writeTagInheritanceCheckOnSave(toWrite, tags, tag);
168 break;
169 case ReencryptOnSave:
170 writeTagReencryptOnSave(toWrite, tags, tag);
171 break;
172 case UseUndecipheredValueOnSave:
173 writeTagUseUndecipheredValueOnSave(toWrite, tags, tag);
174 break;
175 }
176 }
177
178 private void writeItemData(Frame frame, boolean primaryItems) throws IOException {
179 // write each item in the frame
180 BodyType bodyType = primaryItems ? BodyType.PrimaryBody : BodyType.SurrogateBody;
181 for (Item i : frame.getItemsToSave(bodyType)) {
182 assert (!(i instanceof Line));
183 writeItem(i);
184 }
185
186 for (Item i: frame.getBodyItemsWithInsufficientPermissions()) {
187 assert (!(i instanceof Line));
188 writeItem(i);
189 }
190 }
191
192 private <T> void writeTagInheritanceCheckOnSave(Item toWrite, LinkedHashMap<T, Method> tags, T tag) {
193 List<Item> surrogateItems = toWrite.getSurrogates().stream().collect(Collectors.toList());
194 Function<Item, Boolean> isTagInherited = surrogate -> surrogate.isTagInherited(tag + "");
195 BinaryOperator<Boolean> trueExists = (a, b) -> a || b;
196 boolean surrogatesInherit = surrogateItems.stream().map(isTagInherited).collect(Collectors.reducing(trueExists)).orElseGet(() -> false);
197 boolean userHasKey = Label.getLabel(toWrite.getEncryptionLabel()) == LabelResult.SuccessResolveLabelToKey;
198
199 // If we have no surrogates that inherit this property from us, and we have the label required to encrypt it, then we should encrypt it.
200 if (!surrogatesInherit && userHasKey) {
201 EncryptionDetail reencryptOnSave = new EncryptionDetail(EncryptionDetail.Type.ReencryptOnSave);
202 toWrite.setEncryptionDetailForTag(tag + "", reencryptOnSave);
203 writeTagReencryptOnSave(toWrite, tags, tag);
204 } else {
205 // If one or more surrogates still inherit from us, or we do not have the label, then we write it out unencrypted.
206 EncryptionDetail unencryptedOnSave = new EncryptionDetail(EncryptionDetail.Type.UnencryptedOnSave);
207 toWrite.setEncryptionDetailForTag(tag + "", unencryptedOnSave);
208 writeTagUnencryptedOnSave(toWrite, new Object[] {}, tags, tag);
209 }
210 }
211
212 private <T> void writeTagReencryptOnSave(Item toWrite, LinkedHashMap<T, Method> tags, T tag) {
213 Method toRun = tags.get(tag);
214 Class<?> declarer = toRun.getDeclaringClass();
215 LabelResult res = Label.getLabel(toWrite.getEncryptionLabel());
216 if (declarer.isAssignableFrom(toWrite.getClass()) && res == LabelResult.SuccessResolveLabelToKey) {
217 try {
218 Object o = toRun.invoke(toWrite, new Object[] {});
219 o = Conversion.ConvertToExpeditee(toRun, o);
220 if (o == null) {
221 return;
222 }
223 if (o instanceof List) {
224 for (Object line: (List<?>) o) {
225 writeLineEnc(tag, line, res.key);
226 }
227 } else {
228 writeLineEnc(tag, o, res.key);
229 }
230 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
231 e.printStackTrace();
232 } catch (IOException e) {
233 e.printStackTrace();
234 }
235 }
236 }
237
238 private <T> void writeTagUseUndecipheredValueOnSave(Item toWrite, LinkedHashMap<T, Method> tags, T tag) {
239 EncryptionDetail encryptionDetail = toWrite.getEncryptionDetailForTag(tag + "");
240 try {
241 writeLine(tag + "E", encryptionDetail.getUndecipheredValue());
242 } catch (IOException e) {
243 e.printStackTrace();
244 }
245 }
246
247 private <T> void writeTagUnencryptedOnSave(Item toWrite, Object[] param, LinkedHashMap<T, Method> tags, T tag) {
248 super.writeTag(toWrite, param, tags, tag);
249 }
250
251 private void writeSurrogateTerminator() throws IOException {
252 writeLine(TERMINATOR_WITH_CONTINUATION + nl);
253 }
254
255 private <T> void writeLineEnc(T tag, Object line, byte[] keyBytes) throws IOException {
256 SecretKey key = new SecretKeySpec(keyBytes, SymmetricAlgorithm);
257 byte[] lineEncryptedBytes = EncryptSymmetric(line.toString().getBytes(), key);
258 line = Base64.getEncoder().encodeToString(lineEncryptedBytes);
259 writeLine(tag + "E", line.toString());
260 }
261
262 private static byte[] EncryptSymmetric(byte[] toEncrypt, SecretKey key) {
263 try {
264 Cipher cipher = Cipher.getInstance(SymmetricAlgorithm + SymmetricAlgorithmParameters);
265 cipher.init(Cipher.ENCRYPT_MODE, key);
266 //could use modulus
267 int length = (int) ((Math.ceil(toEncrypt.length / 16f)) * 16);
268 byte[] toEncryptSizeAdjusted = Arrays.copyOf(toEncrypt, length);
269 byte[] result = cipher.doFinal(toEncryptSizeAdjusted);
270 return result;
271 } catch (final NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
272 | IllegalBlockSizeException | BadPaddingException e) {
273 e.printStackTrace();
274 return null;
275 }
276 }
277}
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