From d172058150601c8ae6a3816c936e18685063389f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= <dominik@dominikschuermann.de>
Date: Sun, 7 Sep 2014 17:58:28 +0200
Subject: Due to compatiblity switch from SHA512 to SHA256

---
 .../keychain/helper/Preferences.java               | 87 +++++++++++++---------
 1 file changed, 53 insertions(+), 34 deletions(-)

(limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper')

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper/Preferences.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper/Preferences.java
index af7bdbdd2..6e16c8c54 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper/Preferences.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper/Preferences.java
@@ -29,7 +29,6 @@ import org.sufficientlysecure.keychain.Constants.Pref;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Iterator;
 import java.util.ListIterator;
 import java.util.Vector;
 
@@ -94,7 +93,7 @@ public class Preferences {
 
     public int getDefaultHashAlgorithm() {
         return mSharedPreferences.getInt(Constants.Pref.DEFAULT_HASH_ALGORITHM,
-                HashAlgorithmTags.SHA512);
+                HashAlgorithmTags.SHA256);
     }
 
     public void setDefaultHashAlgorithm(int value) {
@@ -237,43 +236,63 @@ public class Preferences {
     }
 
     public void updatePreferences() {
-        // migrate keyserver to hkps
-        if (mSharedPreferences.getInt(Constants.Pref.KEY_SERVERS_DEFAULT_VERSION, 0) !=
-                Constants.Defaults.KEY_SERVERS_VERSION) {
-            String[] serversArray = getKeyServers();
-            ArrayList<String> servers = new ArrayList<String>(Arrays.asList(serversArray));
-            ListIterator<String> it = servers.listIterator();
-            while (it.hasNext()) {
-                String server = it.next();
-                if (server == null) {
-                    continue;
+        if (mSharedPreferences.getInt(Constants.Pref.PREF_DEFAULT_VERSION, 0) !=
+                Constants.Defaults.PREF_VERSION) {
+            switch (mSharedPreferences.getInt(Constants.Pref.PREF_DEFAULT_VERSION, 0)) {
+                case 1:
+                    // fall through
+                case 2:
+                    // fall through
+                case 3: {
+                    // migrate keyserver to hkps
+                    String[] serversArray = getKeyServers();
+                    ArrayList<String> servers = new ArrayList<String>(Arrays.asList(serversArray));
+                    ListIterator<String> it = servers.listIterator();
+                    while (it.hasNext()) {
+                        String server = it.next();
+                        if (server == null) {
+                            continue;
+                        }
+                        if (server.equals("pool.sks-keyservers.net")) {
+                            // use HKPS!
+                            it.set("hkps://hkps.pool.sks-keyservers.net");
+                        } else if (server.equals("pgp.mit.edu")) {
+                            // use HKPS!
+                            it.set("hkps://pgp.mit.edu");
+                        } else if (server.equals("subkeys.pgp.net")) {
+                            // remove, because often down and no HKPS!
+                            it.remove();
+                        }
+
+                    }
+                    setKeyServers(servers.toArray(new String[servers.size()]));
+
+                    // migrate old uncompressed constant to new one
+                    if (mSharedPreferences.getInt(Constants.Pref.DEFAULT_FILE_COMPRESSION, 0)
+                            == 0x21070001) {
+                        setDefaultFileCompression(CompressionAlgorithmTags.UNCOMPRESSED);
+                    }
+
+                    // migrate away from MD5
+                    if (mSharedPreferences.getInt(Constants.Pref.DEFAULT_HASH_ALGORITHM, 0)
+                            == HashAlgorithmTags.MD5) {
+                        setDefaultHashAlgorithm(HashAlgorithmTags.SHA256);
+                    }
                 }
-                if (server.equals("pool.sks-keyservers.net")) {
-                    // use HKPS!
-                    it.set("hkps://hkps.pool.sks-keyservers.net");
-                } else if (server.equals("pgp.mit.edu")) {
-                    // use HKPS!
-                    it.set("hkps://pgp.mit.edu");
-                } else if (server.equals("subkeys.pgp.net")) {
-                    // remove, because often down and no HKPS!
-                    it.remove();
+                // fall through
+                case 4: {
+                    // for compatibility: change from SHA512 to SHA256
+                    if (mSharedPreferences.getInt(Constants.Pref.DEFAULT_HASH_ALGORITHM, 0)
+                            == HashAlgorithmTags.SHA512) {
+                        setDefaultHashAlgorithm(HashAlgorithmTags.SHA256);
+                    }
                 }
-
             }
-            setKeyServers(servers.toArray(new String[servers.size()]));
+
+            // write new preference version
             mSharedPreferences.edit()
-                    .putInt(Constants.Pref.KEY_SERVERS_DEFAULT_VERSION, Constants.Defaults.KEY_SERVERS_VERSION)
+                    .putInt(Constants.Pref.PREF_DEFAULT_VERSION, Constants.Defaults.PREF_VERSION)
                     .commit();
         }
-
-        // migrate old uncompressed constant to new one
-        if (mSharedPreferences.getInt(Constants.Pref.DEFAULT_FILE_COMPRESSION, 0) == 0x21070001) {
-            setDefaultFileCompression(CompressionAlgorithmTags.UNCOMPRESSED);
-        }
-
-        // migrate away from MD5
-        if (mSharedPreferences.getInt(Constants.Pref.DEFAULT_HASH_ALGORITHM, 0) == HashAlgorithmTags.MD5) {
-            setDefaultHashAlgorithm(HashAlgorithmTags.SHA512);
-        }
     }
 }
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