Fix issues with missing package and update documentation.

README.md

@@ -10,17 +10,40 @@ Full writeup is at: https://matt.sh/signal-backup
 
 To backup your Signal Desktop database, run the following commands to:
 
-- check out SCAB
-- install Python requirements
-- copy your Signal Desktop database (and attachments) into a new directory so nothing is read against your live Signal DB
-- generate a single local HTML page web viewer for all your conversations
+-   Check out SCAB
+-   Install Python requirements
+-   Copy your Signal Desktop database (and attachments) into a new directory so nothing is read against your live Signal DB
+-   Generate a single local HTML page web viewer for all your conversations
 
-```erlang
+`pysqlcipher3` now has to be compiled from source:
+
+```sh
+git clone https://github.com/rigglemania/pysqlcipher3.git
+```
+
+# Linux:
+
+```sh
+sudo apt-get install libsqlcipher-dev
+```
+
+# Mac:
+
+```sh
+brew install sqlcipher
+```
+
+```sh
+python3 setup.py build
+python3 setup.py install
+```
+
+```sh
 git clone https://github.com/mattsta/signal-backup
-pip3 install -r requirements.txt
 cd signal-backup
+pip3 install -r requirements.txt
 rsync -avz "/Users/$(whoami)/Library/Application Support/Signal" Signal-Archive
-cd Signal-Archive
-python3 ../scab.py
+cd Signal-Archive/Signal
+python3 ../../scab.py
 open myConversations.html
 ```

scab.py

@@ -27,10 +27,11 @@
 # param binding doesn't work for pragmas, so use a direct string concat
 for cursor in [c, c2]:
     cursor.execute(f'PRAGMA KEY = "x\'{key}\'"')
-    cursor.execute(f'PRAGMA cipher_page_size = 1024')
-    cursor.execute(f'PRAGMA kdf_iter = 64000')
-    cursor.execute(f'PRAGMA cipher_hmac_algorithm = HMAC_SHA1')
-    cursor.execute(f'PRAGMA cipher_kdf_algorithm = PBKDF2_HMAC_SHA1')
+    # These break pysqlcipher3:
+    # cursor.execute(f'PRAGMA cipher_page_size = 1024')
+    # cursor.execute(f'PRAGMA kdf_iter = 64000')
+    # cursor.execute(f'PRAGMA cipher_hmac_algorithm = HMAC_SHA1')
+    # cursor.execute(f'PRAGMA cipher_kdf_algorithm = PBKDF2_HMAC_SHA1')
 
 # Hold numeric user id to conversation/user names
 conversations = {}