added priv key generation for hd wallet, added interfaces for offline txn signing

Author: Vizeet Srivastava

hd_wallet.py

@@ -3,12 +3,34 @@
 import hmac
 import pbkdf2
 import binascii
+import optparse
 
-def generate_seed_from_str(code: str, seed: str):
-        seed = pbkdf2.pbkdf2(hashlib.sha512, code, seed, 2048, 64)
+def generateSeedFromStr(code: str, salt: str):
+        seed = pbkdf2.pbkdf2(hashlib.sha512, code, salt, 2048, 64)
         print('seed = %s' % bytes.decode(binascii.hexlify(seed)))
         return seed
 
+def generatePrivateKey(seed: bytes, code: str):
+        h = hmac.new(seed, code.encode('utf-8'), hashlib.sha512).digest()
+        private_key = h[0:32]
+        chaincode = h[32:64]
+        return private_key, chaincode
+
+# K = k * G
+def getPubkeyFromPrivkey(private_key: bytes):
+        pass
+
 if __name__ == '__main__':
+        parser = optparse.OptionParser(usage="python3 hd_wallet.py -s <Salt>")
+        parser.add_option('-s', '--salt', action='store', dest='salt', help='Add salt to secret')
+        (args, _) = parser.parse_args()
+        if args.salt == None:
+                logging.error ("Missing required argument")
+                sys.exit(1)
+
         mnemonic_code = mnemonic_code.getMnemonicWordCodeString()
-        generate_seed_from_str(mnemonic_code, 'testnewseed')
+        seed = generateSeedFromStr(mnemonic_code, args.salt)
+
+        private_key, chaincode = generatePrivateKey(seed, mnemonic_code)
+
+        print('privake key = %s' % bytes.decode(binascii.hexlify(private_key)))

isolated_system_api_interface_definitions.py

@@ -0,0 +1,23 @@
+def getNewAddress():
+        pass
+
+def pushRawP2PKHTxn():
+        pass
+
+def pushRawP2SHTxn():
+        pass
+
+def pushRawBareP2WPKHTxn():
+        pass
+
+def pushRawBareP2WSHTxn():
+        pass
+
+def pushRawP2SH_P2WPKHTxn():
+        pass
+
+def pushRawP2SH_P2WSHTxn():
+        pass
+
+def getSignedTxn():
+        pass

perform_transaction.py

@@ -0,0 +1,16 @@
+import requests
+
+def getUnspentTxnList(address: str):
+        url = 'https://blockchain.info/unspent?active=%s' % address
+        response = requests.get(url)
+        jsonobj = json.loads(response.text)
+        return jsonobj
+
+# just be little smart here
+def selectUnspentTxnsForAmount(jsonobj, amount: str):
+        pass
+
+def askNewAddress():
+        pass
+
+def 

random_number_generator.py

@@ -44,11 +44,21 @@ def getRawMicOutput():
 
 def get256BitRandomNumber():
         h = hashlib.sha256()
+
+        # update with raw camera output
         raw_photo = getRawCameraOutput()
         h.update(raw_photo)
+
+        # update with raw mic output
         raw_sound = getRawMicOutput()
-        print('raw sound = %s' % bytes.decode(binascii.hexlify(raw_sound)))
+#        print('raw sound = %s' % bytes.decode(binascii.hexlify(raw_sound)))
         h.update(raw_sound)
+
+        # update with system random number
+        sys_rand = '%x' % random.SystemRandom().randint(0, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
+        sys_rand_b = binascii.unhexlify(sys_rand)
+        h.update(sys_rand_b)
+
         h_b = h.digest()
         return h_b