Don't use BMConfigParser in highlevelcrypto, instead use digestAlg kwarg

src/class_singleWorker.py

@@ -50,6 +50,8 @@ class singleWorker(StoppableThread):
 
     def __init__(self):
         super(singleWorker, self).__init__(name="singleWorker")
+        self.digestAlg = BMConfigParser().safeGet(
+            'bitmessagesettings', 'digestalg', 'sha256')
         proofofwork.init()
 
     def stopThread(self):
@@ -368,7 +370,8 @@ class singleWorker(StoppableThread):
         payload += encodeVarint(BMConfigParser().getint(
             myAddress, 'payloadlengthextrabytes'))
 
-        signature = highlevelcrypto.sign(payload, privSigningKeyHex)
+        signature = highlevelcrypto.sign(
+            payload, privSigningKeyHex, self.digestAlg)
         payload += encodeVarint(len(signature))
         payload += signature
 
@@ -455,8 +458,7 @@ class singleWorker(StoppableThread):
         ).digest()).digest()
         payload += doubleHashOfAddressData[32:]  # the tag
         signature = highlevelcrypto.sign(
-            payload + dataToEncrypt, privSigningKeyHex
-        )
+            payload + dataToEncrypt, privSigningKeyHex, self.digestAlg)
         dataToEncrypt += encodeVarint(len(signature))
         dataToEncrypt += signature
 
@@ -641,7 +643,7 @@ class singleWorker(StoppableThread):
             dataToSign = payload + dataToEncrypt
 
             signature = highlevelcrypto.sign(
-                dataToSign, privSigningKeyHex)
+                dataToSign, privSigningKeyHex, self.digestAlg)
             dataToEncrypt += encodeVarint(len(signature))
             dataToEncrypt += signature
 
@@ -1223,7 +1225,8 @@ class singleWorker(StoppableThread):
             payload += fullAckPayload
             dataToSign = pack('>Q', embeddedTime) + '\x00\x00\x00\x02' + \
                 encodeVarint(1) + encodeVarint(toStreamNumber) + payload
-            signature = highlevelcrypto.sign(dataToSign, privSigningKeyHex)
+            signature = highlevelcrypto.sign(
+                dataToSign, privSigningKeyHex, self.digestAlg)
             payload += encodeVarint(len(signature))
             payload += signature
 

src/highlevelcrypto.py

@@ -13,7 +13,6 @@ import pyelliptic
 from pyelliptic import OpenSSL
 from pyelliptic import arithmetic as a
 
-from bmconfigparser import BMConfigParser
 
 __all__ = ['encrypt', 'makeCryptor', 'pointMult', 'privToPub', 'sign', 'verify']
 
@@ -67,22 +66,17 @@ def decryptFast(msg, cryptor):
     return cryptor.decrypt(msg)
 
 
-def sign(msg, hexPrivkey):
+def sign(msg, hexPrivkey, digestAlg="sha256"):
     """
     Signs with hex private key using SHA1 or SHA256 depending on
-    "digestalg" setting
+    *digestAlg* keyword.
     """
-    digestAlg = BMConfigParser().safeGet(
-        'bitmessagesettings', 'digestalg', 'sha256')
-    if digestAlg == "sha1":
-        # SHA1, this will eventually be deprecated
-        return makeCryptor(hexPrivkey).sign(
-            msg, digest_alg=OpenSSL.digest_ecdsa_sha1)
-    elif digestAlg == "sha256":
-        # SHA256. Eventually this will become the default
-        return makeCryptor(hexPrivkey).sign(msg, digest_alg=OpenSSL.EVP_sha256)
-    else:
+    if digestAlg not in ("sha1", "sha256"):
         raise ValueError("Unknown digest algorithm %s" % digestAlg)
+    # SHA1, this will eventually be deprecated
+    return makeCryptor(hexPrivkey).sign(
+        msg, digest_alg=OpenSSL.digest_ecdsa_sha1
+        if digestAlg == "sha1" else OpenSSL.EVP_sha256)
 
 
 def verify(msg, sig, hexPubkey):