Index: portage_checksum.py
===================================================================
--- portage_checksum.py	(revision 74)
+++ portage_checksum.py	(revision 87)
@@ -22,6 +22,12 @@
 #dict of all available hash functions
 hashfunc_map = {}
 
+# This is only available in Python 2.5
+try:
+	import hashlib
+except ImportError:
+	hashlib = None
+
 # We _try_ to load this module. If it fails we do the slightly slower fallback.
 try:
 	import fchksum
@@ -32,11 +38,11 @@
 except ImportError:
 	import md5
 	def md5hash(filename):
-		return pyhash(filename, md5)
+		return pyhash(filename, md5.new)
 hashfunc_map["MD5"] = md5hash
 
 def sha1hash(filename):
-	return pyhash(filename, sha)
+	return pyhash(filename, sha.new)
 hashfunc_map["SHA1"] = sha1hash
 	
 # Keep pycrypto optional for now, there are no internal fallbacks for these
@@ -44,19 +50,33 @@
 	import Crypto.Hash.SHA256
 	
 	def sha256hash(filename):
-		return pyhash(filename, Crypto.Hash.SHA256)
+		return pyhash(filename, Crypto.Hash.SHA256.new)
 	hashfunc_map["SHA256"] = sha256hash
 except ImportError:
-	pass
+	if hashlib != None:
+		def sha256hash(filename):
+			return pyhash(filename, hashlib.sha256)
+		hashfunc_map["SHA256"] = sha256hash
 
 try:
 	import Crypto.Hash.RIPEMD
 	
 	def rmd160hash(filename):
-		return pyhash(filename, Crypto.Hash.RIPEMD)
+		return pyhash(filename, Crypto.Hash.RIPEMD.new)
 	hashfunc_map["RMD160"] = rmd160hash
 except ImportError:
-	pass
+	if hashlib != None:
+		# Even if hashlib is available, it's not guaranteed
+		# to support ripemd160, so check first
+		try:
+			hashlib.new('ripemd160')
+		except ValueError:
+			pass
+		else:
+			def rmd160hash(filename):
+				return pyhash(filename, lambda:hashlib.new('ripemd160'))
+			hashfunc_map["RMD160"] = rmd160hash
+			
 
 def getsize(filename):
 	size = os.stat(filename).st_size
@@ -111,12 +131,12 @@
 					break
 	return file_is_ok,reason
 
-def pyhash(filename, hashobject):
+def pyhash(filename, hashfactory):
 	f = open(filename, 'rb')
 	blocksize = HASHING_BLOCKSIZE
 	data = f.read(blocksize)
 	size = 0L
-	sum = hashobject.new()
+	sum = hashfactory()
 	while data:
 		sum.update(data)
 		size = size + len(data)