Refile m2crypto driver

svn path=/pow/POW-0.7/pkix-m2crypto-driver.py; revision=1097

1 files changed, 42 insertions, 0 deletions

diff --git a/pow/POW-0.7/pkix-m2crypto-driver.py b/pow/POW-0.7/pkix-m2crypto-driver.py
new file mode 100644
index 00000000..61dabac7
--- /dev/null
+++ b/pow/POW-0.7/pkix-m2crypto-driver.py
@@ -0,0 +1,42 @@
+# $Id$
+
+"""Crypto driver for POW.pkix using M2Crypto.
+
+This driver is part of an attempt to salvage the (really nice)
+POW.pkix code from the POW package.  I like POW well enough, but it's
+old and missing some pieces and the Python world seems to have moved
+to M2Crypto.  But M2Crypto has nothing like POW.pkix, so I whacked
+together an interface to let POW.pkix run over other crypto packages.
+
+This module is a driver for M2Crypto.
+"""
+
+# NB: Module names may change eventually
+
+import POW.pkix
+
+class M2CryptoCryptoDriver(POW.pkix.CryptoDriver):
+  """Dispatcher for crypto calls using M2Crypto package."""
+
+  def __init__(self):
+    import M2Crypto
+    self.driver2OID = {
+      "md5"       :  (1, 2, 840, 113549, 1, 1, 4),    # md5WithRSAEncryption
+      "sha1"      :  (1, 2, 840, 113549, 1, 1, 5),    # sha1withRSAEncryption
+      "ripemd160" :  (1, 2, 840, 113549, 1, 1, 6),    # ripemd160WithRSAEncryption
+      "sha256"    :  (1, 2, 840, 113549, 1, 1, 11),   # sha256WithRSAEncryption
+      }
+    self.OID2driver = dict((v,k) for k,v in self.driver2OID.iteritems())
+
+  def sign(self, key, oid, plaintext):
+    digest = M2Crypto.EVP.MessageDigest(self.OID2driver[oid])
+    digest.update(plaintext)
+    return key.sign(digest.final(), self.OID2driver[oid])
+
+  def verify(self, key, oid, plaintext, signature):
+    return key.verify(plaintext, signature, self.OID2driver[oid])
+
+  def keyDER(self, key):
+    bio = M2Crypto.BIO.MemoryBuffer()
+    key.save_key_der_bio(bio)
+    return bio.read()