add aes and ecdsa sources

ecdsa/curves.py

@@ -0,0 +1,41 @@
+import der, ecdsa
+
+class UnknownCurveError(Exception):
+    pass
+
+def orderlen(order):
+    return (1+len("%x"%order))//2 # bytes
+
+# the NIST curves
+class Curve:
+    def __init__(self, name, curve, generator, oid):
+        self.name = name
+        self.curve = curve
+        self.generator = generator
+        self.order = generator.order()
+        self.baselen = orderlen(self.order)
+        self.verifying_key_length = 2*self.baselen
+        self.signature_length = 2*self.baselen
+        self.oid = oid
+        self.encoded_oid = der.encode_oid(*oid)
+
+NIST192p = Curve("NIST192p", ecdsa.curve_192, ecdsa.generator_192,
+                 (1, 2, 840, 10045, 3, 1, 1))
+NIST224p = Curve("NIST224p", ecdsa.curve_224, ecdsa.generator_224,
+                 (1, 3, 132, 0, 33))
+NIST256p = Curve("NIST256p", ecdsa.curve_256, ecdsa.generator_256,
+                 (1, 2, 840, 10045, 3, 1, 7))
+NIST384p = Curve("NIST384p", ecdsa.curve_384, ecdsa.generator_384,
+                 (1, 3, 132, 0, 34))
+NIST521p = Curve("NIST521p", ecdsa.curve_521, ecdsa.generator_521,
+                 (1, 3, 132, 0, 35))
+
+curves = [NIST192p, NIST224p, NIST256p, NIST384p, NIST521p]
+
+def find_curve(oid_curve):
+    for c in curves:
+        if c.oid == oid_curve:
+            return c
+    raise UnknownCurveError("I don't know about the curve with oid %s."
+                            "I only know about these: %s" %
+                            (oid_curve, [c.name for c in curves]))