Merge pull request #5 from parneshraniga/master

[oss/ctypescrypto.git] / ctypescrypto / ec.py

diff --git a/ctypescrypto/ec.py b/ctypescrypto/ec.py
index d325212c7781d196b1d416575436a5e1845005fe..b42cfd441c0c41e66db65871647b777bdab74c65 100644 (file)
--- a/ctypescrypto/ec.py
+++ b/ctypescrypto/ec.py
@@ -1,33 +1,91 @@
 """
 Support for EC keypair operation missing form public libcrypto API
 """
+from ctypescrypto.pkey import PKey, PKeyError
+from ctypes import c_void_p, c_char_p, c_int, byref, POINTER
+from ctypescrypto import libcrypto
 
+__all__ = ['create']
 
-def create(curve,num):
-       """
-               Creates EC keypair from the just secret key and curve name
-               
-               @param curve - name of elliptic curve
-               @param num - long number representing key
-       """
-       p=libcrypto.EVP_PKEY_new()
-       ec=libcrypto.EC_KEY_new_by_curvename(curve.nid)
-       group=libcrypto.EC_KEY_get0_group(ec)
-       EC_KEY_set_private_key(ec,bn)
-       priv_key=libcrypt.BN_new()
-       ctx=BN_CTX_new()
-       h="%x"%(num)
-       libcrypto.BN_hex2bn(byref(priv_key),h)
-       libcrypto.EC_KEY_set_private_key(ec,priv_key)
-       pub_key=libcrypto.EC_POINT_new(group)
-       libcrypto.EC_POINT_mul(group,pub_key,priv_key,None,None,ctx)
-       libcrypto.BN_free(a)
-       libcrypto.EVP_PKEY_set1_EC_KEY(p,ec)
-       libcrypto.EC_KEY_free(ec)
-       return PKey(ptr=p,cansign=True)
+def create(curve, data):
+    """
+    Creates EC keypair from the just secret key and curve name
 
+    @param curve - name of elliptic curve
+    @param num - byte array or long number representing key
+    """
+    ec_key = libcrypto.EC_KEY_new_by_curve_name(curve.nid)
+    if ec_key is None:
+        raise PKeyError("EC_KEY_new_by_curvename")
+    group = libcrypto.EC_KEY_get0_group(ec_key)
+    if group is None:
+        raise PKeyError("EC_KEY_get0_group")
+    libcrypto.EC_GROUP_set_asn1_flag(group, 1)
+    raw_key = libcrypto.BN_new()
+    if isinstance(data, int):
+        libcrypto.BN_hex2bn(byref(raw_key), hex(data))
+    else:
+        if raw_key is None:
+            raise PKeyError("BN_new")
+        if libcrypto.BN_bin2bn(data, len(data), raw_key) is None:
+            raise PKeyError("BN_bin2bn")
+    ctx = libcrypto.BN_CTX_new()
+    if ctx is None:
+        raise PKeyError("BN_CTX_new")
+    order = libcrypto.BN_new()
+    if order is None:
+        raise PKeyError("BN_new")
+    priv_key = libcrypto.BN_new()
+    if priv_key is None:
+        raise PKeyError("BN_new")
+    if libcrypto.EC_GROUP_get_order(group, order, ctx) <= 0:
+        raise PKeyError("EC_GROUP_get_order")
+    if libcrypto.BN_nnmod(priv_key, raw_key, order, ctx) <= 0:
+        raise PKeyError("BN_nnmod")
+    if libcrypto.EC_KEY_set_private_key(ec_key, priv_key) <= 0:
+        raise PKeyError("EC_KEY_set_private_key")
+    pub_key = libcrypto.EC_POINT_new(group)
+    if pub_key is None:
+        raise PKeyError("EC_POINT_new")
+    if libcrypto.EC_POINT_mul(group, pub_key, priv_key, None, None, ctx) <= 0:
+        raise PKeyError("EC_POINT_mul")
+    if libcrypto.EC_KEY_set_public_key(ec_key, pub_key) <= 0:
+        raise PKeyError("EC_KEY_set_public_key")
+    libcrypto.BN_free(raw_key)
+    libcrypto.BN_free(order)
+    libcrypto.BN_free(priv_key)
+    libcrypto.BN_CTX_free(ctx)
+    pkey = libcrypto.EVP_PKEY_new()
+    if pkey is None:
+        raise PKeyError("EVP_PKEY_new")
+    if libcrypto.EVP_PKEY_set1_EC_KEY(pkey, ec_key) <= 0:
+        raise PKeyError("EVP_PKEY_set1_EC_KEY")
+    libcrypto.EC_KEY_free(ec_key)
+    return PKey(ptr=pkey, cansign=True)
 
-libcrypto.EVP_PKEY_new.restype=c_void_p
-libcrypto.BN_new.restype=c_void_p
-libcrypto.BN_hex2bn.argtypes(POINTER(c_void_p),c_char_p)
-libcrypto.EC_KEY_set_private_key
+libcrypto.EVP_PKEY_new.restype = c_void_p
+libcrypto.EC_KEY_new_by_curve_name.restype = c_void_p
+libcrypto.EC_KEY_new_by_curve_name.argtypes = (c_int,)
+libcrypto.BN_new.restype = c_void_p
+libcrypto.BN_free.argtypes = (c_void_p, )
+libcrypto.BN_hex2bn.argtypes = (POINTER(c_void_p), c_char_p)
+libcrypto.BN_bin2bn.argtypes = ( c_char_p, c_int, c_void_p)
+libcrypto.BN_bin2bn.restype = c_void_p
+libcrypto.BN_CTX_new.restype = c_void_p
+libcrypto.BN_CTX_free.argtypes = (c_void_p, )
+libcrypto.BN_bin2bn.argtypes = (c_char_p, c_int, c_void_p)
+libcrypto.BN_nnmod.restype = c_int
+libcrypto.BN_nnmod.argtypes = (c_void_p, c_void_p, c_void_p, c_void_p)
+libcrypto.EC_KEY_set_private_key.argtypes = (c_void_p, c_void_p)
+libcrypto.EC_POINT_new.argtypes = (c_void_p, )
+libcrypto.EC_POINT_new.restype = c_void_p
+libcrypto.EC_POINT_mul.argtypes = (c_void_p, c_void_p, c_void_p, c_void_p,
+                                   c_void_p, c_void_p)
+libcrypto.EC_KEY_set_public_key.argtypes = (c_void_p, c_void_p)
+libcrypto.EC_KEY_get0_group.restype = c_void_p
+libcrypto.EC_KEY_get0_group.argtypes = (c_void_p,)
+libcrypto.EC_KEY_free.argtypes=(c_void_p,)
+libcrypto.EVP_PKEY_set1_EC_KEY.argtypes = (c_void_p, c_void_p)
+libcrypto.EC_GROUP_set_asn1_flag.argtypes = (c_void_p, c_int)
+libcrypto.EC_GROUP_get_order.restype = c_int
+libcrypto.EC_GROUP_get_order.argtypes = (c_void_p, c_void_p, c_void_p)