ctypescrypto/ec.py

   1 """
   2 Support for EC keypair operation missing form public libcrypto API
   3 """
   4
   5
   6 def create(curve,num):
   7         """
   8                 Creates EC keypair from the just secret key and curve name
   9
  10                 @param curve - name of elliptic curve
  11                 @param num - long number representing key
  12         """
  13         p=libcrypto.EVP_PKEY_new()
  14         ec=libcrypto.EC_KEY_new_by_curvename(curve.nid)
  15         group=libcrypto.EC_KEY_get0_group(ec)
  16         EC_KEY_set_private_key(ec,bn)
  17         priv_key=libcrypt.BN_new()
  18         ctx=BN_CTX_new()
  19         h="%x"%(num)
  20         libcrypto.BN_hex2bn(byref(priv_key),h)
  21         libcrypto.EC_KEY_set_private_key(ec,priv_key)
  22         pub_key=libcrypto.EC_POINT_new(group)
  23         libcrypto.EC_POINT_mul(group,pub_key,priv_key,None,None,ctx)
  24         libcrypto.BN_free(a)
  25         libcrypto.EVP_PKEY_set1_EC_KEY(p,ec)
  26         libcrypto.EC_KEY_free(ec)
  27         return PKey(ptr=p,cansign=True)
  28
  29
  30 libcrypto.EVP_PKEY_new.restype=c_void_p
  31 libcrypto.BN_new.restype=c_void_p
  32 libcrypto.BN_hex2bn.argtypes(POINTER(c_void_p),c_char_p)
  33 libcrypto.EC_KEY_set_private_key