cleaned up documentation

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

diff --git a/ctypescrypto/ec.py b/ctypescrypto/ec.py
new file mode 100644 (file)
index 0000000..d325212
--- /dev/null
+++ b/ctypescrypto/ec.py
@@ -0,0 +1,33 @@
+"""
+Support for EC keypair operation missing form public libcrypto API
+"""
+
+
+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)
+
+
+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