-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=libcrypto.EC_KEY_new_by_curve_name(curve.nid)
- if ec is None:
- raise PKeyError("EC_KEY_new_by_curvename")
- group=libcrypto.EC_KEY_get0_group(ec)
- 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):
- 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,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,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)
- p=libcrypto.EVP_PKEY_new()
- if p is None:
- raise PKeyError("EVP_PKEY_new")
- if libcrypto.EVP_PKEY_set1_EC_KEY(p,ec)<=0:
- raise PKeyError("EVP_PKEY_set1_EC_KEY")
- 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_free.argtypes=(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.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)