Updated test script
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ekta-v
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@ -159,13 +159,13 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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OpenSSL.BN_mod_add(self.m_, self.m_, self.a, self.n, self.ctx)
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return self.m_
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def blind_sign(self, m_):
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def blind_sign(self,keypair, m_):
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"""
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Signer blind-signs the request
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"""
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self.m_ = m_
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self.s_ = OpenSSL.BN_new()
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OpenSSL.BN_mod_mul(self.s_, self.keypair[0], self.m_, self.n, self.ctx)
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OpenSSL.BN_mod_mul(self.s_, keypair, self.m_, self.n, self.ctx)
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OpenSSL.BN_mod_add(self.s_, self.s_, self.k, self.n, self.ctx)
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return self.s_
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@ -208,3 +208,4 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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raise RuntimeError("EC_POINT_cmp returned an error")
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else:
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return retval == 0
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@ -4,9 +4,19 @@ Test for ECC blind signatures
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import os
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import unittest
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from ctypes import cast, c_char_p
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from pybitmessage.pyelliptic.eccblind import ECCBlind
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from pybitmessage.pyelliptic.openssl import OpenSSL
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import sys
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sys.path.insert(1, '/home/cis/Peter_DebPackage/blindsig_Task/PyBitmessage/src/pyelliptic')
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from eccblind import ECCBlind
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from openssl import OpenSSL
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import msgpack
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from datetime import datetime
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from datetime import timedelta
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import timedelta
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cur = datetime.now()
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def encode_datetime(obj):
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return {'__datetime__': True, 'as_str': obj.strftime("%Y%m%dT%H:%M:%S.%f")}
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#from .src.pyelliptic.eccblind import ECCBlind
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#from .src.pyelliptic.openssl import OpenSSL
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class TestBlindSig(unittest.TestCase):
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@ -14,39 +24,88 @@ class TestBlindSig(unittest.TestCase):
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Test case for ECC blind signature
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"""
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def test_blind_sig(self):
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import pdb;pdb.set_trace()
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# Local varaible if verify method is called separately aftercomplete chain of signatures
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i = 0 #Loop variable to initiate signature in chain format
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signature_list = [] #Stores the signature as per the order of signing on the msg
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signer_obj_list = [] #Stores the signer as per the order of signing on the msg
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msg_list = [] #Stores the msg as per the order of signing on the msg
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keypair_list=[]
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signature_blinded_list=[]
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"""Test full sequence using a random certifier key and a random message"""
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# See page 127 of the paper
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# (1) Initialization
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signer_obj = ECCBlind()
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point_r = signer_obj.signer_init()
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print("**********WELCOME*********************")
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# Metadata for msg as well as second signer pubkey
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cur = datetime.now()
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exp = datetime.now()+(timedelta.Timedelta(days = 360))
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msg = {"msg":"Hello from CIS","Name": "CIS", "created": cur , "expiry": exp, }
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keymetadata = {"PubKey_Name" :"PUBKEY_CIS","PubKey_create_Date": cur , "PubKey_expiry_Date": exp,}
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signer_obj = ECCBlind()#certify
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signer_obj_list.append(signer_obj)
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keypair_list.append(signer_obj_list[i].keypair[0]) #List of private keys of signers
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k = 1;
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# (2) Request
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requester_obj = ECCBlind(pubkey=signer_obj.pubkey)
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# only 64 byte messages are planned to be used in Bitmessage
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msg = os.urandom(64)
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msg_blinded = requester_obj.create_signing_request(point_r, msg)
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while i <= 2:
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second_signer = ECCBlind()
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signer_obj_list.append(second_signer)
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point_r = signer_obj_list[i].signer_init()
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point_r_second = signer_obj_list[k].signer_init() #Random number as per the second signer
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msg_key = {"pubkey":signer_obj_list[k].pubkey}
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msg = msgpack.packb([msg,msg_key], default=encode_datetime, use_bin_type=True) #Msg packed with second pubkey
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msg_list.append(msg)
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requester_obj = ECCBlind(pubkey=signer_obj_list[i].pubkey) #Requestor with first signer pubkey
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msg_blinded = requester_obj.create_signing_request(point_r_second, msg) # Creating signing request with second signer random number
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msg_blinded_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(msg_blinded))
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OpenSSL.BN_bn2bin(msg_blinded, msg_blinded_str)
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signature_blinded = signer_obj_list[k].blind_sign(keypair_list[i],msg_blinded) # Submitting blind sign request with private key 0
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signature = requester_obj.unblind(signature_blinded)
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signature_blinded_list.append(signature)
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signature_blinded_str = OpenSSL.malloc(0,
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OpenSSL.BN_num_bytes(
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signature_blinded))
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signature_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(signature[0]))
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OpenSSL.BN_bn2bin(signature_blinded, signature_blinded_str)
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OpenSSL.BN_bn2bin(signature[0], signature_str)
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self.assertNotEqual(cast(signature_str, c_char_p).value,
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cast(signature_blinded_str, c_char_p).value)
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# verifier_obj = ECCBlind(pubkey=signer_obj_list[i].pubkey) # Verifier object initialised with certifier object
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# self.assertTrue(verifier_obj.verify(msg, signature))
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# msg = msgpack.unpackb(msg)
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# print("Msg at line 87 is ",msg)
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# Test level counters
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i = i + 1
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k = k + 1
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keypair_list.append(signer_obj_list[i].keypair[0]) # Assigned the next level keys for the next index
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print("KeyPair list at line 94 is",keypair_list)
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print("Signature blinded list at line 95 is ",signature_blinded_list)
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# check
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msg_blinded_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(msg_blinded))
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OpenSSL.BN_bn2bin(msg_blinded, msg_blinded_str)
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self.assertNotEqual(msg, cast(msg_blinded_str, c_char_p).value)
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# Verify is can be called once all the signature is performed.
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k = 2
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while k >= 0:
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print("Value of msg variable at line 107 is ********",msg_list[k])
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verifier_obj = ECCBlind(pubkey=signer_obj_list[k].pubkey)
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self.assertTrue(verifier_obj.verify(msg_list[k], signature_blinded_list[k]))
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print("Msg verified at line 91 for ",k,"+th index")
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msg = msgpack.unpackb(msg_list[k])
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print("Unpacked data is ",msg)
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k = k - 1
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# (3) Signature Generation
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signature_blinded = signer_obj.blind_sign(msg_blinded)
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# (4) Extraction
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signature = requester_obj.unblind(signature_blinded)
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# check
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signature_blinded_str = OpenSSL.malloc(0,
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OpenSSL.BN_num_bytes(
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signature_blinded))
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signature_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(signature[0]))
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OpenSSL.BN_bn2bin(signature_blinded, signature_blinded_str)
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OpenSSL.BN_bn2bin(signature[0], signature_str)
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self.assertNotEqual(cast(signature_str, c_char_p).value,
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cast(signature_blinded_str, c_char_p).value)
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# (5) Verification
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verifier_obj = ECCBlind(pubkey=signer_obj.pubkey)
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self.assertTrue(verifier_obj.verify(msg, signature))
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obj = TestBlindSig('test_blind_sig')
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obj.test_blind_sig()
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