def locate_pack_recipient_key(recipients: Sequence[dict], my_verkey: bytes, my_sigkey: bytes) -> (bytes, str, str): """ Locate pack recipient key. Decode the encryption key and sender verification key from a corresponding recipient block, if any is defined. Args: recipients: Recipients to locate find_key: Function used to find private key Returns: A tuple of (cek, sender_vk, recip_vk_b58) Raises: ValueError: If no corresponding recipient key found """ not_found = [] for recip in recipients: if not recip or "header" not in recip or "encrypted_key" not in recip: raise ValueError("Invalid recipient header") recip_vk_b58 = recip["header"].get("kid") if bytes_to_b58(my_verkey) != recip_vk_b58: not_found.append(recip_vk_b58) continue recip_vk = b58_to_bytes(recip_vk_b58) pk = pysodium.crypto_sign_pk_to_box_pk(my_verkey) sk = pysodium.crypto_sign_sk_to_box_sk(my_sigkey) encrypted_key = b64_to_bytes(recip["encrypted_key"], urlsafe=True) nonce_b64 = recip["header"].get("iv") nonce = b64_to_bytes(nonce_b64, urlsafe=True) if nonce_b64 else None sender_b64 = recip["header"].get("sender") enc_sender = b64_to_bytes(sender_b64, urlsafe=True) if sender_b64 else None if nonce and enc_sender: sender_vk_bin = pysodium.crypto_box_seal_open(enc_sender, pk, sk) sender_vk = sender_vk_bin.decode("ascii") sender_pk = pysodium.crypto_sign_pk_to_box_pk( b58_to_bytes(sender_vk_bin)) cek = pysodium.crypto_box_open(encrypted_key, nonce, sender_pk, sk) else: sender_vk = None cek = pysodium.crypto_box_seal_open(encrypted_key, pk, sk) return cek, sender_vk, recip_vk_b58 raise ValueError( "No corresponding recipient key found in {}".format(not_found))
def handle(self): data, socket = self.request unsealed = pysodium.crypto_box_seal_open(data, pk, sk) ap = unsealed[:pysodium.crypto_box_PUBLICKEYBYTES] challenge = unsealed[pysodium.crypto_box_PUBLICKEYBYTES:] packets.append(ap) nonce = pysodium.randombytes(pysodium.crypto_box_NONCEBYTES) response = pysodium.crypto_box(challenge, nonce, ap, sk) dst = (src2dst(self.client_address[0]), REG_PORT) socket.setsockopt(SOL_SOCKET, SO_BROADCAST, 1) socket.sendto(nonce + response, dst)
def decrypt_news(news_item): assert ('to' in news_item) # Message was sent to a team, so we need to decode and decrypt it decoded_msg = b64decode(news_item['msg'].encode("utf-8")) try: team_pk, team_sk = team['crypt_pk'], TeamSecrets['crypt_sk'] decrypted_msg = pysodium.crypto_box_seal_open( decoded_msg, team_pk, team_sk) except: decrypted_msg = b'<Failed to decrypt>' news_item['msg'] = decrypted_msg.decode("utf-8") return news_item
def test0(): if not pysodium.sodium_version_check(1, 0, 9): return pk, sk = pysodium.crypto_box_keypair() #print(pk) #print(sk) p = binascii.hexlify(pk) s = binascii.hexlify(sk) print(p) print(s) c = pysodium.crypto_box_seal(b"passwd", pk) print(binascii.hexlify(c)) print(pysodium.crypto_box_seal_open(c, pk, sk))
def decrypt_report(self, encrypted_report_blob): """ Decrypt a report blob using libnacl public encryption or throw an exception if in case there is a problem with decryption Args: report: The report as json string in base64 encoding Returns: The original report. """ return pysodium.crypto_box_seal_open( base64.decodestring(encrypted_report_blob), self.receiver_pub_key, self.receiver_secret_key)
def anon_decrypt_message(enc_message: bytes, secret: bytes) -> bytes: """ Apply anon_decrypt to a binary message. Args: enc_message: The encrypted message secret: The seed to use Returns: The decrypted message """ sign_pk, sign_sk = create_keypair(secret) pk = pysodium.crypto_sign_pk_to_box_pk(sign_pk) sk = pysodium.crypto_sign_sk_to_box_sk(sign_sk) message = pysodium.crypto_box_seal_open(enc_message, pk, sk) return message
def data_received(self, data): if verbose: print('Data received: ', data, file=sys.stderr) try: data = pysodium.crypto_sign_open(data, self.handler.getserverkey()) except ValueError: raise ValueError('invalid signature.\nabort') if data != b'ok' and (data[:-42] == b'fail' or len(data) != sphinxlib.DECAF_255_SER_BYTES + 90): raise ValueError('fail') if not self.b: self.cb() return rwd = sphinxlib.finish(self.pwd, self.b, data[:sphinxlib.DECAF_255_SER_BYTES]) if self.handler.namesite is not None: if self.handler.namesite['name'].encode() not in self.handler.list( self.handler.namesite['site']): self.handler.cacheuser(self.handler.namesite) rule = data[sphinxlib.DECAF_255_SER_BYTES:] esk = self.handler.getkey() sk = pysodium.crypto_sign_sk_to_box_sk(esk) epk = pysodium.crypto_sign_sk_to_pk(esk) pk = pysodium.crypto_sign_pk_to_box_pk(epk) rule = pysodium.crypto_box_seal_open(rule, pk, sk) if len(rule) != 42: raise ValueError('fail') rk = pysodium.crypto_generichash(self.handler.getkey(), self.handler.getsalt()) rule = pysodium.crypto_secretbox_open(rule[24:], rule[:24], rk) rule = struct.unpack(">H", rule)[0] size = (rule & 0x7f) rule = { c for i, c in enumerate(('u', 'l', 's', 'd')) if (rule >> 7) & (1 << i) } self.cb(bin2pass.derive(rwd, rule, size).decode())
def test_box_seal(): #p1 = b'~\x8b8\xf0%\xef\xba\x86\xe6\xcd\xd8\x16\x8b,\xf7\xa9\xc7a@F\x08\x84sx6\x1c\x18\xf5\x03\xbd"\x05' #s1 = b'\xe1\xa2\xfd\xc0\xbb\xe9\x1f,\x8a\xe8)D\x1dII\xe0\x9e{\xf1\xbe0\x04\x04\x8c\xde9V\x97\x9f\xe5&\x1a' pk_s = '7e8b38f025efba86e6cdd8168b2cf7a9c761404608847378361c18f503bd2205' sk_s = 'e1a2fdc0bbe91f2c8ae829441d4949e09e7bf1be3004048cde3956979fe5261a' # string to bytes (hexadecimal ) pk_h = bytes(pk_s, 'utf8') sk_h = bytes(sk_s, 'utf8') # hexadecimal to binary data pk_b = binascii.unhexlify(pk_h) sk_b = binascii.unhexlify(sk_h) x_s = '1f4fa3ccb8d877a7c8a26d4c86c6866eba50c8ad03567ac7e6f84cff3069e97e7576bc506c55de41501419fd49dadd13755b426b018d' x_b = bytes(x_s, 'utf8') s = binascii.unhexlify(x_b) print(pysodium.crypto_box_seal_open(s, pk_b, sk_b))
def data_received(self, data): res = b'' if verbose: print('Data received: {!r}'.format(data)) esk, xsk, xpk = getkey(keydir) data = pysodium.crypto_box_seal_open(data, xpk, xsk) clearmem(xsk) if data[64] == 0: res = self.create(data) elif data[64] == GET: # needs id, challenge, sig(id) # returns output from ./response | fail res = self.get(data) elif data[64] == CHANGE: # needs id, challenge, sig(id) # changes stored secret # returns output from ./response | fail res = self.change(data) elif data[64] == DELETE: # needs id, sig(id) # returns ok|fail res = self.delete(data) elif data[64] == COMMIT: # needs id, sig(id) # returns ok|fail res = self.commit(data) if verbose: print('Send: {!r}'.format(res)) res = pysodium.crypto_sign(res, esk) clearmem(esk) self.transport.write(res) if verbose: print('Close the client socket') self.transport.close()
def auth_decrypt_message(enc_message: bytes, my_verkey: bytes, my_sigkey: bytes) -> (bytes, str): """ Apply auth_decrypt to a binary message. Args: enc_message: The encrypted message secret: Secret for signing keys Returns: A tuple of (decrypted message, sender verkey) """ pk = pysodium.crypto_sign_pk_to_box_pk(my_verkey) sk = pysodium.crypto_sign_sk_to_box_sk(my_sigkey) body = pysodium.crypto_box_seal_open(enc_message, pk, sk) unpacked = msgpack.unpackb(body, raw=False) sender_vk = unpacked["sender"] nonce = b64_to_bytes(unpacked["nonce"]) enc_message = b64_to_bytes(unpacked["msg"]) sender_pk = pysodium.crypto_sign_pk_to_box_pk(b58_to_bytes(sender_vk)) message = pysodium.crypto_box_open(enc_message, nonce, sender_pk, sk) return message, sender_vk
def test_crypto_box_seal(self): pk, sk = pysodium.crypto_box_keypair() c = pysodium.crypto_box_seal(b"howdy", pk) self.assertEqual(pysodium.crypto_box_seal_open(c, pk, sk), b'howdy')
def test_crypto_box_seal(self): if not pysodium.sodium_version_check(1, 0, 3): return pk, sk = pysodium.crypto_box_keypair() c = pysodium.crypto_box_seal(b"howdy", pk) self.assertEqual(pysodium.crypto_box_seal_open(c, pk, sk), b'howdy')
def test_pysodium(): """ Test all the functions needed from pysodium libarary (libsodium) """ # crypto_sign signatures with Ed25519 keys # create keypair without seed verkey, sigkey = pysodium.crypto_sign_keypair() assert len(verkey) == 32 == pysodium.crypto_sign_PUBLICKEYBYTES assert len(sigkey) == 64 == pysodium.crypto_sign_SECRETKEYBYTES assert 32 == pysodium.crypto_sign_SEEDBYTES sigseed = pysodium.randombytes(pysodium.crypto_sign_SEEDBYTES) assert len(sigseed) == 32 # seed = (b'J\xeb\x06\xf2BA\xd6/T\xe1\xe2\xe2\x838\x8a\x99L\xd9\xb5(\\I\xccRb\xc8\xd5\xc7Y\x1b\xb6\xf0') # Ann's seed sigseed = ( b'PTi\x15\xd5\xd3`\xf1u\x15}^r\x9bfH\x02l\xc6\x1b\x1d\x1c\x0b9\xd7{\xc0_\xf2K\x93`' ) assert len(sigseed) == 32 # try key stretching from 16 bytes using pysodium.crypto_pwhash() assert 16 == pysodium.crypto_pwhash_SALTBYTES salt = pysodium.randombytes(pysodium.crypto_pwhash_SALTBYTES) assert len(salt) == 16 # salt = b'\x19?\xfa\xc7\x8f\x8b\x7f\x8b\xdbS"$\xd7[\x85\x87' # algorithm default is argon2id sigseed = pysodium.crypto_pwhash( outlen=32, passwd="", salt=salt, opslimit=pysodium.crypto_pwhash_OPSLIMIT_INTERACTIVE, memlimit=pysodium.crypto_pwhash_MEMLIMIT_INTERACTIVE, alg=pysodium.crypto_pwhash_ALG_DEFAULT) assert len(sigseed) == 32 # seed = (b'\xa9p\x89\x7f+\x0e\xc4\x9c\xf2\x01r\xafTI\xc0\xfa\xac\xd5\x99\xf8O\x8f=\x843\xa2\xb6e\x9fO\xff\xd0') # creates signing/verification key pair from seed verkey, sigkey = pysodium.crypto_sign_seed_keypair(sigseed) assert len(verkey) == 32 assert len(sigkey) == 64 # sigkey is seed and verkey concatenated. Libsodium does this as an optimization # because the signing scheme needs both the private key (seed) and the public key so # instead of recomputing the public key each time from the secret key it requires # the public key as an input of and instead of two separate inputs, one for the # secret key and one for the public key, it uses a concatenated form. # Essentially crypto_sign_seed_keypair and crypto_sign_keypair return redundant # information in the duple (verkey, sigkey) because sigkey includes verkey # so one could just store sigkey and extract verkey or sigseed when needed # or one could just store verkey and sigseed and reconstruct sigkey when needed. # crypto_sign_detached requires sigkey (sigseed + verkey) # crypto_sign_verify_detached reqires verkey only # https://crypto.stackexchange.com/questions/54353/why-are-nacl-secret-keys-64-bytes-for-signing-but-32-bytes-for-box assert sigseed == sigkey[:32] assert verkey == sigkey[32:] assert sigkey == sigseed + verkey # vk = (b'B\xdd\xbb}8V\xa0\xd6lk\xcf\x15\xad9\x1e\xa7\xa1\xfe\xe0p<\xb6\xbex\xb0s\x8d\xd6\xf5\xa5\xe8Q') # utility function to extract seed from secret sigkey (really just extracting from front half) assert sigseed == pysodium.crypto_sign_sk_to_seed(sigkey) assert 64 == pysodium.crypto_sign_BYTES msg = "The lazy dog jumped over the river" msgb = msg.encode( "utf-8") # must convert unicode string to bytes in order to sign it assert msgb == b'The lazy dog jumped over the river' sig = pysodium.crypto_sign_detached(msgb, sigseed + verkey) # sigkey = seed + verkey assert len(sig) == 64 """ sig = (b"\x99\xd2<9$$0\x9fk\xfb\x18\xa0\x8c@r\x122.k\xb2\xc7\x1fp\x0e'm\x8f@" b'\xaa\xa5\x8c\xc8n\x85\xc8!\xf6q\x91p\xa9\xec\xcf\x92\xaf)\xde\xca' b'\xfc\x7f~\xd7o|\x17\x82\x1d\xd4<o"\x81&\t') """ #siga = pysodium.crypto_sign(msg.encode("utf-8"), sk)[:pysodium.crypto_sign_BYTES] #assert len(siga) == 64 #assert sig == siga try: # verify returns None if valid else raises ValueError result = pysodium.crypto_sign_verify_detached(sig, msgb, verkey) except Exception as ex: assert False assert not result assert result is None sigbad = sig[:-1] sigbad += b'A' try: # verify returns None if valid else raises ValueError result = pysodium.crypto_sign_verify_detached(sigbad, msgb, verkey) except Exception as ex: assert True assert isinstance(ex, ValueError) # crypto_box authentication encryption with X25519 keys apubkey, aprikey = pysodium.crypto_box_keypair() assert len(apubkey) == 32 == pysodium.crypto_box_SECRETKEYBYTES assert len(aprikey) == 32 == pysodium.crypto_box_PUBLICKEYBYTES repubkey = pysodium.crypto_scalarmult_curve25519_base(aprikey) assert repubkey == apubkey assert 32 == pysodium.crypto_box_SEEDBYTES boxseed = pysodium.randombytes(pysodium.crypto_box_SEEDBYTES) assert len(boxseed) == 32 bpubkey, bprikey = pysodium.crypto_box_seed_keypair(boxseed) assert len(bpubkey) == 32 assert len(bprikey) == 32 repubkey = pysodium.crypto_scalarmult_curve25519_base(bprikey) assert repubkey == bpubkey assert 24 == pysodium.crypto_box_NONCEBYTES nonce = pysodium.randombytes(pysodium.crypto_box_NONCEBYTES) assert len(nonce) == 24 # nonce = b'\x11\xfbi<\xf2\xb6k\xa05\x0c\xf9\x86t\x07\x8e\xab\x8a\x97nG\xe8\x87,\x94' atob_tx = "Hi Bob I'm Alice" atob_txb = atob_tx.encode("utf-8") # Detached recomputes shared key every time. # A encrypt to B acrypt, amac = pysodium.crypto_box_detached(atob_txb, nonce, bpubkey, aprikey) amacl = pysodium.crypto_box_MACBYTES assert amacl == 16 # amac = b'\xa1]\xc6ML\xe2\xa9:\xc0\xdc\xab\xa5\xc4\xc7\xf4\xdb' # acrypt = (b'D\n\x17\xb6z\xd8+t)\xcc`y\x1d\x10\x0cTC\x02\xb5@\xe2\xf2\xc9-(\xec*O\xb8~\xe2\x1a\xebO') # when transmitting prepend amac to crypt acipher = pysodium.crypto_box(atob_txb, nonce, bpubkey, aprikey) assert acipher == amac + acrypt atob_rxb = pysodium.crypto_box_open_detached(acrypt, amac, nonce, apubkey, bprikey) atob_rx = atob_rxb.decode("utf-8") assert atob_rx == atob_tx assert atob_rxb == atob_txb atob_rxb = pysodium.crypto_box_open(acipher, nonce, apubkey, bprikey) atob_rx = atob_rxb.decode("utf-8") assert atob_rx == atob_tx assert atob_rxb == atob_txb btoa_tx = "Hello Alice I am Bob" btoa_txb = btoa_tx.encode("utf-8") # B encrypt to A bcrypt, bmac = pysodium.crypto_box_detached(btoa_txb, nonce, apubkey, bprikey) # bmac = b'\x90\xe07=\xd22\x8fh2\xff\xdd\x84tC\x053' # bcrypt = (b'8\xb5\xba\xe7\xcc\xae B\xefx\xe6{U\xf7\xefA\x00\xc7|\xdbu\xcfc\x01$\xa9\xa2P\xa7\x84\xa5\xae\x180') # when transmitting prepend amac to crypt bcipher = pysodium.crypto_box(btoa_txb, nonce, apubkey, bprikey) assert bcipher == bmac + bcrypt btoa_rxb = pysodium.crypto_box_open_detached(bcrypt, bmac, nonce, bpubkey, aprikey) btoa_rx = btoa_rxb.decode("utf-8") assert btoa_rx == btoa_tx assert btoa_rxb == btoa_txb btoa_rxb = pysodium.crypto_box_open(bcipher, nonce, bpubkey, aprikey) btoa_rx = btoa_rxb.decode("utf-8") assert btoa_rx == btoa_tx assert btoa_rxb == btoa_txb # compute shared key asymkey = pysodium.crypto_box_beforenm(bpubkey, aprikey) bsymkey = pysodium.crypto_box_beforenm(apubkey, bprikey) assert asymkey == bsymkey acipher = pysodium.crypto_box_afternm(atob_txb, nonce, asymkey) atob_rxb = pysodium.crypto_box_open_afternm(acipher, nonce, bsymkey) assert atob_rxb == atob_txb bcipher = pysodium.crypto_box_afternm(btoa_txb, nonce, bsymkey) btoa_rxb = pysodium.crypto_box_open_afternm(bcipher, nonce, asymkey) assert btoa_rxb == btoa_txb # crypto_box_seal public key encryption with X25519 keys # uses same X25519 type of keys as crypto_box authenticated encryption # so when converting sign key Ed25519 to X25519 can use for both types of encryption pubkey, prikey = pysodium.crypto_box_keypair() assert len(pubkey) == 32 == pysodium.crypto_box_PUBLICKEYBYTES assert len(prikey) == 32 == pysodium.crypto_box_SECRETKEYBYTES assert 48 == pysodium.crypto_box_SEALBYTES msg_txb = "Catch me if you can.".encode("utf-8") assert msg_txb == b'Catch me if you can.' cipher = pysodium.crypto_box_seal(msg_txb, pubkey) assert len(cipher) == 48 + len(msg_txb) msg_rxb = pysodium.crypto_box_seal_open(cipher, pubkey, prikey) assert msg_rxb == msg_txb # convert Ed25519 key pair to X25519 key pair # https://blog.filippo.io/using-ed25519-keys-for-encryption/ # https://libsodium.gitbook.io/doc/advanced/ed25519-curve25519 # crypto_sign_ed25519_pk_to_curve25519 # crypto_sign_ed25519_sk_to_curve25519 pubkey = pysodium.crypto_sign_pk_to_box_pk(verkey) assert len(pubkey) == pysodium.crypto_box_PUBLICKEYBYTES prikey = pysodium.crypto_sign_sk_to_box_sk(sigkey) assert len(prikey) == pysodium.crypto_box_SECRETKEYBYTES repubkey = pysodium.crypto_scalarmult_curve25519_base(prikey) assert repubkey == pubkey msg_txb = "Encoded using X25519 key converted from Ed25519 key".encode( "utf-8") cipher = pysodium.crypto_box_seal(msg_txb, pubkey) assert len(cipher) == 48 + len(msg_txb) msg_rxb = pysodium.crypto_box_seal_open(cipher, pubkey, prikey) assert msg_rxb == msg_txb """
def decrypt_msg(msg): team_pk, team_sk = team['crypt_pk'], TeamSecrets['crypt_sk'] # TODO Check if that's the better approach # reference: https://download.libsodium.org/doc/public-key_cryptography/sealed_boxes.html return pysodium.crypto_box_seal_open(msg, team_pk, team_sk)