147 lines
6.0 KiB
Python
147 lines
6.0 KiB
Python
"""
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*******************************************************************************
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* Ledger Blue
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* (c) 2016 Ledger
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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********************************************************************************
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"""
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from secp256k1 import PrivateKey, PublicKey
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import os
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import sys
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import struct
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from .hexParser import IntelHexParser
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from .hexLoader import HexLoader
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def getDeployedSecretV1(dongle, masterPrivate, targetid):
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testMaster = PrivateKey(bytes(masterPrivate))
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testMasterPublic = bytearray(testMaster.pubkey.serialize(compressed=False))
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targetid = bytearray(struct.pack('>I', targetid))
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# identify
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apdu = bytearray([0xe0, 0x04, 0x00, 0x00]) + bytearray([len(targetid)]) + targetid
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dongle.exchange(apdu)
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# walk the chain
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batch_info = bytearray(dongle.exchange(bytearray.fromhex('E050000000')))
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cardKey = batch_info[5:5 + batch_info[4]]
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# if not found, get another pair
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#if cardKey <> testMasterPublic:
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# raise Exception("Invalid batch public key")
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# provide the ephemeral certificate
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ephemeralPrivate = PrivateKey()
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ephemeralPublic = bytearray(ephemeralPrivate.pubkey.serialize(compressed=False))
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print "Using ephemeral key " + str(ephemeralPublic).encode('hex')
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signature = testMaster.ecdsa_sign(bytes(ephemeralPublic))
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signature = testMaster.ecdsa_serialize(signature)
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certificate = bytearray([len(ephemeralPublic)]) + ephemeralPublic + bytearray([len(signature)]) + signature
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apdu = bytearray([0xE0, 0x51, 0x00, 0x00]) + bytearray([len(certificate)]) + certificate
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dongle.exchange(apdu)
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# walk the device certificates to retrieve the public key to use for authentication
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index = 0
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last_pub_key = PublicKey(bytes(testMasterPublic), raw=True)
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while True:
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certificate = bytearray(dongle.exchange(bytearray.fromhex('E052000000')))
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if len(certificate) == 0:
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break
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certificatePublic = certificate[1 : 1 + certificate[0]]
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certificateSignature = last_pub_key.ecdsa_deserialize(bytes(certificate[2 + certificate[0] :]))
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if not last_pub_key.ecdsa_verify(bytes(certificatePublic), certificateSignature):
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if index == 0:
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# Not an error if loading from user key
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print "Broken certificate chain - loading from user key"
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else:
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raise Exception("Broken certificate chain")
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last_pub_key = PublicKey(bytes(certificatePublic), raw=True)
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index = index + 1
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# Commit device ECDH channel
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dongle.exchange(bytearray.fromhex('E053000000'))
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secret = last_pub_key.ecdh(bytes(ephemeralPrivate.serialize().decode('hex')))
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return str(secret[0:16])
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def getDeployedSecretV2(dongle, masterPrivate, targetid):
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testMaster = PrivateKey(bytes(masterPrivate))
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testMasterPublic = bytearray(testMaster.pubkey.serialize(compressed=False))
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targetid = bytearray(struct.pack('>I', targetid))
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# identify
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apdu = bytearray([0xe0, 0x04, 0x00, 0x00]) + bytearray([len(targetid)]) + targetid
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dongle.exchange(apdu)
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# walk the chain
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nonce = os.urandom(8)
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apdu = bytearray([0xe0, 0x50, 0x00, 0x00]) + bytearray([len(nonce)]) + nonce
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auth_info = dongle.exchange(apdu)
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batch_signer_serial = auth_info[0:4]
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deviceNonce = auth_info[4:12]
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# if not found, get another pair
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#if cardKey <> testMasterPublic:
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# raise Exception("Invalid batch public key")
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# provide the ephemeral certificate
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ephemeralPrivate = PrivateKey()
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ephemeralPublic = bytearray(ephemeralPrivate.pubkey.serialize(compressed=False))
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print "Using ephemeral key " + str(ephemeralPublic).encode('hex')
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dataToSign = bytes(bytearray([0x11]) + nonce + deviceNonce + ephemeralPublic)
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signature = testMaster.ecdsa_sign(bytes(dataToSign))
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signature = testMaster.ecdsa_serialize(signature)
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certificate = bytearray([len(ephemeralPublic)]) + ephemeralPublic + bytearray([len(signature)]) + signature
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apdu = bytearray([0xE0, 0x51, 0x80, 0x00]) + bytearray([len(certificate)]) + certificate
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dongle.exchange(apdu)
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# walk the device certificates to retrieve the public key to use for authentication
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index = 0
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last_pub_key = PublicKey(bytes(testMasterPublic), raw=True)
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while True:
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if index == 0:
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certificate = bytearray(dongle.exchange(bytearray.fromhex('E052000000')))
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elif index == 1:
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certificate = bytearray(dongle.exchange(bytearray.fromhex('E052800000')))
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else:
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break
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if len(certificate) == 0:
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break
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offset = 1
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certificateHeader = certificate[offset : offset + certificate[offset-1]]
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offset += certificate[offset-1] + 1
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certificatePublicKey = certificate[offset : offset + certificate[offset-1]]
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offset += certificate[offset-1] + 1
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certificateSignatureArray = certificate[offset : offset + certificate[offset-1]]
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certificateSignature = last_pub_key.ecdsa_deserialize(bytes(certificateSignatureArray))
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# first cert contains a header field which holds the certificate's public key role
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if index == 0:
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certificateSignedData = bytearray([0x02]) + certificateHeader + certificatePublicKey
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# Could check if the device certificate is signed by the issuer public key
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# ephemeral key certificate
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else:
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certificateSignedData = bytearray([0x12]) + deviceNonce + nonce + certificatePublicKey
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if not last_pub_key.ecdsa_verify(bytes(certificateSignedData), certificateSignature):
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if index == 0:
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# Not an error if loading from user key
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print "Broken certificate chain - loading from user key"
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else:
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raise Exception("Broken certificate chain")
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last_pub_key = PublicKey(bytes(certificatePublicKey), raw=True)
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index = index + 1
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# Commit device ECDH channel
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dongle.exchange(bytearray.fromhex('E053000000'))
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secret = last_pub_key.ecdh(bytes(ephemeralPrivate.serialize().decode('hex')))
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return str(secret[0:16])
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