157 lines
7.4 KiB
Python
157 lines
7.4 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 .comm import getDongle
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from .ecWrapper import PrivateKey, PublicKey
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import hashlib
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import argparse
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import struct
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import os
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import binascii
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def auto_int(x):
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return int(x, 0)
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def getDeployedSecretV2(dongle, masterPrivate, targetid, issuerKey):
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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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dataToSign = bytes(bytearray([0x01]) + testMasterPublic)
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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(testMasterPublic)]) + testMasterPublic + 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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# 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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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(binascii.unhexlify(issuerKey), raw=True)
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device_pub_key = None
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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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return None
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last_pub_key = PublicKey(bytes(certificatePublicKey), raw=True)
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if index == 0:
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device_pub_key = last_pub_key
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index = index + 1
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return device_pub_key
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"--key", help="Reference of the endorsement key to setup (1 or 2)", type=auto_int)
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parser.add_argument(
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"--certificate", help="Optional certificate to store if finalizing the endorsement (hex encoded), if no private key is specified")
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parser.add_argument(
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"--privateKey", help="Optional private key to use to create a test certificate (hex encoded), if no certificate is specified")
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parser.add_argument("--targetId", help="Set the chip target ID", type=auto_int)
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parser.add_argument("--issuerKey", help="Issuer key (hex encoded, default : batch 1)")
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parser.add_argument("--apdu", help="Display APDU log", action='store_true')
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args = parser.parse_args()
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if args.key == None:
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raise Exception("Missing endorsement key reference")
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if args.key != 1 and args.key != 2:
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raise Exception("Invalid endorsement key reference")
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if args.targetId == None:
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args.targetId = 0x31000002
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if args.issuerKey == None:
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args.issuerKey = "0490f5c9d15a0134bb019d2afd0bf297149738459706e7ac5be4abc350a1f818057224fce12ec9a65de18ec34d6e8c24db927835ea1692b14c32e9836a75dad609"
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if (args.privateKey != None) and (args.certificate != None):
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raise Exception("Cannot specify both certificate and privateKey")
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privateKey = PrivateKey()
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publicKey = str(privateKey.pubkey.serialize(compressed=False))
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args.rootPrivateKey = privateKey.serialize()
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dongle = getDongle(args.apdu)
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publicKey = getDeployedSecretV2(dongle, bytearray.fromhex(args.rootPrivateKey), args.targetId, args.issuerKey)
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if args.certificate == None:
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apdu = bytearray([0xe0, 0xC0, args.key, 0x00, 0x00])
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response = dongle.exchange(apdu)
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print("Public key " + str(response[0:65]).encode('hex'))
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m = hashlib.sha256()
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m.update(bytes("\xff")) # Endorsement role
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m.update(bytes(response[0:65]))
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digest = m.digest()
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signature = publicKey.ecdsa_deserialize(bytes(response[65:]))
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if not publicKey.ecdsa_verify(bytes(digest), signature, raw=True):
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raise Exception("Issuer certificate not verified")
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if args.privateKey != None:
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privateKey = PrivateKey(bytes(args.privateKey.decode('hex')))
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dataToSign = bytes(bytearray([0xfe]) + response[0:65])
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signature = privateKey.ecdsa_sign(bytes(dataToSign))
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args.certificate = str(privateKey.ecdsa_serialize(signature)).encode('hex')
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if args.certificate != None:
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certificate = bytearray.fromhex(args.certificate)
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apdu = bytearray([0xe0, 0xC2, 0x00, 0x00, len(certificate)]) + certificate
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dongle.exchange(apdu)
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print("Endorsement setup finalized")
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