def test_public_derivation(self):
# Construct from extended private key
bip32_ctx = Bip32.FromExtendedKey(TEST_PUBLIC_DER_MAIN["ex_priv"])
# Shall not be public
self.assertFalse(bip32_ctx.IsPublicOnly())
# Convert to public
bip32_ctx.ConvertToPublic()
# Shall be public and the public key shall be correct
self.assertTrue(bip32_ctx.IsPublicOnly())
self.assertEqual(TEST_PUBLIC_DER_MAIN["ex_pub"],
bip32_ctx.PublicKey().ToExtended())
# Getting the private key shall raise an exception
self.assertRaises(Bip32KeyError, bip32_ctx.PrivateKey)
self.assertRaises(Bip32KeyError, bip32_ctx.EcdsaPrivateKey)
# Test derivation paths
for test in TEST_PUBLIC_DER_MAIN["der_paths"]:
# Public derivation does not support hardened indexes
if Bip32Utils.IsHardenedIndex(test["index"]):
self.assertRaises(Bip32KeyError, bip32_ctx.ChildKey,
test["index"])
else:
bip32_ctx = bip32_ctx.ChildKey(test["index"])
self.assertEqual(test["ex_pub"],
bip32_ctx.PublicKey().ToExtended())
def generate_uuid(mnemonic, passphrase=""):
# At this point the Cobo Vault hardware is directly using the (secret)
# BIP39 mnemonic, converting it to a BIP39 seed value. If one is using a
# Shamir (SLIP39) mnemonic a different path is taken to generate these
# seed bytes.
seed_bytes = Bip39SeedGenerator(mnemonic).Generate(passphrase)
# From this point onwards the code is identical whether a BIP39 or SLIP39
# mnemonic. The following extracts the BIP32 Root Key. This is still secret
# data that we don't want leaking from the Cobo Vault hardware.
bip32_root = Bip32.FromSeed(seed_bytes)
# Given the BIP32 root key, derive a BIP32 extended (public/private) keypair,
# using Cobo's BIP32 derivation path. Note that this path is only used for
# generating the 'UUID' used by the Cobo Vault (and app). For coin-specific
# (e.g. Bitcoin etc.) keys the Cobo Vault hardware and App use more typical
# hardened paths that are commonly used - E.g. m/49'/0'/0' for bitcoin,
# m/44'/60'/0' for Ethereum, etc. Still secret data here!
cobo_extend_key = (
bip32_root.ChildKey(Bip32Utils.HardenIndex(44))
.ChildKey(Bip32Utils.HardenIndex(1131373167))
.ChildKey(Bip32Utils.HardenIndex(0))
)
# Up until this point the Cobo Vault hardware has been dealing with secret
# information that should never be leaked outside the device, as doing so
# would allow stealing of one's keys and thus cryptocurrency. The next step
# discards the private key information and extracts the public key only. The
# public key can be used to find all transactions associated with a wallet, but
# it *cannot* be used to spend (or steal) cryptocurrency.
public_key = cobo_extend_key.PublicKey().RawCompressed().ToHex()
# After discarding the private (secret) key, compress the public key and remove
# a couple bytes to produce the 'uuid'.
uuid = public_key[2:]
return uuid
def __test_public_derivation_ex_key(ut_class, bip32_ctx, test_vector):
# Shall be public and the public key shall be correct
ut_class.assertTrue(bip32_ctx.IsPublicOnly())
ut_class.assertEqual(test_vector["ex_pub"],
bip32_ctx.PublicKey().ToExtended())
# Getting the private key shall raise an exception
ut_class.assertRaises(Bip32KeyError, bip32_ctx.PrivateKey)
# Test derivation paths
for test in test_vector["der_paths"]:
# Public derivation does not support hardened indexes
if Bip32Utils.IsHardenedIndex(test["index"]):
ut_class.assertRaises(Bip32KeyError, bip32_ctx.ChildKey,
test["index"])
else:
bip32_ctx = bip32_ctx.ChildKey(test["index"])
ut_class.assertEqual(test["ex_pub"],
bip32_ctx.PublicKey().ToExtended())
def __test_path(self, test, path):
# Check length
self.assertEqual(len(test["parsed"]), path.Length())
# Check string conversion
self.assertEqual(test["to_str"], path.ToStr())
self.assertEqual(test["to_str"], str(path))
# Check by iterating
for idx, elem in enumerate(path):
test_elem = test["parsed"][idx]
self.assertEqual(test_elem, int(elem))
self.assertEqual(test_elem, int(path[idx]))
self.assertEqual(test_elem, elem.ToInt())
self.assertEqual(Bip32Utils.IsHardenedIndex(test_elem),
elem.IsHardened())
# Check by converting to list
for idx, elem in enumerate(path.ToList()):
self.assertEqual(test["parsed"][idx], elem)
# Tests from BIP32 page
TEST_VECT_BIP32 = \
[
{
"seed" : b"000102030405060708090a0b0c0d0e0f",
"master" :
{
"ex_pub" : "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
"ex_priv" : "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
},
"der_paths" :
[
# m/0'
{
"path" : "m/0'",
"index" : Bip32Utils.HardenIndex(0),
"ex_pub" : "xpub68Gmy5EdvgibQVfPdqkBBCHxA5htiqg55crXYuXoQRKfDBFA1WEjWgP6LHhwBZeNK1VTsfTFUHCdrfp1bgwQ9xv5ski8PX9rL2dZXvgGDnw",
"ex_priv" : "xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7",
},
# m/0'/1
{
"path" : "m/0'/1",
"index" : 1,
"ex_pub" : "xpub6ASuArnXKPbfEwhqN6e3mwBcDTgzisQN1wXN9BJcM47sSikHjJf3UFHKkNAWbWMiGj7Wf5uMash7SyYq527Hqck2AxYysAA7xmALppuCkwQ",
"ex_priv" : "xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs",
},
# m/0'/1/2'
{
"path" : "m/0'/1/2'",
"index" : Bip32Utils.HardenIndex(2),
"ex_pub" : "xpub6D4BDPcP2GT577Vvch3R8wDkScZWzQzMMUm3PWbmWvVJrZwQY4VUNgqFJPMM3No2dFDFGTsxxpG5uJh7n7epu4trkrX7x7DogT5Uv6fcLW5",
"xpub661MyMwAqRbcFybaNRzmKwjLEeQdU4ciWTZ1zPxvvN683xNT57Gr2k7YbdqBz5N5NdqeCEhiZLvSmZE721EUipgYL2v1QEGunyEs8JviJ6x",
"ex_priv":
"xprv9s21ZrQH143K3VX7GQTkxonbgca94bts9EdRC1ZKN2Z9BA3JXZxbUwo4kS28ECmXhK1NicjQ7yBwWbZXgjRVktP6Tzi4YqetK5ueSA2CaXP",
"pub_key":
"00835e3307bf32df124bc0bd3e3d5eb4a751ceeebe06b69fbce54fef97bc37c062",
"priv_key":
"2b4be7f19ee27bbf30c667b642d5f4aa69fd169872f8fc3059c08ebae2eb19e7",
"chain_code":
"90046a93de5380a72b5e45010748567d5ea02bbf6522f979e05c0d8d8ca9fffb",
"parent_fprint": "00000000",
},
"der_paths": [
# m/0'
{
"path": "m/0'",
"index": Bip32Utils.HardenIndex(0),
"ex_pub":
"xpub69F72R5LsVNeZxu7hYqxueqXRsieg29CFBMAd5rr1YuAK4CCuG3wc7dT2pucqZppRkHRDGoRyvQNHLnSVPYQ8Eph974t7ok1k17Q56yv79x",
"ex_priv":
"xprv9vFkcuYT37pMMUpebXJxYWtnsqtAGZRLsxRZphTETDNBSFs4Mijh4KJyBcsGNuNDY4SsYz8pwQ4L9ob2Qw2gviLdtQPAwG3t4Wf8Lb4rrXX",
"pub_key":
"00df1f51aae49a3c17d07f603ded31c409e4c81fa8b32425a7e0de4143d3cfbeac",
"priv_key":
"68e0fe46dfb67e368c75379acec591dad19df3cde26e63b93a8e704f1dade7a3",
"chain_code":
"8b59aa11380b624e81507a27fedda59fea6d0b779a778918a2fd3590e16e9c69",
"parent_fprint": "b8637b7e",
},
# m/0'/1'
{
"path": "m/0'/1'",
},
{
"path": "m/ 0/1",
"parsed": [0, 1],
"is_absolute": True,
"to_str": "m/0/1",
},
{
"path": "m/// 0//1",
"parsed": [0, 1],
"is_absolute": True,
"to_str": "m/0/1",
},
{
"path": "m/0 /1'",
"parsed": [0, Bip32Utils.HardenIndex(1)],
"is_absolute": True,
"to_str": "m/0/1'",
},
{
"path": "m/0 /1p",
"parsed": [0, Bip32Utils.HardenIndex(1)],
"is_absolute": True,
"to_str": "m/0/1'",
},
{
"path": "m/0'/1'/2/",
"parsed": [Bip32Utils.HardenIndex(0),
Bip32Utils.HardenIndex(1), 2],
"is_absolute": True,
"to_str": "m/0'/1'/2",