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update bip32 derivations, using xpriv and xpub serialization format

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This commit is contained in:
ThomasV
2014-03-31 12:12:29 +02:00
parent 328432f5f4
commit 91ba04c4d7
1 changed files with 18 additions and 31 deletions
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49
lib/bitcoin.py
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@@ -577,20 +577,22 @@ def CKD_pub(cK, c, n):
return cK_n, c_n
def parse_xprv(xprv):
xprv = DecodeBase58Check( xprv )
assert len(xprv) == 78
assert xprv[0:4] == "0488ADE4".decode('hex')
depth = ord(xprv[4])
fingerprint = xprv[5:9]
child_number = xprv[9:13]
c = xprv[13:13+32]
k = xprv[13+33:]
K, cK = get_pubkeys_from_secret(k)
key_id = hash_160(cK)
print "keyid", key_id.encode('hex')
print "address", hash_160_to_bc_address(key_id)
print "secret key", SecretToASecret(k, True)
def deserialize_xkey(xkey):
xkey = DecodeBase58Check(xkey)
assert len(xkey) == 78
assert xkey[0:4].encode('hex') in ["0488ADE4", "0488B21E"]
assert sequence.startswith(branch)
depth = ord(xkey[4])
fingerprint = xkey[5:9]
child_number = xkey[9:13]
c = xkey[13:13+32]
if xkey[0:4].encode('hex') == "0488ADE4":
K_or_k = xkey[13+33:]
else:
K_or_k = xkey[13+32:]
return depth, fingerprint, child_number, c, K_or_k
def bip32_root(seed):
@@ -607,15 +609,8 @@ def bip32_root(seed):
def bip32_private_derivation(xprv, branch, sequence):
xprv = DecodeBase58Check( xprv )
assert len(xprv) == 78
assert xprv[0:4] == "0488ADE4".decode('hex')
depth, fingerprint, child_number, c, k = deserialize_xkey(xprv)
assert sequence.startswith(branch)
depth = ord(xprv[4])
fingerprint = xprv[5:9]
child_number = xprv[9:13]
c = xprv[13:13+32]
k = xprv[13+33:]
sequence = sequence[len(branch):]
for n in sequence.split('/'):
if n == '': continue
@@ -635,15 +630,8 @@ def bip32_private_derivation(xprv, branch, sequence):
def bip32_public_derivation(xpub, branch, sequence):
xpub = DecodeBase58Check( xpub )
assert len(xpub) == 78
assert xpub[0:4] == "0488B21E".decode('hex')
depth, fingerprint, child_number, c, cK = deserialize_xkey(xpub)
assert sequence.startswith(branch)
depth = ord(xpub[4])
fingerprint = xpub[5:9]
child_number = xpub[9:13]
c = xpub[13:13+32]
cK = xpub[13+32:]
sequence = sequence[len(branch):]
for n in sequence.split('/'):
if n == '': continue
@@ -683,7 +671,6 @@ def test_bip32(seed, sequence):
xprv, xpub = bip32_root(seed)
print xpub
print xprv
#parse_xprv(xprv)
assert sequence[0:2] == "m/"
path = 'm'