tupdate bip32 derivations, using xpriv and xpub serialization format - electrum - Electrum Bitcoin wallet
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---
DIR commit 91ba04c4d7a40454ae163b1f65c023771400a206
DIR parent 328432f5f45ea12a22037adff133cb253c678896
HTML Author: ThomasV <thomasv@gitorious>
Date: Mon, 31 Mar 2014 12:12:29 +0200
update bip32 derivations, using xpriv and xpub serialization format
Diffstat:
M lib/bitcoin.py | 49 ++++++++++++-------------------
1 file changed, 18 insertions(+), 31 deletions(-)
---
DIR diff --git a/lib/bitcoin.py b/lib/bitcoin.py
t@@ -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):
t@@ -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
t@@ -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
t@@ -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'