ZeroNet/src/lib/opensslVerify/opensslVerify.py

393 lines
12 KiB
Python

# Code is borrowed from https://github.com/blocktrail/python-bitcoinlib
# Thanks!
import base64, hashlib
import ctypes
import ctypes.util
_bchr = chr
_bord = ord
try:
_ssl = ctypes.CDLL("src/lib/opensslVerify/libeay32.dll")
except:
_ssl = ctypes.cdll.LoadLibrary(ctypes.util.find_library('ssl') or ctypes.util.find_library('crypto') or 'libeay32')
import sys
openssl_version = "%.9X" % _ssl.SSLeay()
# this specifies the curve used with ECDSA.
_NID_secp256k1 = 714 # from openssl/obj_mac.h
# Thx to Sam Devlin for the ctypes magic 64-bit fix.
def _check_result (val, func, args):
if val == 0:
raise ValueError
else:
return ctypes.c_void_p(val)
_ssl.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p
_ssl.EC_KEY_new_by_curve_name.errcheck = _check_result
# From openssl/ecdsa.h
class ECDSA_SIG_st(ctypes.Structure):
_fields_ = [("r", ctypes.c_void_p),
("s", ctypes.c_void_p)]
class CECKey:
"""Wrapper around OpenSSL's EC_KEY"""
POINT_CONVERSION_COMPRESSED = 2
POINT_CONVERSION_UNCOMPRESSED = 4
def __init__(self):
self.k = _ssl.EC_KEY_new_by_curve_name(_NID_secp256k1)
def __del__(self):
if _ssl:
_ssl.EC_KEY_free(self.k)
self.k = None
def set_secretbytes(self, secret):
priv_key = _ssl.BN_bin2bn(secret, 32, _ssl.BN_new())
group = _ssl.EC_KEY_get0_group(self.k)
pub_key = _ssl.EC_POINT_new(group)
ctx = _ssl.BN_CTX_new()
if not _ssl.EC_POINT_mul(group, pub_key, priv_key, None, None, ctx):
raise ValueError("Could not derive public key from the supplied secret.")
_ssl.EC_POINT_mul(group, pub_key, priv_key, None, None, ctx)
_ssl.EC_KEY_set_private_key(self.k, priv_key)
_ssl.EC_KEY_set_public_key(self.k, pub_key)
_ssl.EC_POINT_free(pub_key)
_ssl.BN_CTX_free(ctx)
return self.k
def set_privkey(self, key):
self.mb = ctypes.create_string_buffer(key)
return _ssl.d2i_ECPrivateKey(ctypes.byref(self.k), ctypes.byref(ctypes.pointer(self.mb)), len(key))
def set_pubkey(self, key):
self.mb = ctypes.create_string_buffer(key)
return _ssl.o2i_ECPublicKey(ctypes.byref(self.k), ctypes.byref(ctypes.pointer(self.mb)), len(key))
def get_privkey(self):
size = _ssl.i2d_ECPrivateKey(self.k, 0)
mb_pri = ctypes.create_string_buffer(size)
_ssl.i2d_ECPrivateKey(self.k, ctypes.byref(ctypes.pointer(mb_pri)))
return mb_pri.raw
def get_pubkey(self):
size = _ssl.i2o_ECPublicKey(self.k, 0)
mb = ctypes.create_string_buffer(size)
_ssl.i2o_ECPublicKey(self.k, ctypes.byref(ctypes.pointer(mb)))
return mb.raw
def get_raw_ecdh_key(self, other_pubkey):
ecdh_keybuffer = ctypes.create_string_buffer(32)
r = _ssl.ECDH_compute_key(ctypes.pointer(ecdh_keybuffer), 32,
_ssl.EC_KEY_get0_public_key(other_pubkey.k),
self.k, 0)
if r != 32:
raise Exception('CKey.get_ecdh_key(): ECDH_compute_key() failed')
return ecdh_keybuffer.raw
def get_ecdh_key(self, other_pubkey, kdf=lambda k: hashlib.sha256(k).digest()):
# FIXME: be warned it's not clear what the kdf should be as a default
r = self.get_raw_ecdh_key(other_pubkey)
return kdf(r)
def sign(self, hash):
if not isinstance(hash, bytes):
raise TypeError('Hash must be bytes instance; got %r' % hash.__class__)
if len(hash) != 32:
raise ValueError('Hash must be exactly 32 bytes long')
sig_size0 = ctypes.c_uint32()
sig_size0.value = _ssl.ECDSA_size(self.k)
mb_sig = ctypes.create_string_buffer(sig_size0.value)
result = _ssl.ECDSA_sign(0, hash, len(hash), mb_sig, ctypes.byref(sig_size0), self.k)
assert 1 == result
if bitcoin.core.script.IsLowDERSignature(mb_sig.raw[:sig_size0.value]):
return mb_sig.raw[:sig_size0.value]
else:
return self.signature_to_low_s(mb_sig.raw[:sig_size0.value])
def sign_compact(self, hash):
if not isinstance(hash, bytes):
raise TypeError('Hash must be bytes instance; got %r' % hash.__class__)
if len(hash) != 32:
raise ValueError('Hash must be exactly 32 bytes long')
sig_size0 = ctypes.c_uint32()
sig_size0.value = _ssl.ECDSA_size(self.k)
mb_sig = ctypes.create_string_buffer(sig_size0.value)
result = _ssl.ECDSA_sign(0, hash, len(hash), mb_sig, ctypes.byref(sig_size0), self.k)
assert 1 == result
if bitcoin.core.script.IsLowDERSignature(mb_sig.raw[:sig_size0.value]):
sig = mb_sig.raw[:sig_size0.value]
else:
sig = self.signature_to_low_s(mb_sig.raw[:sig_size0.value])
sig = bitcoin.core.DERSignature.deserialize(sig)
r_val = sig.r
s_val = sig.s
# assert that the r and s are less than 32 long, excluding leading 0s
assert len(r_val) <= 32 or r_val[0:-32] == b'\x00'
assert len(s_val) <= 32 or s_val[0:-32] == b'\x00'
# ensure r and s are always 32 chars long by 0padding
r_val = ((b'\x00' * 32) + r_val)[-32:]
s_val = ((b'\x00' * 32) + s_val)[-32:]
# tmp pubkey of self, but always compressed
pubkey = CECKey()
pubkey.set_pubkey(self.get_pubkey())
pubkey.set_compressed(True)
# bitcoin core does <4, but I've seen other places do <2 and I've never seen a i > 1 so far
for i in range(0, 4):
cec_key = CECKey()
cec_key.set_compressed(True)
result = cec_key.recover(r_val, s_val, hash, len(hash), i, 1)
if result == 1:
if cec_key.get_pubkey() == pubkey.get_pubkey():
return r_val + s_val, i
raise ValueError
def signature_to_low_s(self, sig):
der_sig = ECDSA_SIG_st()
_ssl.d2i_ECDSA_SIG(ctypes.byref(ctypes.pointer(der_sig)), ctypes.byref(ctypes.c_char_p(sig)), len(sig))
group = _ssl.EC_KEY_get0_group(self.k)
order = _ssl.BN_new()
halforder = _ssl.BN_new()
ctx = _ssl.BN_CTX_new()
_ssl.EC_GROUP_get_order(group, order, ctx)
_ssl.BN_rshift1(halforder, order)
# Verify that s is over half the order of the curve before we actually subtract anything from it
if _ssl.BN_cmp(der_sig.s, halforder) > 0:
_ssl.BN_sub(der_sig.s, order, der_sig.s)
_ssl.BN_free(halforder)
_ssl.BN_free(order)
_ssl.BN_CTX_free(ctx)
derlen = _ssl.i2d_ECDSA_SIG(ctypes.pointer(der_sig), 0)
if derlen == 0:
_ssl.ECDSA_SIG_free(der_sig)
return None
new_sig = ctypes.create_string_buffer(derlen)
_ssl.i2d_ECDSA_SIG(ctypes.pointer(der_sig), ctypes.byref(ctypes.pointer(new_sig)))
_ssl.BN_free(der_sig.r)
_ssl.BN_free(der_sig.s)
return new_sig.raw
def verify(self, hash, sig):
"""Verify a DER signature"""
if not sig:
return false
# New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
norm_sig = ctypes.c_void_p(0)
_ssl.d2i_ECDSA_SIG(ctypes.byref(norm_sig), ctypes.byref(ctypes.c_char_p(sig)), len(sig))
derlen = _ssl.i2d_ECDSA_SIG(norm_sig, 0)
if derlen == 0:
_ssl.ECDSA_SIG_free(norm_sig)
return false
norm_der = ctypes.create_string_buffer(derlen)
_ssl.i2d_ECDSA_SIG(norm_sig, ctypes.byref(ctypes.pointer(norm_der)))
_ssl.ECDSA_SIG_free(norm_sig)
# -1 = error, 0 = bad sig, 1 = good
return _ssl.ECDSA_verify(0, hash, len(hash), norm_der, derlen, self.k) == 1
def set_compressed(self, compressed):
if compressed:
form = self.POINT_CONVERSION_COMPRESSED
else:
form = self.POINT_CONVERSION_UNCOMPRESSED
_ssl.EC_KEY_set_conv_form(self.k, form)
def recover(self, sigR, sigS, msg, msglen, recid, check):
"""
Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
recid selects which key is recovered
if check is non-zero, additional checks are performed
"""
i = int(recid / 2)
r = None
s = None
ctx = None
R = None
O = None
Q = None
assert len(sigR) == 32, len(sigR)
assert len(sigS) == 32, len(sigS)
try:
r = _ssl.BN_bin2bn(bytes(sigR), len(sigR), _ssl.BN_new())
s = _ssl.BN_bin2bn(bytes(sigS), len(sigS), _ssl.BN_new())
group = _ssl.EC_KEY_get0_group(self.k)
ctx = _ssl.BN_CTX_new()
order = _ssl.BN_CTX_get(ctx)
ctx = _ssl.BN_CTX_new()
if not _ssl.EC_GROUP_get_order(group, order, ctx):
return -2
x = _ssl.BN_CTX_get(ctx)
if not _ssl.BN_copy(x, order):
return -1
if not _ssl.BN_mul_word(x, i):
return -1
if not _ssl.BN_add(x, x, r):
return -1
field = _ssl.BN_CTX_get(ctx)
if not _ssl.EC_GROUP_get_curve_GFp(group, field, None, None, ctx):
return -2
if _ssl.BN_cmp(x, field) >= 0:
return 0
R = _ssl.EC_POINT_new(group)
if R is None:
return -2
if not _ssl.EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx):
return 0
if check:
O = _ssl.EC_POINT_new(group)
if O is None:
return -2
if not _ssl.EC_POINT_mul(group, O, None, R, order, ctx):
return -2
if not _ssl.EC_POINT_is_at_infinity(group, O):
return 0
Q = _ssl.EC_POINT_new(group)
if Q is None:
return -2
n = _ssl.EC_GROUP_get_degree(group)
e = _ssl.BN_CTX_get(ctx)
if not _ssl.BN_bin2bn(msg, msglen, e):
return -1
if 8 * msglen > n:
_ssl.BN_rshift(e, e, 8 - (n & 7))
zero = _ssl.BN_CTX_get(ctx)
# if not _ssl.BN_zero(zero):
# return -1
if not _ssl.BN_mod_sub(e, zero, e, order, ctx):
return -1
rr = _ssl.BN_CTX_get(ctx)
if not _ssl.BN_mod_inverse(rr, r, order, ctx):
return -1
sor = _ssl.BN_CTX_get(ctx)
if not _ssl.BN_mod_mul(sor, s, rr, order, ctx):
return -1
eor = _ssl.BN_CTX_get(ctx)
if not _ssl.BN_mod_mul(eor, e, rr, order, ctx):
return -1
if not _ssl.EC_POINT_mul(group, Q, eor, R, sor, ctx):
return -2
if not _ssl.EC_KEY_set_public_key(self.k, Q):
return -2
return 1
finally:
if r: _ssl.BN_free(r)
if s: _ssl.BN_free(s)
if ctx: _ssl.BN_CTX_free(ctx)
if R: _ssl.EC_POINT_free(R)
if O: _ssl.EC_POINT_free(O)
if Q: _ssl.EC_POINT_free(Q)
def recover_compact(hash, sig):
"""Recover a public key from a compact signature."""
if len(sig) != 65:
raise ValueError("Signature should be 65 characters, not [%d]" % (len(sig), ))
recid = (_bord(sig[0]) - 27) & 3
compressed = (_bord(sig[0]) - 27) & 4 != 0
cec_key = CECKey()
cec_key.set_compressed(compressed)
sigR = sig[1:33]
sigS = sig[33:65]
result = cec_key.recover(sigR, sigS, hash, len(hash), recid, 0)
if result < 1:
return False
pubkey = cec_key.get_pubkey()
return pubkey
def encode(val, base, minlen=0):
base, minlen = int(base), int(minlen)
code_string = ''.join([chr(x) for x in range(256)])
result = ""
while val > 0:
result = code_string[val % base] + result
val //= base
return code_string[0] * max(minlen - len(result), 0) + result
def num_to_var_int(x):
x = int(x)
if x < 253: return chr(x)
elif x < 65536: return chr(253)+encode(x, 256, 2)[::-1]
elif x < 4294967296: return chr(254) + encode(x, 256, 4)[::-1]
else: return chr(255) + encode(x, 256, 8)[::-1]
def msg_magic(message):
return "\x18Bitcoin Signed Message:\n" + num_to_var_int( len(message) ) + message
def getMessagePubkey(message, sig):
message = msg_magic(message)
hash = hashlib.sha256(hashlib.sha256(message).digest()).digest()
sig = base64.b64decode(sig)
pubkey = recover_compact(hash, sig)
return pubkey
def test():
sign = "HGbib2kv9gm9IJjDt1FXbXFczZi35u0rZR3iPUIt5GglDDCeIQ7v8eYXVNIaLoJRI4URGZrhwmsYQ9aVtRTnTfQ="
pubkey = "044827c756561b8ef6b28b5e53a000805adbf4938ab82e1c2b7f7ea16a0d6face9a509a0a13e794d742210b00581f3e249ebcc705240af2540ea19591091ac1d41"
assert getMessagePubkey("hello", sign).encode("hex") == pubkey
test() # Make sure it working right
if __name__ == "__main__":
import time
from pybitcointools import bitcoin as btctools
priv = "5JsunC55XGVqFQj5kPGK4MWgTL26jKbnPhjnmchSNPo75XXCwtk"
address = "1N2XWu5soeppX2qUjvrf81rpdbShKJrjTr"
sign = btctools.ecdsa_sign("hello", priv) # HGbib2kv9gm9IJjDt1FXbXFczZi35u0rZR3iPUIt5GglDDCeIQ7v8eYXVNIaLoJRI4URGZrhwmsYQ9aVtRTnTfQ=
s = time.time()
for i in range(100):
pubkey = getMessagePubkey("hello", sign)
verified = btctools.pubkey_to_address(pubkey) == address
print "100x Verified", verified, time.time()-s