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Merge pull request #778 from Atheros1/pointMult-exception

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handle OpenSSL.EC_KEY_get0_group() exception
This commit is contained in:
Jonathan Warren 2015-02-06 16:34:41 -05:00
commit 0833938ea3
1 changed files with 32 additions and 16 deletions
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44
src/highlevelcrypto.py
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@ -40,20 +40,36 @@ def verify(msg,sig,hexPubkey):
# Does an EC point multiplication; turns a private key into a public key. # Does an EC point multiplication; turns a private key into a public key.
def pointMult(secret): def pointMult(secret):
k = OpenSSL.EC_KEY_new_by_curve_name(OpenSSL.get_curve('secp256k1')) while True:
priv_key = OpenSSL.BN_bin2bn(secret, 32, None) try:
group = OpenSSL.EC_KEY_get0_group(k) """
pub_key = OpenSSL.EC_POINT_new(group) Evidently, this type of error can occur very rarely:
OpenSSL.EC_POINT_mul(group, pub_key, priv_key, None, None, None) File "highlevelcrypto.py", line 54, in pointMult
OpenSSL.EC_KEY_set_private_key(k, priv_key) group = OpenSSL.EC_KEY_get0_group(k)
OpenSSL.EC_KEY_set_public_key(k, pub_key) WindowsError: exception: access violation reading 0x0000000000000008
"""
k = OpenSSL.EC_KEY_new_by_curve_name(OpenSSL.get_curve('secp256k1'))
priv_key = OpenSSL.BN_bin2bn(secret, 32, None)
group = OpenSSL.EC_KEY_get0_group(k)
pub_key = OpenSSL.EC_POINT_new(group)
size = OpenSSL.i2o_ECPublicKey(k, None) OpenSSL.EC_POINT_mul(group, pub_key, priv_key, None, None, None)
mb = OpenSSL.create_string_buffer(size) OpenSSL.EC_KEY_set_private_key(k, priv_key)
OpenSSL.i2o_ECPublicKey(k, OpenSSL.byref(OpenSSL.pointer(mb))) OpenSSL.EC_KEY_set_public_key(k, pub_key)
size = OpenSSL.i2o_ECPublicKey(k, None)
mb = OpenSSL.create_string_buffer(size)
OpenSSL.i2o_ECPublicKey(k, OpenSSL.byref(OpenSSL.pointer(mb)))
OpenSSL.EC_POINT_free(pub_key)
OpenSSL.BN_free(priv_key)
OpenSSL.EC_KEY_free(k)
return mb.raw
except Exception as e:
import traceback
import time
traceback.print_exc()
time.sleep(0.2)
OpenSSL.EC_POINT_free(pub_key)
OpenSSL.BN_free(priv_key)
OpenSSL.EC_KEY_free(k)
return mb.raw