cis-kuldeep/PyBitmessage-2021-04-27
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Merge pull request #697 from Atheros1/master

Browse Source 
support pyelliptic's updated HMAC algorithm
This commit is contained in:
Jonathan Warren 2014-07-29 13:56:29 -04:00
commit 833131f2c9
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/pyelliptic/ecc.py
View File

@ -437,8 +437,10 @@ class ECC:
iv = OpenSSL.rand(OpenSSL.get_cipher(ciphername).get_blocksize()) iv = OpenSSL.rand(OpenSSL.get_cipher(ciphername).get_blocksize())
ctx = Cipher(key_e, iv, 1, ciphername) ctx = Cipher(key_e, iv, 1, ciphername)
ciphertext = ctx.ciphering(data) ciphertext = ctx.ciphering(data)
#ciphertext = iv + pubkey + ctx.ciphering(data) # We will switch to this line after an upgrade period
mac = hmac_sha256(key_m, ciphertext) mac = hmac_sha256(key_m, ciphertext)
return iv + pubkey + ciphertext + mac return iv + pubkey + ciphertext + mac
#return ciphertext + mac # We will switch to this line after an upgrade period.
def decrypt(self, data, ciphername='aes-256-cbc'): def decrypt(self, data, ciphername='aes-256-cbc'):
""" """
@ -454,7 +456,14 @@ class ECC:
mac = data[i:] mac = data[i:]
key = sha512(self.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest() key = sha512(self.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest()
key_e, key_m = key[:32], key[32:] key_e, key_m = key[:32], key[32:]
"""
pyelliptic was changed slightly so that the hmac covers the
iv and pubkey. So let's have an upgrade period where we support
both the old and the new hmac'ing algorithms.
https://github.com/yann2192/pyelliptic/issues/17
"""
if hmac_sha256(key_m, ciphertext) != mac: if hmac_sha256(key_m, ciphertext) != mac:
raise RuntimeError("Fail to verify data") if hmac_sha256(key_m, data[:len(data) - 32]) != mac:
raise RuntimeError("Fail to verify data")
ctx = Cipher(key_e, iv, 0, ciphername) ctx = Cipher(key_e, iv, 0, ciphername)
return ctx.ciphering(ciphertext) return ctx.ciphering(ciphertext)