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Pass the 96bit nonce directly instead of in parts

This commit is contained in:
Juhani Krekelä 2020-06-24 18:54:36 +03:00
parent b5dea9b8dc
commit 322c7cb967
1 changed files with 2 additions and 2 deletions
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4
compact_chapoly.py
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@ -21,8 +21,8 @@ def poly1305(m,k):
return unu(a+s,128)
p16=lambda x:b'\x00'*(-len(x)%16)
tag=lambda a,k,n,c:poly1305(b''.join((a,p16(a),c,p16(c),unu(len(a),64),unu(len(c),64))),ccb(k,0,n)[:32])
def enc(a,k,i,f,p):c=bytes(chacha20(k,1,f+i,p));return c+tag(a,k,f+i,c)
def dec(a,k,i,f,e):
def enc(a,k,n,p):c=bytes(chacha20(k,1,n,p));return c+tag(a,k,n,c)
def dec(a,k,n,e):
c=e[:-16]
if not secrets.compare_digest(e[-16:],tag(a,k,f+i,c)):return None
return bytes(chacha20(k,1,f+i,c))