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llHMAC implementation (without importing hmac)

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Sei Lisa 2023-02-03 21:48:33 +01:00
parent 1bd9551c2f
commit 500a8bb751
5 changed files with 71 additions and 3 deletions
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37
lslopt/lslbasefuncs.py
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@ -1307,6 +1307,41 @@ def llHash(s):
hash = (hash * 65599 + ord(i)) & 0xFFFFFFFF
return S32(hash)
def llHMAC(pwd, data, alg):
pwd = bytewrap(uniwrap(fs(pwd)).encode('utf8'))
data = bytewrap(uniwrap(fs(data)).encode('utf8'))
alg = fs(alg)
hash = None
if alg == u'md5':
hash = hashlib.md5()
elif alg == u'sha1':
hash = hashlib.sha1()
elif alg == u'sha224':
hash = hashlib.sha224()
elif alg == u'sha256':
hash = hashlib.sha256()
elif alg == u'sha384':
hash = hashlib.sha384()
elif alg == u'sha512':
hash = hashlib.sha512()
if hash is None:
raise ELSLCantCompute # we don't have info on how it behaves yet
# Calculate the HMAC here, to avoid requiring yet another module
if len(pwd) > hash.block_size:
tmp = hash.copy()
tmp.update(pwd)
pwd = bytewrap(tmp.digest())
del tmp
if len(pwd) < hash.block_size:
pwd += bytewrap(b'\x00') * (hash.block_size - len(pwd))
xorbytes = lambda a, b: bytewrap(x ^ y for (x, y) in zip(a, b))
ipadded = xorbytes(pwd, bytewrap(b'\x36') * hash.block_size)
opadded = xorbytes(pwd, bytewrap(b'\x5C') * hash.block_size)
ohash = hash.copy()
hash.update(ipadded + data)
ohash.update(opadded + hash.digest())
return b64encode(ohash.digest()).decode('utf8')
def llInsertString(s, pos, src):
s = fs(s)
pos = fi(pos)
@ -1316,7 +1351,7 @@ def llInsertString(s, pos, src):
def llIntegerToBase64(x):
x = fi(x)
return (b64encode(bytearray(((x>>24)&255, (x>>16)&255, (x>>8)&255, x&255)))
return (b64encode(bytewrap(((x>>24)&255, (x>>16)&255, (x>>8)&255, x&255)))
.decode('utf8'))
def llLinear2sRGB(v):