def KeySetupDec(cipherKey, Nk, verbose=1): # return key_schedule
assert is_key(cipherKey)
r = KeyScheduleMod2(
KeyScheduleMod1(KeySetupEnc(cipherKey, Nk, verbose), Nk + 6, verbose),
Nk + 6, verbose)
assert is_key_schedule(r)
return r
def KeySetupEnc4(cipherKey, verbose=1): # return key_schedule
"""
tvn: *multidim* array
rk[i][j] = cipherKey[4*i+j]
"""
print len(cipherKey)
assert is_key(cipherKey)
#rk = key_schedule'(others => [0, 0, 0, 0])
rk = [[0, 0, 0, 0]
] * roundkey_index #create an array of roundkey_index empty words
for i in range(4):
rk[i] = [
cipherKey[4 * i], cipherKey[4 * i + 1], cipherKey[4 * i + 2],
cipherKey[4 * i + 3]
]
# #tvn: traces
# if verbose >= 1:
# print 'rk cipherKey'
# print rk[:4], cipherKey
#--# assert 0 <= i and i <= 3 and
#--# (for all p in Integer range 0 .. i =>
#--# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3))))
for i in range(4, 44):
if i % 4 == 0:
rk[i] = word_xor_xor(rk[i - 4],
SubWord(RotWord(rk[i - 1], verbose=0),
verbose=0),
rcon[i / 4 - 1],
verbose=0)
else:
rk[i] = word_xor(rk[i - 4], rk[i - 1], verbose=0)
#tvn: traces
# if verbose >= 1:
# print 'rk_else cipherKey'
# print [rk[i] for i in range(4,44)], cipherKey
# assert 4 <= i and i <= 43 and
# (for all p in Integer range 0 .. 3 =>
# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3)))) and
# (for all p in Integer range 4 .. i =>
# ((p mod 4 = 0 and rk(p) = word_xor_xor(rk(p-4), SubWord(RotWord(rk(p-1))), rcon(p/4-1))) or
# (p mod 4 /= 0 and rk(p) = word_xor(rk(p-4), rk(p-1)))))
#disj
if verbose >= 1:
print 'rk cipherKey'
print rk, cipherKey
assert is_key_schedule(rk)
return rk
def AesKeySetupEnc(cipherKey, keyBits, verbose=1):
assert is_key(cipherKey)
Nr = keyBits / 32 + 6
rk = KeySetupEnc(cipherKey, keyBits / 32, verbose=0)
assert is_key_schedule(rk)
if verbose >= 1: #tvntraces
print 'Nr keyBits'
print Nr, keyBits
return Nr, rk
def KeySetupEnc8(cipherKey, verbose=1): # return key_schedule
"""
tvn: *multidim* array
rk[i][j] = cipherKey[4*i+j]
"""
assert is_key(cipherKey)
rk = [[0, 0, 0, 0]
] * roundkey_index #create an array of roundkey_index empty words
for i in range(8):
rk[i] = [
cipherKey[4 * i], cipherKey[4 * i + 1], cipherKey[4 * i + 2],
cipherKey[4 * i + 3]
]
if verbose >= 1:
print 'l1: rk cipherKey'
print 'l1: ', rk, cipherKey
# assert 0 <= i and i <= 7 and
# (for all p in Integer range 0 .. i =>
# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3))))
for i in range(8, 60):
if (i % 8 == 0):
rk[i] = word_xor_xor(rk[i - 8],
SubWord(RotWord(rk[i - 1], verbose=0),
verbose=0),
rcon[i / 8 - 1],
verbose=0)
elif (i % 4 == 0):
rk[i] = word_xor(rk[i - 8],
SubWord(rk[i - 1], verbose=0),
verbose=0)
else:
rk[i] = word_xor(rk[i - 8], rk[i - 1], verbose=0)
# assert 8 <= i and i <= 59 and
# (for all p in Integer range 0 .. 7 =>
# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3)))) and
# (for all p in Integer range 8 .. i =>
# ((p % 8 = 0 and rk(p) = word_xor_xor(rk(p-8), SubWord(RotWord(rk(p-1))), rcon(p/8-1))) or
# (p % 8 /= 0 and p % 4 = 0 and rk(p) = word_xor(rk(p-8), SubWord(rk(p-1)))) or
# (p % 8 /= 0 and p % 4 /= 0 and rk(p) = word_xor(rk(p-8), rk(p-1)))))
if verbose >= 1:
print 'l0: rk cipherKey'
print 'l0: ', rk, cipherKey
assert is_key_schedule(rk)
return rk
def KeySetupEnc(cipherKey, Nk, verbose=1): #return key_schedule
assert is_key(cipherKey)
rk = [[0, 0, 0, 0]
] * roundkey_index #create an array of roundkey_index empty words
if (Nk == 4):
rk = KeySetupEnc4(cipherKey, verbose)
if (Nk == 6):
rk = KeySetupEnc6(cipherKey, verbose)
if (Nk == 8):
rk = KeySetupEnc8(cipherKey, verbose)
assert is_key_schedule(rk)
return rk
def KeySetupEnc6(cipherKey, verbose=1): # return key_schedule
"""
tvn: *multidim* array
rk[i][j] = cipherKey[4*i+j]
"""
assert is_key(cipherKey)
rk = [[0, 0, 0, 0]
] * roundkey_index #create an array of roundkey_index empty words
for i in range(6):
rk[i] = [
cipherKey[4 * i], cipherKey[4 * i + 1], cipherKey[4 * i + 2],
cipherKey[4 * i + 3]
]
# assert 0 <= i and i <= 5 and
# (for all p in Integer range 0 .. i =>
# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3))))
#tvn: traces
# if verbose >= 1:
# print 'rk cipherKey'
# print rk[:6], cipherKey
for i in range(6, 52):
if (i % 6 == 0):
rk[i] = word_xor_xor(rk[i - 6],
SubWord(RotWord(rk[i - 1], verbose=0),
verbose=0),
rcon[i / 6 - 1],
verbose=0)
else:
rk[i] = word_xor(rk[i - 6], rk[i - 1], verbose=0)
# assert 6 <= i and i <= 51 and
# (for all p in Integer range 0 .. 5 =>
# (rk(p) = [cipherKey(4*p), cipherKey(4*p+1), cipherKey(4*p+2), cipherKey(4*p+3)))) and
# (for all p in Integer range 6 .. i =>
# ((p mod 6 = 0 and rk(p) = word_xor_xor(rk(p-6), SubWord(RotWord(rk(p-1))), rcon(p/6-1))) or
# (p mod 6 /= 0 and rk(p) = word_xor(rk(p-6), rk(p-1)))))
#tvn: traces
if verbose >= 1:
print 'rk cipherKey'
print rk, cipherKey
assert is_key_schedule(rk)
return rk
def AesKeySetupDec(cipherKey, keyBits, verbose=1):
assert is_key(cipherKey)
assert keyBits in keybit_vals
Nr = keyBits / 32 + 6
rk = KeySetupDec(cipherKey, keyBits / 32, verbose=0)
if verbose >= 1: #tvntraces
print 'l0: cipherKey rk'
print 'l0: ', cipherKey, rk
assert is_key_schedule(rk)
assert Nr in nr_vals
return Nr, rk
def KeySetupDec(cipherKey, Nk, verbose=1): # return key_schedule
assert is_key(cipherKey)
assert Nk in nk_vals
rk = KeyScheduleMod2(KeyScheduleMod1(KeySetupEnc(cipherKey, Nk, verbose=0),
Nk + 6,
verbose=0),
Nk + 6,
verbose=0)
assert is_key_schedule(rk)
if verbose >= 1:
print 'l0: rk cipherKey'
print 'l0: ', rk, cipherKey
return rk
def KeySetupEnc(cipherKey, Nk, verbose=1):
assert is_key(cipherKey)
assert Nk in nk_vals
rk = [[0, 0, 0, 0]
] * roundkey_index #create an array of roundkey_index empty words
if (Nk == 4):
rk = KeySetupEnc4(cipherKey, verbose=0)
if (Nk == 6):
rk = KeySetupEnc6(cipherKey, verbose=0)
if (Nk == 8):
rk = KeySetupEnc8(cipherKey, verbose=0)
assert is_key_schedule(rk)
if verbose >= 1:
print 'l0: rk cipherKey'
print 'l0: ', rk, cipherKey
return rk