1 files changed, 0 insertions, 155 deletions
diff --git a/python/lilliput_ae_1.py b/python/lilliput_ae_1.py
deleted file mode 100644
index 8064871..0000000
--- a/python/lilliput_ae_1.py
+++ /dev/null
@@ -1,155 +0,0 @@
-"""
-    OCB 3 for lilliput ae i
-"""
-
-from enum import Enum
-
-from constants import BLOCK_BYTES, NONCE_BYTES
-from helpers import (
-    ArrayToBlockbytesMatrix,
-    BlockbytesMatrixToBytes,
-    BuildAuth,
-    Padding10LSB,
-    TagValidationError,
-    XorState
-)
-import tbc
-
-
-TWEAK_BITS = 192
-TWEAK_BYTES = TWEAK_BITS//8
-
-
-def LowPart(array, number_bits):
-    shifted = 0
-    for byte in range(0, len(array)):
-        shifted |= (array[byte] << (8 * byte))
-
-    mask = 0
-    for bit in range(0, number_bits):
-        mask |= (0x1 << bit)
-
-    lower_part = shifted & mask
-
-    will_pad = 0
-    if number_bits % 8 != 0:
-        will_pad = 1
-
-    lower_part_byte = []
-    nb_bytes = number_bits//8 + will_pad
-    for byte in range(nb_bytes):
-        lower_part_byte.append(lower_part & 0xff)
-        lower_part = lower_part >> 8
-
-    return lower_part_byte
-
-
-class _MessageTweak(Enum):
-    BLOCK = 0b000
-    NO_PADDING = 0b0001
-    PAD = 0b0100
-    FINAL = 0b0101
-
-
-def TweakMessage(N, j, padding):
-    tweak = [0 for byte in range(0, TWEAK_BYTES)]
-    for byte in range(NONCE_BYTES-1, -1, -1):
-        tweak[byte + (TWEAK_BYTES-NONCE_BYTES)] |= (N[byte] & 0xf0) >> 4
-        tweak[byte + (TWEAK_BYTES-NONCE_BYTES-1)] |= (N[byte] & 0x0f) << 4
-
-    tweak[TWEAK_BYTES-NONCE_BYTES-1] |= ((j >> 64) & 0xf)
-    for byte in range(TWEAK_BYTES-NONCE_BYTES-2, -1, -1):
-        tweak[byte] = (j >> (8 * byte)) & 0xff
-
-    tweak[-1] |= padding.value<<4
-
-    return tweak
-
-
-def TreatMessageEnc(M, N, key):
-    checksum = [0 for byte in range(0, BLOCK_BYTES)]
-
-    l = len(M)//BLOCK_BYTES
-    padding_bytes = len(M)%BLOCK_BYTES
-
-    M = ArrayToBlockbytesMatrix(M)
-    C = []
-
-    for j in range(0, l):
-        checksum = XorState(checksum, M[j])
-        tweak = TweakMessage(N, j, _MessageTweak.BLOCK)
-        C.append(tbc.encrypt(tweak, key, M[j]))
-
-    if padding_bytes == 0:
-        tweak = TweakMessage(N, l, _MessageTweak.NO_PADDING)
-        Final = tbc.encrypt(tweak, key, checksum)
-
-    else:
-        m_padded = Padding10LSB(M[l])
-        checksum = XorState(checksum, m_padded)
-        tweak = TweakMessage(N, l, _MessageTweak.PAD)
-        pad = tbc.encrypt(tweak, key, [0 for byte in range(0, BLOCK_BYTES)])
-
-        lower_part = LowPart(pad, padding_bytes*8)
-        C.append(XorState(M[l], lower_part))
-        tweak_final = TweakMessage(N, l+1, _MessageTweak.FINAL)
-        Final = tbc.encrypt(tweak_final, key, checksum)
-
-    return (Final, C)
-
-
-def TreatMessageDec(C, N, key):
-    checksum = [0 for byte in range(0, BLOCK_BYTES)]
-
-    l = len(C)//BLOCK_BYTES
-    padding_bytes = len(C)%BLOCK_BYTES
-
-    C = ArrayToBlockbytesMatrix(C)
-    M = []
-
-    for j in range(0, l):
-        tweak = TweakMessage(N, j, _MessageTweak.BLOCK)
-        M.append(tbc.decrypt(tweak, key, C[j]))
-        checksum = XorState(checksum, M[j])
-
-    if padding_bytes == 0:
-        tweak = TweakMessage(N, l, _MessageTweak.NO_PADDING)
-        Final = tbc.encrypt(tweak, key, checksum)
-
-    else:
-        tweak = TweakMessage(N, l, _MessageTweak.PAD)
-        pad = tbc.encrypt(tweak, key, [0 for byte in range(0, BLOCK_BYTES)])
-        lower_part = LowPart(pad, padding_bytes*8)
-        M.append(XorState(C[l], lower_part))
-
-        m_padded = Padding10LSB(M[l])
-        checksum = XorState(checksum, m_padded)
-        tweak_final = TweakMessage(N, l+1, _MessageTweak.FINAL)
-        Final = tbc.encrypt(tweak_final, key, checksum)
-
-    return (Final, M)
-
-
-################################################################################
-def encrypt(A, M, N, key):
-    K = list(key)
-
-    Auth = BuildAuth(TWEAK_BITS, A, K)
-    (Final, C) = TreatMessageEnc(M, N, K)
-    tag = XorState(Auth, Final)
-
-    return BlockbytesMatrixToBytes(C), bytes(tag)
-
-
-def decrypt(A, C, N, tag, key):
-    K = list(key)
-    tag = list(tag)
-
-    Auth = BuildAuth(TWEAK_BITS, A, K)
-    (Final, M) = TreatMessageDec(C, N, K)
-    tag2 = XorState(Auth, Final)
-
-    if tag != tag2:
-        raise TagValidationError(tag, tag2)
-
-    return BlockbytesMatrixToBytes(M)