def __init__(self,
aes_properties: bytes,
password: str,
blocksize: Optional[int] = None) -> None:
firstbyte = aes_properties[0]
numcyclespower = firstbyte & 0x3F
if firstbyte & 0xC0 != 0:
saltsize = (firstbyte >> 7) & 1
ivsize = (firstbyte >> 6) & 1
secondbyte = aes_properties[1]
saltsize += secondbyte >> 4
ivsize += secondbyte & 0x0F
assert len(aes_properties) == 2 + saltsize + ivsize
salt = aes_properties[2:2 + saltsize]
iv = aes_properties[2 + saltsize:2 + saltsize + ivsize]
assert len(salt) == saltsize
assert len(iv) == ivsize
assert numcyclespower <= 24
if ivsize < 16:
iv += bytes("\x00" * (16 - ivsize), "ascii")
key = calculate_key(password.encode("utf-16LE"), numcyclespower,
salt, "sha256")
self.cipher = AES.new(key, AES.MODE_CBC, iv)
if blocksize:
self.buf = Buffer(size=blocksize + 16)
else:
self.buf = Buffer(size=get_default_blocksize() + 16)
else:
raise UnsupportedCompressionMethodError
def __init__(self, aes_properties: bytes, password: str,
coders: List[Dict[str, Any]]) -> None:
byte_password = password.encode('utf-16LE')
firstbyte = aes_properties[0]
numcyclespower = firstbyte & 0x3f
if firstbyte & 0xc0 != 0:
saltsize = (firstbyte >> 7) & 1
ivsize = (firstbyte >> 6) & 1
secondbyte = aes_properties[1]
saltsize += (secondbyte >> 4)
ivsize += (secondbyte & 0x0f)
assert len(aes_properties) == 2 + saltsize + ivsize
salt = aes_properties[2:2 + saltsize]
iv = aes_properties[2 + saltsize:2 + saltsize + ivsize]
assert len(salt) == saltsize
assert len(iv) == ivsize
assert numcyclespower <= 24
if ivsize < 16:
iv += bytes('\x00' * (16 - ivsize), 'ascii')
key = calculate_key(byte_password, numcyclespower, salt, 'sha256')
self.lzma_decompressor = self._set_lzma_decompressor(coders)
self.cipher = AES.new(key, AES.MODE_CBC, iv)
self.buf = b''
self.flushed = False
else:
raise UnsupportedCompressionMethodError
def __init__(self, password: str) -> None:
self.cycles = 19 # FIXME
self.iv = get_random_bytes(16)
self.salt = b''
self.method = CompressionMethod.CRYPT_AES256_SHA256
key = calculate_key(password.encode('utf-16LE'), self.cycles, self.salt, 'sha256')
self.iv += bytes(self.AES_CBC_BLOCKSIZE - len(self.iv)) # zero padding if iv < AES_CBC_BLOCKSIZE
self.cipher = AES.new(key, AES.MODE_CBC, self.iv)
self.flushed = False
self.buf = Buffer(size=READ_BLOCKSIZE + self.AES_CBC_BLOCKSIZE * 2)
def __init__(self, password: str, blocksize: Optional[int] = None) -> None:
self.cycles = 19 # as same as p7zip
self.iv = get_random_bytes(16)
self.salt = b""
self.method = CompressionMethod.CRYPT_AES256_SHA256
key = calculate_key(password.encode("utf-16LE"), self.cycles,
self.salt, "sha256")
self.iv += bytes(
self.AES_CBC_BLOCKSIZE -
len(self.iv)) # zero padding if iv < AES_CBC_BLOCKSIZE
self.cipher = AES.new(key, AES.MODE_CBC, self.iv)
self.flushed = False
if blocksize:
self.buf = Buffer(size=blocksize + self.AES_CBC_BLOCKSIZE * 2)
else:
self.buf = Buffer(size=get_default_blocksize() +
self.AES_CBC_BLOCKSIZE * 2)
def __init__(self, aes_properties: bytes, password: str) -> None:
firstbyte = aes_properties[0]
numcyclespower = firstbyte & 0x3f
if firstbyte & 0xc0 != 0:
saltsize = (firstbyte >> 7) & 1
ivsize = (firstbyte >> 6) & 1
secondbyte = aes_properties[1]
saltsize += (secondbyte >> 4)
ivsize += (secondbyte & 0x0f)
assert len(aes_properties) == 2 + saltsize + ivsize
salt = aes_properties[2:2 + saltsize]
iv = aes_properties[2 + saltsize:2 + saltsize + ivsize]
assert len(salt) == saltsize
assert len(iv) == ivsize
assert numcyclespower <= 24
if ivsize < 16:
iv += bytes('\x00' * (16 - ivsize), 'ascii')
key = calculate_key(password.encode('utf-16LE'), numcyclespower, salt, 'sha256')
self.cipher = AES.new(key, AES.MODE_CBC, iv)
self.buf = Buffer(size=READ_BLOCKSIZE + 16)
else:
raise UnsupportedCompressionMethodError
