def pack(self):
"""Return the text representation of this message."""
c = self.contents
fields = [("Message-type",
{ 'TXT' : "plaintext",
'LONG' : "overcompressed",
'BIN' : "binary",
'ENC' : "encrypted",
'FRAG' : 'fragment' }[self.messageType]),
]
if self.messageType == 'ENC':
fields.append(("Decoding-handle",
binascii.b2a_base64(self.tag).strip()))
return armorText(c, MESSAGE_ARMOR_NAME, headers=fields,
base64=(self.messageType!='TXT'))
def _writeEncryptedFile(fname, password, magic, data):
"""Write 'data' into an encrypted file named 'fname', replacing it
if necessary. Encrypts the data with the password 'password',
and uses the filetype 'magic'."""
assert len(magic) == MAGIC_LEN
prng = getCommonPRNG()
length = struct.pack("!L", len(data))
paddingLen = ceilDiv(len(data), 1024)*1024 - len(data)
padding = prng.getBytes(paddingLen)
data = "".join([length,data,padding])
salt = prng.getBytes(SALT_LEN)
key = sha1(salt+password+salt)[:AES_KEY_LEN]
digest = sha1("".join([data,salt,magic]))
encrypted = ctr_crypt(data+digest, key)
contents = "".join([magic,"\x00",salt,encrypted])
writeFile(fname, armorText(contents,
"TYPE III KEYRING", [("Version","0.1")]))
def _writeEncryptedFile(fname, password, magic, data):
"""Write 'data' into an encrypted file named 'fname', replacing it
if necessary. Encrypts the data with the password 'password',
and uses the filetype 'magic'."""
assert len(magic) == MAGIC_LEN
prng = getCommonPRNG()
length = struct.pack("!L", len(data))
paddingLen = ceilDiv(len(data), 1024) * 1024 - len(data)
padding = prng.getBytes(paddingLen)
data = "".join([length, data, padding])
salt = prng.getBytes(SALT_LEN)
key = sha1(salt + password + salt)[:AES_KEY_LEN]
digest = sha1("".join([data, salt, magic]))
encrypted = ctr_crypt(data + digest, key)
contents = "".join([magic, "\x00", salt, encrypted])
writeFile(fname,
armorText(contents, "TYPE III KEYRING", [("Version", "0.1")]))
def pack(self):
"""Return the text representation of this message."""
c = self.contents
fields = [
("Message-type", {
'TXT': "plaintext",
'LONG': "overcompressed",
'BIN': "binary",
'ENC': "encrypted",
'FRAG': 'fragment'
}[self.messageType]),
]
if self.messageType == 'ENC':
fields.append(
("Decoding-handle", binascii.b2a_base64(self.tag).strip()))
return armorText(c,
MESSAGE_ARMOR_NAME,
headers=fields,
base64=(self.messageType != 'TXT'))
def packAsText(self):
"""Returns the external text representation of this reply block"""
return armorText(self.pack(), RB_ARMOR_NAME,
headers=(("Version", "0.2"),))
def packAsText(self):
"""Returns the external text representation of this reply block"""
return armorText(self.pack(),
RB_ARMOR_NAME,
headers=(("Version", "0.2"), ))
