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crypt: Fix obfuscate filename encryption method

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Fix issue #1315 where filenames calculated with a base distance of zero
(ie the characters add up to 0(mod 256) aren't de-obfuscated on reading.
This was due to overloading of "0" to also mean "invalid UTF8; no rotation",
so we remove that double meaning
This commit is contained in:
Stephen Harris 2017-04-14 08:30:18 -04:00 committed by Nick Craig-Wood
parent bc25190fc7
commit e1647a5a08
2 changed files with 5 additions and 4 deletions
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6
crypt/cipher.go
View File

@ -298,9 +298,9 @@ func (c *cipher) obfuscateSegment(plaintext string) string {
}
// If the string isn't valid UTF8 then don't rotate; just
// prepend a 0.
// prepend a !.
if !utf8.ValidString(plaintext) {
return "0." + plaintext
return "!." + plaintext
}
// Calculate a simple rotation based on the filename and
@ -388,7 +388,7 @@ func (c *cipher) deobfuscateSegment(ciphertext string) (string, error) {
return "", ErrorNotAnEncryptedFile
} // No .
num := ciphertext[:pos]
if num == "0" {
if num == "!" {
// No rotation; probably original was not valid unicode
return ciphertext[pos+1:], nil
}

3
crypt/cipher_test.go
View File

@ -243,7 +243,7 @@ func TestDecryptFileName(t *testing.T) {
{NameEncryptionOff, "1/12/123.bin", "1/12/123", nil},
{NameEncryptionOff, "1/12/123.bix", "", ErrorNotAnEncryptedFile},
{NameEncryptionOff, ".bin", "", ErrorNotAnEncryptedFile},
{NameEncryptionObfuscated, "0.hello", "hello", nil},
{NameEncryptionObfuscated, "!.hello", "hello", nil},
{NameEncryptionObfuscated, "hello", "", ErrorNotAnEncryptedFile},
{NameEncryptionObfuscated, "161.\u00e4", "\u00a1", nil},
{NameEncryptionObfuscated, "160.\u03c2", "\u03a0", nil},
@ -264,6 +264,7 @@ func TestEncDecMatches(t *testing.T) {
{NameEncryptionStandard, "1/2/3/4"},
{NameEncryptionOff, "1/2/3/4"},
{NameEncryptionObfuscated, "1/2/3/4/!hello\u03a0"},
{NameEncryptionObfuscated, "Avatar The Last Airbender"},
} {
c, _ := newCipher(test.mode, "", "")
out, err := c.DecryptFileName(c.EncryptFileName(test.in))