hardcoresushi/libgocryptfs
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tests: add TestCiphertextRange

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This commit is contained in:
Jakob Unterwurzacher 2015-09-08 22:34:42 +02:00
parent b13cc9686c
commit 28cdff5889
3 changed files with 32 additions and 5 deletions
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26
cryptfs/content_test.go
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@ -32,3 +32,29 @@ func TestSplitRange(t *testing.T) {
}
}
}
func TestCiphertextRange(t *testing.T) {
var ranges []testRange
ranges = append(ranges, testRange{0, 70000},
testRange{0, 10},
testRange{234, 6511},
testRange{65444, 54},
testRange{6654, 8945})
var key [16]byte
f := NewCryptFS(key, true)
for _, r := range(ranges) {
alignedOffset, alignedLength, skipBytes := f.CiphertextRange(r.offset, r.length)
if alignedLength < r.length {
t.Fail()
}
if alignedOffset % f.cipherBS != 0 {
t.Fail()
}
if r.offset % f.plainBS != 0 && skipBytes == 0 {
t.Fail()
}
}
}

9
cryptfs/cryptfs_content.go
View File

@ -115,7 +115,7 @@ func (be *CryptFS) minu64(x uint64, y uint64) uint64 {
// CiphertextRange - Get byte range in backing ciphertext corresponding
// to plaintext range. Returns a range aligned to ciphertext blocks.
func (be *CryptFS) CiphertextRange(offset uint64, length uint64) (uint64, uint64, int) {
func (be *CryptFS) CiphertextRange(offset uint64, length uint64) (alignedOffset uint64, alignedLength uint64, skipBytes int) {
// Decrypting the ciphertext will yield too many plaintext bytes. Skip this number
// of bytes from the front.
skip := offset % be.plainBS
@ -123,10 +123,11 @@ func (be *CryptFS) CiphertextRange(offset uint64, length uint64) (uint64, uint64
firstBlockNo := offset / be.plainBS
lastBlockNo := ( offset + length - 1 ) / be.plainBS
alignedOffset := firstBlockNo * be.cipherBS
alignedLength := (lastBlockNo - firstBlockNo + 1) * be.cipherBS
alignedOffset = firstBlockNo * be.cipherBS
alignedLength = (lastBlockNo - firstBlockNo + 1) * be.cipherBS
return alignedOffset, alignedLength, int(skip)
skipBytes = int(skip)
return alignedOffset, alignedLength, skipBytes
}
// Get the byte range in the ciphertext corresponding to blocks

2
pathfs_frontend/file.go
View File

@ -129,7 +129,7 @@ func (f *file) Write(data []byte, off int64) (uint32, fuse.Status) {
}
// Modify
blockData = f.cfs.MergeBlocks(oldData, blockData, int(b.Offset))
cryptfs.Debug.Printf("oldData=%d blockData=%d\n", len(oldData), len(blockData))
cryptfs.Debug.Printf("len(oldData)=%d len(blockData)=%d\n", len(oldData), len(blockData))
}
// Write
blockOffset, _ := b.CiphertextRange()