/**
* Set a timestamp and calculate a digital signature. First
* calculate the SHA1 hash of the pubKey, title, timestamp,
* and content lines, excluding the terminating CRLF in each
* case, then encrypt that using the RSA private key supplied.
*
* @param key RSAKey whose secret materials are used to sign
*/
func (sl *SignedBList) Sign(skPriv *rsa.PrivateKey) (err error) {
var (
digSig, hash []byte
)
if sl.DigSig != nil {
err = ListAlreadySigned
} else if skPriv == nil {
err = NilPrivateKey
} else {
sl.Timestamp = xu.Timestamp(time.Now().UnixNano())
hash, err = sl.HashBody()
if err == nil {
digSig, err = rsa.SignPKCS1v15(
rand.Reader, skPriv, crypto.SHA1, hash)
if err == nil {
sl.DigSig = digSig
}
}
if err != nil {
sl.Timestamp = 0 // restore to default
}
}
return
}
func (s *XLSuite) TestChunkList(c *C) {
if VERBOSITY > 0 {
fmt.Println("TEST_CHUNK_LIST")
}
rng := xr.MakeSimpleRNG()
dataLen := 1 + rng.Intn(3*MAX_DATA_BYTES)
data := make([]byte, dataLen)
rng.NextBytes(data)
reader := bytes.NewReader(data)
d := sha1.New()
d.Write(data)
datum := d.Sum(nil)
nodeID, err := xi.NewNodeID(datum)
c.Assert(err, IsNil)
skPriv, err := rsa.GenerateKey(rand.Reader, 1024) // cheap key
sk := &skPriv.PublicKey
title := rng.NextFileName(8)
timestamp := xu.Timestamp(rng.Int63())
cl, err := NewChunkList(sk, title, timestamp, reader, int64(dataLen), datum, nil)
c.Assert(err, IsNil)
c.Assert(cl, NotNil)
chunkCount := uint((dataLen + MAX_DATA_BYTES - 1) / MAX_DATA_BYTES)
c.Assert(cl.Size(), Equals, chunkCount)
for i := uint(0); i < chunkCount; i++ {
actual, err := cl.HashItem(i)
c.Assert(err, IsNil)
expected := s.calculateChunkHash(c, i, datum, data)
// DEBUG
fmt.Printf("chunk %d hash\n actual %x\n expected %x\n",
i, actual, expected)
// END
//c.Assert(actual, DeepEquals, expected)
// compare with result of calculation in NewChunk -----------
var chunk *Chunk
var slice []byte
if i == chunkCount-1 {
slice = data[i*MAX_DATA_BYTES:]
} else {
slice = data[i*MAX_DATA_BYTES : (i+1)*MAX_DATA_BYTES]
}
chunk, err = NewChunk(nodeID, uint32(i), slice)
c.Assert(err, Equals, nil)
c.Assert(chunk.GetChunkHash(), DeepEquals, expected)
}
}
func (s *XLSuite) TestChunkListAssyDisassy(c *C) {
if VERBOSITY > 0 {
fmt.Println("TEST_CHUNK_LIST_ASSY_DISASSY")
}
rng := xr.MakeSimpleRNG()
// make a slice 3 to 7 chunks long, fill with random-ish data ---
chunkCount := 3 + rng.Intn(5) // so 3 to 7, inclusive
lastChunkLen := 1 + rng.Intn(MAX_DATA_BYTES-1)
dataLen := (chunkCount-1)*MAX_DATA_BYTES + lastChunkLen
data := make([]byte, dataLen)
rng.NextBytes(data)
// calculate datum, the SHA hash of the data --------------------
//d := sha3.NewKeccak256()
d := sha1.New()
d.Write(data)
hash := d.Sum(nil)
datum, err := xi.NewNodeID(hash)
c.Assert(err, IsNil)
// create tmp if it doesn't exist -------------------------------
found, err := xf.PathExists("tmp")
c.Assert(err, IsNil)
if !found {
err = os.MkdirAll("tmp", 0755)
c.Assert(err, IsNil)
}
// create scratch subdir with unique name -----------------------
var pathToU string
for {
dirName := rng.NextFileName(8)
pathToU = path.Join("tmp", dirName)
found, err = xf.PathExists(pathToU)
c.Assert(err, IsNil)
if !found {
break
}
}
// create a FLAT uDir at that point -----------------------------
myU, err := u.New(pathToU, u.DIR_FLAT, 0) // 0 means default perm
c.Assert(err, IsNil)
// write the test data into uDir --------------------------------
bytesWritten, key, err := myU.PutData(data, datum.Value())
c.Assert(err, IsNil)
c.Assert(bytes.Equal(datum.Value(), key), Equals, true)
c.Assert(bytesWritten, Equals, int64(dataLen))
skPriv, err := rsa.GenerateKey(rand.Reader, 1024) // cheap key
sk := &skPriv.PublicKey
c.Assert(err, IsNil)
c.Assert(skPriv, NotNil)
// Verify the file is present in uDir ---------------------------
// (yes this is a test of uDir logic but these are early days ---
// XXX uDir.Exist(arg) - arg should be []byte, no string
keyStr := hex.EncodeToString(key)
found, err = myU.HexKeyExists(keyStr)
c.Assert(err, IsNil)
c.Assert(found, Equals, true)
// use the data file to build a chunkList, writing the chunks ---
title := rng.NextFileName(8)
now := xu.Timestamp(time.Now().UnixNano())
// make a reader --------------------------------------
pathToData, err := myU.GetPathForHexKey(keyStr)
c.Assert(err, IsNil)
reader, err := os.Open(pathToData) // open for read only
c.Assert(err, IsNil)
defer reader.Close()
chunkList, err := NewChunkList(sk, title, now, reader, int64(dataLen), key, myU)
c.Assert(err, IsNil)
err = chunkList.Sign(skPriv)
c.Assert(err, IsNil)
digSig, err := chunkList.GetDigSig()
c.Assert(err, IsNil)
c.Assert(bytes.Equal(digSig, chunkList.digSig), Equals, true)
err = chunkList.Verify()
c.Assert(err, IsNil)
// REBUILD AND CHECK --------------------------------------------
// rebuild the complete file from the chunkList and files present
// in myU
u2, err := u.New(pathToU, u.DIR_FLAT, 0) // 0 means default perm
c.Assert(err, IsNil)
var data2 []byte // should become copy of original
count := chunkList.Size()
for i := uint(0); i < count; i++ {
chunkHash, err := chunkList.HashItem(i)
c.Assert(err, IsNil)
c.Assert(chunkHash, NotNil)
var raw []byte
// THIS IS A CHUNK, and so has a header, possibly some
// padding, and then its own hash :-). Need to verify
// and discard the last, then drop the padding.
// CORRECTION: hash should NOT have been written to disk
raw, err = u2.GetData(chunkHash)
c.Assert(err, IsNil)
chunk := &Chunk{packet: raw}
ndx := chunk.GetIndex()
c.Assert(ndx, Equals, uint32(i))
rawLen := uint32(len(raw))
dataLen := chunk.GetDataLen()
//fmt.Printf("chunk %2d: index is %8d\n", i, ndx)
//fmt.Printf(" len raw is %6d (%4x)\n", rawLen, rawLen)
//fmt.Printf(" dataLen is %6d (%4x)\n", dataLen, dataLen)
// if this isn't true, we get a panic
c.Assert(dataLen < rawLen, Equals, true)
payload := chunk.GetData()
data2 = append(data2, payload...)
}
// verify that the content key of the rebuilt file is identical to
// that of the original
//d2D := sha3.NewKeccak256()
d2D := sha1.New()
d2D.Write(data2)
hash2 := d2D.Sum(nil)
datum2, err := xi.NewNodeID(hash2)
c.Assert(err, IsNil)
// DEBUG
//fmt.Printf("datum: %x\ndatum2: %x\n", datum.Value(), datum2.Value())
//fmt.Printf("data: %x\ndata2: %x\n", data, data2)
// END
c.Assert(bytes.Equal(datum.Value(), datum2.Value()), Equals, true)
// presumably pure pedantry: verify that the file contents are
// also equal
c.Assert(bytes.Equal(data, data2), Equals, true)
}