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properly calculate filler bytes for header padding

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* Number of filler bytes should decrease for each hop in the path. Not
remain constant.
This commit is contained in:
Olaoluwa Osuntokun 2015-10-24 12:23:30 -07:00
parent 7d3ce833a7
commit e7def0be20
1 changed files with 3 additions and 3 deletions
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6
sphinx.go
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@ -203,10 +203,10 @@ func NewMixHeader(dest LightningAddress, identifier [securityParameter]byte,
// "filler" bytes produced by this function at the last hop. Using this
// methodology, the size of the mix header stays constant at each hop.
func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte) []byte {
fillerSize := (2*(numMaxHops-1) + 3) * securityParameter
filler := make([]byte, fillerSize)
filler := make([]byte, 2*(numHops-1)*securityParameter)
for i := 1; i < numHops; i++ {
totalFillerSize := (2*(numMaxHops-i) + 3) * securityParameter
padding := bytes.Repeat([]byte{0}, 2*securityParameter)
var tempBuf bytes.Buffer
@ -216,7 +216,7 @@ func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte)
streamBytes := generateCipherStream(generateKey("rho", sharedSecrets[i-1]),
numStreamBytes)
xor(filler, tempBuf.Bytes(), streamBytes[fillerSize:])
xor(filler, tempBuf.Bytes(), streamBytes[totalFillerSize:])
}
return filler