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expand filler bytes to full size, avoids panic

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This commit is contained in:
Olaoluwa Osuntokun
2015-10-22 13:20:52 -07:00
parent 066f72e6ec
commit 4b304adf2a
1 changed files with 4 additions and 3 deletions
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7
sphinx.go
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@@ -204,9 +204,10 @@ func NewMixHeader(dest LightningAddress, identifier [securityParameter]byte,
// "filler" bytes produced by this function at the last hop. Using this // "filler" bytes produced by this function at the last hop. Using this
// methodology, the size of the mix header stays constant at each hop. // methodology, the size of the mix header stays constant at each hop.
func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte) []byte { func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte) []byte {
var filler []byte fillerSize := (2*(numMaxHops-1) + 3) * securityParameter
filler := make([]byte, fillerSize)
for i := 1; i < numHops; i++ { for i := 1; i < numHops; i++ {
slice := (2*(numMaxHops-1) + 3) * securityParameter
padding := bytes.Repeat([]byte{0}, 2*securityParameter) padding := bytes.Repeat([]byte{0}, 2*securityParameter)
var tempBuf bytes.Buffer var tempBuf bytes.Buffer
@@ -216,7 +217,7 @@ func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte)
streamBytes := generateCipherStream(generateKey("rho", sharedSecrets[i-1]), streamBytes := generateCipherStream(generateKey("rho", sharedSecrets[i-1]),
numStreamBytes) numStreamBytes)
xor(filler, tempBuf.Bytes(), streamBytes[slice:]) xor(filler, tempBuf.Bytes(), streamBytes[fillerSize:])
} }
return filler return filler