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// +build gofuzz
package merkletree
import (
"bytes"
"crypto/sha256"
)
// Fuzz is called by go-fuzz to look for inputs to BuildReaderProof that will
// not verify correctly.
func Fuzz(data []byte) int {
// Use the first two bytes to determine the proof index.
if len(data) < 2 {
return -1
}
index := 256*uint64(data[0]) + uint64(data[1])
data = data[2:]
// Build a reader proof for index 'index' using the remaining data as input
// to the reader. '64' is chosen as the only input size because that is the
// size relevant to the Sia project.
merkleRoot, proofSet, numLeaves, err := BuildReaderProof(bytes.NewReader(data), sha256.New(), 64, index)
if err != nil {
return 0
}
if !VerifyProof(sha256.New(), merkleRoot, proofSet, index, numLeaves) {
panic("verification failed!")
}
// Output is more interesting when there is enough data to contain the
// index.
if uint64(len(data)) > 64*index {
return 1
}
return 0
}
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