From ef4135eabe5cb25f8972371c5681e1611ce0cde9 Mon Sep 17 00:00:00 2001 From: obscuren Date: Mon, 15 Dec 2014 16:12:34 +0100 Subject: Added topic utility functions to whisper --- whisper/util.go | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 whisper/util.go (limited to 'whisper/util.go') diff --git a/whisper/util.go b/whisper/util.go new file mode 100644 index 000000000..abef1d667 --- /dev/null +++ b/whisper/util.go @@ -0,0 +1,27 @@ +package whisper + +import "github.com/ethereum/go-ethereum/crypto" + +func hashTopic(topic []byte) []byte { + return crypto.Sha3(topic)[:4] +} + +// NOTE this isn't DRY, but I don't want to iterate twice. + +// Returns a formatted topics byte slice. +// data: unformatted data (e.g., no hashes needed) +func Topics(data [][]byte) [][]byte { + d := make([][]byte, len(data)) + for i, byts := range data { + d[i] = hashTopic(byts) + } + return d +} + +func TopicsFromString(data []string) [][]byte { + d := make([][]byte, len(data)) + for i, str := range data { + d[i] = hashTopic([]byte(str)) + } + return d +} -- cgit v1.2.3