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38 lines
1.4 KiB
Go
38 lines
1.4 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Contains the Whisper protocol Topic element. For formal details please see
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// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#topics.
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package whisper5
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import "github.com/ethereum/go-ethereum/crypto"
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func NewTopic(data []byte) TopicType {
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prefix := [4]byte{}
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copy(prefix[:], crypto.Keccak256(data)[:4])
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return TopicType(prefix)
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}
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// NewTopicFromString creates a topic using the binary data contents of the specified string.
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func NewTopicFromString(data string) TopicType {
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return NewTopic([]byte(data))
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}
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// String converts a topic byte array to a string representation.
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func (self *TopicType) String() string {
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return string(self[:])
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}
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