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5fc1da3abe
This commit adds the MsgHash helper function which can be used to calculate the digest of a message to be signed using schnorr signatures.
31 lines
883 B
Go
31 lines
883 B
Go
package netann
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import (
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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)
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// MsgHashTag will prefix the message name and the field name in order to
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// construct the message tag.
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const MsgHashTag = "lightning"
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// MsgTag computes the full tag that will be used to prefix a message before
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// calculating the tagged hash. The tag is constructed as follows:
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//
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// tag = "lightning"||"msg_name"||"field_name"
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func MsgTag(msgName, fieldName string) []byte {
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tag := []byte(MsgHashTag)
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tag = append(tag, []byte(msgName)...)
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return append(tag, []byte(fieldName)...)
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}
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// MsgHash computes the tagged hash of the given message as follows:
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//
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// tag = "lightning"||"msg_name"||"field_name"
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// hash = sha256(sha246(tag) || sha256(tag) || msg)
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func MsgHash(msgName, fieldName string, msg []byte) *chainhash.Hash {
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tag := MsgTag(msgName, fieldName)
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return chainhash.TaggedHash(tag, msg)
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}
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