mirror of
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51 lines
1.4 KiB
Nim
51 lines
1.4 KiB
Nim
{.push raises: [].}
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import std/sequtils, stew/[byteutils, endians2, arrayops], nimcrypto/sha2
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import ../topics, ./message
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## 14/WAKU2-MESSAGE: Deterministic message hashing
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## https://rfc.vac.dev/spec/14/#deterministic-message-hashing
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type WakuMessageHash* = array[32, byte]
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func shortLog*(hash: WakuMessageHash): string =
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## Returns compact string representation of ``WakuMessageHash``.
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var hexhash = newStringOfCap(13)
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hexhash &= hash.toOpenArray(0, 1).to0xHex()
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hexhash &= "..."
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hexhash &= hash.toOpenArray(hash.len - 2, hash.high).toHex()
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hexhash
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func `$`*(hash: WakuMessageHash): string =
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shortLog(hash)
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const EmptyWakuMessageHash*: WakuMessageHash = [
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0,
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]
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converter fromBytes*(array: openArray[byte]): WakuMessageHash =
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var hash: WakuMessageHash
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discard copyFrom(hash, array)
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hash
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converter toBytesArray*(digest: MDigest[256]): WakuMessageHash =
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digest.data
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converter toBytes*(digest: MDigest[256]): seq[byte] =
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toSeq(digest.data)
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proc computeMessageHash*(pubsubTopic: PubsubTopic, msg: WakuMessage): WakuMessageHash =
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var ctx: sha256
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ctx.init()
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defer:
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ctx.clear()
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ctx.update(pubsubTopic.toBytes())
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ctx.update(msg.payload)
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ctx.update(msg.contentTopic.toBytes())
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ctx.update(msg.meta)
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ctx.update(toBytesBE(uint64(msg.timestamp)))
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return ctx.finish() # Computes the hash
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