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45 lines
1.1 KiB
Nim
45 lines
1.1 KiB
Nim
when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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std/sequtils,
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stew/[byteutils, endians2, arrayops],
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nimcrypto/sha2
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import
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../topics,
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./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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converter fromBytes*(array: openArray[byte]): WakuMessageHash =
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var hash: WakuMessageHash
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let copiedBytes = copyFrom(hash, array)
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assert copiedBytes == 32, "Waku message hash is 32 bytes"
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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: 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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