mirror of
https://github.com/l5yth/potato-mesh.git
synced 2026-07-06 09:52:02 +02:00
l5y
e0237108c6
* web: decrypt PSK-1 unencrypted messages on arrival * web: address review comments * web: use proper psk to decrypt instead of alias * cover missing unit test vectors * tests: run black formatter * web: fix tests * web: refine decryption data processing logic * web: address review comments * web: cover missing unit test vectors * web: cover missing unit test vectors * web: cover missing unit test vectors * web: cover missing unit test vectors
69 lines
2.1 KiB
Ruby
69 lines
2.1 KiB
Ruby
# Copyright © 2025-26 l5yth & contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# frozen_string_literal: true
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require_relative "channel_hash"
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require_relative "channel_names"
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module PotatoMesh
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module App
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module Meshtastic
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# Resolve candidate channel names for a hashed channel index.
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module RainbowTable
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module_function
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@tables = {}
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# Lookup candidate channel names for a hashed channel index.
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#
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# @param index [Integer, nil] channel hash byte.
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# @param psk_b64 [String, nil] base64 PSK or alias.
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# @return [Array<String>] list of candidate names.
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def channel_names_for(index, psk_b64:)
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return [] unless index.is_a?(Integer)
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table_for(psk_b64)[index] || []
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end
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# Build or retrieve the cached rainbow table for the given PSK.
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#
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# @param psk_b64 [String, nil] base64 PSK or alias.
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# @return [Hash{Integer=>Array<String>}] mapping of hash bytes to names.
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def table_for(psk_b64)
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key = psk_b64.to_s
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@tables[key] ||= build_table(psk_b64)
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end
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# Build a hash-to-name mapping for the provided PSK.
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#
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# @param psk_b64 [String, nil] base64 PSK or alias.
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# @return [Hash{Integer=>Array<String>}] mapping of hash bytes to names.
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def build_table(psk_b64)
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mapping = Hash.new { |hash, key| hash[key] = [] }
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ChannelNames::CHANNEL_NAME_CANDIDATES.each do |name|
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hash = ChannelHash.channel_hash(name, psk_b64)
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next unless hash
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mapping[hash] << name
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end
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mapping
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end
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end
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end
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end
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end
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