47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
/*
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Lycan: anonymous message board using the onionr network
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Copyright (C) 2020 Kevin Froman
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero 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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This program 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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function reconstructHash(hash){
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return hash.padStart(64, 0)
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}
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function verifyBlock(raw, hash){
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var encoder = new TextEncoder("utf-8")
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hash = reconstructHash(hash)
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const blockSize = encoder.encode(raw).length;
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if (doHashHex(encoder.encode(raw)) != hash){
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throw new Error("Hash does not match")
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}
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if (blockSize > 10000){
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throw new Error("Block is too large")
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}
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else if(blockSize < 10){
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throw new Error("Block size is too small")
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}
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}
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function verifyTime(time){
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let epoch = Math.round(Date.now() / 1000);
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if ((epoch - time) > maxBlockAge){
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throw new Error("Block is too old")
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}
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if (time > (epoch + 60)){
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throw new Error("Block is skewed to the future")
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}
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}
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