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refactor: deduplicate cipher logic

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daydreamer-json
2026-04-12 23:00:22 +09:00
parent 532add3d98
commit 80bfb5412f
1 changed files with 12 additions and 20 deletions
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32
src/utils/cipher.ts
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@@ -1,28 +1,20 @@
function decryptResIndex(encData: Uint8Array, key: string): Uint8Array { function processResIndex(data: Uint8Array, key: string, isEncrypt: boolean): Uint8Array {
const keyBytes = Buffer.from(key, 'utf-8'); const keyBytes = Buffer.from(key, 'utf-8');
const keyLength = keyBytes.length; const result = new Uint8Array(data.length);
const result = new Uint8Array(encData.length);
for (let i = 0; i < encData.length; i++) { for (let i = 0; i < data.length; i++) {
const encByte = encData[i]!; const keyByte = keyBytes[i % keyBytes.length]!;
const keyByte = keyBytes[i % keyLength]!; result[i] = isEncrypt ? (data[i]! + keyByte) % 256 : (data[i]! - keyByte + 256) % 256;
result[i] = (encByte - keyByte + 256) % 256;
} }
return result; return result;
} }
function decryptResIndex(encData: Uint8Array, key: string): Uint8Array {
return processResIndex(encData, key, false);
}
function encryptResIndex(plainData: Uint8Array, key: string): Uint8Array { function encryptResIndex(plainData: Uint8Array, key: string): Uint8Array {
const keyBytes = Buffer.from(key, 'utf-8'); return processResIndex(plainData, key, true);
const keyLength = keyBytes.length;
const result = new Uint8Array(plainData.length);
for (let i = 0; i < plainData.length; i++) {
const plainByte = plainData[i]!;
const keyByte = keyBytes[i % keyLength]!;
result[i] = (plainByte + keyByte) % 256;
}
return result;
} }
export default { export default { decryptResIndex, encryptResIndex };
decryptResIndex,
encryptResIndex,
};