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Replace loops with TypedArray.prototype.set in the CipherTransformFactory class

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Also, adds `TypedArray.prototype.fill` usage in one spot.
This commit is contained in:
Jonas Jenwald 2025-03-08 15:56:44 +01:00
parent c65f1b0dae
commit 67065e43f5
1 changed files with 12 additions and 16 deletions
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28
src/core/crypto.js
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@ -894,21 +894,17 @@ class CipherTransformFactory {
hashData[i++] = CipherTransformFactory._defaultPasswordBytes[j++];
}
// as now the padded password in the hashData[0..i]
for (j = 0, n = ownerPassword.length; j < n; ++j) {
hashData[i++] = ownerPassword[j];
}
hashData.set(ownerPassword, i);
i += ownerPassword.length;
hashData[i++] = flags & 0xff;
hashData[i++] = (flags >> 8) & 0xff;
hashData[i++] = (flags >> 16) & 0xff;
hashData[i++] = (flags >>> 24) & 0xff;
for (j = 0, n = fileId.length; j < n; ++j) {
hashData[i++] = fileId[j];
}
hashData.set(fileId, i);
i += fileId.length;
if (revision >= 4 && !encryptMetadata) {
hashData[i++] = 0xff;
hashData[i++] = 0xff;
hashData[i++] = 0xff;
hashData[i++] = 0xff;
hashData.fill(0xff, i, i + 4);
i += 4;
}
let hash = calculateMD5(hashData, 0, i);
const keyLengthInBytes = keyLength >> 3;
@ -921,12 +917,12 @@ class CipherTransformFactory {
let cipher, checkData;
if (revision >= 3) {
for (i = 0; i < 32; ++i) {
hashData[i] = CipherTransformFactory._defaultPasswordBytes[i];
}
for (j = 0, n = fileId.length; j < n; ++j) {
hashData[i++] = fileId[j];
}
i = 0;
hashData.set(CipherTransformFactory._defaultPasswordBytes, i);
i += 32;
hashData.set(fileId, i);
i += fileId.length;
cipher = new ARCFourCipher(encryptionKey);
checkData = cipher.encryptBlock(calculateMD5(hashData, 0, i));
n = encryptionKey.length;