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LibCrypto: Tweak ::prune_padding() to be more intuitive with loop bounds

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This commit is contained in:
AnotherTest 2020-04-29 20:17:24 +04:30 • committed by Andreas Kling
parent b394543d3c
commit 4d932ce701
Notes: sideshowbarker 2024-07-19 07:03:46 +09:00
1 changed files with 4 additions and 4 deletions
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8
Libraries/LibCrypto/Cipher/Mode/Mode.h
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@ -68,8 +68,8 @@ protected:
// cannot be padding (the entire block cannot be padding)
return;
}
for (auto i = maybe_padding_length; i > 0; --i) {
if (data[size - i] != maybe_padding_length) {
for (auto i = size - maybe_padding_length; i < size; ++i) {
if (data[i] != maybe_padding_length) {
// not padding, part of data
return;
}
@ -84,8 +84,8 @@ protected:
return;
}
// FIXME: If we want to constant-time operations, this loop should not stop
for (auto i = maybe_padding_length; i > 0; --i) {
if (data[size - i - 1] != maybe_padding_length) {
for (auto i = size - maybe_padding_length - 1; i < size; ++i) {
if (data[i] != maybe_padding_length) {
// note that this is likely invalid padding
return;
}