fix: reduce buffer allocation size #4830
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Description
Reduces the size of a buffer allocation when padding messages for encryption.
Closes issue 4829.
Motivation and Context
As noted in issue 4829, the
BytesMut
used to hold messages during padding and encryption allocates more space than is needed, possibly due to a mistaken assumption of the behavior ofreserve(...)
. This PR ensures that the minimum number of extra bytes needed for padding is reserved, avoiding unnecessarily large allocation.How Has This Been Tested?
Existing tests.