It depends on the padding scheme.
E.g., PKCS#7 / RFC2630 pads with k bytes, all with value k. So you
decrypt the 32 bytes and look at the pad bytes. If the pad values are
16, the actual size is 16. If they're 15, the actual size is 17.
On 3/20/2012 12:04 AM, Nicle wrote:
And I have more question. For example, the actual file size is 16B, and
it will be encrypted to 32B.
Then, how does decrypt side know its actual size is 16B or 17B?
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