[Cryptography Team] isProperlyPadded

[Ron Teitelbaum]

Chris,

 

I ran into your padding methods which put the remainder size in each empty
space after the real data.

 

I have a problem with 

 

ByteArray>>unpaddedSize

            "If I was padded by a BlockCipher, answer the size of the
original plaintext."

            self isProperlyPadded ifFalse: [ CryptographyError signal:
'Authentication failure (improperly padded!)' ].

            ^ self size - self last

 

Since isProperlyPadded assumes that that was some padding the error seems
unnecessary.

 

Shouldn't this say: 

 

ByteArray>>unpaddedSize

            "If I was padded by a BlockCipher, answer the size of the
original plaintext."

            self isProperlyPadded ifFalse: [^self size].

            ^ self size - self last

 

 

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