CutPadKey cut key if key's length is greater than 'size', or pad key with space if key's length is smaller than 'size'.

NewPkcs5Padding returns a PKCS5 padding type structure.

NewPkcs7Padding returns a PKCS7 padding type structure.

Pkcs7Pad returns the byte array passed as a parameter padded with bytes such that the new byte array will be an exact multiple of the expected block size.

Pkcs7Unpad removes the padding of a given byte array, according to the same rules as described in the Pad function.

Padding interface defines functions Pad and Unpad implemented for PKCS #5 and PKCS #7 types of padding.

Padder struct embeds attributes necessary for the padding calculation (e.g.