![]() ![]() The inverse affine transformation is as follows: It is calculated by first calculating the inverse affine transformation of the input value, followed by the multiplicative inverse. For example, the inverse S-box of 0xdb is 0x9f. ![]() The inverse S-box is simply the S-box run in reverse. Note that the multiplicative inverse of 0x00 is defined as itself.įor C,C++ here is the initialization of the table: For example, the value 0x9a is converted in to 0xb8 by Rijndael's S-box. Here the column is determined by the least significant nibble, and the row is determined by the most significant nibble. This will generate the following S-box, which is represented here with hexadecimal notation:
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