Hi,

I performed the test (http://csrc.nist.gov/publications/nistpubs/
800-38a/sp800-38a.pdf). The reason for the different results seems to
be, that the CFB mode has 4 different sub-modes, the 1-bit CFB mode,
the 8-bit CFB mode, the 64-bit CFB mode, or the 128-bit CFB mode. The
PHP script seems to use the 8-bit CFB mode, while Crypto++ uses the
128-bit CFB mode.

Is there a possibility to run Crypto++ with 8-bit CFB mode?

Best regards,
Stephen


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