Ok,
I got it.
----------------------------------
The CFB mode also requires an integer parameter, denoted s, such that
1 ≤ s ≤ b. In the
specification of the CFB mode below, each plaintext segment (P#
j) and ciphertext segment (C#
j)
consists of s bits. The value of s is sometimes incorporated into the
name of the mode, e.g., the
1-bit CFB mode, the 8-bit CFB mode, the 64-bit CFB mode, or the 128-
bit CFB mode.
----------------------------------
Crypto++ has a protected method in modes.h:
void SetFeedbackSize(unsigned int feedbackSize)
{
if (feedbackSize > BlockSize())
throw InvalidArgument("CFB_Mode: invalid feedback
size");
m_feedbackSize = feedbackSize ? feedbackSize : BlockSize();
}
If I set m_feedbackSize to 1 (8-bit), Crypto++ produces the same
results as PHP/Python in CFB-Mode.
Is there a proper way to call this protected method from outside?
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