desOfbEncrypt - 2025.2 English

#include "xf_security/ofb.hpp"

static void desOfbEncrypt (
    hls::stream <ap_uint <64>>& plaintextStrm,
    hls::stream <bool>& endPlaintextStrm,
    hls::stream <ap_uint <64>>& cipherkeyStrm,
    hls::stream <ap_uint <64>>& IVStrm,
    hls::stream <ap_uint <64>>& ciphertextStrm,
    hls::stream <bool>& endCiphertextStrm
    )

desOfbEncrypt is OFB encryption mode with DES single block cipher.

The algorithm reference is : “Recommendation for Block Cipher Modes of Operation - Methods and Techniques” The implementation is modified for better performance.

Parameters:

plaintextStrm	Input block stream text to be encrypted, each block is 64 bits.
endPlaintextStrm	End flag of block stream plaintext, 1 bit.
cipherkeyStrm	Input cipher key used in encryption, 64 bits for each key.
IVStrm	Initialization vector for the fisrt iteration of DES encrypition, 64 bits.
ciphertextStrm	Output encrypted block stream text, each block is 64 bits.
endCiphertextStrm	End flag of block stream ciphertext, 1 bit.