Algorithm flow A binary string to be processed is substituted for IP 2 key the PC1 replacement (64 into 56) 16 operation, the operation for the i-th round: 1) about the results of the last PC1 key (remove the first time, the others have been shifting processing) (28) rotate left one or two, and then will shift key PC2 [i] replacement. 2) is divided into the equal treatment string around two bunches of Li, Ri (32), and then expand the right string Ri E box (48-bit), the right string R R​ ​ and the previous step PC2 i] subkey XOR operation result is output via the S-box (48 to 32 conversion), and then directly through the P box replacement and XOR with Li. 3) the Ri to make Li, R is assigned to Ri. 4) merger deal with string StrText Ri = Li+. 4. Latest processing string IP_1 replacement, replacement results shall request string encryption or decryption string Encryption and decryption of difference In each round of operations, PC2 key e

DES.c

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