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Ekko.bao
2025-05-03 16:24:47 +08:00
parent 56f7490d00
commit cfb9d12f3c
692 changed files with 37004 additions and 1 deletions
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31
lib/playfair/playfair.c Normal file
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#include <stdint.h>
#include "playfair.h"
void generate_key_schedule(unsigned char* key_material, uint32_t key_schedule[11][4]);
void generate_session_key(unsigned char* oldSap, unsigned char* messageIn, unsigned char* sessionKey);
void cycle(unsigned char* block, uint32_t key_schedule[11][4]);
void z_xor(unsigned char* in, unsigned char* out, int blocks);
void x_xor(unsigned char* in, unsigned char* out, int blocks);
extern unsigned char default_sap[];
void playfair_decrypt(unsigned char* message3, unsigned char* cipherText, unsigned char* keyOut)
{
unsigned char* chunk1 = &cipherText[16];
unsigned char* chunk2 = &cipherText[56];
int i;
unsigned char blockIn[16];
unsigned char sapKey[16];
uint32_t key_schedule[11][4];
generate_session_key(default_sap, message3, sapKey);
generate_key_schedule(sapKey, key_schedule);
z_xor(chunk2, blockIn, 1);
cycle(blockIn, key_schedule);
for (i = 0; i < 16; i++) {
keyOut[i] = blockIn[i] ^ chunk1[i];
}
x_xor(keyOut, keyOut, 1);
z_xor(keyOut, keyOut, 1);
}