
/*
 * Some demonstrations of using the Bitmanip permutation instructions
 * to perform useful cryptographic operations.
 * Examples re-produced from Claire's SVN repository:
 * - http://svn.clairexen.net/handicraft/2020/lut4perm/
 */


#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include "riscvcrypto/share/test.h"
#include "riscvcrypto/share/util.h"

#include "riscvcrypto/permutation/permutation.h"

// Show how we can implement the Prince Block Cipher sbox using xperm4
void demo_prince_sbox() {
    uint64_t sbox   = 0x4d5e087619ca23fb;
    uint64_t input  = 0xFEDCBA9876543210;
    uint64_t output = sbox_4bit(sbox, input);

    printf("# Prince SBox Demo\n");
    printf("prince_sbox    = %#018"PRIx64"\n", sbox     );
    printf("prince_input   = %#018"PRIx64"\n", input    );
    printf("prince_output  = %#018"PRIx64"\n", output   );
    printf("if(prince_output != prince_sbox):\n");
    printf("    exit(1)\n");
}

//! AES Forward SBox
static uint8_t aes_fwd_sbox[256] = {
  0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b,
  0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
  0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26,
  0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
  0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2,
  0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
  0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed,
  0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
  0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f,
  0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
  0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec,
  0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
  0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14,
  0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
  0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d,
  0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
  0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f,
  0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
  0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11,
  0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
  0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f,
  0xb0, 0x54, 0xbb, 0x16
};

// Show how to use the xperm8 instructions to implement the AES sbox.
void demo_aes_sbox() {

    printf("\n# AES SBox Demo\n");
    
    sbox_8bit_t sbox;
    pack_8bit_sbox(&sbox, aes_fwd_sbox);

    uint64_t input  = 0x01020304050607LL;
    uint64_t output = sbox_8bit(&sbox, input);

    // Check things
    for(int i = 0; i <8; i ++) {
        uint8_t in  = input >> (8*i);
        uint8_t out = output>> (8*i);
        uint8_t grm = aes_fwd_sbox[in];
        printf("# %08X %08X %08X\n",in,out,grm);
        if(out != grm) {
            printf("exit(1)\n");
        }
    }

}

int main(int argc, char ** argv) {

    demo_prince_sbox();

#if __riscv_xlen == 64
    demo_aes_sbox();
#endif

    return 0;

}
