61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include "spn.h"
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int main(int argc, char const *argv[])
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{
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if (argc < 6) {
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printf("Usage: %s <key> <subst> <perm> <decoded> <coded>\n", argv[0]);
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return 1;
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}
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unsigned short key;
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unsigned char tempPerm[8], perm[8], tempSubst[16], subst[16];
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FILE* keyFile = fopen(argv[1], "r");
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if (fread(&key, 2, 1, keyFile) != 1) {
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printf("Unable to read key file\n");
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return 1;
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} else fclose(keyFile);
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FILE* substFile = fopen(argv[2], "r");
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if (fread(&tempSubst, 1, 16, substFile) != 16) {
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printf("Unable to read subst file\n");
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return 1;
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} else fclose(substFile);
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for (int i = 0; i < 16; i++) {
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subst[tempSubst[i]] = i;
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}
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FILE* permFile = fopen(argv[3], "r");
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if (fread(&tempPerm, 1, 8, permFile) != 8) {
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printf("Unable to read permutation file\n");
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return 1;
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} else fclose(permFile);
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for (int i = 0; i < 8; i++) {
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perm[tempPerm[i]] = i;
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}
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FILE* decoded = fopen(argv[4], "r");
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FILE* encoded = fopen(argv[5], "w");
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if (!decoded || !encoded) {
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printf("Unable to read/write content into files\n");
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return 1;
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}
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char w;
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while (fread(&w, 1, 1, decoded)) {
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w = decrypt(w, key, perm, subst);
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if (!fwrite(&w, 1, 1, encoded)) {
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printf("Error during writing\n");
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return 1;
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}
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}
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return 0;
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}
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