41 lines
1018 B
C
41 lines
1018 B
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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void read_array(const char* filename, unsigned char* array, int size) {
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FILE* f = fopen(filename, "r");
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for (int i = 0; i < size; i++) {
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fscanf(f, "%hhu", &array[i]);
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}
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fclose(f);
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}
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int main(int argc, char* argv[]) {
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if (argc != 6) {
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printf("%s <key_file> <subst_file> <perm_file> <input> <output>\n", argv[0]);
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return 1;
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}
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FILE* fkey = fopen(argv[1], "r");
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unsigned int key;
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fscanf(fkey, "%u", &key);
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fclose(fkey);
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unsigned char subst[16], perm[16];
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read_array(argv[2], subst, 16);
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read_array(argv[3], perm, 16);
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FILE* fin = fopen(argv[4], "rb");
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FILE* fout = fopen(argv[5], "wb");
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unsigned short block;
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while (fread(&block, 2, 1, fin)) {
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unsigned short dec = decrypt(block, key, perm, subst);
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fputc(dec >> 8, fout);
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fputc(dec & 0xFF, fout);
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}
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fclose(fin);
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fclose(fout);
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return 0;
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}
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