supercop

Basic CLI for supercop
git clone git://git.finwo.net/app/supercop
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common.c (2014B)

      1 #include "cli/common.h"
      2 
      3 #include <stdio.h>
      4 #include <stdlib.h>
      5 #include <string.h>
      6 
      7 #ifndef VERSION
      8 #define VERSION "n/a"
      9 #endif
     10 
     11 long fremaining(FILE *fd) {
     12   long current = ftell(fd);
     13   fseek(fd, 0, SEEK_END);
     14   long end = ftell(fd);
     15   fseek(fd, current, SEEK_SET);
     16   return end - current;
     17 }
     18 
     19 struct Format *supercop_find_format(const char *name) {
     20   struct Format *fmt = supercop_formats;
     21   if (!name) return NULL;
     22   while (fmt) {
     23     if (fmt->name && strcmp(fmt->name, name) == 0) return fmt;
     24     fmt = fmt->next;
     25   }
     26   return NULL;
     27 }
     28 
     29 struct KeyPair *readKeyFile(const char *filename) {
     30   struct Format *fmt = supercop_formats;
     31   FILE *fd = fopen(filename, "r");
     32   unsigned char *buf;
     33   struct KeyPair *kp;
     34 
     35   if (!fd) {
     36     fprintf(stderr, "Could not open key file\n");
     37     exit(1);
     38   }
     39 
     40   // Read whole file
     41   long fsize = fremaining(fd);
     42   buf = calloc(1, fsize + 1);
     43   fread(buf, 1, fsize, fd);
     44 
     45   // Auto-detect format
     46   while(fmt) {
     47     if (!fmt->detect(buf, fsize)) {
     48       fmt = fmt->next;
     49       continue;
     50     }
     51     kp = fmt->decode(buf, fsize);
     52     if (!kp) {
     53       fmt = fmt->next;
     54       continue;
     55     }
     56     free(buf);
     57     fclose(fd);
     58     return kp;
     59   }
     60 
     61   free(buf);
     62   fclose(fd);
     63   return NULL;
     64 }
     65 
     66 FILE *supercop_open_message(const char *message, const char *messageFile) {
     67   FILE *fmessage = stdin;
     68 
     69   if (message) {
     70     fmessage = tmpfile();
     71     fwrite(message, 1, strlen(message), fmessage);
     72     fseek(fmessage, 0, SEEK_SET);
     73   }
     74 
     75   if (messageFile) {
     76     if (message) fclose(fmessage);
     77     fmessage = fopen(messageFile, "r");
     78     if (!fmessage) {
     79       fprintf(stderr, "Could not open message file\n");
     80       exit(1);
     81     }
     82   }
     83 
     84   return fmessage;
     85 }
     86 
     87 FILE *supercop_parse_signature(const char *hex) {
     88   FILE *fsignature = tmpfile();
     89   const char *pos = hex;
     90   unsigned char c;
     91 
     92   while(*pos) {
     93     sscanf(pos, "%2hhx", &c);
     94     fputc(c, fsignature);
     95     pos += 2;
     96   }
     97   fseek(fsignature, 0, SEEK_SET);
     98 
     99   return fsignature;
    100 }
    101 
    102 void print_version(void) {
    103   fprintf(stdout, "%s\n", VERSION);
    104 }