src/common/crypto_format.c

   1 /* Copyright (c) 2012-2013, The Tor Project, Inc. */
   2 /* See LICENSE for licensing information */
   3
   4 /* Formatting and parsing code for crypto-related data structures. */
   5
   6 #include "orconfig.h"
   7 #ifdef HAVE_SYS_STAT_H
   8 #include <sys/stat.h>
   9 #endif
  10 #include "crypto.h"
  11 #include "crypto_curve25519.h"
  12 #include "util.h"
  13 #include "torlog.h"
  14
  15 int
  16 curve25519_public_to_base64(char *output,
  17                             const curve25519_public_key_t *pkey)
  18 {
  19   char buf[128];
  20   base64_encode(buf, sizeof(buf),
  21                 (const char*)pkey->public_key, CURVE25519_PUBKEY_LEN);
  22   buf[CURVE25519_BASE64_PADDED_LEN] = '\0';
  23   memcpy(output, buf, CURVE25519_BASE64_PADDED_LEN+1);
  24   return 0;
  25 }
  26
  27 int
  28 curve25519_public_from_base64(curve25519_public_key_t *pkey,
  29                               const char *input)
  30 {
  31   size_t len = strlen(input);
  32   if (len == CURVE25519_BASE64_PADDED_LEN - 1) {
  33     /* not padded */
  34     return digest256_from_base64((char*)pkey->public_key, input);
  35   } else if (len == CURVE25519_BASE64_PADDED_LEN) {
  36     char buf[128];
  37     if (base64_decode(buf, sizeof(buf), input, len) != CURVE25519_PUBKEY_LEN)
  38       return -1;
  39     memcpy(pkey->public_key, buf, CURVE25519_PUBKEY_LEN);
  40     return 0;
  41   } else {
  42     return -1;
  43   }
  44 }
  45