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view libtomcrypt/src/encauth/ccm/ccm_test.c @ 1790:42745af83b7d

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Introduce extra delay before closing unauthenticated sessions To make it harder for attackers, introduce a delay to keep an unauthenticated session open a bit longer, thus blocking a connection slot until after the delay. Without this, while there is a limit on the amount of attempts an attacker can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to handle one attempt is still short and thus for each of the allowed parallel attempts many attempts can be chained one after the other. The attempt rate is then: "MAX_UNAUTH_PER_IP / <process time of one attempt>". With the delay, this rate becomes: "MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
date Wed, 15 Feb 2017 13:53:04 +0100
parents 6dba84798cd5
children
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include "tomcrypt.h"

/**
  @file ccm_test.c
  CCM support, process a block of memory, Tom St Denis
*/

#ifdef LTC_CCM_MODE

int ccm_test(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   static const struct {
       unsigned char key[16];
       unsigned char nonce[16];
       int           noncelen;
       unsigned char header[64];
       int           headerlen;
       unsigned char pt[64];
       int           ptlen;
       unsigned char ct[64];
       unsigned char tag[16];
       unsigned long taglen;
   } tests[] = {

/* 13 byte nonce, 8 byte auth, 23 byte pt */
{
   { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
     0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF },
   { 0x00, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, 0xA0,
     0xA1, 0xA2, 0xA3, 0xA4, 0xA5 },
   13,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 },
   8,
   { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E },
   23,
   { 0x58, 0x8C, 0x97, 0x9A, 0x61, 0xC6, 0x63, 0xD2,
     0xF0, 0x66, 0xD0, 0xC2, 0xC0, 0xF9, 0x89, 0x80,
     0x6D, 0x5F, 0x6B, 0x61, 0xDA, 0xC3, 0x84 },
   { 0x17, 0xe8, 0xd1, 0x2c, 0xfd, 0xf9, 0x26, 0xe0 },
   8
},

/* 13 byte nonce, 12 byte header, 19 byte pt */
{
   { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
     0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF },
   { 0x00, 0x00, 0x00, 0x06, 0x05, 0x04, 0x03, 0xA0,
     0xA1, 0xA2, 0xA3, 0xA4, 0xA5 },
   13,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B },
   12,
   { 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13,
     0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
     0x1C, 0x1D, 0x1E },
   19,
   { 0xA2, 0x8C, 0x68, 0x65, 0x93, 0x9A, 0x9A, 0x79,
     0xFA, 0xAA, 0x5C, 0x4C, 0x2A, 0x9D, 0x4A, 0x91,
     0xCD, 0xAC, 0x8C },
   { 0x96, 0xC8, 0x61, 0xB9, 0xC9, 0xE6, 0x1E, 0xF1 },
   8
},

/* supplied by Brian Gladman */
{
   { 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f },
   { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16  },
   7,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 },
   8,
   { 0x20, 0x21, 0x22, 0x23 },
   4,
   { 0x71, 0x62, 0x01, 0x5b },
   { 0x4d, 0xac, 0x25, 0x5d },
   4
},

{
   { 0xc9, 0x7c, 0x1f, 0x67, 0xce, 0x37, 0x11, 0x85,
     0x51, 0x4a, 0x8a, 0x19, 0xf2, 0xbd, 0xd5, 0x2f },
   { 0x00, 0x50, 0x30, 0xf1, 0x84, 0x44, 0x08, 0xb5,
     0x03, 0x97, 0x76, 0xe7, 0x0c },
   13,
   { 0x08, 0x40, 0x0f, 0xd2, 0xe1, 0x28, 0xa5, 0x7c,
     0x50, 0x30, 0xf1, 0x84, 0x44, 0x08, 0xab, 0xae,
     0xa5, 0xb8, 0xfc, 0xba, 0x00, 0x00 },
   22,
   { 0xf8, 0xba, 0x1a, 0x55, 0xd0, 0x2f, 0x85, 0xae,
     0x96, 0x7b, 0xb6, 0x2f, 0xb6, 0xcd, 0xa8, 0xeb,
     0x7e, 0x78, 0xa0, 0x50 },
   20,
   { 0xf3, 0xd0, 0xa2, 0xfe, 0x9a, 0x3d, 0xbf, 0x23,
     0x42, 0xa6, 0x43, 0xe4, 0x32, 0x46, 0xe8, 0x0c,
     0x3c, 0x04, 0xd0, 0x19 },
   { 0x78, 0x45, 0xce, 0x0b, 0x16, 0xf9, 0x76, 0x23 },
   8
},

};
  unsigned long taglen, x, y;
  unsigned char buf[64], buf2[64], tag[16], tag2[16], tag3[16], zero[64];
  int           err, idx;
  symmetric_key skey;
  ccm_state ccm;

  zeromem(zero, 64);

  idx = find_cipher("aes");
  if (idx == -1) {
     idx = find_cipher("rijndael");
     if (idx == -1) {
        return CRYPT_NOP;
     }
  }

  for (x = 0; x < (sizeof(tests)/sizeof(tests[0])); x++) {
    for (y = 0; y < 2; y++) {
      taglen = tests[x].taglen;
      if (y == 0) {
         if ((err = cipher_descriptor[idx].setup(tests[x].key, 16, 0, &skey)) != CRYPT_OK) {
            return err;
         }

         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               &skey,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               (unsigned char*)tests[x].pt, tests[x].ptlen,
                               buf,
                               tag, &taglen, 0)) != CRYPT_OK) {
            return err;
         }
         /* run a second time to make sure skey is not touched */
         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               &skey,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               (unsigned char*)tests[x].pt, tests[x].ptlen,
                               buf,
                               tag, &taglen, 0)) != CRYPT_OK) {
            return err;
         }
      } else {
         if ((err = ccm_init(&ccm, idx, tests[x].key, 16, tests[x].ptlen, tests[x].taglen, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_nonce(&ccm, tests[x].nonce, tests[x].noncelen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_aad(&ccm, tests[x].header, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_process(&ccm, (unsigned char*)tests[x].pt, tests[x].ptlen, buf, CCM_ENCRYPT)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_done(&ccm, tag, &taglen)) != CRYPT_OK) {
            return err;
         }
      }

      if (compare_testvector(buf, tests[x].ptlen, tests[x].ct, tests[x].ptlen, "CCM encrypt data", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }
      if (compare_testvector(tag, taglen, tests[x].tag, tests[x].taglen, "CCM encrypt tag", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }

      if (y == 0) {
         XMEMCPY(tag3, tests[x].tag, tests[x].taglen);
         taglen = tests[x].taglen;
         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               NULL,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               buf2, tests[x].ptlen,
                               buf,
                               tag3, &taglen, 1   )) != CRYPT_OK) {
            return err;
         }
      } else {
         if ((err = ccm_init(&ccm, idx, tests[x].key, 16, tests[x].ptlen, tests[x].taglen, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_nonce(&ccm, tests[x].nonce, tests[x].noncelen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_aad(&ccm, tests[x].header, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_process(&ccm, buf2, tests[x].ptlen, buf, CCM_DECRYPT)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_done(&ccm, tag2, &taglen)) != CRYPT_OK) {
            return err;
         }
      }


      if (compare_testvector(buf2, tests[x].ptlen, tests[x].pt, tests[x].ptlen, "CCM decrypt data", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }
      if (y == 0) {
        /* check if decryption with the wrong tag does not reveal the plaintext */
        XMEMCPY(tag3, tests[x].tag, tests[x].taglen);
        tag3[0] ^= 0xff; /* set the tag to the wrong value */
        taglen = tests[x].taglen;
        if ((err = ccm_memory(idx,
                              tests[x].key, 16,
                              NULL,
                              tests[x].nonce, tests[x].noncelen,
                              tests[x].header, tests[x].headerlen,
                              buf2, tests[x].ptlen,
                              buf,
                              tag3, &taglen, 1   )) != CRYPT_ERROR) {
          return CRYPT_FAIL_TESTVECTOR;
        }
        if (compare_testvector(buf2, tests[x].ptlen, zero, tests[x].ptlen, "CCM decrypt wrong tag", x)) {
           return CRYPT_FAIL_TESTVECTOR;
        }
      } else {
        if (compare_testvector(tag2, taglen, tests[x].tag, tests[x].taglen, "CCM decrypt tag", x)) {
           return CRYPT_FAIL_TESTVECTOR;
        }
      }

      if (y == 0) {
         cipher_descriptor[idx].done(&skey);
      }
    }
  }

  return CRYPT_OK;
#endif
}

#endif

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