コード例 #1
0
ファイル: test_ocb.cpp プロジェクト: evpo/EncryptPad
      Test::Result run_one_test(const std::string&, const VarMap& vars) override
         {
         const size_t keylen = vars.get_req_sz("Keylen");
         const size_t taglen = vars.get_req_sz("Taglen");
         const std::vector<uint8_t> expected = vars.get_req_bin("Output");

         // Test from RFC 7253 Appendix A

         const std::string algo = "AES-" + std::to_string(keylen);

         Test::Result result("OCB long");

         std::unique_ptr<Botan::BlockCipher> aes(Botan::BlockCipher::create(algo));
         if(!aes)
            {
            result.note_missing(algo);
            return result;
            }

         Botan::OCB_Encryption enc(aes->clone(), taglen / 8);
         Botan::OCB_Decryption dec(aes->clone(), taglen / 8);

         std::vector<uint8_t> key(keylen / 8);
         key[keylen / 8 - 1] = static_cast<uint8_t>(taglen);

         enc.set_key(key);
         dec.set_key(key);

         const std::vector<uint8_t> empty;
         std::vector<uint8_t> N(12);
         std::vector<uint8_t> C;

         for(size_t i = 0; i != 128; ++i)
            {
            const std::vector<uint8_t> S(i);

            Botan::store_be(static_cast<uint32_t>(3 * i + 1), &N[8]);

            ocb_encrypt(result, C, enc, dec, N, S, S);
            Botan::store_be(static_cast<uint32_t>(3 * i + 2), &N[8]);
            ocb_encrypt(result, C, enc, dec, N, S, empty);
            Botan::store_be(static_cast<uint32_t>(3 * i + 3), &N[8]);
            ocb_encrypt(result, C, enc, dec, N, empty, S);
            }

         Botan::store_be(static_cast<uint32_t>(385), &N[8]);
         std::vector<uint8_t> final_result;
         ocb_encrypt(result, final_result, enc, dec, N, empty, C);

         result.test_eq("correct value", final_result, expected);

         return result;
         }
コード例 #2
0
ファイル: CryptState.cpp プロジェクト: Acidburn0zzz/mumble
void CryptState::encrypt(const unsigned char *source, unsigned char *dst, unsigned int plain_length) {
	unsigned char tag[AES_BLOCK_SIZE];

	// First, increase our IV.
	for (int i=0;i<AES_BLOCK_SIZE;i++)
		if (++encrypt_iv[i])
			break;

	ocb_encrypt(source, dst+4, plain_length, encrypt_iv, tag);

	dst[0] = encrypt_iv[0];
	dst[1] = tag[0];
	dst[2] = tag[1];
	dst[3] = tag[2];
}
コード例 #3
0
int ocb_encrypt_authenticate_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  
    const unsigned char *pt,     unsigned long ptlen,
          unsigned char *ct,
          unsigned char *tag,    unsigned long *taglen)
{
   int err;
   ocb_state *ocb;

   LTC_ARGCHK(key    != NULL);
   LTC_ARGCHK(nonce  != NULL);
   LTC_ARGCHK(pt     != NULL);
   LTC_ARGCHK(ct     != NULL);
   LTC_ARGCHK(tag    != NULL);
   LTC_ARGCHK(taglen != NULL);

   /* allocate ram */
   ocb = XMALLOC(sizeof(ocb_state));
   if (ocb == NULL) {
      return CRYPT_MEM;
   }

   if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
      goto LBL_ERR;
   }

   while (ptlen > (unsigned long)ocb->block_len) {
        if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) {
           goto LBL_ERR;
        }
        ptlen   -= ocb->block_len;
        pt      += ocb->block_len;
        ct      += ocb->block_len;
   }

   err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
   zeromem(ocb, sizeof(ocb_state));
#endif

   XFREE(ocb);

   return err;
}
コード例 #4
0
ファイル: test_ocb.cpp プロジェクト: evpo/EncryptPad
      Test::Result run_one_test(const std::string& algo, const VarMap& vars) override
         {
         Test::Result result("OCB wide block long test");

         const std::vector<uint8_t> expected = vars.get_req_bin("Output");

         std::unique_ptr<Botan::BlockCipher> cipher;
         size_t bs = 0;

         if(algo == "SHACAL2")
            {
#if defined(BOTAN_HAS_SHACAL2)
            cipher = Botan::BlockCipher::create_or_throw("SHACAL2");
            bs = 32;
#else
            return {result};
#endif
            }
         else
            {
            if(algo == "Toy128")
               bs = 16;
            else if(algo == "Toy192")
               bs = 24;
            else if(algo == "Toy256")
               bs = 32;
            else if(algo == "Toy512")
               bs = 64;
            else
               throw Test_Error("Unknown cipher for OCB wide block long test");
            cipher.reset(new OCB_Wide_Test_Block_Cipher(bs));
            }

         Botan::OCB_Encryption enc(cipher.release(), std::min<size_t>(bs, 32));

         /*
         Y, string of length min(B, 256) bits

         Y is defined as follows.

         K = (0xA0 || 0xA1 || 0xA2 || ...)[1..B]
         C = <empty string>
         for i = 0 to 127 do
           S = (0x50 || 0x51 || 0x52 || ...)[1..8i]
           N = num2str(3i+1,16)
           C = C || OCB-ENCRYPT(K,N,S,S)
           N = num2str(3i+2,16)
           C = C || OCB-ENCRYPT(K,N,<empty string>,S)
           N = num2str(3i+3,16)
           C = C || OCB-ENCRYPT(K,N,S,<empty string>)
         end for
         N = num2str(385,16)
         Y = OCB-ENCRYPT(K,N,C,<empty string>)
         */

         std::vector<uint8_t> key(bs);
         for(size_t i = 0; i != bs; ++i)
            key[i] = 0xA0 + i;

         enc.set_key(key);

         const std::vector<uint8_t> empty;
         std::vector<uint8_t> N(2);
         std::vector<uint8_t> C;

         for(size_t i = 0; i != 128; ++i)
            {
            std::vector<uint8_t> S(i);
            for(size_t j = 0; j != S.size(); ++j)
               S[j] = 0x50 + j;

            Botan::store_be(static_cast<uint16_t>(3 * i + 1), &N[0]);

            ocb_encrypt(result, C, enc, N, S, S);
            Botan::store_be(static_cast<uint16_t>(3 * i + 2), &N[0]);
            ocb_encrypt(result, C, enc, N, S, empty);
            Botan::store_be(static_cast<uint16_t>(3 * i + 3), &N[0]);
            ocb_encrypt(result, C, enc, N, empty, S);
            }

         Botan::store_be(static_cast<uint16_t>(385), &N[0]);
         std::vector<uint8_t> final_result;
         ocb_encrypt(result, final_result, enc, N, empty, C);

         result.test_eq("correct value", final_result, expected);

         return result;
         }