From 261a665b1be34f07d5012eed5f6090fd85dd8479 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Thu, 14 Mar 2013 18:02:26 +0000
Subject: Add OCB mode, currently encrypt only, and an AEAD interface

---
 checks/bench.cpp    |   1 +
 checks/ocb.cpp      | 148 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 checks/validate.cpp |   2 +
 checks/validate.h   |   2 +
 4 files changed, 153 insertions(+)
 create mode 100644 checks/ocb.cpp

(limited to 'checks')

diff --git a/checks/bench.cpp b/checks/bench.cpp
index 5faba00db..4e6f15fb6 100644
--- a/checks/bench.cpp
+++ b/checks/bench.cpp
@@ -76,6 +76,7 @@ const std::string algos[] = {
    "AES-128/CBC/CTS",
    "AES-128/CTR-BE",
    "AES-128/EAX",
+   "AES-128/OCB",
    "AES-128/OFB",
    "AES-128/XTS",
    "AES-128/CFB(128)",
diff --git a/checks/ocb.cpp b/checks/ocb.cpp
new file mode 100644
index 000000000..b45b6d2b8
--- /dev/null
+++ b/checks/ocb.cpp
@@ -0,0 +1,148 @@
+
+#include "validate.h"
+
+#include <botan/pipe.h>
+#include <botan/ocb.h>
+#include <botan/hex.h>
+#include <botan/sha2_32.h>
+#include <botan/aes.h>
+#include <iostream>
+//#include <botan/selftest.h>
+
+using namespace Botan;
+
+// something like this should be in the library
+std::vector<byte> ocb_encrypt(const SymmetricKey& key,
+                              const std::vector<byte>& nonce,
+                              const byte pt[], size_t pt_len,
+                              const byte ad[], size_t ad_len)
+   {
+   //std::unique_ptr<AEAD_Mode> ocb = get_aead("AES-128/OCB", ENCRYPTION);
+
+   OCB_Encryption* ocb = new OCB_Encryption(new AES_128);
+
+   ocb->set_key(key);
+   ocb->set_nonce(&nonce[0], nonce.size());
+   ocb->set_associated_data(ad, ad_len);
+
+   Pipe pipe(ocb);
+   pipe.process_msg(pt, pt_len);
+   return unlock(pipe.read_all());
+   }
+
+std::vector<byte> ocb_decrypt(const SymmetricKey& key,
+                              const std::vector<byte>& nonce,
+                              const byte pt[], size_t pt_len,
+                              const byte ad[], size_t ad_len)
+   {
+   throw std::runtime_error("Not implemented");
+
+#if 0
+   OCB_Decryption* ocb = new OCB_Decryption(new AES_128);
+
+   ocb->set_key(key);
+   ocb->set_nonce(&nonce[0], nonce.size());
+   ocb->set_associated_data(ad, ad_len);
+
+   Pipe pipe(ocb);
+   pipe.process_msg(pt, pt_len);
+   return pipe.read_all_unlocked();
+#endif
+   }
+
+template<typename Alloc, typename Alloc2>
+std::vector<byte> ocb_encrypt(const SymmetricKey& key,
+                              const std::vector<byte>& nonce,
+                              const std::vector<byte, Alloc>& pt,
+                              const std::vector<byte, Alloc2>& ad)
+   {
+   return ocb_encrypt(key, nonce, &pt[0], pt.size(), &ad[0], ad.size());
+   }
+
+
+void test_ocb_long()
+   {
+   SymmetricKey key("00000000000000000000000000000000");
+
+   const std::vector<byte> empty;
+   std::vector<byte> N(12);
+   std::vector<byte> C;
+
+   for(size_t i = 0; i != 128; ++i)
+      {
+      const std::vector<byte> S(i);
+      N[11] = i;
+
+      const std::vector<byte> C1 = ocb_encrypt(key, N, S, S);
+      const std::vector<byte> C2 = ocb_encrypt(key, N, S, empty);
+      const std::vector<byte> C3 = ocb_encrypt(key, N, empty, S);
+
+      //std::cout << "C_" << i << " = " << hex_encode(C1) << " " << hex_encode(C2) << " " << hex_encode(C3) << "\n";
+
+      C += C1;
+      C += C2;
+      C += C3;
+
+      SHA_256 sha256;
+      sha256.update(C);
+      //std::cout << "SHA-256(C_" << i << ") = " << hex_encode(sha256.final()) << "\n";
+      }
+
+   // SHA-256 hash of C would be useful
+
+   SHA_256 sha256;
+   sha256.update(C);
+   const std::string C_hash = hex_encode(sha256.final());
+   const std::string expected_C_hash = "C4E5158067F49356042296B13B050DE00A120EA846073E5E0DACFD0C9F43CC65";
+
+   if(C_hash != expected_C_hash)
+      {
+      std::cout << "OCB-128 long test, C hashes differ\n";
+      std::cout << C_hash << " !=\n" << expected_C_hash << "\n";
+      }
+
+   //std::cout << "SHA-256(C) = " << C_hash << "\n";
+
+   N[11] = 0;
+   const std::vector<byte> cipher = ocb_encrypt(key, N, empty, C);
+
+   const std::string expected = "B2B41CBF9B05037DA7F16C24A35C1C94";
+
+   const std::string cipher_hex = hex_encode(cipher);
+
+   if(cipher_hex != expected)
+      std::cout << "OCB AES-128 long test mistmatch " << cipher_hex << " != " << expected << "\n";
+   else
+      std::cout << "OCB AES-128 long test OK\n";
+   }
+
+void test_ocb()
+   {
+   SymmetricKey key("000102030405060708090A0B0C0D0E0F");
+
+   std::vector<byte> nonce = hex_decode("000102030405060708090A0B");
+
+   std::vector<byte> pt = hex_decode("000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F2021222324252627");
+   std::vector<byte> ad = hex_decode("000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F2021222324252627");
+
+   const std::string expected = "BEA5E8798DBE7110031C144DA0B26122CEAAB9B05DF771A657149D53773463CB68C65778B058A635659C623211DEEA0DE30D2C381879F4C8";
+
+   std::vector<byte> ctext = ocb_encrypt(key, nonce, pt, ad);
+
+   std::string ctext_hex = hex_encode(ctext);
+
+   if(ctext_hex != expected)
+      std::cout << "OCB/AES-128 encrypt test failure\n" << ctext_hex << " !=\n" << expected << "\n";
+   else
+      std::cout << "OCB/AES-128 encrypt OK\n";
+
+#if 0
+   std::vector<byte> dec = ocb_decrypt(key, nonce, ctext, ad);
+
+   std::cout << hex_encode(dec) << "\n";
+#endif
+
+   test_ocb_long();
+   }
+
+
diff --git a/checks/validate.cpp b/checks/validate.cpp
index 48bc6bd87..55af920cd 100644
--- a/checks/validate.cpp
+++ b/checks/validate.cpp
@@ -416,6 +416,8 @@ u32bit do_validation_tests(const std::string& filename,
       errors++;
       }
 
+   test_ocb();
+
    return errors;
    }
 
diff --git a/checks/validate.h b/checks/validate.h
index b88837d4b..539154d53 100644
--- a/checks/validate.h
+++ b/checks/validate.h
@@ -30,4 +30,6 @@ void do_x509_tests(RandomNumberGenerator&);
 
 size_t do_tls_tests(RandomNumberGenerator& rng);
 
+void test_ocb();
+
 #endif
-- 
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