Merge pull request #413 from helibproject/master

Public Dev Sync-7 December 2020

Author: shaih

CHANGES.md

@@ -1,11 +1,20 @@
+HElib 1.3.1, December 2020
+=========================
+(tagged as v1.3.1)
+
+* Refactoring of CKKS Mitigation
+* Re-instated `Ctxt` isCorrect
+* Ctxt Conjugation fix
+* Added GMP and NTL alternative download locations
+
 HElib 1.3.0, December 2020
 =========================
 (tagged as v1.3.0)
 
 November-December 2020
 ---------------------
 * Mitigation for the CKKS vulnerability recently [observed](https://eprint.iacr.org/2020/1533.pdf) by Li and Micciancio
-* Context Builder unsing builder pattern
+* Context Builder using builder pattern
 * HElib now requires C++17
 
 HElib 1.2.0, November 2020

CMakeLists.txt

@@ -173,7 +173,7 @@ endif ()
 if (PACKAGE_BUILD)
   # Setting up dependencies versions
   # GMP version to be used (and eventually downloaded) if PACKAGE_BUILD
-  set(FETCHED_GMP_VERSION "6.2.0")
+  set(FETCHED_GMP_VERSION "6.2.1")
   # NTL version to be used (and eventually downloaded) if PACKAGE_BUILD
   set(FETCHED_NTL_VERSION "11.4.3")
   # Setting up default compilation output directory

benchmarks/CMakeLists.txt

@@ -47,7 +47,7 @@ endif (NOT CMAKE_BUILD_TYPE)
 set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
     "Debug" "RelWithDebInfo" "Release" "MinSizeRel")
 
-find_package(helib 1.3.0 EXACT REQUIRED)
+find_package(helib 1.3.1 EXACT REQUIRED)
 find_package(benchmark REQUIRED)
 
 # Targets are simply associated with their source files.

dependencies/gmp/CMakeLists.txt

@@ -26,9 +26,10 @@ ExternalProject_Add(
     gmp_fetched
     DEPENDS "setup_install_dir"
     URL "https://gmplib.org/download/gmp/gmp-${FETCHED_GMP_VERSION}.tar.bz2"
+        "https://ftp.gnu.org/gnu/gmp/gmp-${FETCHED_GMP_VERSION}.tar.bz2"
     URL_HASH
         # NOTE: hash of version 6.2.0
-        SHA256=f51c99cb114deb21a60075ffb494c1a210eb9d7cb729ed042ddb7de9534451ea
+        SHA256=eae9326beb4158c386e39a356818031bd28f3124cf915f8c5b1dc4c7a36b4d7c
     DOWNLOAD_NO_PROGRESS 1
     UPDATE_COMMAND ""
     CONFIGURE_COMMAND

dependencies/ntl/CMakeLists.txt

@@ -59,7 +59,8 @@ set(fetched_ntl_includedir
 ExternalProject_Add(
     ntl_fetched
     DEPENDS "${ntl_superbuild_dependencies}"
-    URL "https://www.shoup.net/ntl/ntl-${FETCHED_NTL_VERSION}.tar.gz"
+    URL "https://libntl.org/ntl-${FETCHED_NTL_VERSION}.tar.gz"
+        "https://www.shoup.net/ntl/ntl-${FETCHED_NTL_VERSION}.tar.gz"
     URL_HASH
         # NOTE: hash of version 11.4.3
         SHA256=b7c1ccdc64840e6a24351eb4a1e68887d29974f03073a1941c906562c0b83ad2

examples/CMakeLists.txt

@@ -31,7 +31,7 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
     "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}")
 
-find_package(helib 1.3.0 EXACT REQUIRED)
+find_package(helib 1.3.1 EXACT REQUIRED)
 
 add_subdirectory(BGV_binary_arithmetic)
 add_subdirectory(BGV_country_db_lookup)

include/helib/Ctxt.h

@@ -1184,22 +1184,8 @@ class Ctxt
     return true;
   }
 
-#if 0
-// VJS-NOTE: this is incorrectly defined, so I took it out
-// for now.  It is currently only used in a nonessential
-// way in Test_extractDigits.cpp and GTestExtractDigits.cpp,
-// and I commented out those usages.
-// For a correct implementation that takes into account
-// both the total noise bound and the relation between
-// relevant norms, see the code in SecKey::Decrypt.
-
   //! @brief Would this ciphertext be decrypted without errors?
-  bool isCorrect() const
-  {
-    NTL::ZZ q = context.productOfPrimes(primeSet);
-    return NTL::to_xdouble(q) > noiseBound * 2;
-  }
-#endif
+  bool isCorrect() const;
 
   const Context& getContext() const { return context; }
   const PubKey& getPubKey() const { return pubKey; }
@@ -1252,7 +1238,9 @@ class Ctxt
   // plaintext leakage attacks, as in the paper
   // "On the Security of Homomorphic Encryption on Approximate Numbers",
   // by Li and Micciancio.
-  void addNoiseForCKKSDecryption(const SecKey& sk, double eps);
+  void addedNoiseForCKKSDecryption(const SecKey& sk,
+                                   double eps,
+                                   NTL::ZZX& noise) const;
 };
 
 // set out=prod_{i=0}^{n-1} v[j], takes depth log n and n-1 products
@@ -1298,6 +1286,27 @@ inline Ctxt innerProduct(const std::vector<Ctxt>& v1,
   return ret;
 }
 
+//! frobeniusAutomorph: free function version of frobeniusAutomorph method
+inline void frobeniusAutomorph(Ctxt& ctxt, long j)
+{
+  ctxt.frobeniusAutomorph(j);
+}
+
+//! conjugate: free function that is equivalent to frobeniusAutomorph(ctxt, 1)
+inline void conjugate(Ctxt& ctxt) { frobeniusAutomorph(ctxt, 1); }
+
+//! Free functions to extract real and imaginary parts.
+//! Unlike the corresponding Ctxt method, extractImPart is thread safe.
+//! NOTES: (1) these will raise an error for BGV ciphertexts.
+void extractRealPart(Ctxt& c);
+void extractImPart(Ctxt& c);
+
+//! power: free function version of power method
+inline void power(Ctxt& ctxt, long e) { ctxt.power(e); }
+
+//! negate: free function version of negate method
+inline void negate(Ctxt& ctxt) { ctxt.negate(); }
+
 //! print to cerr some info about ciphertext
 void CheckCtxt(const Ctxt& c, const char* label);
 

include/helib/EncryptedArray.h

@@ -2116,6 +2116,9 @@ void frobeniusAutomorph(const EncryptedArray& ea,
                         PlaintextArray& pa,
                         const NTL::Vec<long>& vec);
 
+void extractRealPart(const EncryptedArray& ea, PlaintextArray& pa);
+void extractImPart(const EncryptedArray& ea, PlaintextArray& pa);
+
 void applyPerm(const EncryptedArray& ea,
                PlaintextArray& pa,
                const NTL::Vec<long>& pi);
@@ -2442,6 +2445,12 @@ inline void frobeniusAutomorph(PtxtArray& a, const NTL::Vec<long>& vec)
   frobeniusAutomorph(a.ea, a.pa, vec);
 }
 
+inline void conjugate(PtxtArray& a) { frobeniusAutomorph(a, 1); }
+
+inline void extractRealPart(PtxtArray& a) { extractRealPart(a.ea, a.pa); }
+
+inline void extractImPart(PtxtArray& a) { extractImPart(a.ea, a.pa); }
+
 inline void applyPerm(PtxtArray& a, const NTL::Vec<long>& pi)
 {
   applyPerm(a.ea, a.pa, pi);

misc/psi/CMakeLists.txt

@@ -11,7 +11,7 @@
 
 cmake_minimum_required(VERSION 3.10.2 FATAL_ERROR)
 
-## Use -std=c++14 as default.
+## Use -std=c++17 as default.
 set(CMAKE_CXX_STANDARD 17)
 ## Disable C++ extensions
 set(CMAKE_CXX_EXTENSIONS OFF)
@@ -31,7 +31,7 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
     "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}")
 
-  find_package(helib 1.3.0 EXACT REQUIRED)
+  find_package(helib 1.3.1 EXACT REQUIRED)
 
 add_subdirectory(scoring)
 add_subdirectory(lookup)

misc/psi/lookup/CMakeLists.txt

@@ -11,16 +11,16 @@
 
 cmake_minimum_required(VERSION 3.10.2 FATAL_ERROR)
 
-## Use -std=c++14 as default.
-set(CMAKE_CXX_STANDARD 14)
+## Use -std=c++17 as default.
+set(CMAKE_CXX_STANDARD 17)
 ## Disable C++ extensions
 set(CMAKE_CXX_EXTENSIONS OFF)
 ## Require full C++ standard
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 project(lookup LANGUAGES CXX)
 
-find_package(helib 1.1.0 EXACT REQUIRED)
+find_package(helib 1.3.1 EXACT REQUIRED)
 
 add_executable(lookup lookup.cpp)