Squashed 'src/secp256k1/' changes from 44c2452fd3..19262492ef

19262492ef Add doc/ellswift.md with ElligatorSwift explanation f3b0b08a19 Add ellswift testing to CI 7d852dd6a5 Add ElligatorSwift ctime tests f3a25cd7bc Add tests for ElligatorSwift 30b99876a4 Add ElligatorSwift benchmarks d2d47485a5 Add ellswift module implementing ElligatorSwift 4116a67dea Add functions to test if X coordinate is valid a5eb1a0fe9 Add benchmark for key generation 2e5a8dffed Add x-only ecmult_const version for x=n/d e65551e389 doc: Describe Jacobi calculation in safegcd_implementation.md bb146e5096 Native jacobi symbol algorithm 62eb12379c Make secp256k1_modinv64_det_check_pow2 support abs val 3a58861f0e Make secp256k1_i128_check_pow2 support -(2^n) 01b819a8c7 Merge bitcoin-core/secp256k1#1158: Add a secp256k1_i128_to_u64 function. eacad90f69 Merge bitcoin-core/secp256k1#1171: Change ARG_CHECK_NO_RETURN to ARG_CHECK_VOID which returns (void) 3f57b9f774 Merge bitcoin-core/secp256k1#1177: Some improvements to the changelog c30b889f17 Clarify that the ABI-incompatible versions are earlier 881fc33d0c Consistency in naming of modules 665ba77e79 Merge bitcoin-core/secp256k1#1178: Drop `src/libsecp256k1-config.h` 75d7b7f5ba Merge bitcoin-core/secp256k1#1154: ci: set -u in cirrus.sh to treat unset variables as an error 7a74688201 ci: add missing CFLAGS & CPPFLAGS variable to print_environment c2e0fdadeb ci: set -u in cirrus.sh to treat unset variables as an error 9c5a4d21bb Do not define unused `HAVE_VALGRIND` macro ad8647f548 Drop no longer relevant files from `.gitignore` b627ba7050 Remove dependency on `src/libsecp256k1-config.h` 9ecf8149a1 Reduce font size in changelog 2dc133a67f Add more changelog entries ac233e181a Add links to diffs to changelog cee8223ef6 Mention semantic versioning in changelog 9a8d65f07f Merge bitcoin-core/secp256k1#1174: release cleanup: bump version after 0.2.0 02ebc290f7 release cleanup: bump version after 0.2.0 b6b360efaf doc: improve message of cleanup commit 21ffe4b22a Merge bitcoin-core/secp256k1#1055: Prepare initial release e025ccdf74 release: prepare for initial release 0.2.0 6d1784a2e2 build: add missing files to EXTRA_DIST 8c949f56da Merge bitcoin-core/secp256k1#1173: Don't use compute credits for now 13bf1b6b32 changelog: make order of change types match keepachangelog.com b1f992a552 doc: improve release process 7e5b22684f Don't use compute credits for now a49e0940ad docs: Fix typo 2551cdac90 tests: Fix code formatting c635c1bfd5 Change ARG_CHECK_NO_RETURN to ARG_CHECK_VOID which returns (void) cf66f2357c refactor: Add helper function secp256k1_context_is_proper() ad39e2dc41 build: change package version to 0.1.0-dev 5c789dcd73 Merge bitcoin-core/secp256k1#1168: Replace deprecated context flags with NONE in benchmarks and tests d6dc0f4ae3 tests: Switch to NONE contexts in module tests 0c8a5caddd tests: Switch to NONE contexts in tests.c 86540e9e1f tests: add test for deprecated flags and rm them from run_context caa0ad631e group: add gej_eq_var 37ba744f5b tests: Switch to NONE contexts in exhaustive and ctime tests 8d7a9a8eda benchmarks: Switch to NONE contexts 90618e9263 doc: move CHANGELOG from doc/ to root directory e3f84777eb Merge bitcoin-core/secp256k1#1126: API cleanup with respect to contexts 4386a2306c examples: Switch to NONE contexts 7289b51d31 docs: Use doxygen style if and only if comment is user-facing e7d0185c90 docs: Get rid of "initialized for signing" terminology 06126364ad docs: Tidy and improve docs about contexts and randomization e02d6862bd selftest: Expose in public API e383fbfa66 selftest: Rename internal function to make name available for API d2c6d48de3 tests: Use new name of static context 53796d2b24 contexts: Rename static context 72fedf8a6c docs: Improve docs for static context 316ac7625a contexts: Deprecate all context flags except SECP256K1_CONTEXT_NONE 477f02c4de Merge bitcoin-core/secp256k1#1165: gitignore: Add *.sage.py files autogenerated by sage [skip ci] 092be61c5e gitignore: Add *.sage.py files autogenerated by sage 1a553ee8be docs: Change signature "validation" to "verification" ee7341fbac docs: Never require a verification context 751c4354d5 Merge bitcoin-core/secp256k1#1152: Update macOS image for CI 2286f80902 Merge bitcoin-core/secp256k1#993: Enable non-experimental modules by default d216475205 test secp256k1_i128_to_i64 4bc429019d Add a secp256k1_i128_to_u64 function. e40fd277b7 Merge bitcoin-core/secp256k1#1156: Followups to int128_struct arithmetic 99bd335599 Make int128 overflow test use secp256k1_[ui]128_mul a8494b02bf Use compute credits for macOS jobs 3afce0af7c Avoid signed overflow in MSVC AMR64 secp256k1_mul128 c0ae48c995 Update macOS image for CI 9b5f589d30 Heuristically decide whether to use int128_struct 63ff064d2f int128: Add test override for testing __(u)mulh on MSVC X64 f2b7e88768 Add int128 randomized tests 6138d73be4 Merge bitcoin-core/secp256k1#1155: Add MSan CI jobs ddf2b2910e Merge bitcoin-core/secp256k1#1000: Synthetic int128 type. 86e3b38a4a Merge bitcoin-core/secp256k1#1149: Remove usage of CHECK from non-test file 00a42b91b3 Add MSan CI job 44916ae915 Merge bitcoin-core/secp256k1#1147: ci: print env to allow reproducing the job outside of CI c2ee9175e9 Merge bitcoin-core/secp256k1#1146: ci: prevent "-v/--version: not found" irrelevant error e13fae487e Merge bitcoin-core/secp256k1#1150: ci: always cat test_env.log a340d9500a ci: add int128_struct tests dceaa1f579 int128: Tidy #includes of int128.h and int128_impl.h 2914bccbc0 Simulated int128 type. 6a965b6b98 Remove usage of CHECK from non-test file 5c9f1a5c37 ci: always cat all logs_snippets 49ae843592 ci: mostly prevent "-v/--version: not found" irrelevant error 4e54c03153 ci: print env to allow reproducing the job outside of CI a43e982bca Merge bitcoin-core/secp256k1#1144: Cleanup `.gitignore` file f5039cb66c Cleanup `.gitignore` file 798727ae1e Revert "Add test logs to gitignore" 41e8704b48 build: Enable some modules by default 694ce8fb2d Merge bitcoin-core/secp256k1#1131: readme: Misc improvements 88b00897e7 readme: Fix line break 78f5296da4 readme: Sell "no runtime dependencies" ef48f088ad readme: Add IRC channel 9f8a13dc8e Merge bitcoin-core/secp256k1#1128: configure: Remove pkgconfig macros again (reintroduced by mismerge) cabe085bb4 configure: Remove pkgconfig macros again (reintroduced by mismerge) 3efeb9da21 Merge bitcoin-core/secp256k1#1121: config: Set preprocessor defaults for ECMULT_* config values 6a873cc4a9 Merge bitcoin-core/secp256k1#1122: tests: Randomize the context with probability 15/16 instead of 1/4 17065f48ae tests: Randomize the context with probability 15/16 instead of 1/4 c27ae45144 config: Remove basic-config.h da6514a04a config: Introduce DEBUG_CONFIG macro for debug output of config 63a3565e97 Merge bitcoin-core/secp256k1#1120: ecmult_gen: Skip RNG when creating blinding if no seed is available d0cf55e13a config: Set preprocessor defaults for ECMULT_* config values 55f8bc99dc ecmult_gen: Improve comments about projective blinding 7a86955800 ecmult_gen: Simplify code (no observable change) 4cc0b1b669 ecmult_gen: Skip RNG when creating blinding if no seed is available af65d30cc8 Merge bitcoin-core/secp256k1#1116: build: Fix #include "..." paths to get rid of further -I arguments 40a3473a9d build: Fix #include "..." paths to get rid of further -I arguments 43756da819 Merge bitcoin-core/secp256k1#1115: Fix sepc256k1 -> secp256k1 typo in group.h 069aba8125 Fix sepc256k1 -> secp256k1 typo in group.h accadc94df Merge bitcoin-core/secp256k1#1114: `_scratch_destroy`: move `VERIFY_CHECK` after invalid scrach space check cd47033335 Merge bitcoin-core/secp256k1#1084: ci: Add MSVC builds 1827c9bf2b scratch_destroy: move VERIFY_CHECK after invalid scrach space check 49e2acd927 configure: Improve rationale for WERROR_CFLAGS 8dc4b03341 ci: Add a C++ job that compiles the public headers without -fpermissive 51f296a46c ci: Run persistent wineserver to speed up wine 3fb3269c22 ci: Add 32-bit MinGW64 build 9efc2e5221 ci: Add MSVC builds 2be6ba0fed configure: Convince autotools to work with MSVC's archiver lib.exe bd81f4140a schnorrsig bench: Suppress a stupid warning in MSVC 09f3d71c51 configure: Add a few CFLAGS for MSVC 3b4f3d0d46 build: Reject C++ compilers in the preprocessor 1cc0941414 configure: Don't abort if the compiler does not define __STDC__ cca8cbbac8 configure: Output message when checking for valgrind 1a6be5745f bench: Make benchmarks compile on MSVC git-subtree-dir: src/secp256k1 git-subtree-split: 19262492ef5268ff1d76ba45cd1b8b2eaf6d40cd
dhruv · Jan 11, 2023 · 215394a · 215394a
1 parent c41bfd1
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Showing 81 changed files with 4,447 additions and 1,158 deletions.
diff --git a/.cirrus.yml b/.cirrus.yml
@@ -1,6 +1,7 @@
 env:
   ### compiler options
   HOST:
+  WRAPPER_CMD:
   # Specific warnings can be disabled with -Wno-error=foo.
   # -pedantic-errors is not equivalent to -Werror=pedantic and thus not implied by -Werror according to the GCC manual.
   WERROR_CFLAGS: -Werror -pedantic-errors
@@ -18,6 +19,7 @@ env:
   ECDH: no
   RECOVERY: no
   SCHNORRSIG: no
+  ELLSWIFT: no
   ### test options
   SECP256K1_TEST_ITERS:
   BENCH: yes
@@ -26,6 +28,11 @@ env:
   # Compile and run the tests
   EXAMPLES: yes
 
+# https://cirrus-ci.org/pricing/#compute-credits
+credits_snippet: &CREDITS
+  # Don't use any credits for now.
+  use_compute_credits: false
+
 cat_logs_snippet: &CAT_LOGS
   always:
     cat_tests_log_script:
@@ -36,7 +43,6 @@ cat_logs_snippet: &CAT_LOGS
       - cat valgrind_ctime_test.log || true
     cat_bench_log_script:
       - cat bench.log || true
-  on_failure:
     cat_config_log_script:
       - cat config.log || true
     cat_test_env_script:
@@ -67,11 +73,12 @@ task:
   << : *LINUX_CONTAINER
   matrix: &ENV_MATRIX
     - env: {WIDEMUL:  int64,  RECOVERY: yes}
-    - env: {WIDEMUL:  int64,                 ECDH: yes, SCHNORRSIG: yes}
+    - env: {WIDEMUL:  int64,                 ECDH: yes, SCHNORRSIG: yes, ELLSWIFT: yes}
     - env: {WIDEMUL: int128}
-    - env: {WIDEMUL: int128,  RECOVERY: yes,            SCHNORRSIG: yes}
+    - env: {WIDEMUL: int128_struct,                                      ELLSWIFT: yes}
+    - env: {WIDEMUL: int128,  RECOVERY: yes,            SCHNORRSIG: yes, ELLSWIFT: yes}
     - env: {WIDEMUL: int128,                 ECDH: yes, SCHNORRSIG: yes}
-    - env: {WIDEMUL: int128,  ASM: x86_64}
+    - env: {WIDEMUL: int128,  ASM: x86_64                              , ELLSWIFT: yes}
     - env: {                  RECOVERY: yes,            SCHNORRSIG: yes}
     - env: {BUILD: distcheck, WITH_VALGRIND: no, CTIMETEST: no, BENCH: no}
     - env: {CPPFLAGS: -DDETERMINISTIC}
@@ -107,65 +114,32 @@ task:
   << : *CAT_LOGS
 
 task:
-  name: "x86_64: macOS Catalina"
+  name: "arm64: macOS Ventura"
   macos_instance:
-    image: catalina-base
+    image: ghcr.io/cirruslabs/macos-ventura-base:latest
   env:
     HOMEBREW_NO_AUTO_UPDATE: 1
     HOMEBREW_NO_INSTALL_CLEANUP: 1
-    # Cirrus gives us a fixed number of 12 virtual CPUs. Not that we even have that many jobs at the moment...
-    MAKEFLAGS: -j13
+    # Cirrus gives us a fixed number of 4 virtual CPUs. Not that we even have that many jobs at the moment...
+    MAKEFLAGS: -j5
   matrix:
     << : *ENV_MATRIX
+  env:
+    ASM: no
+    WITH_VALGRIND: no
+    CTIMETEST: no
   matrix:
     - env:
-        CC: gcc-9
+        CC: gcc
     - env:
         CC: clang
-  # Update Command Line Tools
-  # Uncomment this if the Command Line Tools on the CirrusCI macOS image are too old to brew valgrind.
-  # See https://apple.stackexchange.com/a/195963 for the implementation.
-  ## update_clt_script:
-  ##   - system_profiler SPSoftwareDataType
-  ##   - touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
-  ##   - |-
-  ##     PROD=$(softwareupdate -l | grep "*.*Command Line" | tail -n 1 | awk -F"*" '{print $2}' | sed -e 's/^ *//' | sed 's/Label: //g' | tr -d '\n')
-  ##   # For debugging
-  ##   - softwareupdate -l && echo "PROD: $PROD"
-  ##   - softwareupdate -i "$PROD" --verbose
-  ##   - rm /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
-  ##
-  brew_valgrind_pre_script:
-    # Retry a few times because this tends to fail randomly.
-    - for i in {1..5}; do brew update && break || sleep 15; done
-    - brew config
-    - brew tap LouisBrunner/valgrind
-    # Fetch valgrind source but don't build it yet.
-    - brew fetch --HEAD LouisBrunner/valgrind/valgrind
-  brew_valgrind_cache:
-    # This is $(brew --cellar valgrind) but command substition does not work here.
-    folder: /usr/local/Cellar/valgrind
-    # Rebuild cache if ...
-    fingerprint_script:
-      # ... macOS version changes:
-      - sw_vers
-      # ... brew changes:
-      - brew config
-      # ... valgrind changes:
-      - git -C "$(brew --cache)/valgrind--git" rev-parse HEAD
-    populate_script:
-      # If there's no hit in the cache, build and install valgrind.
-      - brew install --HEAD LouisBrunner/valgrind/valgrind
-  brew_valgrind_post_script:
-    # If we have restored valgrind from the cache, tell brew to create symlink to the PATH.
-    # If we haven't restored from cached (and just run brew install), this is a no-op.
-    - brew link valgrind
   brew_script:
-    - brew install automake libtool gcc@9
+    - brew install automake libtool gcc
   << : *MERGE_BASE
   test_script:
     - ./ci/cirrus.sh
   << : *CAT_LOGS
+  << : *CREDITS
 
 task:
   name: "s390x (big-endian): Linux (Debian stable, QEMU)"
@@ -178,6 +152,7 @@ task:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
     CTIMETEST: no
   << : *MERGE_BASE
   test_script:
@@ -197,6 +172,7 @@ task:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
     CTIMETEST: no
   matrix:
     - env: {}
@@ -217,6 +193,7 @@ task:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
     CTIMETEST: no
   << : *MERGE_BASE
   test_script:
@@ -234,24 +211,72 @@ task:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
     CTIMETEST: no
   << : *MERGE_BASE
   test_script:
     - ./ci/cirrus.sh
   << : *CAT_LOGS
 
 task:
-  name: "x86_64 (mingw32-w64): Windows (Debian stable, Wine)"
   << : *LINUX_CONTAINER
   env:
-    WRAPPER_CMD: wine64-stable
-    SECP256K1_TEST_ITERS: 16
-    HOST: x86_64-w64-mingw32
+    WRAPPER_CMD: wine
     WITH_VALGRIND: no
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
     CTIMETEST: no
+  matrix:
+    - name: "x86_64 (mingw32-w64): Windows (Debian stable, Wine)"
+      env:
+        HOST: x86_64-w64-mingw32
+    - name: "i686 (mingw32-w64): Windows (Debian stable, Wine)"
+      env:
+        HOST: i686-w64-mingw32
+  << : *MERGE_BASE
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  << : *LINUX_CONTAINER
+  env:
+    WRAPPER_CMD: wine
+    WERROR_CFLAGS: -WX
+    WITH_VALGRIND: no
+    ECDH: yes
+    RECOVERY: yes
+    EXPERIMENTAL: yes
+    SCHNORRSIG: yes
+    ELLSWIFT: yes
+    CTIMETEST: no
+    # Use a MinGW-w64 host to tell ./configure we're building for Windows.
+    # This will detect some MinGW-w64 tools but then make will need only
+    # the MSVC tools CC, AR and NM as specified below.
+    HOST: x86_64-w64-mingw32
+    CC: /opt/msvc/bin/x64/cl
+    AR: /opt/msvc/bin/x64/lib
+    NM: /opt/msvc/bin/x64/dumpbin -symbols -headers
+    # Set non-essential options that affect the CLI messages here.
+    # (They depend on the user's taste, so we don't want to set them automatically in configure.ac.)
+    CFLAGS: -nologo -diagnostics:caret
+    LDFLAGS: -XCClinker -nologo -XCClinker -diagnostics:caret
+  matrix:
+    - name: "x86_64 (MSVC): Windows (Debian stable, Wine)"
+    - name: "x86_64 (MSVC): Windows (Debian stable, Wine, int128_struct)"
+      env:
+        WIDEMUL: int128_struct
+    - name: "x86_64 (MSVC): Windows (Debian stable, Wine, int128_struct with __(u)mulh)"
+      env:
+        WIDEMUL: int128_struct
+        CPPFLAGS: -DSECP256K1_MSVC_MULH_TEST_OVERRIDE
+    - name: "i686 (MSVC): Windows (Debian stable, Wine)"
+      env:
+        HOST: i686-w64-mingw32
+        CC: /opt/msvc/bin/x86/cl
+        AR: /opt/msvc/bin/x86/lib
+        NM: /opt/msvc/bin/x86/dumpbin -symbols -headers
   << : *MERGE_BASE
   test_script:
     - ./ci/cirrus.sh
@@ -264,6 +289,7 @@ task:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
     CTIMETEST: no
   matrix:
     - name: "Valgrind (memcheck)"
@@ -301,23 +327,57 @@ task:
     - ./ci/cirrus.sh
   << : *CAT_LOGS
 
+# Memory sanitizers
 task:
-  name: "C++ -fpermissive"
   << : *LINUX_CONTAINER
+  name: "MSan"
   env:
-    # ./configure correctly errors out when given CC=g++.
-    # We hack around this by passing CC=g++ only to make.
-    CC: gcc
-    MAKEFLAGS: -j4 CC=g++ CFLAGS=-fpermissive\ -g
+    ECDH: yes
+    RECOVERY: yes
+    SCHNORRSIG: yes
+    CTIMETEST: no
+    CC: clang
+    SECP256K1_TEST_ITERS: 32
+    ASM: no
+  container:
+    memory: 2G
+  matrix:
+    - env:
+        CFLAGS: "-fsanitize=memory -g"
+    - env:
+        ECMULTGENPRECISION: 2
+        ECMULTWINDOW: 2
+        CFLAGS: "-fsanitize=memory -g -O3"
+  << : *MERGE_BASE
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  name: "C++ -fpermissive (entire project)"
+  << : *LINUX_CONTAINER
+  env:
+    CC: g++
+    CFLAGS: -fpermissive -g
+    CPPFLAGS: -DSECP256K1_CPLUSPLUS_TEST_OVERRIDE
     WERROR_CFLAGS:
     ECDH: yes
     RECOVERY: yes
     SCHNORRSIG: yes
+    ELLSWIFT: yes
   << : *MERGE_BASE
   test_script:
     - ./ci/cirrus.sh
   << : *CAT_LOGS
 
+task:
+  name: "C++ (public headers)"
+  << : *LINUX_CONTAINER
+  test_script:
+    - g++ -Werror include/*.h
+    - clang -Werror -x c++-header include/*.h
+    - /opt/msvc/bin/x64/cl.exe -c -WX -TP include/*.h
+
 task:
   name: "sage prover"
   << : *LINUX_CONTAINER

diff --git a/.gitignore b/.gitignore
@@ -13,9 +13,9 @@ schnorr_example
 *.so
 *.a
 *.csv
-!.gitignore
 *.log
 *.trs
+*.sage.py
 
 Makefile
 configure
@@ -34,8 +34,6 @@ libtool
 *.lo
 *.o
 *~
-*.log
-*.trs
 
 coverage/
 coverage.html
@@ -44,8 +42,6 @@ coverage.*.html
 *.gcno
 *.gcov
 
-src/libsecp256k1-config.h
-src/libsecp256k1-config.h.in
 build-aux/ar-lib
 build-aux/config.guess
 build-aux/config.sub
@@ -60,5 +56,4 @@ build-aux/m4/ltversion.m4
 build-aux/missing
 build-aux/compile
 build-aux/test-driver
-src/stamp-h1
 libsecp256k1.pc
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -0,0 +1,39 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.2.0] - 2022-12-12
+
+#### Added
+ - Added usage examples for common use cases in a new `examples/` directory.
+ - Added `secp256k1_selftest`, to be used in conjunction with `secp256k1_context_static`.
+ - Added support for 128-bit wide multiplication on MSVC for x86_64 and arm64, giving roughly a 20% speedup on those platforms.
+
+#### Changed
+ - Enabled modules `schnorrsig`, `extrakeys` and `ecdh` by default in `./configure`.
+ - The `secp256k1_nonce_function_rfc6979` nonce function, used by default by `secp256k1_ecdsa_sign`, now reduces the message hash modulo the group order to match the specification. This only affects improper use of ECDSA signing API.
+
+#### Deprecated
+ - Deprecated context flags `SECP256K1_CONTEXT_VERIFY` and `SECP256K1_CONTEXT_SIGN`. Use `SECP256K1_CONTEXT_NONE` instead.
+ - Renamed `secp256k1_context_no_precomp` to `secp256k1_context_static`.
+ - Module `schnorrsig`: renamed `secp256k1_schnorrsig_sign` to `secp256k1_schnorrsig_sign32`.
+
+#### ABI Compatibility
+
+Since this is the first release, we do not compare application binary interfaces.
+However, there are earlier unreleased versions of libsecp256k1 that are *not* ABI compatible with this version.
+
+## [0.1.0] - 2013-03-05 to 2021-12-25
+
+This version was in fact never released.
+The number was given by the build system since the introduction of autotools in Jan 2014 (ea0fe5a5bf0c04f9cc955b2966b614f5f378c6f6).
+Therefore, this version number does not uniquely identify a set of source files.
+
+[unreleased]: https://github.com/bitcoin-core/secp256k1/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/bitcoin-core/secp256k1/compare/423b6d19d373f1224fd671a982584d7e7900bc93..v0.2.0
+[0.1.0]: https://github.com/bitcoin-core/secp256k1/commit/423b6d19d373f1224fd671a982584d7e7900bc93