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efad3506a8 Merge #906: Use modified divsteps with initial delta=1/2 for constant-time cc2c09e3a7 Merge #918: Clean up configuration in gen_context 07067967ee add ECMULT_GEN_PREC_BITS to basic_config.h a3aa2628c7 gen_context: Don't include basic-config.h be0609fd54 Add unit tests for edge cases with delta=1/2 variant of divsteps cd393ce228 Optimization: only do 59 hddivsteps per iteration instead of 62 277b224b6a Use modified divsteps with initial delta=1/2 for constant-time 376ca366db Fix typo in explanation 1e5d50fa93 Merge #889: fix uninitialized read in tests c083cc6e52 Merge #903: Make argument of fe_normalizes_to_zero{_var} const 6e898534ff Merge #907: changed import to use brackets <> for openssl 4504472269 changed import to use brackets <> for openssl as they are not local to the project 26de4dfeb1 Merge #831: Safegcd inverses, drop Jacobi symbols, remove libgmp 23c3fb629b Make argument of fe_normalizes_to_zero{_var} const 24ad04fc06 Make scalar_inverse{,_var} benchmark scale with SECP256K1_BENCH_ITERS ebc1af700f Optimization: track f,g limb count and pass to new variable-time update_fg_var b306935ac1 Optimization: use formulas instead of lookup tables for cancelling g bits 9164a1b658 Optimization: special-case zero modulus limbs in modinv64 1f233b3fa0 Remove num/gmp support 20448b8d09 Remove unused Jacobi symbol support 5437e7bdfb Remove unused scalar_sqr aa9cc52180 Improve field/scalar inverse tests 1e0e885c8a Make field/scalar code use the new modinv modules for inverses 436281afdc Move secp256k1_fe_inverse{_var} to per-impl files aa404d53be Move secp256k1_scalar_{inverse{_var},is_even} to per-impl files 08d54964e5 Improve bounds checks in modinv modules 151aac00d3 Add tests for modinv modules d8a92fcc4c Add extensive comments on the safegcd algorithm and implementation 8e415acba2 Add safegcd based modular inverse modules de0a643c3d Add secp256k1_ctz{32,64}_var functions 4c3ba88c3a Merge #901: ci: Switch all Linux builds to Debian and more improvements 9361f360bb ci: Select number of parallel make jobs depending on CI environment 28eccdf806 ci: Split output of logs into multiple sections c7f754fe4d ci: Run PRs on merge result instead of on the source branch b994a8be3c ci: Print information about binaries using "file" f24e122d13 ci: Switch all Linux builds to Debian ebdba03cb5 Merge #891: build: Add workaround for automake 1.13 and older 3a8b47bc6d Merge #894: ctime_test: move context randomization test to the end 7d3497cdc4 ctime_test: move context randomization test to the end 99a1cfec17 print warnings for conditional-uninitialized 3d2cf6c5bd initialize variable in tests f329bba244 build: Add workaround for automake 1.13 and older 24d1656c32 Merge #882: Use bit ops instead of int mult for constant-time logic in gej_add_ge e491d06b98 Use bit ops instead of int mult for constant-time logic in gej_add_ge f8c0b57e6b Merge #864: Add support for Cirrus CI cc2a5451dc ci: Refactor Nix shell files 2480e55c8f ci: Remove support for Travis CI 2b359f1c1d ci: Enable simple cache for brewing valgrind on macOS 8c02e465c5 ci: Add support for Cirrus CI 659d0d4798 Merge #880: Add parens around ROUND_TO_ALIGN's parameter. b6f649889a Add parens around ROUND_TO_ALIGN's parameter. This makes the macro robust against a hypothetical ROUND_TO_ALIGN(foo ? sizeA : size B) invocation. a4abaab793 Merge #877: Add missing secp256k1_ge_set_gej_var decl. 5671e5f3fd Merge #874: Remove underscores from header defs. db726782fa Merge #878: Remove unused secp256k1_fe_inv_all_var b732701faa Merge #875: Avoid casting (void**) values. 75d2ae149e Remove unused secp256k1_fe_inv_all_var 482e4a9cfc Add missing secp256k1_ge_set_gej_var decl. 2730618604 Avoid casting (void**) values. Replaced with an expression that only casts (void*) values. fb390c5299 Remove underscores from header defs. This makes them consistent with other files and avoids reserved identifiers. f2d9aeae6d Merge #862: Autoconf improvements 328aaef22a Merge #845: Extract the secret key from a keypair 3c15130709 Improve CC_FOR_BUILD detection 47802a4762 Restructure and tidy configure.ac 252c19dfc6 Ask brew for valgrind include path 8c727b9087 Merge #860: fixed trivial typo b7bc3a4aaa fixed typo 33cb3c2b1f Add secret key extraction from keypair to constant time tests 36d9dc1e8e Add seckey extraction from keypair to the extrakeys tests fc96aa73f5 Add a function to extract the secretkey from a keypair 98dac87839 Merge #858: Fix insecure links 07aa4c70ff Fix insecure links b61f9da54e Merge #857: docs: fix simple typo, dependecy -> dependency 18aadf9d28 docs: fix simple typo, dependecy -> dependency 2d9e7175c6 Merge #852: Add sage script for generating scalar_split_lambda constants dc6e5c3a5c Merge #854: Rename msg32 to msghash32 in ecdsa_sign/verify and add explanation 6e85d675aa Rename tweak to tweak32 in public API f587f04e35 Rename msg32 to msghash32 in ecdsa_sign/verify and add explanation 329a2e0a3f sage: Add script for generating scalar_split_lambda constants 8f0c6f1545 Merge #851: make test count iteration configurable by environment variable f4fa8d226a forbid a test iteration of 0 or less f554dfc708 sage: Reorganize files 3a106966aa Merge #849: Convert Sage code to Python 3 (as used by Sage >= 9) 13c88efed0 Convert Sage code to Python 3 (as used by Sage >= 9) 0ce4554881 make test count iteration configurable by environment variable 9e5939d284 Merge #835: Don't use reserved identifiers memczero and benchmark_verify_t d0a83f7328 Merge #839: Prevent arithmetic on NULL pointer if the scratch space is too small 903b16aa6c Merge #840: Return NULL early in context_preallocated_create if flags invalid 1f4dd03838 Typedef (u)int128_t only when they're not provided by the compiler ebfa2058e9 Return NULL early in context_preallocated_create if flags invalid 29a299e373 Run the undefined behaviour sanitizer on Travis 7506e064d7 Prevent arithmetic on NULL pointer if the scratch space is too small e89278f211 Don't use reserved identifiers memczero and benchmark_verify_t git-subtree-dir: src/secp256k1 git-subtree-split: efad3506a8937162e8010f5839fdf3771dfcf516
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Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
Further information about Bitcoin Core is available in the doc folder.
What is Bitcoin?
Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
For more information read the original Bitcoin whitepaper.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.