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kernel: Introduce initial kernel C header API

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As a first step, implement the equivalent of what was implemented in the
now deprecated libbitcoinconsensus header. Also add a test binary to
exercise the header and library.

Unlike the deprecated libbitcoinconsensus the kernel library can now use
the hardware-accelerated sha256 implementations thanks for its
statically-initialzed context. The functions kept around for
backwards-compatibility in the libbitcoinconsensus header are not ported
over. As a new header, it should not be burdened by previous
implementations. Also add a new error code for handling invalid flag
combinations, which would otherwise cause a crash.

The macros used in the new C header were adapted from the libsecp256k1
header.

To make use of the C header from C++ code, a C++ header is also
introduced for wrapping the C header. This makes it safer and easier to
use from C++ code.

Co-authored-by: stickies-v <stickies-v@protonmail.com>
This commit is contained in:
TheCharlatan
2024-05-28 10:32:52 +02:00
parent 3bb30658e6
commit 2cf136dec4
14 changed files with 1415 additions and 9 deletions
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3
CMakeLists.txt
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@@ -105,6 +105,7 @@ option(BUILD_UTIL "Build bitcoin-util executable." ${BUILD_TESTS})
option(BUILD_UTIL_CHAINSTATE "Build experimental bitcoin-chainstate executable." OFF)
option(BUILD_KERNEL_LIB "Build experimental bitcoinkernel library." ${BUILD_UTIL_CHAINSTATE})
option(BUILD_KERNEL_TEST "Build tests for the experimental bitcoinkernel library." ${BUILD_KERNEL_LIB})
option(ENABLE_WALLET "Enable wallet." ON)
if(ENABLE_WALLET)
@@ -210,6 +211,7 @@ if(BUILD_FOR_FUZZING)
set(BUILD_UTIL OFF)
set(BUILD_UTIL_CHAINSTATE OFF)
set(BUILD_KERNEL_LIB OFF)
set(BUILD_KERNEL_TEST OFF)
set(BUILD_WALLET_TOOL OFF)
set(BUILD_GUI OFF)
set(ENABLE_EXTERNAL_SIGNER OFF)
@@ -667,6 +669,7 @@ message(" bitcoin-util ........................ ${BUILD_UTIL}")
message(" bitcoin-wallet ...................... ${BUILD_WALLET_TOOL}")
message(" bitcoin-chainstate (experimental) ... ${BUILD_UTIL_CHAINSTATE}")
message(" libbitcoinkernel (experimental) ..... ${BUILD_KERNEL_LIB}")
message(" kernel-test (experimental) .......... ${BUILD_KERNEL_TEST}")
message("Optional features:")
message(" wallet support ...................... ${ENABLE_WALLET}")
message(" external signer ..................... ${ENABLE_EXTERNAL_SIGNER}")