Difference between revisions of "Libbitcoin Consensus"
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| − | + | The [https://github.com/libbitcoin/libbitcoin-consensus libbitcoin-consensus] library is an optional dependency of [[Libbitcoin_Blockchain|libbitcoin-blockchain]]. It is conceptually redundant with native functionality within [[Libbitcoin_Common|libbitcoin]]. | |
| + | |||
| + | ==Example== | ||
| + | #include <cstdint> | ||
| + | #include <string> | ||
| + | #include <vector> | ||
| + | #include <bitcoin/consensus.hpp> | ||
| + | |||
| + | // For bc::decode_base16 utility. | ||
| + | #include <bitcoin/bitcoin.hpp> | ||
| + | |||
| + | #define VERIFY_TX \ | ||
| + | "01000000017d01943c40b7f3d8a00a2d62fa1d560bf739a2368c180615b0a793" \ | ||
| + | "7c0e883e7c000000006b4830450221008f66d188c664a8088893ea4ddd968902" \ | ||
| + | "4ea5593877753ecc1e9051ed58c15168022037109f0d06e6068b7447966f751d" \ | ||
| + | "e8474641ad2b15ec37f4a9d159b02af68174012103e208f5403383c77d5832a2" \ | ||
| + | "68c9f71480f6e7bfbdfa44904becacfad66163ea31ffffffff01c8af00000000" \ | ||
| + | "00001976a91458b7a60f11a904feef35a639b6048de8dd4d9f1c88ac00000000" | ||
| + | |||
| + | #define PREVOUT_SCRIPT \ | ||
| + | "76a914c564c740c6900b93afc9f1bdaef0a9d466adf6ee88ac" | ||
| + | |||
| + | // Validate a transaction against a single previous output script. | ||
| + | int main() | ||
| + | { | ||
| + | using namespace libbitcoin::consensus; | ||
| + | |||
| + | constexpr uint32_t tx_input_index = 0; | ||
| + | constexpr uint32_t flags = verify_flags_standard | verify_flags_mandatory; | ||
| + | |||
| + | const std::string tx(VERIFY_TX); | ||
| + | const std::string ps(PREVOUT_SCRIPT); | ||
| + | |||
| + | std::vector<uint8_t> tx_data, ps_data; | ||
| + | /* bool */ bc::decode_base16(tx_data, tx); | ||
| + | /* bool */ bc::decode_base16(ps_data, ps); | ||
| + | |||
| + | const auto result = verify_script(&tx_data[0], tx_data.size(), | ||
| + | &ps_data[0], ps_data.size(), tx_input_index, flags); | ||
| + | |||
| + | return result == verify_result_eval_true ? 0 : 1; | ||
| + | } | ||
| + | |||
| + | ==Bindings== | ||
| + | The library exposes a C++ interface and includes [http://www.swig.org SWIG] generated bindings for other languages. | ||
| + | * C++ (native) | ||
| + | * Java | ||
| + | * Python | ||
| + | |||
| + | ==Dependencies== | ||
| + | * [https://www.openssl.org openssl] (optional, default) | ||
| + | * [https://github.com/bitcoin/secp256k1 libsecp256k1] (optional, experimental) | ||
| + | * [http://www.boost.org/doc/libs/1_55_0/libs/test/doc/html/index.html boost test] (tests only) | ||
| + | |||
| + | ==See Also== | ||
| + | * [[Libbitcoin]] | ||
Revision as of 06:55, 14 May 2015
The libbitcoin-consensus library is an optional dependency of libbitcoin-blockchain. It is conceptually redundant with native functionality within libbitcoin.
Contents
Example
#include <cstdint>
#include <string>
#include <vector>
#include <bitcoin/consensus.hpp>
// For bc::decode_base16 utility.
#include <bitcoin/bitcoin.hpp>
#define VERIFY_TX \
"01000000017d01943c40b7f3d8a00a2d62fa1d560bf739a2368c180615b0a793" \
"7c0e883e7c000000006b4830450221008f66d188c664a8088893ea4ddd968902" \
"4ea5593877753ecc1e9051ed58c15168022037109f0d06e6068b7447966f751d" \
"e8474641ad2b15ec37f4a9d159b02af68174012103e208f5403383c77d5832a2" \
"68c9f71480f6e7bfbdfa44904becacfad66163ea31ffffffff01c8af00000000" \
"00001976a91458b7a60f11a904feef35a639b6048de8dd4d9f1c88ac00000000"
#define PREVOUT_SCRIPT \
"76a914c564c740c6900b93afc9f1bdaef0a9d466adf6ee88ac"
// Validate a transaction against a single previous output script.
int main()
{
using namespace libbitcoin::consensus;
constexpr uint32_t tx_input_index = 0;
constexpr uint32_t flags = verify_flags_standard | verify_flags_mandatory;
const std::string tx(VERIFY_TX);
const std::string ps(PREVOUT_SCRIPT);
std::vector<uint8_t> tx_data, ps_data;
/* bool */ bc::decode_base16(tx_data, tx);
/* bool */ bc::decode_base16(ps_data, ps);
const auto result = verify_script(&tx_data[0], tx_data.size(),
&ps_data[0], ps_data.size(), tx_input_index, flags);
return result == verify_result_eval_true ? 0 : 1;
}
Bindings
The library exposes a C++ interface and includes SWIG generated bindings for other languages.
- C++ (native)
- Java
- Python
Dependencies
- openssl (optional, default)
- libsecp256k1 (optional, experimental)
- boost test (tests only)
