96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
/*
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* Copyright (c) 2015 Cryptonomex, Inc., and contributors.
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*
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* The MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <graphene/protocol/block.hpp>
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#include <fc/io/raw.hpp>
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#include <fc/bitutil.hpp>
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#include <algorithm>
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namespace graphene { namespace protocol {
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digest_type block_header::digest()const
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{
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return digest_type::hash(*this);
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}
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uint32_t block_header::num_from_id(const block_id_type& id)
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{
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return boost::endian::endian_reverse(id._hash[0].value());
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}
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block_id_type signed_block_header::id()const
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{
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auto tmp = fc::sha224::hash( *this );
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tmp._hash[0] = boost::endian::endian_reverse(block_num()); // store the block num in the ID, 160 bits is plenty for the hash
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static_assert( sizeof(tmp._hash[0]) == 4, "should be 4 bytes" );
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block_id_type result;
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memcpy(result._hash, tmp._hash, std::min(sizeof(result), sizeof(tmp)));
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return result;
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}
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fc::ecc::public_key signed_block_header::signee()const
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{
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return fc::ecc::public_key( witness_signature, digest(), true/*enforce canonical*/ );
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}
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void signed_block_header::sign( const fc::ecc::private_key& signer )
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{
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witness_signature = signer.sign_compact( digest() );
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}
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bool signed_block_header::validate_signee( const fc::ecc::public_key& expected_signee )const
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{
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return signee() == expected_signee;
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}
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checksum_type signed_block::calculate_merkle_root()const
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{
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if( transactions.size() == 0 )
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return checksum_type();
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vector<digest_type> ids;
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ids.resize( transactions.size() );
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for( uint32_t i = 0; i < transactions.size(); ++i )
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ids[i] = transactions[i].merkle_digest();
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vector<digest_type>::size_type current_number_of_hashes = ids.size();
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while( current_number_of_hashes > 1 )
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{
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// hash ID's in pairs
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uint32_t i_max = current_number_of_hashes - (current_number_of_hashes&1);
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uint32_t k = 0;
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for( uint32_t i = 0; i < i_max; i += 2 )
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ids[k++] = digest_type::hash( std::make_pair( ids[i], ids[i+1] ) );
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if( current_number_of_hashes&1 )
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ids[k++] = ids[i_max];
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current_number_of_hashes = k;
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}
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return checksum_type::hash( ids[0] );
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}
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} }
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GRAPHENE_EXTERNAL_SERIALIZATION(/*not extern*/, graphene::chain::block_header)
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GRAPHENE_EXTERNAL_SERIALIZATION(/*not extern*/, graphene::chain::signed_block_header)
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GRAPHENE_EXTERNAL_SERIALIZATION(/*not extern*/, graphene::chain::signed_block)
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