57ca0c0e39
Support public account to blinded balance Support receiving blinded balance given confirmation Implement but not test blind to blind transfers.
139 lines
4.3 KiB
C++
139 lines
4.3 KiB
C++
#include <graphene/chain/protocol/confidential.hpp>
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#include <graphene/chain/confidential_evaluator.hpp>
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#include <graphene/chain/database.hpp>
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#include <fc/crypto/base58.hpp>
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#include <fc/io/raw.hpp>
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namespace graphene { namespace chain {
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void transfer_to_blind_operation::validate()const
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{
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FC_ASSERT( fee.amount >= 0 );
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FC_ASSERT( amount.amount > 0 );
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vector<commitment_type> in;
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vector<commitment_type> out(outputs.size());
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int64_t net_public = amount.amount.value;
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for( uint32_t i = 0; i < out.size(); ++i )
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{
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out[i] = outputs[i].commitment;
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/// require all outputs to be sorted prevents duplicates AND prevents implementations
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/// from accidentally leaking information by how they arrange commitments.
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if( i > 0 ) FC_ASSERT( out[i-1] < out[i], "all outputs must be sorted by commitment id" );
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FC_ASSERT( !outputs[i].owner.is_impossible() );
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}
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FC_ASSERT( out.size(), "there must be at least one output" );
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auto public_c = fc::ecc::blind(blinding_factor,net_public);
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FC_ASSERT( fc::ecc::verify_sum( {public_c}, out, 0 ), "", ("net_public",net_public) );
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if( outputs.size() > 1 )
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{
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for( auto out : outputs )
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{
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auto info = fc::ecc::range_get_info( out.range_proof );
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FC_ASSERT( info.max_value <= GRAPHENE_MAX_SHARE_SUPPLY );
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}
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}
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}
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share_type transfer_to_blind_operation::calculate_fee( const fee_parameters_type& k )const
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{
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return k.fee + outputs.size() * k.price_per_output;
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}
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void transfer_from_blind_operation::validate()const
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{
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FC_ASSERT( amount.amount > 0 );
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FC_ASSERT( fee.amount >= 0 );
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FC_ASSERT( inputs.size() > 0 );
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FC_ASSERT( amount.asset_id == fee.asset_id );
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vector<commitment_type> in(inputs.size());
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vector<commitment_type> out;
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int64_t net_public = fee.amount.value + amount.amount.value;
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out.push_back( fc::ecc::blind( blinding_factor, net_public ) );
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for( uint32_t i = 0; i < in.size(); ++i )
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{
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in[i] = inputs[i].commitment;
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/// by requiring all inputs to be sorted we also prevent duplicate commitments on the input
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if( i > 0 ) FC_ASSERT( in[i-1] < in[i], "all inputs must be sorted by commitment id" );
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}
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FC_ASSERT( in.size(), "there must be at least one input" );
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FC_ASSERT( fc::ecc::verify_sum( in, out, 0 ) );
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}
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/**
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* If fee_payer = temp_account_id, then the fee is paid by the surplus balance of inputs-outputs and
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* 100% of the fee goes to the network.
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*/
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account_id_type blind_transfer_operation::fee_payer()const
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{
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return GRAPHENE_TEMP_ACCOUNT;
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}
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/**
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* This method can be computationally intensive because it verifies that input commitments - output commitments add up to 0
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*/
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void blind_transfer_operation::validate()const
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{ try {
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vector<commitment_type> in(inputs.size());
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vector<commitment_type> out(outputs.size());
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int64_t net_public = fee.amount.value;//from_amount.value - to_amount.value;
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for( uint32_t i = 0; i < in.size(); ++i )
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{
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in[i] = inputs[i].commitment;
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/// by requiring all inputs to be sorted we also prevent duplicate commitments on the input
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if( i > 0 ) FC_ASSERT( in[i-1] < in[i] );
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}
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for( uint32_t i = 0; i < out.size(); ++i )
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{
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out[i] = outputs[i].commitment;
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if( i > 0 ) FC_ASSERT( out[i-1] < out[i] );
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FC_ASSERT( !outputs[i].owner.is_impossible() );
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}
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FC_ASSERT( in.size(), "there must be at least one input" );
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FC_ASSERT( fc::ecc::verify_sum( in, out, net_public ), "", ("net_public", net_public) );
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if( outputs.size() > 1 )
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{
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for( auto out : outputs )
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{
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auto info = fc::ecc::range_get_info( out.range_proof );
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FC_ASSERT( info.max_value <= GRAPHENE_MAX_SHARE_SUPPLY );
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}
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}
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} FC_CAPTURE_AND_RETHROW( (*this) ) }
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share_type blind_transfer_operation::calculate_fee( const fee_parameters_type& k )const
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{
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return k.fee + outputs.size() * k.price_per_output;
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}
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/**
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* Packs *this then encodes as base58 encoded string.
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*/
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stealth_confirmation::operator string()const
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{
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return fc::to_base58( fc::raw::pack( *this ) );
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}
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/**
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* Unpacks from a base58 string
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*/
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stealth_confirmation::stealth_confirmation( const std::string& base58 )
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{
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*this = fc::raw::unpack<stealth_confirmation>( fc::from_base58( base58 ) );
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}
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} } // graphene::chain
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