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45 lines
3.9 KiB
C++
45 lines
3.9 KiB
C++
#ifndef BITCOIN_BLIND_H_
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#define BITCOIN_BLIND_H_ 1
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#include "key.h"
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#include "pubkey.h"
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#include "primitives/transaction.h"
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#include <secp256k1.h>
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#include <secp256k1_rangeproof.h>
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#include <secp256k1_surjectionproof.h>
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bool GenerateRangeproof(std::vector<unsigned char>& vchRangeproof, const std::vector<unsigned char*>& blindptrs, const uint256& nonce, const CAmount amount, const CScript& scriptPubKey, const secp256k1_pedersen_commitment& commit, const secp256k1_generator& gen, const CAsset& asset, std::vector<const unsigned char*>& assetblindptrs);
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bool SurjectOutput(CTxOutWitness& txoutwit, const std::vector<secp256k1_fixed_asset_tag>& inputAssets, const std::vector<secp256k1_generator>& inputAssetGenerators, const std::vector<uint256 >& input_asset_blinding_factors, const std::vector<const unsigned char*> assetblindptrs, const secp256k1_generator& gen, const CAsset& asset);
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uint256 GenerateOutputRangeproofNonce(CTxOut& out, const CPubKey output_pubkey);
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void BlindAsset(CConfidentialAsset& confAsset, secp256k1_generator& gen, const CAsset& asset, const unsigned char* assetblindptr);
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void CreateValueCommitment(CConfidentialValue& value, secp256k1_pedersen_commitment& commit, const unsigned char* blindptr, const secp256k1_generator& gen, const CAmount amount);
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/*
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* blinding_key is used to create the nonce to rewind the rangeproof in conjunction with the nNonce commitment. In the case of a 0-length nNonce, the blinding key is directly used as the nonce.
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* Currently there is only a sidechannel message in the rangeproof so a valid rangeproof must
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* be included in the pair to recover value and asset data.
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*/
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bool UnblindConfidentialPair(const CKey& blinding_key, const CConfidentialValue& value, const CConfidentialAsset& asset, const CConfidentialNonce& nNonce, const CScript& committedScript, const std::vector<unsigned char>& vchRangeproof, CAmount& amount_out, uint256& blinding_factor_out, CAsset& asset_out, uint256& asset_blinding_factor_out);
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/* Returns the number of ouputs that were successfully blinded.
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* In many cases a `0` can be fixed by adding an additional output.
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* @param[in] input_blinding_factors - A vector of input blinding factors that will be used to create the balanced output blinding factors
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* @param[in] input_asset_blinding_factors - A vector of input asset blinding factors that will be used to create the balanced output blinding factors
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* @param[in] input_assets - the asset of each corresponding input
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* @param[in] input_amounts - the unblinded amounts of each input. Required for owned blinded inputs
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* @param[in/out] output_blinding_factors - A vector of blinding factors. New blinding factors will replace these values.
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* @param[in/out] output_asset_blinding_factors - A vector of asset blinding factors. New blinding factors will replace these values.
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* @param[in] output_pubkeys - If valid, corresponding output must be unblinded, and will result in fully blinded output, modifying the output blinding arguments as well.
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* @param[in] vBlindIssuanceAsset - List of keys to use as nonces for issuance asset blinding.
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* @param[in] vBlindIssuanceToken - List of keys to use as nonces for issuance token blinding.
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* @param[in/out] tx - The transaction to be modified.
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* @param[in] auxiliary_generators - a list of generators to create surjection proofs when inputs are not owned by caller. Passing in non-empty elements results in ignoring of other input arguments for that index
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*/
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int BlindTransaction(std::vector<uint256 >& input_blinding_factors, const std::vector<uint256 >& input_asset_blinding_factors, const std::vector<CAsset >& input_assets, const std::vector<CAmount >& input_amounts, std::vector<uint256 >& output_blinding_factors, std::vector<uint256 >& output_asset_blinding_factors, const std::vector<CPubKey>& output_pubkeys, const std::vector<CKey>& vBlindIssuanceAsset, const std::vector<CKey>& vBlindIssuanceToken, CMutableTransaction& tx, std::vector<std::vector<unsigned char> >* auxiliary_generators = NULL);
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#endif
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