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106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
#pragma once
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#include <xrpl/beast/hash/hash_append.h>
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#include <cstdint>
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namespace xrpl {
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namespace detail {
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constexpr std::uint32_t
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makeHashPrefix(char a, char b, char c)
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{
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return (static_cast<std::uint32_t>(a) << 24) + (static_cast<std::uint32_t>(b) << 16) +
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(static_cast<std::uint32_t>(c) << 8);
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}
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} // namespace detail
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/**
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* Prefix for hashing functions.
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*
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* These prefixes are inserted before the source material used to generate
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* various hashes. This is done to put each hash in its own "space." This way,
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* two different types of objects with the same binary data will produce
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* different hashes.
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*
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* Each prefix is a 4-byte value with the last byte set to zero and the first
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* three bytes formed from the ASCII equivalent of some arbitrary string. For
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* example "TXN".
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*
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* @note Hash prefixes are part of the protocol; you cannot, arbitrarily,
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* change the type or the value of any of these without causing breakage.
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*/
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enum class HashPrefix : std::uint32_t {
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/**
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* transaction plus signature to give transaction ID
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*/
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TransactionId = detail::makeHashPrefix('T', 'X', 'N'),
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/**
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* transaction plus metadata
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*/
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TxNode = detail::makeHashPrefix('S', 'N', 'D'),
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/**
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* account state
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*/
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LeafNode = detail::makeHashPrefix('M', 'L', 'N'),
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/**
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* inner node in V1 tree
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*/
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InnerNode = detail::makeHashPrefix('M', 'I', 'N'),
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/**
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* ledger master data for signing
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*/
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LedgerMaster = detail::makeHashPrefix('L', 'W', 'R'),
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/**
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* inner transaction to sign
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*/
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TxSign = detail::makeHashPrefix('S', 'T', 'X'),
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/**
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* inner transaction to multi-sign
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*/
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TxMultiSign = detail::makeHashPrefix('S', 'M', 'T'),
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/**
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* validation for signing
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*/
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Validation = detail::makeHashPrefix('V', 'A', 'L'),
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/**
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* proposal for signing
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*/
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Proposal = detail::makeHashPrefix('P', 'R', 'P'),
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/**
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* Manifest
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*/
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Manifest = detail::makeHashPrefix('M', 'A', 'N'),
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/**
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* Payment Channel Claim
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*/
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PaymentChannelClaim = detail::makeHashPrefix('C', 'L', 'M'),
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/**
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* Batch
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*/
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Batch = detail::makeHashPrefix('B', 'C', 'H'),
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};
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template <class Hasher>
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void
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hash_append(Hasher& h, HashPrefix const& hp) noexcept
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{
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using beast::hash_append;
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hash_append(h, static_cast<std::uint32_t>(hp));
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}
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} // namespace xrpl
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