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88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
#ifndef XRPL_PROTOCOL_HASHPREFIX_H_INCLUDED
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#define XRPL_PROTOCOL_HASHPREFIX_H_INCLUDED
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#include <xrpl/beast/hash/hash_append.h>
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#include <cstdint>
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namespace ripple {
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namespace detail {
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constexpr std::uint32_t
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make_hash_prefix(char a, char b, char c)
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{
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return (static_cast<std::uint32_t>(a) << 24) +
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(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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/** Prefix for hashing functions.
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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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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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@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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/** transaction plus signature to give transaction ID */
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transactionID = detail::make_hash_prefix('T', 'X', 'N'),
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/** transaction plus metadata */
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txNode = detail::make_hash_prefix('S', 'N', 'D'),
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/** account state */
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leafNode = detail::make_hash_prefix('M', 'L', 'N'),
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/** inner node in V1 tree */
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innerNode = detail::make_hash_prefix('M', 'I', 'N'),
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/** ledger master data for signing */
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ledgerMaster = detail::make_hash_prefix('L', 'W', 'R'),
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/** inner transaction to sign */
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txSign = detail::make_hash_prefix('S', 'T', 'X'),
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/** inner transaction to multi-sign */
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txMultiSign = detail::make_hash_prefix('S', 'M', 'T'),
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/** validation for signing */
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validation = detail::make_hash_prefix('V', 'A', 'L'),
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/** proposal for signing */
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proposal = detail::make_hash_prefix('P', 'R', 'P'),
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/** Manifest */
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manifest = detail::make_hash_prefix('M', 'A', 'N'),
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/** Payment Channel Claim */
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paymentChannelClaim = detail::make_hash_prefix('C', 'L', 'M'),
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/** Credentials signature */
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credential = detail::make_hash_prefix('C', 'R', 'D'),
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/** Batch */
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batch = detail::make_hash_prefix('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 ripple
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#endif
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