72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
#pragma once
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#include <graphene/chain/protocol/types.hpp>
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namespace graphene { namespace chain {
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/**
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* @brief defines the keys used to derive the shared secret
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*
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* Because account authorities and keys can change at any time, each memo must
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* capture the specific keys used to derive the shared secret. In order to read
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* the cipher message you will need one of the two private keys.
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*
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* If @ref from == @ref to and @ref from == 0 then no encryption is used, the memo is public.
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* If @ref from == @ref to and @ref from != 0 then invalid memo data
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*
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* The reason we include *both* keys is to allow the wallet to
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* rebuild the data for any transfer, including the memo, from the
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* user's private keys and the contents of the blockchain --
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* regardless of whether the user is the sender or receiver.
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*/
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struct memo_data
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{
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public_key_type from;
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public_key_type to;
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/**
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* 64 bit nonce format:
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* [ 8 bits | 56 bits ]
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* [ entropy | timestamp ]
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* Timestamp is number of microseconds since the epoch
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* Entropy is a byte taken from the hash of a new private key
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*
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* This format is not mandated or verified; it is chosen to ensure uniqueness of key-IV pairs only. This should
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* be unique with high probability as long as the generating host has a high-resolution clock OR a strong source
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* of entropy for generating private keys.
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*/
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uint64_t nonce;
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/**
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* This field contains the AES encrypted packed @ref memo_message
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*/
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vector<char> message;
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/// @note custom_nonce is for debugging only; do not set to a nonzero value in production
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void set_message(const fc::ecc::private_key& priv,
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const fc::ecc::public_key& pub, const string& msg, uint64_t custom_nonce = 0);
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std::string get_message(const fc::ecc::private_key& priv,
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const fc::ecc::public_key& pub)const;
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};
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/**
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* @brief defines a message and checksum to enable validation of successful decryption
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*
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* When encrypting/decrypting a checksum is required to determine whether or not
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* decryption was successful.
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*/
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struct memo_message
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{
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memo_message(){}
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memo_message( uint32_t checksum, const std::string& text )
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:checksum(checksum),text(text){}
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uint32_t checksum = 0;
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std::string text;
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string serialize() const;
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static memo_message deserialize(const string& serial);
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};
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} } // namespace graphene::chain
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FC_REFLECT( graphene::chain::memo_message, (checksum)(text) )
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FC_REFLECT( graphene::chain::memo_data, (from)(to)(nonce)(message) )
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