eos代码阅读笔记07- 事务签名过程 - 好文

在创建账号的时候有一步是 sign_transaction, 具体创建账号的方法请查看创建账号
<https://blog.csdn.net/zfdabc_ok/article/details/80857661>
REQUEST: --------------------- POST /v1/wallet/sign_transaction HTTP/1.0 Host:
localhost content-length: 688 Accept: */* Connection: close
[{"expiration":"2018-06-29T08:02:46","ref_block_num":46,"ref_block_prefix":2928461137,"max_net_usage_words":0,"max_cpu_usage_ms":0,"delay_sec":0,"context_free_actions":[],"actions":[{"account":"eosio","name":"newaccount","authorization":[{"actor":"eosio","permission":"active"}],"data":"0000000000ea305500000000000040c801000000010002f17657f3303512f7b0ea2f2a682aa8b1b693817d98d959800fdcf480881aef0a0100000001000000010002f17657f3303512f7b0ea2f2a682aa8b1b693817d98d959800fdcf480881aef0a01000000"}],"transaction_extensions":[],"signatures":[],"context_free_data":[]},["EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV"],"cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f"]
--------------------- RESPONSE: --------------------- { "expiration":
"2018-06-29T08:02:46", "ref_block_num": 46, "ref_block_prefix": 2928461137,
"max_net_usage_words": 0, "max_cpu_usage_ms": 0, "delay_sec": 0,
"context_free_actions": [], "actions": [{ "account": "eosio", "name":
"newaccount", "authorization": [{ "actor": "eosio", "permission": "active" } ],
"data":
"0000000000ea305500000000000040c801000000010002f17657f3303512f7b0ea2f2a682aa8b1b693817d98d959800fdcf480881aef0a0100000001000000010002f17657f3303512f7b0ea2f2a682aa8b1b693817d98d959800fdcf480881aef0a01000000"
} ], "transaction_extensions": [], "signatures": [
"SIG_K1_KenQx2BuGv5tYU31Q97oQLgowyw9woDhRdxuUcRYrk34qyoBnEMjUcECL14juchJATCzM5rj14LP5ATViy5mDyZVpyGh8N"
], "context_free_data": [] }
定义签名方法，pk为公钥

wallet_manager.cpp

chain::signed_transaction wallet_manager::sign_transaction(const
chain::signed_transaction& txn, const flat_set<public_key_type>& keys, const
chain::chain_id_type& id) { check_timeout(); chain::signed_transaction
stxn(txn); for (const auto& pk : keys) { bool found = false; for (const auto& i
: wallets) { if (!i.second->is_locked()) { optional<signature_type> sig =
i.second->try_sign_digest(stxn.sig_digest(id, stxn.context_free_data), pk); if
(sig) { stxn.signatures.push_back(*sig); found = true; break; // inner for } }
} if (!found) { EOS_THROW(chain::wallet_missing_pub_key_exception, "Public key
not found in unlocked wallets ${k}", ("k", pk)); } } return stxn; }
sig_digest，从这个函数来看，签名包括signed_transaction
digest_type transaction::sig_digest( const chain_id_type& chain_id, const
vector<bytes>& cfd )const { digest_type::encoder enc; fc::raw::pack( enc,
chain_id );链ID fc::raw::pack( enc, *this );包括整个事务对象 if( cfd.size() ) {
fc::raw::pack( enc, digest_type::hash(cfd) ); } else { fc::raw::pack( enc,
digest_type() ); } return enc.result(); }
通过公钥找到私钥，然后签名数据。

wallet.cpp
optional<signature_type> try_sign_digest( const digest_type digest, const
public_key_type public_key ) { auto it = _keys.find(public_key); if( it ==
_keys.end() ) return optional<signature_type>{};return it->second.sign(digest);
}私钥定义
class private_key { public: using storage_type =
static_variant<ecc::private_key_shim, r1::private_key_shim>; private_key() =
default; private_key( private_key&& ) = default; private_key( const
private_key& ) = default; private_key& operator= (const private_key& ) =
default; public_key get_public_key() const; signaturesign( const sha256&
digest, bool require_canonical = true ) const;

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