https://github.com/EOSIO/fc/blob/df5a17ef0704d7dd96c444bfd9a70506bcfbc057/include/fc/crypto/public_key.hpp#L11

namespace fc { namespace crypto {
   namespace config {
      constexpr const char* public_key_legacy_prefix = "EOS"; // 修改EOS为需要的前缀即可，如BSC

BCSkill技术社区论坛开放

为了方便问题收集，促进学习激情，我们的BCSkill技术社区新建一个论坛。
网址：http://wiki.bcskill.com/

欢迎学习EOS等区块链技术的小伙伴，以及求职招聘（招聘加群请注明）相关的加入~

求职板块：http://wiki.bcskill.com/?forum-2.htm
招聘版块：http://wiki.bcskill.com/?forum-3.htm
我们社区内有很多区块链技术不错的小伙伴，有需要人手的，快来发帖吧~

此贴定期更新一批邀请码，或者加QQ群791420381直接获取，邀请码永远是免费的。只是为了防止垃圾广告帖，减少不必要的内容维护。

邀请码 （20190626更新）

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git config --system --unset credential.helper

then enter new password for Git remote server.

参考

https://stackoverflow.com/questions/47860772/gitlab-remote-http-basic-access-denied-and-fatal-authentication

由于合约中使用nlohmann/json解析json时，当遇到float类型时报"wabt out of bounds memory access"
不断调试代码，找到如下位置
https://github.com/nlohmann/json/blob/d2a08ddafd503b02b3418194c31e121e105411c6/include/nlohmann/detail/input/lexer.hpp#L1005
由于合约内不会考虑float类型，项目较急，先直接不解析此类型，下面位置添加return token_type::parse_error;

scan_number_decimal1:
    return token_type::parse_error; //在这加一个return
    // state: we just parsed a decimal point
    number_type = token_type::value_float;
    switch (get())
    {
        case '0':
        case '1':
        case '2':
        case '3':

并且由于合约内不允许使用try,修改下
https://github.com/nlohmann/json/blob/b52c3638f58291c2f2564aa31ad0a4a15cd01c84/include/nlohmann/detail/macro_scope.hpp#L68

// allow to disable exceptions
#if (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)) && !defined(JSON_NOEXCEPTION)
    // #define JSON_THROW(exception) throw exception 修改为如下
    #define JSON_THROW(exception) eosio_assert(false, exception.c_str());
    #define JSON_TRY try
    #define JSON_CATCH(exception) catch(exception)
    #define JSON_INTERNAL_CATCH(exception) catch(exception)
#else
    #include <cstdlib>
    // #define JSON_THROW(exception) std::abort() 修改为如下
    #define JSON_THROW(exception) eosio_assert(false, exception.c_str());
    #define JSON_TRY if(true)
    #define JSON_CATCH(exception) if(false)
    #define JSON_INTERNAL_CATCH(exception) if(false)
#endif

// override exception macros
#if defined(JSON_THROW_USER)
    #undef JSON_THROW
    #define JSON_THROW JSON_THROW_USER
#endif

先零散的记一下，后面再整理

js ecc

https://github.com/EOSIO/eosjs-ecc/blob/7ec577cad54e17da6168fdfb11ec2b09d6f0e7f0/src/signature.js

sign

https://github.com/EOSIO/eosjs-ecc/blob/7ec577cad54e17da6168fdfb11ec2b09d6f0e7f0/src/signature.js#L177

Signature.sign = function(data, privateKey, encoding = 'utf8') {
    if(typeof data === 'string') {
        data = Buffer.from(data, encoding)
    }
    assert(Buffer.isBuffer(data), 'data is a required String or Buffer')
    data = hash.sha256(data)
    return Signature.signHash(data, privateKey)
}

https://github.com/EOSIO/eosjs-ecc/blob/7ec577cad54e17da6168fdfb11ec2b09d6f0e7f0/src/signature.js#L210

 ecsignature = ecdsa.sign(curve, dataSha256, privateKey.d, nonce++);

java

https://github.com/adyliu/jeos/blob/53dbd027cd59d367d9a197cbff5a58bdd9bf7195/src/main/java/io/jafka/jeos/impl/LocalApiImpl.java#L68

private String sign(String privateKey, SignArg arg, PackedTransaction t) {
    Raw raw = Packer.packPackedTransaction(arg.getChainId(), t);
    raw.pack(ByteBuffer.allocate(33).array());// TODO: what's this?
    String hash = KeyUtil.signHash(privateKey, raw.bytes());
    return hash;
}

https://github.com/adyliu/jeos/blob/4eaa9fb4555129f3d0baa56e7ffb70cac213a009/src/main/java/io/jafka/jeos/util/ecc/Ecdsa.java

https://github.com/starkbank/ecdsa-java/blob/master/src/main/java/com/starkbank/ellipticcurve/Ecdsa.java

参考

ECDSA — The art of cryptographic signatures
https://medium.com/coinmonks/ecdsa-the-art-of-cryptographic-signatures-d0bb254c8b96