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opencoin-issuer-cpp - a C++ OpenCoin Issuer REST-API implementation {#mainpage}
=============================================================
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![build](https://github.com/OpenCoin/opencoin-issuer-cpp/actions/workflows/cmake.yaml/badge.svg)
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# opencoin issuer
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this is a C++ implementation of the [opencoin protocol](https://opencoin.org/OpenCoin.html)
done as mapping to some kind of REST interface.
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As all issuer related interactions of the protocol follows a request/response mechanism we are able to map all of them to Http-Requests.
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We decided to use POST-Requests in all cases,
as the protocol uses JSON-formatted messages for requests.
The following table gives an overview of the mapping of requests to URLs:
| Request | URL | Response | C++ Interface Method |
|:------------------|:-------------|:------------------------------|:---------------------------------------------------|
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| RequestCDDCSerial | /cddc/serial | ResponseCDDCSerial | cdd.cdd_serial of Model::get_current_cddc() |
| RequestCDDC | /cddc | ResponseCDDC | Model::get_current_cddc() |
| RequestMKCs | /mkcs | ResponseMKCs | Model::getMKCs |
| RequestMint | /mint | ResponseMint | Model::mint |
| RequestRenew | /renew | ResponseMint or ResponseDelay | ? |
| RequestResume | /resume | ResponseMint or ResponseDelay | ? |
| RequestRedeem | /redeem | ResponseRedeem | Model::redeem |
actually the implementation is a work in progress.
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## TODO
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- [ ] select crypto library
+ https://en.wikipedia.org/wiki/Comparison_of_cryptography_libraries
+ [ ] blinding utilizing crypto++
+ [ ] integrate session and login to make transactions account based
+ [ ] bookkeeping for accounts
## Protocol Questions
+ What is signed as cdd - only the content of the cdd item with curly braces
or also the key?
+ the weighted URL as array has a different js encoding as other elements
+ Clarify PSS usage (see https://crypto.stackexchange.com/questions/12707/usability-of-padding-scheme-in-blinded-rsa-signature)
### Blinding Notes
https://stackoverflow.com/questions/47860570/how-to-create-and-verify-blind-rsa-signatures-with-crypto
https://crypto.stackexchange.com/questions/12707/usability-of-padding-scheme-in-blinded-rsa-signature
https://crypto.stackexchange.com/questions/54085/is-there-a-standard-padding-format-for-rsa-blind-signatures/60728#60728
https://crypto.stackexchange.com/questions/5626/rsa-blind-signatures-in-practice
<https://cfrg.github.io/draft-irtf-cfrg-blind-signatures/draft-irtf-cfrg-rsa-blind-signatures.html>
alternative implementation using openssl
https://github.com/jedisct1/blind-rsa-signatures