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# go-srp
## Introduction
Golang implementation of the [SRP protocol](https://datatracker.ietf.org/doc/html/rfc5054), used for authentication of ProtonMail users.
## License
Copyright (c) 2019 Proton Technologies AG
Please see [LICENSE](LICENSE.txt) file for the license.
## Doc
- [Technical blog post](https://protonmail.com/blog/encrypted_email_authentication/)
- [RFC 5054](https://datatracker.ietf.org/doc/html/rfc5054)
## .NET Wrapper
The `windows` folder contains the wrapper for .net.
## Build for mobile apps
Setup Go Mobile and build/bind the source code:
Go Mobile repo: https://github.com/golang/mobile
Go Mobile wiki: https://github.com/golang/go/wiki/Mobile
1. Install Go: `brew install go`
2. Install Gomobile: `go get -u golang.org/x/mobile/cmd/gomobile`
3. Install Gobind: `go install golang.org/x/mobile/cmd/gobind`
4. Install Android SDK and NDK using Android Studio
5. Set env: `export ANDROID_HOME="/AndroidSDK"` (path to your SDK)
6. Init gomobile: `gomobile init -ndk /AndroidSDK/ndk-bundle/` (path to your NDK)
7. Copy Go module dependencies to the vendor directory: `go mod vendor`
8. Build examples:
`gomobile build -target=android #or ios`
Bind examples:
`gomobile bind -target ios -o frameworks/name.framework`
`gomobile bind -target android`
The bind will create framework for iOS and jar&aar files for Android (x86_64 and ARM).
#### Other notes
If you wish to use `build.sh`, you may need to modify the paths in it.
```go
go mod vendor
```
```bash
./build.sh
```
## Dependencies
[github.com/ProtonMail/bcrypt (fork of github.com/jameskeane/bcrypt)](https://github.com/ProtonMail/bcrypt)
[golang.org/x/mobile](https://golang.org/x/mobile)
[github.com/ProtonMail/go-crypto](https://github.com/ProtonMail/go-crypto)
[github.com/cronokirby/saferith](https://github.com/cronokirby/saferith)
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