sovrin-client 0.1.0-142

Sovrin client with c-callable interface
Documentation 
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# sovrin-client-rust

# Windows build

- Get binary dependencies (libamcl*, openssl, libsodium, libzmq, sqlite3).
- Put all *.{lib,dll} into one directory and headers into include/ subdirectory.
- open MSVS development console
- execute "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
- Point path to this directory using environment variables:
  - set SOVRIN_PREBUILT_DEPS_DIR=C:\BIN\x64
  - set SODIUM_LIB_DIR=C:\BIN\x64
  - set OPENSSL_INCLUDE_DIR=C:\BIN\x64\include
  - set OPENSSL_LIB_DIR=C:\BIN\x64
  - set LIBZMQ_LIB_DIR=C:\BIN\x64
  - set LIBZMQ_INCLUDE_DIR=C:\BIN\x64\include
- set static flag for libsodium build
  - set SODIUM_STATIC=y
- change dir to sovrin-client and run cargo (you may want to add --release --target x86_64-pc-windows-msvc keys to cargo)

## openssl-sys workaround

When your windows build fails complaining on gdi32.lib you should edit

```
  ~/.cargo/registry/src/github.com-*/openssl-sys-*/build.rs
```

and add

```
  println!("cargo:rustc-link-lib=dylib=gdi32");
```

to the end of main() function.

Then try to rebuild whole project.