Working with digital signatures in Go

I would like to use signatures for a program that I am writing in Go, but I can't figure out the documentation, which is here. In particular, I would like to use the SignPKCS1v15 and VerifyPKCS1v15 functions, but I'm not sure exactly what I have to pass as arguments. I would greatly benefit from some example code of these two functions. Thanks.

Note: The message that I would like to send is a struct that I defined.

I think the src\pkg\crypto\rsa\pkcs1v15_test.go file in the Go source tree should be a good start.

An update striving provide more context… Go source contains many tests for the code in its standard library (and the crypto/rsa package is a part of it), so whenever you have no idea how to use a standard package (or, actually, any other Go package), a good place to start is to look at the tests involving that package as testing code naturally uses the package! Tests are kept in files ending in _test.go, usually have meaningful names and are located in the same directories actual code implementing a particular package is kept.

So in your particular case you could do this:

1. Download the Go source package of the version matching your compiler (what go version shows) and unpack it somewhere.
2. Navigate to the directory matching the package of interest. Code for standard Go packages is located in the "pkg" directory under the "src" top-level directory, so if you're interested in the crypto/rsa package, you need the src/pkg/crypto/rsa directory.