Feature Request: string to []byte and Hmac (Cryptographic)

[kanaksinghal]

https://golang.org/pkg/crypto/hmac/

Thanks :)

[johnlane]

Looking for hmac today also. I wanted to do the equivalent of

openssl dgst -binary -sha256 -hmac secret

[f0o]

Bump :)

Sha256HMAC as addition to Sha256Sum would be great!