Improve HMAC generator to accept encoded (Hex / Base64) or un-encoded keys

[ayomawdb]

Description:
Currently the HMAC generator expects an un-encoded key to proceed (text). It is required to provide the ability to use encoded key values with the HMAC generation function. This can be done by accepting the encoding type as an additional parameter:

public native function hmac(string baseString, string keyString, Encoding keyEncoding, Algorithm algorithm) returns (string);

This is discussed in [email protected] mail thread "AWS signature requires digest (binary format)". n2group/package-crypto implements a temporary solution until this improvement is done.

Steps to reproduce:
N/A

Affected Versions:
0.980.1

OS, DB, other environment details and versions:
N/A

Suggested Labels (optional):
Component/stdlib Type/Improvement

Suggested Assignees (optional):