ACTION-320: Draft language for HMAC section, 6.3.1

Folks,

Also as part of revision 1.73 of xmldsig-core-11\Overview.htm, I made the edits to Section 6.3.1 to resolve ACTION-320.  Specifically, I updated the language for HMAC to read as follows:

The HMAC<http://www.ietf.org/rfc/rfc2104.txt> algorithm (RFC2104 [HMAC]) takes the output (truncation) length in bits as a parameter; this specification REQUIRES that the truncation length be a multiple of 8 (i.e. fall on a byte boundary) because Base64 encoding operates on full bytes.

The part in bold (after the semicolon) is the new language to resolve the bit-vs-byte problem.

                                                                                --bal