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RFC 4634, "US Secure Hash Algorithms (SHA and HMAC-SHA)", July 2006

Note: This RFC has been obsoleted by RFC 6234

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: sec

Errata ID: 2445
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Alfred Hoenes
Date Reported: 2006-08-13
Held for Document Update by: Sean Turner
Date Held: 2010-08-06

Section 8.3 says: 

On mid-page 75, the comment within the function hmacReset says:

   * The HMAC transform looks like:
   *
   * SHA(K XOR opad, SHA(K XOR ipad, text))
   *
   * where K is an n byte key.
   * ipad is the byte 0x36 repeated blocksize times
   * opad is the byte 0x5c repeated blocksize times
   * and text is the data being protected.

It should say:

   * The HMAC transform looks like:
   *
   * SHA(K XOR opad, SHA(K XOR ipad, text))
   *
|  * where K is an n byte key, 0-padded to a total of blocksize bytes,
|  * ipad is the byte 0x36 repeated blocksize times,
|  * opad is the byte 0x5c repeated blocksize times,
   * and text is the data being protected.

Rationale:

Without the addition, the 'XOR' operations in the formula are
undefined.  Additionally, punctuation is made uniform.

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