ports/76289: [Corrected version of ports/76288] `security/digest' with sha256 output miss-match hash value.

[Kenichi Morioka]

>Number:         76289
>Category:       ports
>Synopsis:       [Corrected version of ports/76288] `security/digest' with sha256 output miss-match hash value.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 15 19:30:22 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Kenichi Morioka
>Release:        4-10 RELEASE
>Organization:
Openloop Inc.
>Environment:
FreeBSD gw1 4.10-RELEASE FreeBSD 4.10-RELEASE #0: Tue Oct 12 08:45:15 JST 2004     root at gw1:/usr/src/sys/compile/GATEWAY-001  i386      
>Description:
 When inputting a file consisting of 55-bytes data to security/digest 
command with sha256, the hash value is miss match.


=== An example (All data value is hexadecimal representation.) ===

  [input data (55 bytes)]

    3031323334353637383941424344454630313233343536373839414243444546303132333435363738394142434445463031323334350a

  [Output data value (by `security/digest' with sha256)]

    e875cdeea84dd34be39352361383e370b01b8844ee5559f7ce3b1060bff043d0 (Miss match!)

  [Expected data value]

    3f234cc4c9938ee4fff8642ff108808ae303b7ab405c0ea5f9637541000164b5

==============================================================
>How-To-Repeat:
 Every time, the miss-match hash-value appears only by inputting the file 
consisting of 55-bytes data to `security/digest' command with sha256.
>Fix:
 I think that it is good to correct `the 64-bytes message block 
generator' in sha256 (SHA256_Update() or SHA256_Final() in sha2.c).

(I think that the cause of this problem is not the implementation of 
sha256 transform alogorithm but the process of input-message.)

--
 Because that the 55-bytes input-message becomes just 64 bytes block
after `the message terminator code(0x80)' and `size-field(8-bytes field)'
 are added.
Perhaps, I think the block of a lot of one be made at this time. 
>Release-Note:
>Audit-Trail:
>Unformatted: