Date: Tue, 11 Jan 2005 16:06:17 GMT From: Kenichi Morioka <morioka@openloop.co.jp> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/76106: Invalid hash-value is output by the `digest' command with sha256 mode. Message-ID: <200501111606.j0BG6Hme045496@www.freebsd.org> Resent-Message-ID: <200501111610.j0BGAU25051233@freefall.freebsd.org>
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>Number: 76106 >Category: misc >Synopsis: Invalid hash-value is output by the `digest' command with sha256 mode. >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jan 11 16:10:30 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@gw1:/usr/src/sys/compile/GATEWAY-001 i386 >Description: When inputting a file including 54-byte data, the digest command output invalid hash value. (where, the input data size is 55-byte as including return code(0x0a).) In a word, when inputting the 55-byte message data to sha256, output value is invalid. Such a result is only when using 55-byte input data. >How-To-Repeat: When a file including 54-byte(size of that final data becomes 55-byte) is input to `digest' in sha256-mode. >Fix: I think that it is good to correct `the 64-byte message block generator' in sha256 (SHA256_Update() or SHA256_Final() in sha2.c). (I think that this cause of this problem is not the implementation of sha256 transform alogorithm but the process of input message block.) -- Because that the message of 55-bytes is the values that become just 64 bytes when `the message terminator code(0x80)' and `size-field(8-byte)' are added. Perhaps, I think this block of a lot of one be made at this time. >Release-Note: >Audit-Trail: >Unformatted:
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