In message <[EMAIL PROTECTED]> on Wed, 6 Jul 2005 09:07:23 -0700, "Choudhary, Bimalendu" <[EMAIL PROTECTED]> said:
bchoudhary> 2) When I send the serial number 0x81 the der encoded bchoudhary> serial number is bchoudhary> bchoudhary> 02 02 00 81 bchoudhary> bchoudhary> 4) When I send the serial number 0x8111 the der encoded bchoudhary> serial number is bchoudhary> bchoudhary> 02 03 00 81 11 bchoudhary> bchoudhary> The problem here is that in case 2) and 4) there is a bchoudhary> extra byte 00 appended in front of the actual serial bchoudhary> number given in the command line. bchoudhary> bchoudhary> Can any one tell me why the length is being increased and bchoudhary> an extra 00 is added in front of the serial number in this bchoudhary> two cases. bchoudhary> bchoudhary> It happens foe any serial number starting with hex digit 8 bchoudhary> or above and number of digit in the serial number is even. ASN.1 Complete (downloadable from http://www.oss.com/asn1/larmouth.html), Section 3.3 (Encoding an INTEGER value) explains it. Basically, the integer is a 2-complement value. This means '02 01 81' would be interpreted as (decimal) -127, while '02 02 00 81' is correctly interpreted as (decimal) 129. Cheers, Richard ----- Please consider sponsoring my work on free software. See http://www.free.lp.se/sponsoring.html for details. -- Richard Levitte [EMAIL PROTECTED] http://richard.levitte.org/ "When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up." -- C.S. Lewis ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
