DER encoding of numeric data should always be network byte order MSB...LSB. Note that if the high order bit is set then an additional 0 byte is prepended.
.................................... Erik Tkal Juniper OAC/UAC/Pulse Development -----Original Message----- From: owner-openssl-us...@openssl.org [mailto:owner-openssl-us...@openssl.org] On Behalf Of Mike Mohr Sent: Tuesday, December 14, 2010 3:42 PM To: openssl-users@openssl.org Subject: Using DH parameters from OpenSSL Good afternoon, I'm trying to understand the data format that OpenSSL writes out its DH parameters in. I am aware that the actual data is encoded using ASN.1 DER and have a way to parse the container. My question really amounts to byte ordering when DH parameters are generated like this: openssl dhparam -outform DER -5 -out parameters.dh 4096 Take, for example, the safe prime 'p' in parameters.dh. Are its bytes stored in MSB...LSB form, such that the number is interpreted similarly to a human reading base 10 numbers on paper? That is to say, left to right 1 byte at a time? Thanks for any clarification, Mike ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
