If you have any problems with SSLeay then please take the following steps: Remove the ASM version of the BN routines (edit Configure) Remove the compiler optimisation flags Add in the compiler debug flags (-g) Note: if using gcc then remove -fomit-frame-pointer before you try to debug things. If you wish to report a bug then please include the following information in any bug report: SSLeay Details - Version, most of these details can be got from the 'ssleay version -a' command. Operating System Details - OS Name - OS Version - Hardware platform Compiler Details - Name - Version Application Details - Name - Version Problem Description - include steps that will reproduce the problem (if known) Stack Traceback (if the application dumps core) For example: OpenSSL-0.9.1c SunOS 5.3, SPARC, SunC 3.0 SSLtelnet-0.7 Core dumps when using telnet with SSL support in bn_mul() with the following stack trackback ... Report the bug to the OpenSSL project at: openssl-users@openssl.org