Hi Steve, I've just solved the problem, as you correctly guessed, I was using strlen(buffer) as the length of the string to decrypt. The fact that it was sometimes working would be the case where the random element would not result in an embedded null being produced. I suppose this problem is why people use the bp bio structure. i.e. this contains both data and datalen parameters.
Thanks Chris R ----- Original Message ----- From: "Dr. Stephen Henson" <[EMAIL PROTECTED]> To: <openssl-users@openssl.org> Sent: Tuesday, September 20, 2005 3:19 AM Subject: Re: rsa_publiic_encrypt problem On Mon, Sep 19, 2005, Chris Rutherford wrote: > Hi All, > > I have a strange problem with RSA_Public_Encrypt. Basically it only > produces decipherable information about 50% of the time, but with > the > same clear text string. i.e. I have an RSA encrypt decrypt > benchmark > program using a static clear text char string. sometimes it works, > but other times it produces a padding error when I decrypt, but > using > the same clear text. Is this some kind of seeding problem? How > else > could it work about 50% of the time with the same clear text? > I did answer this before but it doesn't seem to have made it to the list. Are you assuming the result is a text string and using/copying it with something like strlen()? If so that will fail if the result contains an embedded null. RSA_public_encrypt() with PKCS#1 padding contains a random element so you will get different results for the same plaintext. Steve. -- Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage OpenSSL project core developer and freelance consultant. Funding needed! Details on homepage. Homepage: http://www.drh-consultancy.demon.co.uk ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
