----- Original Message ----- From: "Nils Larsch" <[EMAIL PROTECTED]>
> > > > BN_mod_exp() will calculate: > > r = (a^p) % m > > I don't think it permits calculation of: > > a = (a^p) %m > > use a extra variable : > BIGNUM *tmp = BN_dup(a); > if (!BN_mod_exp(a, tmp, p, m, ctx)) goto err; > BN_free(tmp); > Shall do. <snip> > > Is the above simply an alternative to doing: > > BIGNUM *tmp = BN_new(); > > /* do stuff with tmp */ > > BN_free(tmp); > > Yes > > > > > What are the circumstances that determine whether I create a BIGNUM with a > > 'BN_CTX_get()' or a 'BN_new()' ? > > In frequently called functions which require a modest amount of BIGNUMs I > would prefer the BN_CTX method (to save the expensive malloc() calls). > In non time-critical functions I would use the 'normal' BN_new() method. > Yep ..... understood. Thanks again for the (very clear) advice and assistance. Cheers, Rob ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
