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    <p>Okay, I've found what I've been looking for, and I think it is better than OpenSSL (for my purposes, at least).</p> <p>There are two libraries:<br> <a href="http://www.libtom.org/LibTomCrypt/" rel="nofollow noreferrer">libtomcrypt</a>, which implements several cyphers (including RSA), and <a href="http://www.libtom.org/LibTomMath/" rel="nofollow noreferrer">libtommath</a>, that implements bignum arithmetics. Both libraries are in public domain, easy to hack/modify and have simpler programming interface than OpenSSL, and (much) better documentation than OpenSSL.<br> <a href="http://www.efgh.com/software/rsa.htm" rel="nofollow noreferrer">Unlike older public domain rsa code I found before</a>, libtomcrypt can generate new keys very quickly, can import OpenSSL-generated keys, and supports padding. Another good thing about libtomcrypt is that it doesn't have extra dependencies (OpenSSL for windows wants gdi32, for example) and is smaller than OpenSSL.</p> <p>I've decided to use RSA for encryption, after all, because (to me it looks like) there are no truly asymmetric alternatives. It looks like most of the other ciphers (elgamal, elliptic curves) are more suitable for symmetric encryption where session key is being encrypted asymmetrically. Which isn't suitable for me. Such ciphers are suitable for network communications/session keys, but it wouldn't be good to use that for static unchanging data on disk.</p> <p>As for "RSA being slow", I've changed archive format a bit, so now only small chunk of data is being asymmetrically encrypted. Failure to decrypt this chunk will make reading archive index completely very difficult if not impossible. Also, I must admit that slowness of RSA was partially a wrong impression given by <a href="http://www.efgh.com/software/rsa.htm" rel="nofollow noreferrer">older code</a> I've tried to use before. </p> <p>Which means, question solved. Solution is RSA + libtomcrypt. RSA - because there aren't many alternatives to RSA, and libtomcrypt - because it is small and in public domain. </p>
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