On Tue, Nov 06, 2012, Andy Polyakov wrote: > >Can the same pointer safely be used for the input and output buffers in > >encrypt and decrypt operations ? > >i.e. is something like AES_encrypt(out,out,key) guaranteed not to rewrite > >the input before it's been processed ? > > > >The following IMPLIES this is safe but lingering doubts remain. > > > >... > > > >Note: I'm interested in the general case. AES was just used as an example > >of the type of operation and it's the example I found which implied this > >works. > > > >Alternatively do any test cases exist that'd fail if someone provided asm > >which broke this behaviour ?. > > > >Checking the source code only goes so far, it'd be really hard to verify > >all the asm modules. > > The least I can say is that I always consider inp==out as valid case. >
So do I. There are some places in the SSL/TLS code that require encryption in place i.e. inp==out. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List [email protected] Automated List Manager [email protected]
