There are (generally) 3 kinds of asymmetric cryptographic algorithms: 1. Signature algorithms, such as DSS, ECDSS, Ed255, and 3 modes of the RSA algorithm. 2. Key exchange/generation algorithms such as DH, ECDH and SRP. 3. Key encryption algorithms, such as 2 other modes of the RSA algorithm. EVP_SealInit() is a function to invoke key encryption algorithms with a brand new random key. On 16/08/2016 02:38, Norm Green wrote: > Sorry, I'm still not quite getting it. > > It sounds like you're saying that only RSA supports encrypting with a > public key. But can't any asymmetric encryption algorithm encrypt > using the public key? Why is RSA special in this regard? > > Norm Green > > On 8/15/2016 5:31 PM, Dr. Stephen Henson wrote: >> On Mon, Aug 15, 2016, Norm Green wrote: >> >>> Ok, thanks. >>> >>> What I don't understand is what key transport has to do with >>> EV_SealInit() ? Why is key transport important here ? >>> >> Because EVP_SealInit() generates a random symmetric key and encrypts >> it using >> one or more public keys. For this to work the public key algorithm >> has to >> support encryption of the symmetric key using a public key aka key >> transport. >> >> Of the public key algorithms OpenSSL currently implements only RSA >> has that >> operation. >> Enjoy Jakob -- Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com Transformervej 29, 2860 S?borg, Denmark. Direct +45 31 13 16 10 This public discussion message is non-binding and may contain errors. WiseMo - Remote Service Management for PCs, Phones and Embedded
