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
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