Hi,
Even though I have used openssl or ssh-keygen for years to generate key pairs
mainly for SSH purposes, I don't know much about the underlying theory and
finer details of cryptography.
I want to use JSON Web Encryption (JWE) and there we have this concept of Key
Encryption. Key Encryption can be done using RSAES-PKCS1-v1_5 or RSA-OAEP or
RSA-OAEP-256 (c.f. https://tools.ietf.org/html/rfc7518#section-4.2 and
https://tools.ietf.org/html/rfc7518#section-4.3).
The question is how can I use openssl command line tool to create a public key
using RSAES-PKCS1-v1_5, RSA-OAEP, or RSA-OAEP-256 (paddings?)?
At the moment, I use the following command to create a PEM file:
openssl genrsa -out example.pem 2048
Then I use the following command to extract the public key:
openssl rsa -in example.pem -pubout example.pub
What padding is used for this public key? How can I specify that I want it to
be generated with RSAES-PKCS1-v1_5, RSA-OAEP, or RSA-OAEP-256 paddings?
Thanks in advance,
Socrates
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