openssl -decrypt by Java

Question

all! I am trying to resolve the issue.

I have bat-file with command:

openssl smime -decrypt -binary -inform DER -recip [path to certificate] -inkey  [pat         


        

Answer 1

S/MIME is based on a standard called PKCS #7, the Cryptographic Message Syntax. An S/MIME–encrypted message is not simply the output of an encryption operation; it's a package of meta-data and (optionally) the encrypted content itself. It has to be parsed to find the cipher text, the encrypted content encryption key(s), the algorithm and parameters applied to the content encryption key, the algorithm and parameters applied to the content itself, etc.

A CMS enveloped-data structure contains information for one or more recipients. Each bundle of recipient information contains an identifier for the recipient and a bit of cipher text encrypted with that recipient's public key. If you have the private key corresponding to one of those recipients, you can decrypt the bit of cipher text, which turns out to be another key for a symmetric cipher. With that, and more meta-data about the symmetric cipher mode and parameters, you can decrypt the actual message itself.

To decrypt it, you'll need an S/MIME or CMS library. (Library recommendations are off-topic, but you can look at BouncyCastle.)