Ok, I get it :
EncryptedData ::= SEQUENCE {
etype [0] Int32 -- EncryptionType --,
kvno [1] UInt32 OPTIONAL,
cipher [2] OCTET STRING -- ciphertext
}
This is the ASN.1 grammar found in the RFC. The EnryptedData class use
cypher, not cyphertext, to reflect the grammar, but the following code
:
...
// build the ciphertext structure
byte[] conFounder = getRandomBytes( getConfounderLength() );
byte[] dataBytes = concatenateBytes( conFounder, plainText );
byte[] checksumBytes = calculateIntegrity( dataBytes,
key.getKeyValue(), usage );
byte[] encryptedData = encrypt( dataBytes, Ke );
byte[] cipherText = concatenateBytes( encryptedData, checksumBytes );
...
use the cipherText, possibly because of the commented name in the
ASN.1 grammar, and because it's the result of the cipher algorithm.
Even if it's not semantically correct, I think it's important to stick
to the RFC naming because then it's easier for new comers to switch
from RFC to the code and back.
--
Regards,
Cordialement,
Emmanuel Lécharny
www.iktek.com
