Encoding of rsa1024.dat rsa2048.dat (PKCS #1 - ASN.1/BER?)

[Jeffrey Walton]

Hi All,

Can anyone verify this creates files in the same format as those
provided by Wei in rsa400pb.dat, rsa400pv.dat, rsa1024.dat, and
rsa2048.dat? On the test which I have run, eack string k begins with
0x30 (SEQUENCE_TAG ), as does the various rsa*.dat files. I looked at
rsa400pv.dat from Crypto++ 4.2 - it is the same file.

I attempted to look at PK_FinalTemplate for AccessKey(),
AccessPublicKey, and AccessPrivateKey() - Crypto++ stresses the limit
of Intellisense in VS 6.0 and VS 7.0.

BTW, you can't simply call RSAES_OAEP_SHA_Decryptor::BEREncode() - it
is ambiguous due to MI.

Jeff

////////////////////////////////////////////////////////////////
AutoSeededRandomPool rng;

// Specify modulus, accept e = 17
RSAES_OAEP_SHA_Decryptor Decryptor( rng, 128 /*, e */ );

// BER Encode Key
string k;
HexEncoder encoder( new StringSink( k ) );
Decryptor.AccessKey().Save( encoder );

cout << k << endk;

[Wei Dai]

Your code is pretty much the same as GenerateRSAKey() in test.cpp which
was used to generate rsa1024.dat and rsa2048.dat.

rsa400pv.dat actually has a different format from the rest. The other
RSA private key files are encoded as PKCS#8 privateKeyInfo, whereas
rsa400pv.dat is only the privateKey part of privateKeyInfo. If you look
at the code in validat2.cpp that loads rsa400pv.dat, you'll notice that
it's different from loading the other keys.

[Jeffrey Walton]

Hi Wei,

Thanks. Most of my code starts from your test harness or validate
programs.

Jeff