Crypto++ AES_CCM questions/isues

[spoka...@yahoo.com]

Hi all,
Deadline looms. Hope there is an angel out there.

1. In AES CCM mode, is it possible to use ProcessData like the
following and still get tag verification. I don't see how since I am
not entering the authenticated data anywhere for comparison - just the
output buffer and then the encrypted data.

d.ProcessData(&outbuf[0],&buf[bufoffset],encryptedDataSize);

2. The reason we are trying ProcessData is that the following code
crashes on every other attempt:
CCM< AES, TAG_SIZE >::Decryption d;


d.SetKeyWithIV( key, sizeof(key), iv, sizeof(iv) );
d.SpecifyDataLengths( bufoffset, enc.size(), 0 ); (bufoffset has the
10 bytes of authen data
AuthenticatedDecryptionFilter df( d, NULL,
AuthenticatedDecryptionFilter::MAC_AT_END |
AuthenticatedDecryptionFilter::THROW_EXCEPTION );
df.ChannelPut( "AAD", &buf_adata[0], bufoffset );

df.ChannelPut("", (const byte*)enc.data(), enc.size() );
df.ChannelPut( "", (const byte*)tag.data(), tag.size() );

df.ChannelMessageEnd("AAD");
df.ChannelMessageEnd("");


Is there some clean up I need to do after this call?
Has anyone been able to use ProcessData in AESCCM and verify the
authenticated data vs the tag?
Thanks
Don H

[Jeffrey Walton]

On Apr 3, 8:34 pm, "spokane...@yahoo.com" <spokane...@yahoo.com>
wrote:

http://www.cryptopp.com/wiki/Ccm