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
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