Here is a list of all documented files with brief descriptions:

[detail level 123]

include
QtCrypto
qca.h	Summary header file for QCA
qca_basic.h	Header file for classes for cryptographic primitives (basic operations)
qca_cert.h	Header file for PGP key and X.509 certificate related classes
qca_core.h	Header file for core QCA infrastructure
qca_keystore.h	Header file for classes that provide and manage keys
qca_publickey.h	Header file for PublicKey and PrivateKey related classes
qca_safetimer.h
qca_securelayer.h	Header file for SecureLayer and its subclasses
qca_securemessage.h	Header file for secure message (PGP, CMS) classes
qca_support.h	Header file for "support" classes used in QCA
qca_textfilter.h	Header file for text encoding/decoding classes
qca_tools.h	Header file for "tool" classes used in QCA
qcaprovider.h	Header file for provider implementation classes (plugins)
qpipe.h	Header file for the QPipe FIFO class
qca_version.h	Header file with QCA version