- Added Doxygen source code documentation parts (donated by Fox-IT)

doxygen/input/doc_encdec.h

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+/**
+ * @file
+ * Encryption/decryption module documentation file.
+ */
+
+/**
+ * @addtogroup encdec_module Encryption/decryption module
+ * 
+ * The Encryption/decryption module provides encryption/decryption functions. 
+ * One can differtiate between symmetric and asymetric algorithms; the 
+ * symmetric ones are mostly used for message confidentiality and the asymmetric 
+ * ones for key exchange and message integrity.
+ * Some symmetric algorithms provide different block cipher modes, mainly 
+ * Electronic Code Book (ECB) which is used for short (64-bit) messages and 
+ * Cipher Block Chaining (CBC) which provides the randomness needed for longer 
+ * messages. 
+ * Sometimes the same functions are used for encryption and decryption.
+ * The following algorithms are provided:
+ * - Symmetric:
+ *   - AES (see \c aes_crypt_ecb() and\c aes_crypt_cbc()).
+ *   - ARCFOUR (see \c arc4_crypt()).
+ *   - Camellia (see \c camellia_crypt_ecb() and\c camellia_crypt_cbc()).
+ *   - DES/3DES (see \c des_crypt_ecb(),\c des_crypt_cbc(),\c des3_crypt_ecb() 
+ *     and\c des3_crypt_cbc()).
+ *   - XTEA (see \c xtea_crypt_ecb()).
+ * - Asymmetric:
+ *   - Diffie-Hellman-Merkle (see \c dhm_read_public(),\c dhm_make_public() 
+ *     and \c dhm_calc_secret()).
+ *   - RSA (see \c rsa_public() and\c rsa_private()).
+ *
+ * This module provides encryption/decryption which can be used to provide 
+ * secrecy.
+ * It also provides asymmetric key functions which can be used for 
+ * confidentiality, integrity, authentication and non-repudiation. 
+ */

doxygen/input/doc_hashing.h

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+/**
+ * @file
+ * Hashing module documentation file.
+ */
+
+/**
+ * @addtogroup hashing_module Hashing module
+ * 
+ * The Hashing module provides one-way hashing functions. Such functions can be
+ * used for creating a hash message authentication code (HMAC) when sending a 
+ * message. Such a HMAC can be used in combination with a private key
+ * for authentication, which is a message integrity control. 
+ * The following hashing-algorithms are provided:
+ * - MD2, MD4, MD5 128-bit one-way hash functions by Ron Rivest (see 
+ *   \c md2_hmac(),\c md4_hmac() and\c md5_hmac()).
+ * - SHA-1, SHA-256, SHA-384/512 160-bit or more one-way hash functions by 
+ *   NIST and NSA (see\c sha1_hmac(),\c sha2_hmac() and\c sha4_hmac()).
+ *
+ * This module provides one-way hashing which can be used for authentication.
+ */

doxygen/input/doc_mainpage.h

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+l/**
+ * @file
+ * Main page documentation file.
+ */
+
+/**
+ * @mainpage PolarSSL v0.14.0 source code documentation
+ * 
+ * This documentation describes the internal structure of PolarSSL.  It was
+ * automatically generated from specially formatted comment blocks in
+ * PolarSSL's source code using Doxygen.  (See
+ * http://www.stack.nl/~dimitri/doxygen/ for more information on Doxygen)
+ * 
+ * PolarSSL has a simple setup: it provides the ingredients for an SSL/TLS 
+ * implementation. These ingredients are listed as modules in the 
+ * \ref mainpage_modules "Modules section". This "Modules section" introduces 
+ * the high-level module concepts used throughout this documentation.\n 
+ * Some examples of PolarSSL usage can be found in the \ref mainpage_examples
+ * "Examples section".
+ * 
+ * 
+ * @section mainpage_modules Modules
+ * 
+ * PolarSSL supports SSLv3 up to TLSv1.1 communication by providing the 
+ * following:
+ * - TCP/IP communication functions: listen, connect, accept, read/write.
+ * - SSL/TLS communication functions: init, handshake, read/write.
+ * - X.509 functions: CRT, CRL and key handling
+ * - Random number generation
+ * - Hashing
+ * - Encryption/decryption
+ *
+ * Above functions are split up neatly into logical interfaces. These can be 
+ * used separately to provide any of the above functions or to mix-and-match 
+ * into an SSL server/client solution that utilises a X.509 PKI. Examples of 
+ * such implementations are amply provided with the source code. Note that 
+ * there is also an OpenSSL wrapper provided.\n
+ * Note that PolarSSL does not provide a control channel or (multiple) session
+ * handling. 
+ *
+ * @section mainpage_examples Examples
+ * 
+ * Example server setup:
+ *
+ * \b Prerequisites: 
+ * - X.509 certificate and private key
+ * - session handling functions
+ *
+ * \b Setup:
+ * - Load your certificate and your private RSA key (X.509 interface)
+ * - Setup the listening TCP socket (TCP/IP interface)
+ * - Accept incoming client connection (TCP/IP interface)
+ * - Initialise as an SSL-server (SSL/TLS interface)
+ *   - Set parameters, e.g. authentication, ciphers, CA-chain, key exchange
+ *   - Set callback functions RNG, IO, session handling
+ * - Perform an SSL-handshake (SSL/TLS interface)
+ * - Read/write data (SSL/TLS interface)
+ * - Close and cleanup (all interfaces)
+ *
+ *
+ * Example client setup:
+ *
+ * \b Prerequisites:
+ * - X.509 certificate and private key
+ * - X.509 trusted CA certificates
+ *
+ * \b Setup:
+ * - Load the trusted CA certificates (X.509 interface)
+ * - Load your certificate and your private RSA key (X.509 interface)
+ * - Setup a TCP/IP connection (TCP/IP interface)
+ * - Initialise as an SSL-client (SSL/TLS interface)
+ *   - Set parameters, e.g. authentication mode, ciphers, CA-chain, session
+ *   - Set callback functions RNG, IO
+ * - Perform an SSL-handshake (SSL/TLS interface)
+ * - Verify the server certificate (SSL/TLS interface)
+ * - Write/read data (SSL/TLS interface)
+ * - Close and cleanup (all interfaces)
+ *
+ * 
+ */

doxygen/input/doc_rng.h

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+/**
+ * @file
+ * Random number generator (RNG) module documentation file.
+ */
+
+/**
+ * @addtogroup rng_module Random number generator (RNG) module
+ * 
+ * The Random number generator (RNG) module provides random number
+ * generation, see \c havege_rand(). It uses the HAVEGE (HArdware Volatile 
+ * Entropy Gathering and Expansion) software heuristic which is claimed 
+ * to be an unpredictable or empirically strong* random number generation.
+ *
+ * \* Meaning that there seems to be no practical algorithm that can guess
+ * the next bit with a probability larger than 1/2 in an output sequence.
+ *
+ * This module can be used to generate random numbers.
+ */

doxygen/input/doc_ssltls.h

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+/**
+ * @file
+ * SSL/TLS communication module documentation file.
+ */
+
+/**
+ * @addtogroup ssltls_communication_module SSL/TLS communication module
+ * 
+ * The SSL/TLS communication module provides the means to create an SSL/TLS
+ * communication channel. 
+ * The basic provisions are:
+ * - initialise an SSL/TLS context (see \c ssl_init()).
+ * - perform an SSL/TLS handshake (see \c ssl_handshake()).
+ * - read/write (see \c ssl_read() and\c ssl_write()).
+ * - notify a peer that conection is being closed (see \c ssl_close_notify()).
+ *
+ *
+ * Many aspects of such a channel are set through parameters and callback
+ * functions:
+ * - the endpoint role: client or server.
+ * - the authentication mode. Should verification take place.
+ * - the Host-to-host communication channel. A TCP/IP module is provided.
+ * - the random number generator (RNG).
+ * - the ciphers to use for encryption/decryption.
+ * - session control functions.
+ * - X.509 parameters for certificate-handling and key exchange.
+ * 
+ *
+ * This module can be used to create an SSL/TLS server and client and to provide a basic
+ * framework to setup and communicate through an SSL/TLS communication channel.\n
+ * Note that you need to provide for several aspects yourself as mentioned above.
+ */

doxygen/input/doc_tcpip.h

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+/**
+ * @file
+ * TCP/IP communication module documentation file.
+ */
+
+/**
+ * @addtogroup tcpip_communication_module TCP/IP communication module
+ * 
+ * The TCP/IP communication module provides for a channel of
+ * communication for the \link ssltls_communication_module SSL/TLS communication 
+ * module\endlink to use. 
+ * In the TCP/IP-model it provides for communication up to the Transport 
+ * (or Host-to-host) layer. 
+ * SSL/TLS resides on top of that, in the Application layer, and makes use of
+ * its basic provisions:
+ * - listening on a port (see \c net_bind()).
+ * - accepting a connection (through \c net_accept()).
+ * - read/write (through \c net_recv/\c net_send()).
+ * - close a connection (through \c net_close()).
+ *
+ * This way you have the means to, for example, implement and use an UDP or 
+ * IPSec communication solution as a basis.
+ * 
+ * This module can be used at server- and clientside to provide a basic
+ * means of communication over the internet.
+ */

doxygen/input/doc_x509.h

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+/**
+ * @file
+ * X.509 module documentation file.
+ */
+
+/**
+ * @addtogroup x509_module X.509 module
+ * 
+ * The X.509 module provides X.509 support which includes:
+ * - X.509 certificate (CRT) reading (see \c x509parse_crt() and
+ *   \c x509parse_crtfile()).
+ * - X.509 certificate revocation list (CRL) reading (see \c x509parse_crl()
+ *   and\c x509parse_crlfile()).
+ * - X.509 (RSA) private key reading (see \c x509parse_key() and
+ *   \c x509parse_keyfile()).
+ * - X.509 certificate signature verification (see \c x509parse_verify())
+ *
+ * This module can be used to build a certificate authority (CA) chain and
+ * verify its signature. It is also used to get a (RSA) private key for signing
+ * and decryption.
+ */