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XSECCryptoHash Class Reference
[Cryptographic Abstraction Layer]

Interface definition for Hash functions. More...

#include <XSECCryptoHash.hpp>

Inheritance diagram for XSECCryptoHash:

[legend]List of all members.

Public Types
enum	HashType {   HASH_NONE = 0,   HASH_SHA1 = 1 }
	Enumeration of Hash (Digest) types. More...
Public Methods
	XSECCryptoHash ()
virtual	~XSECCryptoHash ()
virtual void	setKey (XSECCryptoKey *key)=0
Digest/Hash functions
virtual void	reset (void)=0
	Rest the hash function. More...
virtual void	hash (unsigned char *data, unsigned int length)=0
	Hash some data. More...
virtual unsigned int	finish (unsigned char *hash, unsigned int maxLength)=0
	Finish up a Digest operation and read the result. More...
Information functions
virtual HashType	getHashType (void)=0

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Detailed Description

Interface definition for Hash functions.

The XSECCryptoHash function is used by the library to manipulate Hashing (Digest) functions.

It is also used as the base class for HMAC functions, and thus has a setKey() method.

Todo:

bring the interface here in-line with that provided for XSECCryptoBase64 - really should have only one way of calling these kinds of objects.

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Member Enumeration Documentation

enum XSECCryptoHash::HashType

Enumeration of Hash (Digest) types. The hash types known to XSEC Enumeration values: HASH_NONE  HASH_SHA1

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Constructor & Destructor Documentation

XSECCryptoHash::XSECCryptoHash (    )  [inline]

virtual XSECCryptoHash::~XSECCryptoHash (    )  [inline, virtual]

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Member Function Documentation

virtual unsigned int XSECCryptoHash::finish (  unsigned char *    hash, unsigned int    maxLength )  [pure virtual]

Finish up a Digest operation and read the result. This call tells the CryptoHash object that the input is complete and to finalise the Digest. The output of the digest is read into the hash buffer (at most maxLength bytes) Parameters: hash  The buffer the hash should be read into. maxLength  The maximum number of bytes to be read into hash Returns: The number of bytes copied into the hash buffer Implemented in OpenSSLCryptoHash, and OpenSSLCryptoHashHMAC.

virtual HashType XSECCryptoHash::getHashType (  void    )  [pure virtual]

Determine the hash type of this object Returns: The hash type Implemented in OpenSSLCryptoHash, and OpenSSLCryptoHashHMAC.

virtual void XSECCryptoHash::hash (  unsigned char *    data, unsigned int    length )  [pure virtual]

Hash some data. Take length bytes of data from the data buffer and update the hash that already exists. This function may (and normally will) be called many times for large blocks of data. Parameters: data  The buffer containing the data to be hashed. length  The number of bytes to be read from data Implemented in OpenSSLCryptoHash, and OpenSSLCryptoHashHMAC.

virtual void XSECCryptoHash::reset (  void    )  [pure virtual]

Rest the hash function. XSEC will call the reset() function prior to re-using a CryptoHash object. Implemented in OpenSSLCryptoHash, and OpenSSLCryptoHashHMAC.

virtual void XSECCryptoHash::setKey (  XSECCryptoKey *    key )  [pure virtual]

The HMAC classes are treated in the library as standard hash objects that just happen to take a key. Thus all hash functions implement this function (potentially just to throw an exception) Sets the key - which needs to have a base class of XSECCryptoKeyHMAC. Parameters: key  The key the HMAC function should use. Implemented in OpenSSLCryptoHash, and OpenSSLCryptoHashHMAC.

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The documentation for this class was generated from the following file:

• XSECCryptoHash.hpp

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