bslh::SipHashAlgorithm Class Reference

#include <bslh_siphashalgorithm.h>

List of all members.

Public Types
enum	{ k_SEED_LENGTH = 16 }
typedef Uint64	result_type
Public Member Functions
	SipHashAlgorithm (const char *seed)
	~SipHashAlgorithm ()
void	operator() (const void *data, size_t numBytes)
result_type	computeHash ()

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Detailed Description

This class wraps an implementation of the "SipHash" algorithm in an interface that is usable in the modular hashing system in bslh.

See Component bslh_siphashalgorithm

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Member Typedef Documentation

typedef Uint64 bslh::SipHashAlgorithm::result_type

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Member Enumeration Documentation

anonymous enum

Seed length in bytes.

Enumerator:

k_SEED_LENGTH

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Constructor & Destructor Documentation

bslh::SipHashAlgorithm::SipHashAlgorithm

(

const char *

seed

)

[explicit]

Create a bslh::SipHashAlgorithm, seeded with a 128-bit (k_SEED_LENGTH bytes) seed pointed to by the specified seed. Each bit of the supplied seed will contribute to the final hash produced by computeHash(). The behaviour is undefined unless seed points to at least 16 bytes of initialized memory. Note that if data in seed is not random, all guarantees of security and Denial of Service (DoS) protection are void.

bslh::SipHashAlgorithm::~SipHashAlgorithm

(

)

Destroy this object.

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Member Function Documentation

void bslh::SipHashAlgorithm::operator()	(	const void *	data,
		size_t	numBytes
	)

Incorporate the specified data, of at least the specified numBytes, into the internal state of the hashing algorithm. Every bit of data incorporated into the internal state of the algorithm will contribute to the final hash produced by computeHash(). The same hash will be produced regardless of whether a sequence of bytes is passed in all at once or through multiple calls to this member function. Input where numBytes is 0 will have no effect on the internal state of the algorithm. The behaviour is undefined unless data points to a valid memory location with at least numBytes bytes of initialized memory.

result_type bslh::SipHashAlgorithm::computeHash

(

)

Return the finalized version of the hash that has been accumulated. Note that this changes the internal state of the object, so calling computeHash() multiple times in a row will return different results, and only the first result returned will match the expected result of the algorithm. Also note that a value will be returned, even if data has not been passed into operator()

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Member Data Documentation

Uint64 bslh::SipHashAlgorithm::d_alignment

unsigned char bslh::SipHashAlgorithm::d_buf[8]

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

• bslh_siphashalgorithm.h