zypp::Digest Class Reference

Compute Message Digests (MD5, SHA1 etc) More...

#include <Digest.h>

Classes
class	P

Private Member Functions
	Digest (const Digest &d)
const Digest &	operator= (const Digest &d)

Private Attributes
P *	_dp

Well known digest algorithm names.
static const std::string &	md5 ()
	md5
static const std::string &	sha1 ()
	sha1
static const std::string &	sha224 ()
	sha224
static const std::string &	sha256 ()
	sha256
static const std::string &	sha384 ()
	sha384
static const std::string &	sha512 ()
	sha512
static std::string	digestVectorToString (const UByteArray &vec)
	get hex string representation of the digest vector given as parameter
static std::string	digest (const std::string &name, std::istream &is, size_t bufsize=4096)
	compute digest of a stream.
static std::string	digest (const std::string &name, const std::string &input, size_t bufsize=4096)
	Digest ()
	~Digest ()
bool	create (const std::string &name)
	initialize creation of a new message digest
const std::string &	name ()
	get the name of the current digest algorithm
bool	update (const char *bytes, size_t len)
	feed data into digest computation algorithm
bool	update (std::istream &is, size_t bufsize=4096)
	feed data into digest computation algorithm
zypp::ByteCount	bytesHashed () const
	Returns the number of input bytes that have been added to the hash.
std::string	digest ()
	get hex string representation of the digest
UByteArray	digestVector ()
	get vector of unsigned char representation of the digest
bool	reset ()
	reset internal digest state

Detailed Description

Compute Message Digests (MD5, SHA1 etc)

The computation works by initializing the algorithm using create(). This will construct an internal state. successive calls to update() deliver the data for which the digest is to be computed. After all data has been deliverd, a call to digest() finalizes the computation and returns the result

Definition at line 36 of file Digest.h.

Constructor & Destructor Documentation

Digest() [1/2]

zypp::Digest::Digest ( const Digest &  d )

private

Digest() [2/2]

zypp::Digest::Digest

(

)

Definition at line 164 of file Digest.cc.

~Digest()

zypp::Digest::~Digest

(

)

Definition at line 168 of file Digest.cc.

Member Function Documentation

operator=()

const Digest & zypp::Digest::operator= ( const Digest &  d )

private

md5()

const std::string & zypp::Digest::md5 ( )

static

md5

Definition at line 37 of file Digest.cc.

sha1()

const std::string & zypp::Digest::sha1 ( )

static

sha1

Definition at line 40 of file Digest.cc.

sha224()

const std::string & zypp::Digest::sha224 ( )

static

sha224

Definition at line 43 of file Digest.cc.

sha256()

const std::string & zypp::Digest::sha256 ( )

static

sha256

Definition at line 46 of file Digest.cc.

sha384()

const std::string & zypp::Digest::sha384 ( )

static

sha384

Definition at line 49 of file Digest.cc.

sha512()

const std::string & zypp::Digest::sha512 ( )

static

sha512

Definition at line 52 of file Digest.cc.

create()

bool zypp::Digest::create

(

const std::string &

name

)

initialize creation of a new message digest

Since openssl is used as backend you may use anything that openssl supports (see man 1 dgst). Common examples are md5 or sha1. sha1 should be preferred when creating digests to verify the authenticity of something.

successive calls to this funcion will destroy the internal state and reinit from scratch

Parameters

name	name of the message digest algorithm.

Returns

whether an error occured

Definition at line 173 of file Digest.cc.

name()

const std::string & zypp::Digest::name

(

)

get the name of the current digest algorithm

Definition at line 185 of file Digest.cc.

update() [1/2]

bool zypp::Digest::update	(	const char *	bytes,
		size_t	len
	)

feed data into digest computation algorithm

Parameters

bytes
len

Returns

whether an error occured

Definition at line 279 of file Digest.cc.

update() [2/2]

bool zypp::Digest::update	(	std::istream &	is,
		size_t	bufsize = 4096
	)

feed data into digest computation algorithm

Parameters

is
bufsize

Returns

whether an error occured

Definition at line 303 of file Digest.cc.

bytesHashed()

ByteCount zypp::Digest::bytesHashed

(

)

const

Returns the number of input bytes that have been added to the hash.

Definition at line 322 of file Digest.cc.

digest() [1/3]

std::string zypp::Digest::digest

(

)

get hex string representation of the digest

this function will finalize the digest computation. calls to update after this function will start from scratch

Returns

hex string representation of the digest

Definition at line 206 of file Digest.cc.

digestVectorToString()

std::string zypp::Digest::digestVectorToString ( const UByteArray &  vec )

static

get hex string representation of the digest vector given as parameter

Returns

hex string representation of the digest

Definition at line 211 of file Digest.cc.

digestVector()

UByteArray zypp::Digest::digestVector

(

)

get vector of unsigned char representation of the digest

this function will finalize the digest computation. calls to update after this function will start from scratch

Returns

vector representation of the digest

Definition at line 261 of file Digest.cc.

reset()

bool zypp::Digest::reset

(

)

reset internal digest state

this function is equivalent to calling create() with an unchanged name, but it may be implemented in a more efficient way.

Definition at line 190 of file Digest.cc.

digest() [2/3]

std::string zypp::Digest::digest ( const std::string &  name, std::istream &  is, size_t  bufsize = 4096  )

static

compute digest of a stream.

convenience function

calls create, update and digest in one function. The data for the computation is read from the stream

Parameters

name	name of the digest algorithm,

See also

create

Parameters

is	an input stream to get the data from
bufsize	size of the buffer used for update(). Be careful, this is on the stack.

Returns

the digest or empty on error

Definition at line 327 of file Digest.cc.

digest() [3/3]

std::string zypp::Digest::digest ( const std::string &  name, const std::string &  input, size_t  bufsize = 4096  )

static

Definition at line 342 of file Digest.cc.

Member Data Documentation

_dp

P* zypp::Digest::_dp

private

Definition at line 40 of file Digest.h.

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

• zypp/Digest.h
• zypp/Digest.cc