zypp::Digest Class Reference

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

#include <zypp-core/Digest.h>

Classes
class	P

Public Member Functions
	Digest (Digest &&other) noexcept
Digest &	operator= (Digest &&other) noexcept

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

Private Attributes
std::unique_ptr< P >	_dp

Well known digest algorithm names.
	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
Digest	clone () const
	Returns a clone of the current Digest and returns it.
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)

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 37 of file Digest.h.

Constructor & Destructor Documentation

Digest() [1/3]

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

privatedelete

Digest() [2/3]

zypp::Digest::Digest ( Digest && other )

noexcept

Definition at line 185 of file Digest.cc.

Digest() [3/3]

zypp::Digest::Digest

(

)

Definition at line 181 of file Digest.cc.

~Digest()

zypp::Digest::~Digest

(

)

Definition at line 195 of file Digest.cc.

Member Function Documentation

operator=() [1/2]

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

privatedelete

operator=() [2/2]

Digest & zypp::Digest::operator= ( Digest && other )

noexcept

Definition at line 189 of file Digest.cc.

md5()

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

static

md5

Definition at line 42 of file Digest.cc.

sha1()

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

static

sha1

Definition at line 45 of file Digest.cc.

sha224()

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

static

sha224

Definition at line 48 of file Digest.cc.

sha256()

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

static

sha256

Definition at line 51 of file Digest.cc.

sha384()

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

static

sha384

Definition at line 54 of file Digest.cc.

sha512()

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

static

sha512

Definition at line 57 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 198 of file Digest.cc.

name()

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

(

)

get the name of the current digest algorithm

Definition at line 210 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 288 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 312 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 331 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 239 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 244 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 270 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 215 of file Digest.cc.

clone()

Digest zypp::Digest::clone

(

)

const

Returns a clone of the current Digest and returns it.

This is the same as manually creating a Digest with the same name ( so no checksum calculation state is copied )

Definition at line 231 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 336 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 351 of file Digest.cc.

Member Data Documentation

_dp

std::unique_ptr<P> zypp::Digest::_dp

private

Definition at line 41 of file Digest.h.

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

• zypp-core/Digest.h
• zypp-core/Digest.cc