cryptoTools::SHAx Class Reference

Provides a common interface for all the hashfunctions of the SHA-2 family. More...

#include <shax.hpp>

Inheritance diagram for cryptoTools::SHAx:

Collaboration diagram for cryptoTools::SHAx:

Public Member Functions
virtual void	preprocess (std::vector< uint8_t > initialMessage)
	Parses a vector of bytes and applies to it the transformations specified in the NIST's specification.
virtual void	round (unsigned int counter)
	Performs a round over the 16 message bytes contained in M, starting at counter and finishing at counter+"something". In the end, the internal state H is updated to the new value.
virtual void	hash (std::vector< uint8_t > initialMessage)
	Performs all the steps necessary to hash the message given on the input. In the end, the internal state H contains the digest of the message.
virtual std::vector< uint8_t >	getHash ()
	Returns a vector of uint8_t containing the hash.
virtual std::string	getType ()
	To know which hashfunction it is.
virtual uint32_t	getHashLength ()
	To know the bitlength of the hash we should expect.

Detailed Description

Provides a common interface for all the hashfunctions of the SHA-2 family.

These were implemented using the NIST specification. It is available here.

See Also

shatest.cpp

Definition at line 38 of file shax.hpp.

Member Function Documentation

virtual std::vector<uint8_t> cryptoTools::SHAx::getHash ( )

inlinevirtual

Returns a vector of uint8_t containing the hash.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 80 of file shax.hpp.

        {
                std::vector<uint8_t> emptyVector;
                return emptyVector;
        };

virtual uint32_t cryptoTools::SHAx::getHashLength ( )

inlinevirtual

To know the bitlength of the hash we should expect.

Returns

The length of the hash, in bits.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 101 of file shax.hpp.

        {
                return 0;
        }

virtual std::string cryptoTools::SHAx::getType ( )

inlinevirtual

To know which hashfunction it is.

Returns

The name of the hashfunction.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 91 of file shax.hpp.

        {
                return "You shouldn't see this: there is a problem with the SHA functions";
        };

virtual void cryptoTools::SHAx::hash ( std::vector< uint8_t >  initialMessage )

inlinevirtual

Performs all the steps necessary to hash the message given on the input. In the end, the internal state H contains the digest of the message.

Calls preprocess over its input and then uses a loop over the length of the message to call round on each of its blocks.

Parameters

initialMessage

A byte vector containing the message to hash.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 75 of file shax.hpp.

{};

virtual void cryptoTools::SHAx::preprocess ( std::vector< uint8_t >  initialMessage )

inlinevirtual

Parses a vector of bytes and applies to it the transformations specified in the NIST's specification.

Once the call to this function is finished, the M attribute is correctly assigned i.e. it contains 32 bits words, the padding and the length of the initial input. The internal state is also initialised.

Parameters

initialMessage

A byte vector containing the message to hash.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 53 of file shax.hpp.

{};

virtual void cryptoTools::SHAx::round ( unsigned int  counter )

inlinevirtual

Performs a round over the 16 message bytes contained in M, starting at counter and finishing at counter+"something". In the end, the internal state H is updated to the new value.

Reimplemented in cryptoTools::SHA256, cryptoTools::SHA512, and cryptoTools::SHA384.

Definition at line 61 of file shax.hpp.

{};

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

• cryptotools/sha/shax.hpp