# Weak1::MD2 Class Reference

`#include <md2.h>`

Inheritance diagram for Weak1::MD2:

List of all members.

## Detailed Description

MD2

Definition at line 12 of file md2.h.

## Public Member Functions
void | Update (const byte *input, size_t length)
| process more input
void | TruncatedFinal (byte *hash, size_t size)
| truncated version of Final()
unsigned int | DigestSize () const
| size of the hash/digest/MAC returned by Final()
unsigned int | BlockSize () const
| block size of underlying compression function, or 0 if not block based
HashTransformation & | Ref ()
| return a reference to this object,
virtual byte * | CreateUpdateSpace (size_t &size)
| request space to write input into
virtual void | Final (byte *digest)
| compute hash for current message, then restart for a new message
virtual void | Restart ()
| discard the current state, and restart with a new message
unsigned int | TagSize () const
| same as DigestSize()
virtual unsigned int | OptimalBlockSize () const
| input to Update() should have length a multiple of this for optimal speed
virtual unsigned int | OptimalDataAlignment () const
| returns how input should be aligned for optimal performance
virtual void | CalculateDigest (byte *digest, const byte *input, size_t length)
| use this if your input is in one piece and you don't want to call Update() and Final() separately
virtual bool | Verify (const byte *digest)
| verify that digest is a valid digest for the current message, then reinitialize the object
virtual bool | VerifyDigest (const byte *digest, const byte *input, size_t length)
| use this if your input is in one piece and you don't want to call Update() and Verify() separately
virtual void | CalculateTruncatedDigest (byte *digest, size_t digestSize, const byte *input, size_t length)
| truncated version of CalculateDigest()
virtual bool | TruncatedVerify (const byte *digest, size_t digestLength)
| truncated version of Verify()
virtual bool | VerifyTruncatedDigest (const byte *digest, size_t digestLength, const byte *input, size_t length)
| truncated version of VerifyDigest()
virtual std::string | AlgorithmName () const
| returns name of this algorithm, not universally implemented yet
virtual Clonable * | Clone () const
| this is not implemented by most classes yet
## Static Public Member Functions
static const char * | StaticAlgorithmName ()
## Static Public Attributes
static const int | DIGESTSIZE = 16
static const int | BLOCKSIZE = 16
## Protected Member Functions
void | ThrowIfInvalidTruncatedSize (size_t size) const

## Member Function Documentation

HashTransformation& HashTransformation::Ref | ( |  | ) | `[inline, inherited]`

return a reference to this object,

This function is useful for passing a temporary HashTransformation object to a function that takes a non-const reference.

Definition at line 546 of file cryptlib.h.

virtual void HashTransformation::Final | ( | byte * | digest | ) | `[inline, virtual, inherited]`

compute hash for current message, then restart for a new message

Precondition:
  size of digest == DigestSize().

Definition at line 556 of file cryptlib.h.

Referenced by PKCS5_PBKDF2_HMAC< T >::DeriveKey(), RandomPool::IncorporateEntropy(), and HMAC_Base::TruncatedFinal().

virtual bool HashTransformation::Verify | ( | const byte * | digest | ) | `[inline, virtual, inherited]`

verify that digest is a valid digest for the current message, then reinitialize the object

Default implementation is to call Final() and do a bitwise comparison between its output and digest.

Definition at line 586 of file cryptlib.h.

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

- md2.h
- md2.cpp