Library: Foundation
Package: Crypt
Header: Poco/DigestEngine.h
Description
This class is an abstract base class for all classes implementing a message digest algorithm, like MD5Engine and SHA1Engine. Call update() repeatedly with data to compute the digest from. When done, call digest() to obtain the message digest.
Inheritance
Known Derived Classes: Poco::Crypto::RSADigestEngine, HMACEngine, MD4Engine, MD2Engine, MD5Engine, SHA1Engine
Member Summary
Member Functions: digest, digestLength, digestToHex, reset, update, updateImpl
Types
Digest
typedef std::vector < unsigned char > Digest;
Constructors
DigestEngine
DigestEngine();
Destructor
~DigestEngine 
virtual ~DigestEngine();
Member Functions
digest
virtual const Digest & digest() = 0;
Finishes the computation of the digest and returns the message digest. Resets the engine and can thus only be called once for every digest. The returned reference is valid until the next time digest() is called, or the engine object is destroyed.
digestLength
virtual unsigned digestLength() const = 0;
Returns the length of the digest in bytes.
digestToHex 
static std::string digestToHex(
const Digest & bytes
);
Converts a message digest into a string of hexadecimal numbers.
reset
virtual void reset() = 0;
Resets the engine so that a new digest can be computed.
update 
void update(
const void * data,
unsigned length
);
update
void update(
char data
);
update
void update(
const std::string & data
);
Updates the digest with the given data.
updateImpl 
virtual void updateImpl(
const void * data,
unsigned length
) = 0;
Updates the digest with the given data. Must be implemented by subclasses.