Library: Foundation
Package: Crypt
Header: Poco/DigestEngine.h
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.
Known Derived Classes: Poco::Crypto::RSADigestEngine, HMACEngine, MD4Engine, MD5Engine, SHA1Engine
Member Functions: digest, digestLength, digestToHex, reset, update, updateImpl
typedef std::vector < unsigned char > Digest;
DigestEngine();
virtual ~DigestEngine();
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.
virtual unsigned digestLength() const = 0;
Returns the length of the digest in bytes.
static std::string digestToHex(
const Digest & bytes
);
Converts a message digest into a string of hexadecimal numbers.
virtual void reset() = 0;
Resets the engine so that a new digest can be computed.
void update(
const void * data,
unsigned length
);
void update(
char data
);
void update(
const std::string & data
);
Updates the digest with the given data.
virtual void updateImpl(
const void * data,
unsigned length
) = 0;
Updates the digest with the given data. Must be implemented by subclasses.