SiAlgorithm Class Reference

pure virtual base class of the public key crypto systems used for signature creation and verification. More...

Inheritance diagram for SiAlgorithm:

Public Member Functions
	SiAlgorithm ()
	default constructor
virtual	~SiAlgorithm ()
	destructor
virtual OFCondition	sign (const unsigned char *inputHash, unsigned long inputHashSize, E_MACType inputHashAlgorithm, unsigned char *outputSignature, unsigned long &outputSignatureSize)=0
	creates a signature. More...
virtual OFCondition	verify (const unsigned char *inputHash, unsigned long inputHashSize, E_MACType inputHashAlgorithm, const unsigned char *inputSignature, unsigned long inputSignatureSize, OFBool &verified)=0
	verifies a signature. More...
virtual unsigned long	getSize () const =0
	returns the size of a block of encrypted/decrypted ciphertext in bytes. More...
virtual E_KeyType	keyType () const =0
	returns the type of public key algorithm computed by this object More...

Detailed Description

pure virtual base class of the public key crypto systems used for signature creation and verification.

All public key algorithm classes should inherit from this class. Instances of derived classes contain a single private or public key.

Remarks

this class is only available if DCMTK is compiled with OpenSSL support enabled.

Member Function Documentation

getSize()

virtual unsigned long SiAlgorithm::getSize ( ) const

pure virtual

returns the size of a block of encrypted/decrypted ciphertext in bytes.

The result depends on the public key algorithm, key size and padding scheme. In general the input to decrypt() or encrypt() must be less than or equal to this block size. The output of decrypt() or encrypt() is always equal to this block size.

Returns

block size for this public key cryptosystem and key

Implemented in SiRSA, SiDSA, and SiECDSA.

keyType()

virtual E_KeyType SiAlgorithm::keyType ( ) const

pure virtual

returns the type of public key algorithm computed by this object

Returns

type of public key algorithm

Implemented in SiRSA, SiDSA, and SiECDSA.

sign()

virtual OFCondition SiAlgorithm::sign ( const unsigned char *  inputHash, unsigned long  inputHashSize, E_MACType  inputHashAlgorithm, unsigned char *  outputSignature, unsigned long &  outputSignatureSize  )

pure virtual

creates a signature.

Parameters

inputHash	array of hash key bytes that are to be signed
inputHashSize	length of hash key array in bytes
inputHashAlgorithm	MAC algorithm used for creation of hash key. Required for creation of PKCS#1 RSA signature padding.
outputSignature	pointer to array of at least getSize() which must be allocated by caller.
outputSignatureSize	returns the number of bytes written to outputSignature.

Returns

SI_EC_Normal if successful, errorcode otherwise.

Implemented in SiRSA, SiDSA, and SiECDSA.

verify()

virtual OFCondition SiAlgorithm::verify ( const unsigned char *  inputHash, unsigned long  inputHashSize, E_MACType  inputHashAlgorithm, const unsigned char *  inputSignature, unsigned long  inputSignatureSize, OFBool &  verified  )

pure virtual

verifies a signature.

Parameters

inputHash	array of bytes containing hash key to be verified against signature
inputHashSize	length of hash key array in bytes
inputHashAlgorithm	MAC algorithm used for creation of hash key. Required for creation of PKCS#1 RSA signature padding.
inputSignature	array of bytes containing signature to be verified
inputSignatureSize	length of signature array in bytes
verified	returns whether the signature was successfully verified

Returns

SI_EC_Normal if successful, errorcode otherwise.

Implemented in SiRSA, SiDSA, and SiECDSA.

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

• dcmsign/include/dcmtk/dcmsign/sialgo.h