PTLib
Version 2.10.10
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Tiny Encryption Algorithm. More...
#include <cypher.h>
Classes | |
struct | Key |
Public Member Functions | |
PTEACypher (BlockChainMode chainMode=ElectronicCodebook) | |
Create a new TEA encryption object instance. | |
PTEACypher (const Key &keyData, BlockChainMode chainMode=ElectronicCodebook) | |
void | SetKey (const Key &newKey) |
Set the key used by this encryption method. | |
void | GetKey (Key &newKey) const |
Get the key used by this encryption method. | |
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PString | Encode (const PString &str) |
Encode the data. | |
PString | Encode (const PBYTEArray &clear) |
Encode the data. | |
PString | Encode (const void *data, PINDEX length) |
Encode the data. | |
void | Encode (const PBYTEArray &clear, PBYTEArray &coded) |
Encode the data. | |
void | Encode (const void *data, PINDEX length, PBYTEArray &coded) |
Encode the data. | |
PString | Decode (const PString &cypher) |
Decode the data. | |
PBoolean | Decode (const PString &cypher, PString &clear) |
Decode the data. | |
PBoolean | Decode (const PString &cypher, PBYTEArray &clear) |
Decode the data. | |
PINDEX | Decode (const PString &cypher, void *data, PINDEX length) |
Decode the data. | |
PINDEX | Decode (const PBYTEArray &coded, void *data, PINDEX length) |
Decode the data. | |
PBoolean | Decode (const PBYTEArray &coded, PBYTEArray &clear) |
Decode the data. | |
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virtual | ~PObject () |
virtual PObject * | Clone () const |
Create a copy of the class on the heap. | |
virtual PINDEX | HashFunction () const |
This function yields a hash value required by the PDictionary class. | |
virtual const char * | GetClass (unsigned ancestor=0) const |
Get the current dynamic type of the object instance. | |
PBoolean | IsClass (const char *cls) const |
virtual PBoolean | InternalIsDescendant (const char *clsName) const |
Determine if the dynamic type of the current instance is a descendent of the specified class. | |
virtual Comparison | Compare (const PObject &obj) const |
Compare the two objects and return their relative rank. | |
virtual Comparison | CompareObjectMemoryDirect (const PObject &obj) const |
Determine the byte wise comparison of two objects. | |
bool | operator== (const PObject &obj) const |
Compare the two objects. | |
bool | operator!= (const PObject &obj) const |
Compare the two objects. | |
bool | operator< (const PObject &obj) const |
Compare the two objects. | |
bool | operator> (const PObject &obj) const |
Compare the two objects. | |
bool | operator<= (const PObject &obj) const |
Compare the two objects. | |
bool | operator>= (const PObject &obj) const |
Compare the two objects. | |
virtual void | PrintOn (ostream &strm) const |
Output the contents of the object to the stream. | |
virtual void | ReadFrom (istream &strm) |
Input the contents of the object from the stream. |
Static Public Member Functions | |
static void | GenerateKey (Key &newKey) |
Generate a new key suitable for use for encryption using random data. |
Protected Member Functions | |
virtual void | Initialise (PBoolean encoding) |
Initialise the encoding/decoding sequence. | |
virtual void | EncodeBlock (const void *in, void *out) |
Encode an n bit block of memory according to the encryption algorithm. | |
virtual void | DecodeBlock (const void *in, void *out) |
Decode an n bit block of memory according to the encryption algorithm. | |
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PCypher (PINDEX blockSize, BlockChainMode chainMode) | |
Create a new encryption object instance. | |
PCypher (const void *keyData, PINDEX keyLength, PINDEX blockSize, BlockChainMode chainMode) | |
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PObject () | |
Constructor for PObject, made protected so cannot ever create one on its own. |
Additional Inherited Members | |
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enum | BlockChainMode { ElectronicCodebook, ECB = ElectronicCodebook, CypherBlockChaining, CBC = CypherBlockChaining, OutputFeedback, OFB = OutputFeedback, CypherFeedback, CFB = CypherFeedback, NumBlockChainModes } |
Mechanism by which sequential blocks are linked. More... | |
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PBYTEArray | key |
Key for the encryption/decryption. | |
PINDEX | blockSize |
Size of each encryption block in bytes. | |
BlockChainMode | chainMode |
Mode for sequential encryption each block. | |
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Tiny Encryption Algorithm.
This class implements the Tiny Encryption Algorithm by David Wheeler and Roger Needham at Cambridge University.
This is a simple algorithm using a 128 bit binary key and encrypts data in 64 bit blocks.
PTEACypher::PTEACypher | ( | BlockChainMode | chainMode = ElectronicCodebook | ) |
Create a new TEA encryption object instance.
The parameterless version automatically generates a new, random, key.
chainMode | Block chain mode |
PTEACypher::PTEACypher | ( | const Key & | keyData, |
BlockChainMode | chainMode = ElectronicCodebook |
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keyData | Key for the encryption/decryption algorithm. |
chainMode | Block chain mode |
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protectedvirtual |
Decode an n bit block of memory according to the encryption algorithm.
in | Pointer to coded n bit block. |
out | Pointer to clear n bit block. |
Implements PCypher.
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protectedvirtual |
Encode an n bit block of memory according to the encryption algorithm.
in | Pointer to clear n bit block. |
out | Pointer to coded n bit block. |
Implements PCypher.
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static |
Generate a new key suitable for use for encryption using random data.
newKey | Variable to take the newly generated key. |
void PTEACypher::GetKey | ( | Key & | newKey | ) | const |
Get the key used by this encryption method.
newKey | Variable to take the key used by cypher. |
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protectedvirtual |
Initialise the encoding/decoding sequence.
encoding | Flag for encoding/decoding sequence about to start. |
Implements PCypher.
void PTEACypher::SetKey | ( | const Key & | newKey | ) |
Set the key used by this encryption method.
newKey | Variable to take the key used by cypher. |