Crypto++
5.6.5
Free C++ class library of cryptographic schemes
|
Base class for additive stream ciphers. More...
Public Types | |
typedef WT | WordType |
Public Member Functions | |
unsigned int | GetAlignment () const |
Provides data alignment requirements. More... | |
unsigned int | GetBytesPerIteration () const |
Provides number of bytes operated upon during an iteration. More... | |
unsigned int | GetIterationsToBuffer () const |
Provides buffer size based on iterations. More... | |
bool | CanOperateKeystream () const |
Flag indicating. More... | |
virtual void | OperateKeystream (KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)=0 |
Operates the keystream. More... | |
![]() | |
virtual unsigned int | GetOptimalBlockSize () const |
Provides number of ideal bytes to process. More... | |
virtual void | WriteKeystream (byte *keystream, size_t iterationCount) |
Generate the keystream. More... | |
virtual void | CipherSetKey (const NameValuePairs ¶ms, const byte *key, size_t length)=0 |
Key the cipher. More... | |
virtual void | CipherResynchronize (byte *keystreamBuffer, const byte *iv, size_t length) |
Resynchronize the cipher. More... | |
virtual bool | CipherIsRandomAccess () const =0 |
Flag indicating random access. More... | |
virtual void | SeekToIteration (lword iterationCount) |
Seeks to a random position in the stream. More... | |
Static Public Attributes | |
static const int | BYTES_PER_ITERATION = sizeof(WordType) * W |
Base class for additive stream ciphers.
WT | word type |
W | count of words |
X | bytes per iteration count |
BASE | AdditiveCipherAbstractPolicy derived base class |
Definition at line 188 of file strciphr.h.
|
inlinevirtual |
Provides data alignment requirements.
Internally, the default implementation returns 1. If the stream cipher is implemented using an SSE2 ASM or intrinsics, then the value returned is usually 16.
Reimplemented from AdditiveCipherAbstractPolicy.
Definition at line 198 of file strciphr.h.
|
inlinevirtual |
Provides number of bytes operated upon during an iteration.
Implements AdditiveCipherAbstractPolicy.
Definition at line 204 of file strciphr.h.
|
inlinevirtual |
Provides buffer size based on iterations.
Implements AdditiveCipherAbstractPolicy.
Definition at line 208 of file strciphr.h.
|
inlinevirtual |
Flag indicating.
Reimplemented from AdditiveCipherAbstractPolicy.
Definition at line 213 of file strciphr.h.
|
pure virtual |
Operates the keystream.
operation | the operation with additional flags |
output | the output buffer |
input | the input buffer |
iterationCount | the number of iterations to perform on the input |
OperateKeystream() will attempt to operate upon GetOptimalBlockSize() buffer, which will be derived from GetBytesPerIteration().
Reimplemented from AdditiveCipherAbstractPolicy.