Base class for additive stream ciphers. More...
Inheritance diagram for AdditiveCipherConcretePolicy< WT, W, X, BASE >:
Public Types | |
| typedef WT | WordType |
| Word type for the cipher. | |
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... | |
Static Public Attributes | |
| static const int | BYTES_PER_ITERATION = sizeof(WordType) * W |
| Number of bytes for an iteration. More... | |
Detailed Description
template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>
struct AdditiveCipherConcretePolicy< WT, W, X, BASE >
Base class for additive stream ciphers.
- Template Parameters
-
WT word type W count of words X bytes per iteration count BASE AdditiveCipherAbstractPolicy derived base class
Definition at line 201 of file strciphr.h.
Member Function Documentation
◆ GetAlignment()
|
inline |
Provides data alignment requirements.
- Returns
- data alignment requirements, in bytes
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.
Definition at line 221 of file strciphr.h.
◆ GetBytesPerIteration()
|
inline |
Provides number of bytes operated upon during an iteration.
- Returns
- bytes operated upon during an iteration, in bytes
- See also
- GetOptimalBlockSize()
Definition at line 227 of file strciphr.h.
◆ GetIterationsToBuffer()
|
inline |
Provides buffer size based on iterations.
- Returns
- the buffer size based on iterations, in bytes
Definition at line 231 of file strciphr.h.
◆ CanOperateKeystream()
|
inline |
Flag indicating.
- Returns
- true if the stream can be generated independent of the transformation input, false otherwise
- See also
- CanOperateKeystream(), OperateKeystream(), WriteKeystream()
Definition at line 237 of file strciphr.h.
◆ OperateKeystream()
|
pure virtual |
Operates the keystream.
- Parameters
-
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().
- See also
- CanOperateKeystream(), OperateKeystream(), WriteKeystream(), KeystreamOperation()
Member Data Documentation
◆ BYTES_PER_ITERATION
|
static |
Number of bytes for an iteration.
BYTES_PER_ITERATION is the product sizeof(WordType) * W. For example, ChaCha uses 16 each word32, and the value of BYTES_PER_ITERATION is 64. Each invocation of the ChaCha block function produces 64 bytes of keystream.
Definition at line 211 of file strciphr.h.
The documentation for this struct was generated from the following file:
