Automatically Seeded X9.17 RNG. More...
#include <osrng.h>
Inheritance diagram for AutoSeededX917RNG< BLOCK_CIPHER >:
Public Member Functions | |
| AutoSeededX917RNG (bool blocking=false, bool autoSeed=true) | |
| Construct an AutoSeededX917RNG. | |
| void | Reseed (bool blocking=false, const byte *input=NULL, size_t length=0) |
| Reseed an AutoSeededX917RNG. | |
| void | Reseed (const byte *key, size_t keylength, const byte *seed, const byte *timeVector) |
| Deterministically reseed an AutoSeededX917RNG for testing. | |
| bool | CanIncorporateEntropy () const |
| Determines if a generator can accept additional entropy. | |
| void | IncorporateEntropy (const byte *input, size_t length) |
| Update RNG state with additional unpredictable values. | |
| void | GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length) |
| Generate random bytes into a BufferedTransformation. | |
| std::string | AlgorithmProvider () const |
| Retrieve the provider of this algorithm. | |
| Public Member Functions inherited from RandomNumberGenerator | |
| virtual byte | GenerateByte () |
| Generate new random byte and return it. | |
| virtual unsigned int | GenerateBit () |
| Generate new random bit and return it. | |
| virtual word32 | GenerateWord32 (word32 min=0, word32 max=0xffffffffUL) |
| Generate a random 32 bit word in the range min to max, inclusive. | |
| virtual void | GenerateBlock (byte *output, size_t size) |
| Generate random array of bytes. | |
| virtual void | DiscardBytes (size_t n) |
| Generate and discard n bytes. | |
| template<class IT > | |
| void | Shuffle (IT begin, IT end) |
| Randomly shuffle the specified array. | |
| Public Member Functions inherited from Algorithm | |
| Algorithm (bool checkSelfTestStatus=true) | |
| Interface for all crypto algorithms. | |
| virtual std::string | AlgorithmName () const |
| Provides the name of this algorithm. | |
| Public Member Functions inherited from Clonable | |
| virtual Clonable * | Clone () const |
| Copies this object. | |
Static Public Member Functions | |
| static std::string | StaticAlgorithmName () |
Detailed Description
class AutoSeededX917RNG< BLOCK_CIPHER >
Automatically Seeded X9.17 RNG.
- Template Parameters
-
BLOCK_CIPHER a block cipher
AutoSeededX917RNG is from ANSI X9.17 Appendix C, seeded using an OS provided RNG. If 3-key TripleDES (DES_EDE3) is used, then its a X9.17 conforming generator. If AES is used, then its a X9.31 conforming generator.
Though ANSI X9 prescribes 3-key TripleDES, the template parameter BLOCK_CIPHER can be any BlockTransformation derived class.
You should reseed the generator after a fork() to avoid multiple generators with the same internal state.
- See also
- X917RNG, DefaultAutoSeededRNG
Constructor & Destructor Documentation
◆ ~AutoSeededX917RNG()
|
inline |
◆ AutoSeededX917RNG()
|
inlineexplicit |
Construct an AutoSeededX917RNG.
- Parameters
-
blocking controls seeding with BlockingRng or NonblockingRng autoSeed controls auto seeding of the generator
Use blocking to choose seeding with BlockingRng or NonblockingRng. The parameter is ignored if only one of these is available.
- See also
- X917RNG
Member Function Documentation
◆ StaticAlgorithmName()
|
inlinestatic |
◆ Reseed() [1/2]
| void AutoSeededX917RNG< BLOCK_CIPHER >::Reseed | ( | bool | blocking = false, |
| const byte * | input = NULL, | ||
| size_t | length = 0 ) |
Reseed an AutoSeededX917RNG.
- Parameters
-
blocking controls seeding with BlockingRng or NonblockingRng input additional entropy to add to the generator length the size of the additional entropy, in bytes
Internally, the generator uses SHA256 to extract the entropy from from the seed and then stretch the material for the block cipher's key and initialization vector.
◆ Reseed() [2/2]
| void AutoSeededX917RNG< BLOCK_CIPHER >::Reseed | ( | const byte * | key, |
| size_t | keylength, | ||
| const byte * | seed, | ||
| const byte * | timeVector ) |
Deterministically reseed an AutoSeededX917RNG for testing.
- Parameters
-
key the key to use for the deterministic reseeding keylength the size of the key, in bytes seed the seed to use for the deterministic reseeding timeVector a time vector to use for deterministic reseeding
This is a testing interface for testing purposes, and should NOT be used in production.
◆ CanIncorporateEntropy()
|
inlinevirtual |
Determines if a generator can accept additional entropy.
- Returns
- true if IncorporateEntropy() is implemented
Reimplemented from RandomNumberGenerator.
◆ IncorporateEntropy()
|
inlinevirtual |
Update RNG state with additional unpredictable values.
- Parameters
-
input the entropy to add to the generator length the size of the input buffer
- Exceptions
-
NotImplemented
A generator may or may not accept additional entropy. Call CanIncorporateEntropy() to test for the ability to use additional entropy.
If a derived class does not override IncorporateEntropy(), then the base class throws NotImplemented.
Reimplemented from RandomNumberGenerator.
◆ GenerateIntoBufferedTransformation()
|
inlinevirtual |
Generate random bytes into a BufferedTransformation.
- Parameters
-
target the BufferedTransformation object which receives the bytes channel the channel on which the bytes should be pumped length the number of bytes to generate
The default implementation calls GenerateBlock() and pumps the result into the DEFAULT_CHANNEL of the target.
All generated values are uniformly distributed over the range specified within the the constraints of a particular generator.
- Note
- A derived generator must override either GenerateBlock() or GenerateIntoBufferedTransformation(). They can override both, or have one call the other.
Reimplemented from RandomNumberGenerator.
◆ AlgorithmProvider()
|
virtual |
Retrieve the provider of this algorithm.
- Returns
- the algorithm provider
The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI", "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE, usually indicate a specialized implementation using instructions from a higher instruction set architecture (ISA). Future labels may include external hardware like a hardware security module (HSM).
Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2". Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics instead of ASM.
Algorithms which combine different instructions or ISAs provide the dominant one. For example on x86 AES/GCM returns "AESNI" rather than "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".
- Note
- Provider is not universally implemented yet.
- Since
- Crypto++ 8.0
Reimplemented from Algorithm.
The documentation for this class was generated from the following file:
