Security Scol plugin
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Hardware generated random numbers using DARN instruction. More...
#include <darn.h>
Public Member Functions | |
CRYPTOPP_STATIC_CONSTEXPR const char * | StaticAlgorithmName () |
DARN () | |
Construct a DARN generator. | |
virtual void | GenerateBlock (byte *output, size_t size) |
Generate random array of bytes. | |
virtual void | DiscardBytes (size_t n) |
Generate and discard n bytes. | |
virtual void | IncorporateEntropy (const byte *input, size_t length) |
Update RNG state with additional unpredictable values. | |
std::string | AlgorithmProvider () const |
Retrieve the provider of this algorithm. | |
Public Member Functions inherited from RandomNumberGenerator | |
virtual bool | CanIncorporateEntropy () const |
Determines if a generator can accept additional entropy. | |
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 | GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length) |
Generate random bytes into a BufferedTransformation. | |
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. | |
Hardware generated random numbers using DARN instruction.
DARN() provides access to Power9's random number generator. The Crypto++ implementation provides conditioned random numbers from the generator as opposed to raw random numbers. According to Power ISA 3.0B manual, a conditioned random number has been processed by hardware to reduce bias. A raw random number is unconditioned noise source output.
According to Power ISA 3.0B manual, the random number generator provided by the darn
instruction is NIST SP800-90B and SP800-90C compliant to the extent possible given the completeness of the standards at the time the hardware is designed. The random number generator provides a minimum of 0.5 bits of entropy per bit.
DARN::DARN | ( | ) |
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inlinevirtual |
Retrieve the provider of this algorithm.
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".
Reimplemented from Algorithm.
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virtual |
Generate and discard n bytes.
n | the number of bytes to generate and discard |
the RDSEED generator discards words, not bytes. If n is not a multiple of a machine word, then it is rounded up to that size.
Reimplemented from RandomNumberGenerator.
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virtual |
Generate random array of bytes.
output | the byte buffer |
size | the length of the buffer, in bytes |
Reimplemented from RandomNumberGenerator.
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inlinevirtual |
Update RNG state with additional unpredictable values.
input | unused |
length | unused |
The operation is a nop for this generator.
Reimplemented from RandomNumberGenerator.
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inline |