Crypto++
5.6.3
Free C++ class library of cryptographic schemes
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ANSI X9.17 RNG. More...
Public Member Functions | |
X917RNG (BlockTransformation *cipher, const byte *seed, const byte *deterministicTimeVector=0) | |
Construct a X917RNG. More... | |
void | GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword size) |
Generate random bytes into a BufferedTransformation. More... | |
virtual void | IncorporateEntropy (const byte *input, size_t length) |
Update RNG state with additional unpredictable values. More... | |
virtual bool | CanIncorporateEntropy () const |
Determines if a generator can accept additional entropy. More... | |
virtual byte | GenerateByte () |
Generate new random byte and return it. More... | |
virtual unsigned int | GenerateBit () |
Generate new random bit and return it. More... | |
virtual word32 | GenerateWord32 (word32 min=0, word32 max=0xffffffffUL) |
Generate a random 32 bit word in the range min to max, inclusive. More... | |
virtual void | GenerateBlock (byte *output, size_t size) |
Generate random array of bytes. More... | |
virtual void | DiscardBytes (size_t n) |
Generate and discard n bytes. More... | |
template<class IT > | |
void | Shuffle (IT begin, IT end) |
Randomly shuffle the specified array. More... | |
virtual std::string | AlgorithmName () const |
Provides the name of this algorithm. More... | |
virtual Clonable * | Clone () const |
Copies this object. More... | |
ANSI X9.17 RNG.
X917RNG is from ANSI X9.17 Appendix C.
X917RNG::X917RNG | ( | BlockTransformation * | cipher, |
const byte * | seed, | ||
const byte * | deterministicTimeVector = 0 |
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Construct a X917RNG.
cipher | the block cipher to use for the generator |
seed | a byte buffer to use as a seed |
deterministicTimeVector | additional entropy |
cipher
will be deleted by the destructor. seed
must be at least BlockSize() in length. deterministicTimeVector = 0
means obtain time vector from the system.
When constructing an AutoSeededX917RNG, the generator must be keyed or an access violation will occur because the time vector is encrypted using the block cipher. To key the generator during constructions, perform the following:
SecByteBlock key(AES::DEFAULT_KEYLENGTH), seed(AES::BLOCKSIZE); OS_GenerateRandomBlock(false, key, key.size()); OS_GenerateRandomBlock(false, seed, seed.size()); X917RNG prng(new AES::Encryption(key, AES::DEFAULT_KEYLENGTH), seed, NULL);
Definition at line 61 of file rng.cpp.
References RandomNumberGenerator::GenerateBlock(), BlockTransformation::ProcessBlock(), UnsignedMin(), and xorbuf().
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virtual |
Generate random bytes into a BufferedTransformation.
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 contraints of a particular generator.
Reimplemented from RandomNumberGenerator.
Definition at line 83 of file rng.cpp.
References BufferedTransformation::ChannelPut(), IncrementCounterByOne(), BlockTransformation::ProcessBlock(), SecBlock< T, A >::size(), UnsignedMin(), and xorbuf().
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inlinevirtualinherited |
Update RNG state with additional unpredictable values.
input | the entropy to add to the generator |
length | the size of the input buffer |
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 in ClassNullRNG, AutoSeededX917RNG< BLOCK_CIPHER >, RDSEED, RDRAND, and RandomPool.
Definition at line 1096 of file cryptlib.h.
Referenced by DL_SignerBase< SCHEME_OPTIONS::Element >::SignAndRestart().
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inlinevirtualinherited |
Determines if a generator can accept additional entropy.
Reimplemented in ClassNullRNG, AutoSeededX917RNG< BLOCK_CIPHER >, and RandomPool.
Definition at line 1104 of file cryptlib.h.
Referenced by DL_SignerBase< SCHEME_OPTIONS::Element >::SignAndRestart().
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virtualinherited |
Generate new random byte and return it.
Default implementation calls GenerateBlock() with one byte.
All generated values are uniformly distributed over the range specified within the the contraints of a particular generator.
Reimplemented in ClassNullRNG, and PublicBlumBlumShub.
Definition at line 294 of file cryptlib.cpp.
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virtualinherited |
Generate new random bit and return it.
The default implementation calls GenerateByte() and return its lowest bit.
All generated values are uniformly distributed over the range specified within the the contraints of a particular generator.
Reimplemented in ClassNullRNG, and PublicBlumBlumShub.
Definition at line 289 of file cryptlib.cpp.
Referenced by TestDataNameValuePairs::GetVoidValue().
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virtualinherited |
Generate a random 32 bit word in the range min to max, inclusive.
min | the lower bound of the range |
max | the upper bound of the range |
The default implementation calls Crop() on the difference between max and min, and then returns the result added to min.
All generated values are uniformly distributed over the range specified within the the contraints of a particular generator.
Reimplemented in ClassNullRNG, and MersenneTwister< K, M, N, F, S >.
Definition at line 301 of file cryptlib.cpp.
References BitPrecision(), and Crop().
Referenced by MaurerProvablePrime(), PKCS_EncryptionPaddingScheme::MaxUnpaddedLength(), MihailescuProvablePrime(), and FilterTester::Put2().
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virtualinherited |
Generate random array of bytes.
output | the byte buffer |
size | the length of the buffer, in bytes |
All generated values are uniformly distributed over the range specified within the the contraints of a particular generator.
Reimplemented in KDF2_RNG, ClassNullRNG, RDSEED, AdditiveCipherTemplate< BASE >, AdditiveCipherTemplate< AbstractPolicyHolder< AdditiveCipherAbstractPolicy, CTR_ModePolicy > >, BlockingRng, NonblockingRng, RDRAND, FixedRNG, MersenneTwister< K, M, N, F, S >, Weak::ARC4_Base, LC_RNG, and PublicBlumBlumShub.
Definition at line 329 of file cryptlib.cpp.
Referenced by FixedRNG::GenerateBlock(), SimpleKeyingInterface::GetNextIV(), OAEP_Base::MaxUnpaddedLength(), PolynomialMod2::PolynomialMod2(), FilterTester::Put2(), Integer::Randomize(), and X917RNG().
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virtualinherited |
Generate and discard n bytes.
n | the number of bytes to generate and discard |
Reimplemented in ClassNullRNG, RDSEED, MersenneTwister< K, M, N, F, S >, RDRAND, and Weak::ARC4_Base.
Definition at line 342 of file cryptlib.cpp.
References TheBitBucket().
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inlineinherited |
Randomly shuffle the specified array.
begin | an iterator to the first element in the array |
end | an iterator beyond the last element in the array |
The resulting permutation is uniformly distributed.
Definition at line 1159 of file cryptlib.h.
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inlinevirtualinherited |
Provides the name of this algorithm.
The standard algorithm name can be a name like AES or AES/GCM. Some algorithms do not have standard names yet. For example, there is no standard algorithm name for Shoup's ECIES.
Reimplemented in AuthenticatedSymmetricCipher, SignatureVerificationFilter, SignerFilter, AuthenticatedDecryptionFilter, HashVerificationFilter, HashFilter, StreamTransformationFilter, ClassNullRNG, BitBucket, RDSEED, DH_Domain< GROUP_PARAMETERS, COFACTOR_OPTION >, HMAC< T >, RDRAND, CRC32, GCM_Base, Adler32, EAX_Base, CCM_Base, SHA3, and VMAC_Base.
Definition at line 488 of file cryptlib.h.
Referenced by VariableRounds< 6, 2 >::StaticGetDefaultRounds().
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inlinevirtualinherited |
Copies this object.
NotImplemented |
Definition at line 464 of file cryptlib.h.