Crypto++
5.6.3
Free C++ class library of cryptographic schemes
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Automatically Seeded X9.17 RNG. More...
Public Member Functions | |
AutoSeededX917RNG (bool blocking=false, bool autoSeed=true) | |
Construct an AutoSeededX917RNG. More... | |
void | Reseed (bool blocking=false, const byte *additionalEntropy=NULL, size_t length=0) |
Reseed an AutoSeededX917RNG. More... | |
void | Reseed (const byte *key, size_t keylength, const byte *seed, const byte *timeVector) |
Deterministically reseed an AutoSeededX917RNG for testing. More... | |
bool | CanIncorporateEntropy () const |
Determines if a generator can accept additional entropy. More... | |
void | IncorporateEntropy (const byte *input, size_t length) |
Update RNG state with additional unpredictable values. More... | |
void | GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length) |
Generate random bytes into a BufferedTransformation. 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... | |
Automatically Seeded X9.17 RNG.
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.
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inlineexplicit |
Construct an AutoSeededX917RNG.
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.
void AutoSeededX917RNG< BLOCK_CIPHER >::Reseed | ( | bool | blocking = false , |
const byte * | additionalEntropy = NULL , |
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size_t | length = 0 |
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Reseed an AutoSeededX917RNG.
blocking | controls seeding with BlockingRng or NonblockingRng |
additionalEntropy | 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.
Definition at line 213 of file osrng.h.
References IteratedHashWithStaticTransform< T_HashWordType, T_Endianness, T_BlockSize, T_StateSize, T_Transform, T_DigestSize, T_StateAligned >::DigestSize(), OS_GenerateRandomBlock(), SecBlock< T, A >::size(), STDMIN(), and UnsignedMin().
void AutoSeededX917RNG< BLOCK_CIPHER >::Reseed | ( | const byte * | key, |
size_t | keylength, | ||
const byte * | seed, | ||
const byte * | timeVector | ||
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Deterministically reseed an AutoSeededX917RNG for testing.
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.
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inlinevirtual |
Determines if a generator can accept additional entropy.
Reimplemented from RandomNumberGenerator.
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inlinevirtual |
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 from RandomNumberGenerator.
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inlinevirtual |
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.
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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::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.