Botan
2.17.3
Crypto and TLS for C++11
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#include <processor_rng.h>
Public Member Functions | |
bool | accepts_input () const override |
void | add_entropy (const uint8_t[], size_t) override |
template<typename T > | |
void | add_entropy_T (const T &t) |
virtual void | clear () final override |
bool | is_seeded () const override |
std::string | name () const override |
uint8_t | next_byte () |
uint8_t | next_nonzero_byte () |
Processor_RNG () | |
secure_vector< uint8_t > | random_vec (size_t bytes) |
template<typename Alloc > | |
void | random_vec (std::vector< uint8_t, Alloc > &v, size_t bytes) |
void | randomize (uint8_t out[], size_t out_len) override |
virtual void | randomize_with_input (uint8_t output[], size_t output_len, const uint8_t input[], size_t input_len) |
virtual void | randomize_with_ts_input (uint8_t output[], size_t output_len) |
size_t | reseed (Entropy_Sources &, size_t, std::chrono::milliseconds) override |
virtual void | reseed_from_rng (RandomNumberGenerator &rng, size_t poll_bits=BOTAN_RNG_RESEED_POLL_BITS) |
Static Public Member Functions | |
static bool | available () |
static RandomNumberGenerator * | make_rng () |
Directly invokes a CPU specific instruction to generate random numbers. On x86, the RDRAND instruction is used. on POWER, the DARN instruction is used.
Definition at line 19 of file processor_rng.h.
Botan::Processor_RNG::Processor_RNG | ( | ) |
Constructor will throw if CPU does not have RDRAND bit set
Definition at line 140 of file processor_rng.cpp.
References available().
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inlineoverridevirtual |
Returns false if it is known that this RNG object is not able to accept externally provided inputs (via add_entropy, randomize_with_input, etc). In this case, any such provided inputs are ignored.
If this function returns true, then inputs may or may not be accepted.
Implements Botan::RandomNumberGenerator.
Definition at line 32 of file processor_rng.h.
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overridevirtual |
Incorporate some additional data into the RNG state. For example adding nonces or timestamps from a peer's protocol message can help hedge against VM state rollback attacks. A few RNG types do not accept any externally provided input, in which case this function is a no-op.
input | a byte array containg the entropy to be added |
length | the length of the byte array in |
Implements Botan::RandomNumberGenerator.
Definition at line 146 of file processor_rng.cpp.
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inlineinherited |
Incorporate some additional data into the RNG state.
Definition at line 69 of file rng.h.
References T.
Referenced by Botan::Win32_EntropySource::poll().
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static |
Return true if RNG instruction is available on the current processor
Definition at line 100 of file processor_rng.cpp.
Referenced by Botan::RDRAND_RNG::available(), botan_rng_init(), Botan::Entropy_Source::create(), and Processor_RNG().
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inlinefinaloverridevirtualinherited |
Clear all internally held values of this RNG
Implements Botan::RandomNumberGenerator.
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inlineoverridevirtual |
Check whether this RNG is seeded.
Implements Botan::RandomNumberGenerator.
Definition at line 33 of file processor_rng.h.
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staticinherited |
Create a seeded and active RNG object for general application use Added in 1.8.0 Use AutoSeeded_RNG instead
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overridevirtual |
Implements Botan::RandomNumberGenerator.
Definition at line 111 of file processor_rng.cpp.
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inlineinherited |
Return a random byte
Definition at line 161 of file rng.h.
Referenced by Botan::random_prime().
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inlineinherited |
Definition at line 171 of file rng.h.
Referenced by Botan::EME_PKCS1v15::pad().
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inlineinherited |
Return a random vector
bytes | number of bytes in the result |
Definition at line 143 of file rng.h.
Referenced by Botan::CECPQ1_accept(), Botan::CECPQ1_offer(), Botan::TLS::Client_Key_Exchange::Client_Key_Exchange(), Botan::Curve25519_PrivateKey::Curve25519_PrivateKey(), Botan::PK_Decryptor::decrypt_or_random(), Botan::Ed25519_PrivateKey::Ed25519_PrivateKey(), Botan::TLS::Session::encrypt(), Botan::KeyPair::encryption_consistency_check(), Botan::generate_bcrypt(), Botan::mceies_encrypt(), Botan::OctetString::OctetString(), Botan::BigInt::randomize(), and Botan::TLS::Session_Manager_In_Memory::remove_all().
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inlineinherited |
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overridevirtual |
Randomize a byte array.
output | the byte array to hold the random output. |
length | the length of the byte array output in bytes. |
Implements Botan::RandomNumberGenerator.
Definition at line 122 of file processor_rng.cpp.
References Botan::get_byte(), and Botan::store_le().
Referenced by Botan::RDRAND_RNG::randomize(), Botan::RDRAND_RNG::rdrand(), and Botan::RDRAND_RNG::rdrand_status().
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virtualinherited |
Incorporate entropy into the RNG state then produce output. Some RNG types implement this using a single operation, default calls add_entropy + randomize in sequence.
Use this to further bind the outputs to your current process/protocol state. For instance if generating a new key for use in a session, include a session ID or other such value. See NIST SP 800-90 A, B, C series for more ideas.
output | buffer to hold the random output |
output_len | size of the output buffer in bytes |
input | entropy buffer to incorporate |
input_len | size of the input buffer in bytes |
Reimplemented in Botan::Stateful_RNG, and Botan::AutoSeeded_RNG.
Definition at line 38 of file rng.cpp.
References Botan::RandomNumberGenerator::add_entropy(), and Botan::RandomNumberGenerator::randomize().
Referenced by Botan::RandomNumberGenerator::randomize_with_ts_input().
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virtualinherited |
This calls randomize_with_input
using some timestamps as extra input.
For a stateful RNG using non-random but potentially unique data the extra input can help protect against problems with fork, VM state rollback, or other cases where somehow an RNG state is duplicated. If both of the duplicated RNG states later incorporate a timestamp (and the timestamps don't themselves repeat), their outputs will diverge.
Reimplemented in Botan::Stateful_RNG.
Definition at line 18 of file rng.cpp.
References Botan::RandomNumberGenerator::accepts_input(), Botan::OS::get_high_resolution_clock(), Botan::OS::get_system_timestamp_ns(), Botan::RandomNumberGenerator::randomize(), Botan::RandomNumberGenerator::randomize_with_input(), and Botan::store_le().
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overridevirtual |
Poll provided sources for up to poll_bits bits of entropy or until the timeout expires. Returns estimate of the number of bits collected.
Reimplemented from Botan::RandomNumberGenerator.
Definition at line 151 of file processor_rng.cpp.
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virtualinherited |
Reseed by reading specified bits from the RNG
Reimplemented in Botan::Stateful_RNG.
Definition at line 59 of file rng.cpp.
References Botan::RandomNumberGenerator::accepts_input(), Botan::RandomNumberGenerator::add_entropy(), and Botan::RandomNumberGenerator::randomize().
Referenced by botan_rng_reseed(), botan_rng_reseed_from_rng(), and Botan::Stateful_RNG::reseed_from_rng().