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Done by a perl script which converted all classes to final, followed
by selective reversion where it caused compilation failures.
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ISO C++ reserves names with double underscores in them
Closes #512
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Defined in build.h, all equal to BOTAN_DLL so ties into existing
system for exporting symbols.
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Renames a couple of functions for somewhat better name consistency,
eg make_u32bit becomes make_uint32. The old typedefs remain for now
since probably lots of application code uses them.
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Change reseed interval logic to count calls to `randomize` rather than
bytes, to match SP 800-90A
Changes RNG reseeding API: there is no implicit reference to the
global entropy sources within the RNGs anymore. The entropy sources
must be supplied with the API call. Adds support for reseding directly
from another RNG (such as a system or hardware RNG).
Stateful_RNG keeps optional references to both an RNG and a set of
entropy sources. During a reseed, both sources are used if set.
These can be provided to HMAC_DRBG constructor.
For HMAC_DRBG, SP800-90A requires we output no more than 2**16 bytes
per DRBG request. We treat requests longer than that as if the caller
had instead made several sequential maximum-length requests. This
means it is possible for one or more reseeds to trigger even in the
course of generating a single (long) output (generate a 256-bit key
and use ChaCha or HKDF if this is a problem).
Adds RNG::randomize_with_ts_input which takes timestamps and uses them
as the additional_data DRBG field. Stateful_RNG overrides this to also
include the process ID and the reseed counter. AutoSeeded_RNG's
`randomize` uses this.
Officially deprecates RNG::make_rng and the Serialized_RNG construtor
which creates an AutoSeeded_RNG. With these removed, it would be
possible to perform a build with no AutoSeeded_RNG/HMAC_DRBG at all
(eg, for applications which only use the system RNG).
Tests courtesy @cordney in GH PRs #598 and #600
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Add support and tests for additional_data param to HMAC_DRBG
Add Stateful_RNG class which has fork detection and periodic reseeding.
AutoSeeded_RNG passes the current pid and time as additional_data
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This lets you amortize quite a few memory allocations (RNG, various
BigInts, etc) over many nonce generations.
Change generate_rfc6979_nonce to just instantiate one of these states,
call the function once, and return. This doesn't have any additional
overhead versus the previous implementation of this function.
Fix HMAC_DRBG to correctly reset its state to its starting position
when you call clear() on it.
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Fix two memory leaks (in TLS and modes) caused by calling get_foo and
then cloning the result before saving it (leaking the original object),
a holdover from the conversion between construction techniques in 1.11.14
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Convert all uses of Algorithm_Factory and the engines to using Algo_Registry
The shared pool of entropy sources remains but is moved to EntropySource.
With that and few remaining initializations (default OIDs and aliases)
moved elsewhere, the global state is empty and init and shutdown are no-ops.
Remove almost all of the headers and code for handling the global
state, except LibraryInitializer which remains as a compatability stub.
Update seeding for blinding so only one hacky almost-global RNG
instance needs to be setup instead of across all pubkey uses (it uses
either the system RNG or an AutoSeeded_RNG if the system RNG is not
available).
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Update license header line to specify the terms and refer to the file,
neither of which it included before.
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Drop the GNU MP engine. Its implementations were potentially faster in
some scenarios but not well protected against side channels.
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