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With these fixes the implementation is now compatible with bouncycastle and it should operate
as it is specified in "DHIES: An encryption scheme based on Diffie-Hellman Problem" or in BSI
technical guideline TR-02102-1.
In addition to the already present XOR-encrypion/decryption mode it's now possible to use DLIES with a block cipher.
Previously the input to the KDF was the concatenation of the (ephemeral) public key
and the secret value derived by the key agreement operation:
```
secure_vector<byte> vz(m_my_key.begin(), m_my_key.end());
vz += m_ka.derive_key(0, m_other_key).bits_of();
const size_t K_LENGTH = length + m_mac_keylen;
secure_vector<byte> K = m_kdf->derive_key(K_LENGTH, vz);
```
I don't know why this was implemented like this. But now the input to the KDF is only the secret value obtained by the key agreement operation.
Furthermore the order of the output was changed from {public key, tag, ciphertext} to {public key, ciphertext, tag}.
Multiple test vectors added that were generated with bouncycastle and some with botan itself.
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Performs content checks on the value (expected length, expected bytes)
and in constant time returns either the decrypted value or a random value.
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A module policy is a file specifying three types of modules: ones which
are required, ones which are prohibited, and ones which should be used
if otherwise available (this is mostly for platform specific modules).
Finally there are whatever modules which exist in the library of which
the policy makes no mention. These will be included if an explicit
dependency of some other module pulls them in (so there is no reason
to mention base, utils, ... in the file) but skipped otherwise.
For example policy 'sane' does not mention 'utils' or 'twofish' either
way. Since utils is a dependency of other modules which are included,
but Twofish does not. However unlike an explicitly prohibited module,
not mentioned can still be requested as part of the build (here with
--enable-module=twofish)
Also fixes some test bugs noticed by compiling in different build
configs. DLIES test didn't check that the KDF and MAC existed. Adds a
typedef for MessageAuthenticationCode because typing it twice in a
single line in the DLIES test made me think it's way too long. :) Also
fix some fuzzer build problems. Due to a copy and paste bug the PKCS
certificate (it was not).
Inspired by GH #439
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Only user-visible change is the removal of get_byte.h
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higher level functions on interface handling returning a vector.
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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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