Change-Id: I862c1f90580f32d99d9cf4c44430f749801a0574
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: afd20aad283aaae1741e368d7f19208f2291eca7

Change-Id: I8f43da36630342ed9c12a7b614103873167e7b2f
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: 05460736595ab88a50919cc18e7226a4c4bc483f

TINKHybridDecrypt: Public protocol that describes the functions implemented by
    the crypto primitives returned by TINKHybridDecryptFactory. The developer
    will use TINKHybridDecryptFactory to get a primitive that conforms to this
    protocol.

TINKHybridDecryptConfig: Public configuration interface. The user creates an
    instance and uses it to configure the TINKHybridDecryptFactory.

TINKHybridDecryptFactory: Public Factory that returns the crypto primitives.
    This is the only way to get a crypto primitive (TINKHybridDecrypt).

TINKHybridDecryptInternal: Internal-only class that's used to implement the
    crypto primitives. The user is not allowed to use this class to create a
    crypto primitive. Instead he should use the TINKHybridDecryptFactory. This
    class conforms to the public protocol TINKHybridDecrypt.

TINKHybridDecryptKeyManager: Parent class of all HybridDecrypt key managers.
    Doesn't contain any functionality we just use it to restrict the type of
    customKeyManagers that can be accepted by TINKHybridDecryptConfig.

TINKPBEciesAeadHkdfPrivateKeyManager:
TINKPBEciesAeadHkdfPublicKeyManager: These are both custom key managers that
    can be used with the TINKHyrbidDecryptConfig. After syncing with Thai these
    might not be needed as the user will have to implement and supply his own
    custom key managers.

Change-Id: I006ab7ea705bb913e068baf892981c1dc4f7cfb5
ORIGINAL_AUTHOR=Haris Andrianakis <candrian@google.com>
GitOrigin-RevId: 4a03068d668054fb314264c3e137bdec5a06b07b

The Android flavor uses protobuf lite, does not support GCP KMS (which
does not run on Android yet). It'll also include Android-specific stuff.

The main flavor uses protobuf full and includes everything.

Change-Id: I1b271171dad8eb31aba0aef0308be1f30cf96966
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: 8db6f588e19b4cebe624655e1f5b9184f9bbcaf2

Change-Id: I698ef088b780175d8eb66379566ca8adc5ed0861
ORIGINAL_AUTHOR=Haris Andrianakis <candrian@google.com>
GitOrigin-RevId: 27aefa5dce01c4f5bec68a8c3bd898d8b637d098

Change-Id: I7822198a4257a81db34231d1c4d416f87fb9b65a
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: e38021ac0481d7c14f68778d60468e66767a91d6

ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: 7630dd48704d7afd8708b08d2c36cd4d8abfe0d8

Change-Id: I0377e32aea55c3e85a40bc64eddf45c52846cac6
ORIGINAL_AUTHOR=Bartosz Przydatek <przydatek@google.com>

GitOrigin-RevId: c80cbaaf25e74ab8a7595e5192628d0f5d993a4c

- Directory structure follows TensorFlow.
- Rules for protobuf building are based on https://github.com/pubref/rules_protobuf, as I can't find anything simpler.
- Continuous integration with Kokoro (work in progress).

I also copied some existing Java/CC code from Bartosz and Daniel's experimental folders.

Change-Id: I7f993934d149c114320e3388fee84fbdafd7ba81