Provides a container for a set of cryptographic primitives.
It provides also additional properties for the primitives it holds. In
particular, one of the primitives in the set can be distinguished as "the
primary" one.
| Entry | Entry represents a single entry in the keyset. In addition to the actual
primitive, it holds the identifier and status of the primitive.
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| PrimitiveSet | PrimitiveSet is used for supporting key rotation: primitives in a set
correspond to keys in a keyset. Users will usually work with primitive
instances, which essentially wrap primitive sets. For example an instance of
an AEAD-primitive for a given keyset holds a set of AEAD-primitives
corresponding to the keys in the keyset, and uses the set members to do the
actual crypto operations: to encrypt data the primary AEAD-primitive from
the set is used, and upon decryption the ciphertext's prefix determines the
id of the primitive from the set.
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| TypedEntry | TypedEntry represents a single entry in a keyset for primitives of a known type. In addition
to the actual primitive, it holds the identifier and status of the primitive.
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| TypedPrimitiveSet | TypedPrimitiveSet is equivalent to PrimitiveSet but holds primitives
of a specific known type P.
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