Gets a key document

# MongoDB\Driver\ClientEncryption::getKey

(mongodb >=1.15.0)

MongoDB\Driver\ClientEncryption::getKey — Gets a key document

### Description

final public MongoDB\Driver\ClientEncryption::getKey(MongoDB\BSON\Binary `$keyId`): ?object

Finds a single key document in the key vault collection with the given UUID `keyId`.

### Parameters

`keyId`

  A MongoDB\BSON\Binary instance with subtype 4 (UUID) identifying the key document.

### Return Values

Returns the key document, or `null` if no document matched.

### Errors/Exceptions

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\ConnectionException if connection to the server fails (for reasons other than authentication).
- Throws MongoDB\Driver\Exception\AuthenticationException if authentication is needed and fails.
- Throws MongoDB\Driver\Exception\RuntimeException on other errors.

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