MongoKeyDecryptor (mongocrypt 1.5.2 API)

```
public interface MongoKeyDecryptor
```
An interface representing a key decryption operation using a key management service.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`bytesNeeded()`	Gets the number of bytes that should be received from the KMS server.
`void`	`feed(java.nio.ByteBuffer bytes)`	Feed the received bytes to the decryptor.
`java.lang.String`	`getHostName()`	Gets the host name of the key management service.
`java.lang.String`	`getKmsProvider()`	Gets the name of the KMS provider, e.g.
`java.nio.ByteBuffer`	`getMessage()`	Gets the message to send to the key management service.

- Method Detail
  - getKmsProvider
```
java.lang.String getKmsProvider()
```
    Gets the name of the KMS provider, e.g. "aws" or "kmip"
    
    Returns:
    
    the KMS provider name
  - getHostName
```
java.lang.String getHostName()
```
    Gets the host name of the key management service.
    
    Returns:
    
    the host name
  - getMessage
```
java.nio.ByteBuffer getMessage()
```
    Gets the message to send to the key management service.
    Clients should call this method first, and send the message on a TLS connection to a configured KMS server.
    
    Returns:
    
    the message to send
  - bytesNeeded
```
int bytesNeeded()
```
    Gets the number of bytes that should be received from the KMS server.
    After sending the message to the KMS server, clients should call this method in a loop, receiving bytesNeeded from the KMS server and feeding those bytes to this decryptor, until bytesNeeded is 0.
    
    Returns:
    
    the actual number of bytes that clients should be prepared receive
  - feed
```
void feed(java.nio.ByteBuffer bytes)
```
    Feed the received bytes to the decryptor.
    After sending the message to the KMS server, clients should call this method in a loop, receiving the number of bytes indicated by a call to bytesNeeded() from the KMS server and feeding those bytes to this decryptor, until bytesNeeded() returns 0.
    
    Parameters:
    
    bytes - the received bytes