PrfImpl

java.lang.Object
- com.google.crypto.tink.subtle.prf.PrfImpl

All Implemented Interfaces:

Prf
```
@Immutable
public class PrfImpl
extends java.lang.Object
implements Prf
```
Class that implements the Prf primitive by wrapping a StreamingPrf.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`compute(byte[] input, int outputLength)`	Computes the PRF selected by the underlying key on input and returns the first outputLength bytes.
`static PrfImpl`	`wrap(StreamingPrf prfStreamer)`	Creates a Prf primitive from a StreamingPrf primitive.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - wrap
```
public static PrfImpl wrap(StreamingPrf prfStreamer)
```
    Creates a Prf primitive from a StreamingPrf primitive.
  - compute
```
public byte[] compute(byte[] input,
                      int outputLength)
               throws java.security.GeneralSecurityException
```
    Description copied from interface: Prf
    
    Computes the PRF selected by the underlying key on input and returns the first outputLength bytes.
    
    Specified by:
    
    compute in interface Prf
    
    Parameters:
    
    input - the input to compute the PRF on.
    
    outputLength - the desired length of the output in bytes. When choosing this parameter keep the birthday paradox in mind. If you have 2^n different inputs that your system has to handle set the output length to ceil(n/4 + 4) This corresponds to 2*n + 32 bits, meaning a collision will occur with a probability less than 1:2^32. When in doubt, request a security review.
    
    Throws:
    
    java.security.GeneralSecurityException - if the algorithm fails or if the output of algorithm is less than outputLength.