PrfAesCmac

java.lang.Object
- com.google.crypto.tink.prf.internal.PrfAesCmac

All Implemented Interfaces:: Prf

@Immutable
public final class PrfAesCmac
extends java.lang.Object
implements Prf

An implementation of CMAC following RFC 4493.

Field Summary

Fields
Modifier and Type Field Description

static TinkFipsUtil.AlgorithmFipsCompatibility FIPS

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`compute(byte[] data, int outputLength)`	Computes the PRF selected by the underlying key on input and returns the first outputLength bytes.
`static Prf`	`create(AesCmacPrfKey key)`

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

- Field Detail
  - FIPS
```
public static final TinkFipsUtil.AlgorithmFipsCompatibility FIPS
```
- Method Detail
  - create
```
public static Prf create(AesCmacPrfKey key)
                  throws java.security.GeneralSecurityException
```
    Throws:
    
    java.security.GeneralSecurityException
  - compute
```
public byte[] compute(byte[] data,
                      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:
    
    data - 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.