KDFHmacSpec (Java Card API, Classic Edition)

All Superinterfaces:

AlgorithmParameterSpec
```
public interface KDFHmacSpec
extends AlgorithmParameterSpec
```
This interface specifies the set of parameters used to instantiate a DerivationFunction implementing the HKDF Key Derivation function defined in in IETF RFC 5869.
This interface is bound to the constant DerivationFunction.ALG_KDF_HKDF.

Since:

3.1

See Also:

DerivationFunction

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`byte`	`getAlgorithm()`	Returns the HMAC Algorithm associated with the derivation function.
`byte[]`	`getInfo()`	Gets the info.
`short`	`getOutputLength()`	Returns the KDF output length in bytes.
`byte[]`	`getSalt()`	Gets the salt.
`byte[]`	`getSecret()`	Gets the secret value for the key derivation function.

- Method Detail
  - getAlgorithm
```
byte getAlgorithm()
```
    Returns the HMAC Algorithm associated with the derivation function.
    
    Returns:
    
    the HMAC algorithm associated with the derivation function
    
    See Also:
    
    Signature.ALG_HMAC_SHA1, Signature.ALG_HMAC_SHA_256
  - getSecret
```
byte[] getSecret()
```
    Gets the secret value for the key derivation function.
    It may be an array view.
    
    Returns:
    
    the secret value
  - getInfo
```
byte[] getInfo()
```
    Gets the info.
    It may be an array view. It may be null.
    
    Returns:
    
    the salt
  - getSalt
```
byte[] getSalt()
```
    Gets the salt.
    It may be an array view. It may be null.
    
    Returns:
    
    the salt
  - getOutputLength
```
short getOutputLength()
```
    Returns the KDF output length in bytes. It specifies the total length of data that can be generated using subsequent calls to DerivationFunction.nextBytes(byte[], short, short) or DerivationFunction.nextBytes(javacard.security.SecretKey).
    
    Returns:
    
    the output length