HMacSha ("Entrust Authority Security Toolkit for the Java Platform")

java.lang.Object
- javax.crypto.MacSpi
- - iaik.security.mac.HMac
  - - iaik.security.mac.HMacSha

Deprecated.
since 7.0; use Sha1HMac instead
```
public class HMacSha
extends HMac
```
This class implements the HMAC(Keyed-Hashing for Message Authentication) algorithm as defined in RFC 2104 with Secure Hash Algorithm as message digest algorithm.
This class only instantiates the super HMac class and specifies SHA as hash algorithm to be used.
An application wishing to perform a MAC computation, at first has to create a MAC object by instantiating the MAC class through a proper getInstance factory method thereby specifying the MAC algorithm to be used. Calculating a HMAC based on the Sha hash algorithm, may be initiated as follows:
```
 MAC sha_HMAC = MAC.getInstance("HMAC/SHA");
 
```
After properly initializing the MAC object with one entity's secret key, the data to be processed is applied by one (or more) calls to the update methods. The MAC computation is concluded by using doFinal. If the data can be processed without calling any update method, doFinal can be called immediately after initializing the MAC object:
```
 sha_HMAC.init(secret_key);
 byte[] mac_data = sha_HMAC.doFinal(data);
 
```
After the MAC finally has been calculated, the MAC object automatically is reset for being able to be used for further MAC computations, either by using the same secret key again, or using a new key by properly re-initializing this MAC object.
See Also:
HMac, HMacMd5

Constructors
Constructor and Description
`HMacSha()` Deprecated. Default constructor.

Class HMacSha